Rollins Pass


Rollins Pass, elevation, is a mountain pass and active archaeological site in the Southern Rocky Mountains of north-central Colorado in the United States. The pass is located on and traverses the Continental Divide of the Americas at the crest of the Front Range southwest of Boulder and is located approximately five miles east and opposite the resort in Winter Park—in the general area between Winter Park and Rollinsville. Rollins Pass is at the boundaries of Boulder, Gilpin, and Grand counties. Over the past 10,000 years, the pass provided a route over the Continental Divide between the Atlantic Ocean watershed of South Boulder Creek with the Pacific Ocean watershed of the Fraser River, a tributary of the Colorado River.
The abandoned rail route over Rollins Pass was nominated for and accepted into the National Register of Historic Places in 1980 because of significant events and engineering feats accomplished by railroading efforts in the early 20th century. In 1997, additional areas on the pass were added to the National Register of Historic Places to include achievements made by John Q.A. Rollins and his toll wagon road that traversed the pass.
In 2012, Rollins Pass was listed as one of the most endangered sites in Colorado.

Naming

Rollins Pass is the sole, official name recognized by both the United States Geological Survey and the United States Board on Geographic Names ; a decision card was issued on Wednesday, December 7, 1904. The pass was first known as Boulder Pass—one of two variant names accepted by the BGN—the other being Rogers Pass. The pass was also known infrequently as Rollinsville Pass.
In Grand County, Rollins Pass is sometimes given the sobriquet of Corona Pass, named for the apex station at the summit, Corona. This nomenclature dispute provoked the ire of former railroaders; in fact, Frederick Bauer remarked, " incorrectly called Corona Pass by neophytes and some locals." It is inconsistent, as well as atypical, to refer to mountain passes by the names of their apex stations. Fremont Pass, for example, is not named Climax Pass; nor is La Veta Pass referred to as Fir Pass.

Elevation

The elevation of '11,660 feet' commonly attributed to Rollins Pass "reflects what might have been an original survey value obtained during either the late wagon road era or early railroad construction.... The actual benchmarked survey elevation value of the summit of Rollins Pass is 11,671 feet, obtained during a 1952 second-order level line run from State Bridge to Denver by the US Coast and Geodetic Survey. When adjusted to NAVD88, the elevation is, without doubt, 11,676.79 feet."

Description

Rollins Pass has been in continuous use for millennia: first as an internationally significant game drive complex that was hand-constructed and used by Paleoindians more than 10,000 years ago through the mid-19th century; followed by nearly two decades as a wagon road from 1862–1880; as a rail route from 1880 to 1928; as a primitive automobile road from 1936 to 1956; and for the past years—from 1956 through present day—as a motor vehicle road.
The pass is traversed by Paleoindians and Native American game drive complexes, hiking trails, including the Continental Divide Trail; an airway radial, a 10" Xcel Energy high-pressure natural gas pipeline, and two roads:
The Front Range was created by the Laramide Orogeny, the last of three major mountain-building events, which occurred between 70 and 40 million years ago. Tectonic activity during the Cenozoic Era changed the Ancestral Rocky Mountains via block uplift, eventually forming the Rocky Mountains as they exist today. The geologic make-up of Rollins Pass and the surrounding areas were also affected by deformation and erosion during the Cenozoic Era. Many sedimentary rocks from the Paleozoic and Mesozoic eras exist in the basins surrounding the pass.

History

Rollins Pass as a prehistoric Paleoindian & Native American hunting complex

Paleoindians and early Native Americans were the first to utilize Rollins Pass as a natural, low crossing over the Continental Divide for the purposes of communal hunting of large game, including bighorn sheep and elk. There are more than 96 documented game drives, including the Olson game drive, found largely above timberline and near the summits of multiple mountain ridges. Handmade rock walls drove prey toward hunters waiting in blinds. These unique high-altitude constructs were built, refined, and continually used over millennia. Currently the game drives are being studied by Colorado State University archaeology graduate and PhD students led by Jason M. LaBelle, PhD, the associate professor in the Department of Anthropology at the Center for Mountain and Plains Archaeology in Fort Collins, Colorado. The game drives built on—and over—Rollins Pass have international significance.

The Olson game drive

The Olson site is a multi-component rock walled game drive and is but one part of a much larger game drive complex located on Rollins Pass. Byron Olson and James Benedict conducted work at the site in the late-1960s. Present-day archaeology teams built on Olson and Benedict's work to expand the overview of the site using modern techniques. As of 2013, at least 45 blinds as well as 1,307 meters of rock walls are present across the Olson site; the purposes of which were to funnel game upslope to waiting hunters. Both radiocarbon and lichenometric dating suggest occupation by Native Americans spanning the last 3,200 years, with diagnostic tools suggesting even older use of the site, dating back to more than 10,000 years ago.

Other significant game drives

Game drives at other locations on Rollins Pass yield hundreds of additional blinds and miles of rock walls.

Rollins Pass as a late-prehistoric and historic Native American route

Rollins Pass has a documented history as a migratory route, hunting trail, and battlefield among the late prehistoric and contact-period Indians of Colorado.

Rollins Pass as an historic wagon road

The first recorded use of the pass by a wagon train was in 1862, nearly 14 years before Colorado became a state. Directions for wagons traveling from Rollinsville to Winter Park were published in newspapers. John Quincy Adams Rollins, a Colorado pioneer from a family of pioneers, constructed a toll wagon road over the pass in the 1873, providing a route between the Colorado Front Range and Middle Park; subsequently, Rollins Pass was named after John Q.A. Rollins.

John Quincy Adams Rollins

John Q.A. Rollins was born on Sunday, June 16, 1816 in Gilmanton, New Hampshire and was the son of a New England minister. Rollins is described as being a strong man and an extensive character, popular with almost everybody whom he did not owe and his one predominating fault was his failure to pay his debts. Newspapers cited that he was so careless about his credit that he could not keep track of all his creditors, and in turn, they had trouble keeping track of him. Rollins died on Wednesday, June 20, 1894 and is buried in Colorado's oldest operating cemetery, Riverside, in block 5, lot 12. His simple tombstone reads, "John Q.A. Rollins | Colorado Pioneer of Rollinsville and Rollins Pass." Colonel Rollins' newspaper obituary mentions, "No man in Northern Colorado was better known nor counted more warm friends than John Q.A. Rollins."

Middle Park and South Boulder Wagon Road Company

John Rollins capitalized on this and received approval for his toll wagon road on Tuesday, February 6, 1866. The Council and House of Representatives of Colorado Territory passed an act signed by the governor approving the wagon road as the "Middle Park and South Boulder Wagon Road Company." Records reflect the incorporators as "John Q.A. Rollins, Perley Dodge, Frederic C. Weir." Yet, the "Rollins road" through Boulder Pass was not completed until the first half of August 1873. While the newspaper articles cited "wagons can now be taken over this route without the slightest trouble," other articles countered, "the trail... is splendid for horses but fearful for wagons" and "the rocks, mud-holes, bogs, creeks, boulders and sidling ledges of that road, can only be appreciated by being seen, the only wonder is that a wagon can be taken over at all." Other articles were a bit more grim, referring to the wagon road as a "little more than the rocky ridge of a precipice along which lurked death and disaster." Newspaper records reflect on Friday, June 12, 1874, James Harvey Crawford along with his wife, Margaret Emerine Bourn Crawford, made pioneer history as the first couple to cross Rollins Pass by wagons, and Mrs. Crawford is credited as the first woman to cross the pass. That day held many challenges, including a two-hour blizzard, "which was of terrific violence" and she remarked in a newspaper article, "the bumping was so hard I thought I was nearly dead." As there was no formal road constructed from "Yankee Doodle Camp on up, only an Indian trail, she and the children had been left behind while her husband took the wagon pulled by a pair of mules, a team of horses and a yoke of oxen on up and camped. Then he came back for her with the team and the running gear only of the wagon, and she had to hold the children on someway, despite the dreadful bumping" with the "wagon almost standing on end."
The pass was used heavily in the latter half of the 19th century by settlers and at one time as many as 12,000 cattle at a time were driven over the pass. The wagon road had one tollgate and the following rate structure: "For each vehicle drawn by two animals, two dollars and fifty cents; for each additional two animals, twenty-five cents; each vehicle drawn by one animal, one dollar and fifty cents; horse and rider and pack animals, twenty-five cents; loose stock, five cents per head... horse with rider, or pack animal with pack, ten cents." The cost for nonpayment of a toll was the same as causing intentional damage to the road: $25.
According to the manuscript of Martin Parsons, "Twistin Dogies Tails Over Rollins Pass", each summer, Mr. Rollins would "build a cribbing of logs... and would fill the center with rocks and earth, which helped reduce the grade between the hills." The original log cribbing can be seen today on the narrow ridge of Guinn Mountain, north of Yankee Doodle Lake. Rollins also built The Junction House, "a large, two-story hewd-log structure" as a hotel, "at the point of intersection of the Berthoud and Rollins roads."
The road began to fall out of use and into disrepair in 1880, approximately one year before early railroading attempts over the pass begun.

Mining efforts on Guinn Mountain at Yankee Doodle Lake

Guinn Mountain, encircling Yankee Doodle Lake, was used for mining from the early 1870s through the establishment of the railroad in 1904.
This area held at least "four silver lodes" or "five patented lode claims, one patented placer claim, several prospect pits and the dump of one caved adit." This caved adit, once 365-feet-long, then lengthened to 850-feet, is still shown as a mine on United States Geological Survey topographic maps as the Blue Stones Mine. This tunnel exposed a "five-foot vein of ore varying in values from $16 to $25 per ton."
It was concluded that the "Guinn Mountain area has little or no economic potential," despite listings of important mineral strikes in period newspapers. Further, "ten samples collected in the area contained only negligible amounts of any metal. Samples from the Avalon placer claim, located on the South Fork Middle Boulder Creek north of Guinn Mountain, and from the creek bottom were collected and panned; no gold was found." Despite this record, gold claims were nevertheless worked nearby with no published record of success.

Rollins Pass as an historic railroad route

Early railroad endeavors

There were multiple prior efforts to build a railroad over Rollins Pass in the 19th century and all attempts were met with impassable engineering challenges, financing issues, or both: GHS, Jefferson, & Boulder County Railroad and Wagon Road in 1867; U.P. in 1866; Kansas Pacific in 1869; Colorado Railroad in 1884—two tunnels located; Denver, Utah & Pacific in 1881. The remains of the latter tunneling attempt can still be seen on the northern slope of the rock wall at Yankee Doodle Lake and the detritus from the attempted excavation of the tunnel was placed at the northernmost part of the lake where pulverized granite tailings can be seen rising out of the water. These tailings were definitively from the 1880s tunneling efforts as they are not visible in the early stereoscopic images from the wagon road era of Yankee Doodle Lake; further, the attempted tunnel was not part of the later rail line that ultimately summited Rollins Pass.

The Moffat Road over Rollins Pass

In the early 20th century, David Moffat, a Denver banker, established the Denver, Northwestern and Pacific Railway with the intention of building a railroad from Denver toward Salt Lake City, Utah by way of a tunnel under the Continental Divide. Surveys began in April 1902 and construction was started in January 1903, beginning on the east side of Rollins Pass. However, the railway only reached Craig, Colorado. This entire line from Denver to Craig was known as the Moffat Road.
The line included a 23-mile stretch over the top of the Continental Divide, at Rollins Pass, with a two to four percent grade and switchbacks along many sections; the result was one of the highest adhesion standard-gauge railroads ever constructed in North America. This corridor over Rollins Pass was always intended to be temporary until what would later become the Moffat Tunnel was constructed and opened; therefore this overmountain route was constructed with more cost-effective materials: using wooden trestles instead of iron bridges or high fills and wyes instead of turntables. Construction of this route was exceptionally dangerous and deadly: in a single day, 60 Swedish workers were killed when a powder charge exploded prematurely during the construction of Needle's Eye Tunnel.
Along this route were three tunnels: Tunnel #31, Tunnel #32, and Tunnel #33. All three tunnels today are either completely caved in or have had multiple partial cave-ins. Other notable landmarks on the route included the Riflesight Notch Loop, located at Spruce Mountain: a 1.5 mile spiral or loop where trains crossed over a trestle, made a ~90 degree gradual turn to descend 150 feet, and passed through Tunnel #33 underneath the trestle.
A rail station, Corona, was established at the summit of the pass, with a red brick dining hall, weather station, power station, and lodging. In summers, the train ride from Denver to Corona was advertised as a trip, "from sultry heat to Colorado's north pole;" tourists could stand in snowdrifts in the middle of July or August. Tours launched from the Moffat Depot, a small building constructed in the Georgian Revival style, featuring two-story tall windows, intricate exterior brickwork, and roofline pommels. This building, located several city blocks northwest from Denver Union Station, was added to the National Register of Historic Places in 1976, and lay dormant for many decades after it was shuttered in 1947; in 2015, it was made the focal point of a senior living community center, after it was meticulously restored.

Weather and operational difficulties

Despite the fact that the line was enclosed in almost continuous snowsheds near the summit of the pass, trains were often stranded for several days during heavy snowstorms because snow could fall or be blown through the wood planking of the sheds. Delays affected the timeliness of both newspaper and postal mail deliveries. Coal smoke and toxic gasses collected in the snowsheds causing temporary blindness, loss of consciousness, and sometimes death. Workers on the Moffat Road had an adage: "There's winter and then there's August." It was these heavy snowstorms that led to the financial demise of the Moffat Road and served as the incentive for construction of a permanent railroad tunnel through the Rocky Mountains and into Middle Park.
Following scuba dives, no evidence exists that locomotive, rotary, or wreck debris rests at the bottom of Yankee Doodle Lake or Jenny Lake. However, many derailments, wrecks of Mallet locomotives, accidents resulting in injury and/or death, and/or the loss of portions of rail manifests occurred on both sides of the pass:
NumberSide of Rollins PassSpecific locationEquipment involvedCrew deathsPassenger deathsCrew injuriesPassenger injuriesDateCauseICC Report Number
#1WestThe Looptender–N/A––January or February 1909derailment–
#2Unknownunknownrotary–N/A––April 1909derailment–
#3Easton a curve just above AntelopeMallet No. 201, 10 coal cars, and caboose4N/A1–January 1910brake failure–
#4Westfour miles west of Coronatwo engines–N/A––July 1910rockslide causing a culvert to sink causing a derailment–
#5Easteast of Coronafreight engine–N/A––September 1911derailment–
#6WestThe Looprunaway train, stopped before derailment–N/A1–January or February 1912runaway train–
#7East"near Corona"three freight cars–N/A––April 1912derailment–
#8Westunknownengine–N/A––January 1913unknown–
#9Eastunknownrotary–N/A––February 1913derailment–
#10Eastnear Jenny Lakerotary–N/A––March 1913derailment–
#11Eastnear Jenny Lakerotary and several cars–N/A––March 1913avalanche–
#12EastDixie sidingbox car with stuck brake1N/A––November 1913fall–
#13EastBogen sheds near Jenny Lakerotary1N/A2–January 1915brake failure–
#14WestRanch Creek Wyefreight train–N/A––December 1915derailment–
#15WestOld Camp Six12 loaded coal cars, Mallet helper, caboose0N/A0–January 1917brake failure–
#16WestArrowEngine 120 and the caboose from the rollback, above0N/A0–January 1917brake failure–
#17WestRanch Creek Wyepassenger train and rotary collision–N/A2+1 April 1917damaged rail leading to a collision–
#18EastSprucefreight train extra 118 and multiple coal cars1N/A3–April 1917brake failure427
#19Eastinside Needle's Eye Tunnelfreight train0N/A0–October 1917derailment–
#20EastYankee Doodle Lake, east of "Mount Corona"rotary and engine3N/A5–December 1917avalanche–
#21SummitCoronarotary3N/A––February or March 1918unknown–
#22EastSprucerotary–N/A––March 1918derailment–
#23EastLadorafreight train–N/A––June 1918derailment–
#24Westsnowsheds at Coronafreight train0N/A0–October 1918derailment–
#25WestIrving Spurfreight train–N/A––October 1918derailment–
#26Eastbetween Needle's Eye Tunnel and Jenny Lakelocomotive No. 1002N/A1–January 1919boiler explosion–
#27Eastnear Jenny Lakefreight train–N/A––January 1919derailment–
#28Eastnear Jenny Lakefreight train–N/A––April 1919derailment–
#29Eastnear Jenny Lakefour freight cars and the engine's tender–N/A––December 1919avalanche–
#30Eastnear Jenny Lakeengine–N/A––April 1920derailment due to ice–
#31Eastnear Jenny Lakerotary–N/A––May 1920derailment–
#32Eastunknownwooden gondola railcar0N/A0–1913–1929derailmentN/A
#33EastNeedle's Eye Tunnelrotary0N/A0–April 1921derailmentN/A
#34WestRiflesight Notch LoopMallet No. 208 and tender4N/A2–February 1922avalanche–
#35EastAntelopetwo engines and 10–23 coal cars2N/A––December 1922brake failure and fatigue915
#36Eastinside Needle's Eye Tunnelfreight engine–N/A––December 1922derailment–
#37WestRanch Creek Wyetwo coaches–N/A––July 1923derailment–
#38Eastnear Jenny Lakefreight–N/A––August 1923derailment–
#39WestRiflesight Notch LoopMallet No. 210–N/A––1924derailment–
#40Westsnowsheds at Coronapassenger train No. 2 and caboose0N/A0–October 1925fire–

Despite the challenges documented above, by 1918, it was reported that 45 or 46 engines were part of the motive power of the railroad along with 3 rotary snowplows.

The Moffat Tunnel

Several locations for the Moffat Tunnel were scouted prior to the selection of the present-day location; one possible location was identified at high altitude between Yankee Doodle Lake and the Forest Lakes.
Plans to build a longer tunnel at a lower elevation were better planned and financed; the single-track Moffat Tunnel opened just south of Rollins Pass on Sunday, February 26, 1928. The Moffat Tunnel eliminated 10,800 degrees of curvature along the Rollins Pass route; the tunnel resulted in considerable time savings as well as money that was used for snow removal atop Rollins Pass. After the first year of operations, an annual report to stockholders showed "marked savings in operating costs" by 24.86%. Savings were seen in other areas, including in fuel reductions, engine servicing ; whereas gross tons per train hour increased by 34.84%.
After the Moffat Tunnel opened, the tracks over Rollins Pass remained in place and were maintained at least as late as July 1929 as an emergency route. This emergency route was needed only once for a several day-long closure: on Thursday, July 25, 1929, dry rot of wooden timbers caused a collapse and 75 feet of rock caved-in and blocked the Moffat Tunnel near the East Portal. It took until Tuesday, July 30, 1929 for the tunnel to be cleared of debris. Permission to dismantle the rails on Rollins Pass was granted by the Interstate Commerce Commission on Saturday, May 18, 1935 and the rails were removed the following summer: the west side was cleared by Tuesday, August 11, 1936, and the east side 14 days later; contractors toiled non-stop, including overnight to remove both the rails and ties. A wye on the passing siding at the East Portal of the Moffat Tunnel is currently utilized for short-turning some modern services and marks the spot where the Rollins Pass line, if it still existed, would have merged into the modern route.
The route through the Moffat Tunnel became part of the mainline across Colorado for the Denver and Salt Lake Railroad, later the Denver and Rio Grande Railroad, and now the Union Pacific Railroad. The Moffat Tunnel continues to be used for both the Amtrak's California Zephyr that provides service between Chicago, Illinois and Emeryville, California as well as for the winter and sometimes summer Ski Train that operated between Denver and Winter Park from 1940 to 2009; in March 2015 and from 2017–present, the service was rebranded the Winter Park Express.
The original 1922 law that authorized the construction of the Moffat Tunnel specified that it should also be used for automobile traffic, with automobiles being placed on a ferry of flatbed railcars. To date, this has not happened.
The pioneer bore used to originally construct the Moffat Tunnel was later converted into the Moffat Water Tunnel by Denver Water.

Rollins Pass as an air route and navigational [waypoint]

In the era of powered flight, Rollins Pass provides an attractive way to cross the Continental Divide between west and east at a relatively low point for aircraft. Not only does the enroute airway radial, Victor Eight, cross the pass; but also a rotating airway beacon was established in the mid-to-late 1940s and first appeared on aeronautical sectional charts in March 1948 as a star, indicating a beacon. The beacon and its supporting infrastructure have since been removed due to the introduction of the Low-Frequency Radio Range systems to replace visual navigational aids. The rough road that was once used to service and reach Beacon Peak at the Continental Divide, branches off of the Rollins Pass road, and is closed to all forms of motorized traffic per the current Motor Vehicle Use Maps.

Rollins Pass as an historic automobile road

Plans to convert Rollins Pass into an historic automobile road were first published in November 1949. Several years later, on Saturday, September 1, 1956, Colorado lieutenant governor, Steve McNichols, opened Rollins Pass as a non-vital and seasonal recreational road. Each summer, from 1956–1979, Rollins Pass served as a complete road over the mountain pass for automobiles until a substantial rock fall in Needle's Eye Tunnel in 1979 closed the path over the pass. In 1989, after several engineering studies and structural strengthening of Needle's Eye Tunnel were accomplished, the complete road was re-opened only to close permanently in 1990, due to a rockfall injuring a sightseer. For the past years—since July 1990—no motorized route connects across the Continental Divide, effectively making each side a dead-end uphill route that must be traveled again, downhill, to leave the pass.

Rollins Pass as a natural gas pipeline route

In 1969, a natural gas pipeline was placed on Rollins Pass. In the mid-1990s, Rollins Pass was closed for the installation of a 10-inch diameter Xcel Energy high-pressure natural gas pipeline. The pipeline, not always under marker, still is in existence and uses the low pass to reach the Front Range by loosely following County Road 8 in Fraser, utilizing much of Ranch Creek towards the Middle Fork of Ranch Creek below Mount Epworth, climbing the pass near Ptarmigan Point, and following much of the old railbed past Corona at the summit of Rollins Pass. The pipeline continues across the railbed towards and under the twin trestles, down the old wagon route on the spine of Guinn Mountain, and then towards Eldora. The pipeline undergoes internal inspections "at least" every seven years with the deployment of a smart pig inside the pipeline.

Artifacts and features

Preservation of both prehistoric and historic records

A majority of Rollins Pass is located within the boundaries of two national forests—Roosevelt National Forest and Arapaho National Forest—and as such, is federal land. The Archaeological Resources Protection Act along with the Antiquities Act, among other federal and cultural laws, recognizes the nonrenewable and vulnerable nature of cultural resources and these laws protect and make it illegal to collect artifacts, including but not limited to: arrowheads, horseshoes, buttons, cans, glass or ceramic bottles, dishware and utensils, coal, railroad spikes, snowshed wood, railroad ties, and telegraph poles from Rollins Pass. All artifacts—from the prehistoric to the historic—on the pass are objects of antiquity and are being studied and documented by universities and government agencies. The material record of Rollins Pass is illegally carried away each year in the backpacks of well-intentioned visitors who want a souvenir; but once artifacts are removed, a place can never again reveal the mysteries of the past. Each artifact has important scientific and cultural value and theft harms the historical record. Visitors are encouraged to preserve the area for future generations by leaving items in place and sharing photographs and GPS coordinates with researchers dedicated to telling the story of Rollins Pass and an internet resource has been setup to aid with this project.

Enforcement

County sheriffs as well as United States Forest Service Law Enforcement personnel and staff routinely patrol and enforce natural and cultural resources on Rollins Pass as well as in other areas within the National Forest System.

Artifacts affecting the road prism

On both sides of Rollins Pass, the road prism contains both prehistoric and historic artifacts buried under the surface. Any improvements to the rough road through regrading, including paving, would first require extensive sectional archaeological excavations by the United States Forest Service. In several places, on or just under the surface, historical artifacts are covered with geotextile stabilization fabrics having characteristics that match the soil and permeability of the existing roadbed.

Drystacks

There are several drystack retaining walls on both sides of the pass, built without mortar, helping ensure they retain soil but not water.

Ghost towns, settlements, and gravesites

There are several ghost towns on or near Rollins Pass, the most notable being Arrow, Corona, Ladora, the East Portal construction camp, Mammoth, and Tolland. There are also at least a half-dozen other established settlements, dating back to both the wagon road and railroad eras, scattered across Rollins Pass.
There are also several historic gravesites across Rollins Pass. One granite headstone at Arrow reads, "R.M. Smith | June 28, 1842 | Nov. 12, 1909." One marker near the Eldora Ski Area states that it holds two members of John C. Frémont's third expedition in 1845–1846, although this is disputed.

Environment

Leave No Trace

Rollins Pass has unique floral, faunal, and riparian zones that spread across multiple Colorado counties; to best preserve the native environment of Rollins Pass, leave no trace and trail ethics apply to all visitors. Trundling is discouraged for safety and environmental concerns as well as to preserve artifacts.

Flora

Rollins Pass consists of several distinct floral environments including lodgepole pine and quaking aspen at lower elevations, and krummholz at tree line. Above tree line, the landscape consists largely of small perennial wildflowers, cryptobiotic soils, and alpine tundra. The latter being extremely fragile and if damaged, can take 100–500 years to recover. Leaving the trail can cause erosion, land degradation, possible species extinction, and habitat destruction and it is for these reasons vehicles, including off-road vehicles, are not allowed to leave the established road. There are at least two marked revegetation areas on Rollins Pass: one at Yankee Doodle Lake; the other at the summit leading to the historic dining hall foundation.

Pine beetle epidemic

The mountain pine beetle epidemic, beginning in 1996 and continuing through present day, affects many forested areas in Colorado, including those on Rollins Pass. One out of every 14 trees in Colorado is dead. Trees affected by the beetles contain 10 times less water than a healthy tree and crown fires can quickly spread.

Fauna

The top predator in the area are black bears, generally below timberline; however, they occasionally venture above the krummholz. The bears prey on bighorn sheep and mountain goats, as well as yellow-bellied marmot in the region. Above timberline, pikas are common. At or below timberline, both elk and mule deer are common. The presence of migratory bighorn sheep and other large game is the reason why Native Americans constructed sprawling yet intricate game drive complexes on Rollins Pass.
The porcupine can be seen at all elevations on Rollins Pass, including at the summit. The porcupine begins its rounds at sunset, as it is nocturnal; this member of the rodent family also has the ability to adroitly climb trees.
Among birds, the white-tailed ptarmigan are present on Rollins Pass, especially above treeline. Their seasonal camouflage is effective in the summer against the exposed blocks of granite as well as against snow in the winter, rendering them virtually undetectable. Brown-capped rosy finches, rock wrens, and pipits are also seen or heard at timberline and near the summit.

Riparian zones

Nutrient-rich ecosystems exist on Rollins Pass where water, and bodies of water, meet the alpine and subalpine tundras.

Lakes

There are three lakes on the west side of Rollins Pass: Deadman's Lake, Pumphouse Lake, and Corona Lake. On the east side of Rollins Pass are King Lake, Yankee Doodle Lake, and Jenny Lake. Historically, Yankee Doodle Lake was referred to as Lake Jennie by John Quincy Adams Rollins, but modern archaeologists have re-interpreted this to be the modern day Yankee Doodle Lake; the railroad and period newspapers occasionally referred to this lake as Dixie Lake. Also in the vicinity: Bob Lake, Betty Lake, the Forest Lakes, Skyscraper Reservoir, Lost Lake, and Woodland Lake.
In 2010, Pumphouse Lake and Ranch Creek were assessed by the Environmental Protection Agency and were determined to be polluted.

Creeks and rivers

On the west side, in addition to the Fraser River at the start of Rollins Pass are the following creeks: the South Fork of Ranch Creek, the Middle Fork of Ranch Creek, and Ranch Creek. On the east side of Rollins Pass, the South Fork of the Middle Boulder Creek is fed by Bob and Betty Lakes and Jenny Creek is fed by both Jenny and Yankee Doodle Lakes; further downstream, Antelope Creek feeds into Jenny Creek. The South Boulder Creek runs at the start of Rollins Pass on the eastern side; but first flows through Buttermilk Falls, a large 550-foot-long waterfall, near King Lake, visible from the summit and upper eastern portions of Rollins Pass.

Improvements

A summer 2006 project led by the United States Forest Service and having the participation of both environmental and user groups saw improvements made to wetlands, lakeshore, and upland habitats at Yankee Doodle Lake and Jenny Creek. Fencing was installed to restrict vehicle travel to designated routes and improve degraded areas. Before work could begin, sectional excavations by archaeologists took place to document the wagon road era settlements of the "Town of Yankee Doodle at Lake Jennie," located at present day Yankee Doodle Lake.

Wildfires

In the summers, wildfire danger increases due to various environmental factors: low moisture, lightning strikes, high winds, and human-caused factors. As the pass is a recreational area, wildfires can also be caused by unmanaged, unattended, and/or uncontrolled campfires.

Fire restrictions

At present, fire restrictions apply to the areas comprising Rollins Pass. Typically, these protective restrictions tend to be enacted starting as early as mid-late July or later in August:
Boulder CountyGilpin CountyGrand County
Stage 2Stage 2Stage 1 on USFS lands

Nature caused

Seasons

Winter

Arctic conditions are prevalent during the winter, with sudden blizzards, high winds, and deep snowpack. High country overnight trips require gear suitable for −35° Fahrenheit or below. The subalpine region does not begin to experience spring-like conditions until June. Wildflowers bloom from late June to early August.

Summer

Due to high-elevation above timberline in a backcountry setting, there is neither lightning protection nor lightning mitigation from sudden thunderstorms resulting in a high-risk, extremely dangerous situation for visitors. The most suitable—but not best—refuge available from electrical storms would be in a metal-topped vehicle as it would serve as a mobile Faraday cage.

Weather equipment and historical records

Historical

During the railroad era, a United States Weather Bureau observation station was mounted atop the large water tank at the townsite of Corona. Records from this station show "the prevailing wind direction was west, the lowest temperature recorded was −30° Fahrenheit, and the most monthly snowfall was in March 1912 with 72.5 inches of snow." Newspaper reports mention winds in excess of 60 MPH, including at least one instance of 84 MPH, and temperatures of −44° Fahrenheit.

Present day

A small, solar-powered weather station exists on the west side of Rollins Pass, located above Ptarmigan Point.

Atmospheric pressure

While temperature, humidity, and other factors influence atmospheric pressure, the atmospheric pressure on the summit measures roughly 457 Torr ; while a standard atmospheric pressure measured at sea level is 760 Torr. At this pressure, many people, especially out-of-town visitors from lower elevations, can suffer from rapid dehydration and altitude sickness, also known as acute mountain sickness. Acute mountain sickness can progress to high-altitude pulmonary edema or high-altitude cerebral edema, both of which are potentially fatal.
Historically, newspaper reports wrote of both visitors and railroad workers experiencing heart attacks and pneumonia at the summit of Rollins Pass as well as severe frostbite, including in July.

Avalanches

Human-triggered and natural avalanches are possible anywhere on the pass and there have been three notable avalanches—all at Yankee Doodle Lake—on Rollins Pass:

Railroad era

Backcountry skiers, snowshoers, and snowmobilers are advised to check daily avalanche forecasts, practice diligent terrain management, and always carry and know how to use rescue gear, including Emergency Position-Indicating Radio Beacons.
On Wednesday, November 28, 2001, two highly-experienced backcountry skiers triggered a sizable hard-slab avalanche. From the accident report, "The avalanche released from a southeast-facing slope and fell 600 vertical feet and stopped by crashing through the 10-inch thick ice of Yankee Doodle Lake. The displaced water resulted in a surge 10–12 feet tall along the south shore." The avalanche pushed both men into the lake and one survivor was sent 190 feet into the center of the lake. The survivor, suffering from hypothermia and frostbite, hiked to five miles to the Eldora Mountain Resort where he sought help. The search involved ground crews, air crews, avalanche rescue dogs, and trained dive-rescuers with specialized rubber suits. The body of the second skier was found 91 feet offshore. Both skiers were well-equipped, including having avalanche transceivers. Following the accident, each year in December, the Rocky Mountain Rescue Group holds a Joe Despres Memorial Dry Land Transceiver Training to include practices for using transceivers, along with avalanche courses, fundraising, and backcountry seminars.

Access

General information and seasonal recreation

Rollins Pass is managed by the United States Forest Service as a recreational location and can be accessed from roads on both west and east sides; however, no motorized route connects across the Continental Divide. The entire road is unpaved, has no guardrails, and has a speed limit of 20 MPH. Current-year Motor Vehicle Use Maps should be reviewed to determine which trails and roads are open to vehicles. Violators are subject to fines up to $5,000—"regardless of the presence or absence of signs" and operating a vehicle in wilderness areas is prohibited. Buck and rail fences have been placed at select areas on the pass to indicate routes or areas closed to motor vehicles.
There are no facilities, shops, restrooms, call boxes, water fountains, trash receptacles, nor shelters located on either side of the pass. The only exception is the Årestua Hut, located on the northern side of Guinn Mountain at 11,000 feet on the east side of Rollins Pass. The small hut was constructed years ago and is open year-round. A series of hand-constructed stone windbreaks exist above timberline north of Needle's Eye Tunnel—these structures date to the railroad era on Rollins Pass and are not prehistoric. These windbreaks currently lack upper coverings or roofs and serve only as aerodynamic dampeners for wind and wind gusts.

Winter

Both sides of the pass can be traveled by snowmobile when at least six inches of snow cover the road in the winter—generally beginning in late November or early December and lasting through early April.

Spring

Both sides of the pass are closed in spring—including several weeks in June—to any form of motorized traffic: snowmobiles, automobiles, ORVs, ATVs, or motorcycles for the prevention of road damage.

Summer and early autumn

Both sides of the pass can be traveled—in good weather—by motorized vehicles in the summer and early autumn. Rollins Pass is scheduled open for vehicular summer traffic from June 15 through November 15; however, it is generally not possible given typical snowfall accumulations and slower melt rates in southerly-shaded areas, to drive higher than Sunnyside or Ptarmigan Point on the western side, or Yankee Doodle Lake on the eastern side before early-to-mid July. In 2019, and in other summers when the prior season's snowfall has been late and/or considerable, mid-elevation gates on the west side of Rollins Pass remained closed on June 15 due to an order, "Extended closure due to snow, runoff, and road damage 36 CFR 261.54a."
The first high-country snowstorms bring fierce winds and create impassible snow drifts that are not plowed; this effectively puts higher landmarks—including the summit—out of reach as soon as late September or early October. On average, the near-annual existence of snow at or above timberline, ensures the road is only passable less than 90 days per year.
Summer usage of the pass is currently classified as 'heavy' by the United States Forest Service; as such, parking can be very limited at designated parking sites. While the route mostly has gentle grades with switchbacks between two and four percent and does not contain loose gravel, four-wheel drive higher-clearance vehicles fare better than two-wheel drive vehicles, particularly in certain technical sections: some areas on the east side have up to a 17.63% grade; the west side has some areas with a 15% grade. In all narrow sections, the vehicle heading downhill must yield to the vehicle traveling uphill.

From the north or south (along the Continental Divide Trail)

The Continental Divide Trail crosses the summit of Rollins Pass from south to north; the trail bisects the former wye at Corona and takes hikers through the Indian Peaks Wilderness past the dining hall foundation at the summit.

From the east (near Rollinsville">Rollinsville, Colorado">Rollinsville & Tolland">Tolland, Colorado">Tolland)

The road up the pass on the eastern side from the Peak to Peak Highway begins at the East Portal road running west, parallel to South Boulder Creek and the current Union Pacific Railroad tracks, to the East Portal of the Moffat Tunnel, and then rises on the abandoned railroad grade from Giant's Ladder to the closed Needle's Eye Tunnel. From Rollinsville to East Portal, the road is an all-weather gravel road, with several chattery washboard sections, that can be traveled by regular automobiles. However, beginning at East Portal, at the formal start of Rollins Pass road, the road prism becomes very rough due to sustained sections of angular cobbles and potholes, the latter being several feet in size. The road has a level 2 road maintenance status described as "assigned to roads open for use by high-clearance vehicles" that includes the following attributes: "surface smoothness is not a consideration" and is "not suitable for passenger cars."
This former railroad bed is open for 11.7 miles; two miles past Jenny Lake, there is a concrete-filled steel road gate with large rocks and Jersey barriers approximately one half-mile before Needle's Eye Tunnel. A rough trail continues around either side of the tunnel for non-motorized transportation; the road is open for hiking and mountain biking beyond the barricaded portal of the tunnel toward the summit. No motorized route connects across the Continental Divide.
A majority of the lower portion of the east side of the pass is posted private property with no trespassing off either side of the road as the properties belong to or are part of a conservation easement, Tolland Ranch, LLC and the Zarlengo Family Partnership, LLP as well as smaller land segments belonging to other entities. Shortly before the Spruce Wye, the land ownership transitions to the Arapaho and Roosevelt National Forest where it remains uninterrupted up to and including the summit and surrounding areas.

From the west (near Winter Park)

The road up the pass on the western side from Winter Park starts from U.S. Highway 40 in Winter Park and has several sections of angular cobbles and potholes of varying dimensions, some several feet in size. The road has a level 2 road maintenance status described as "assigned to roads open for use by high-clearance vehicles" that includes the following attributes: "surface smoothness is not a consideration" and is "not suitable for passenger cars."
The road is open for 14.4 miles and terminates at the summit's parking area. Exactly 0.15 miles before reaching the summit, capable vehicles can turn right onto County Road 80 and continue via Forest Service Road 501.1—this rough road rises above and bypasses the summit for another 1.8 miles before dead-ending overhead Yankee Doodle Lake at Guinn Mountain. No motorized route connects across the Continental Divide.
A majority of the lower portion of the west side of the pass is private property belonging to Arrowhead Winter Park Investors, LLC and the Denver, City & County Board of Water Commissioners, known more commonly as Denver Water. Shortly after the ghost town of Arrow and several miles before what was the Ranch Creek Wye, the land ownership transitions to the Arapaho and Roosevelt National Forest where it remains uninterrupted up to and including the summit and surrounding areas.

Guided tours

Due to hairpin turns, steep terrain, and inclement weather, there have been several incidents and accidents, some fatal on or near the Rollins Pass road:

Non-motorized

The complete pass is open and accessible for snowshoeing, fatbiking, backcountry skiing, and cross-country skiing in the winter and to hikers, bicyclists, and horseback riders in the summer. For the past years—since July 1990—no motorized route connects across the Continental Divide, effectively making each side a dead-end uphill route that must be traveled again, downhill, to leave the pass.
and metal dowels were installed in August 1987 to help reduce additional rock falls and preserve the condition of the tunnel constructed in. |2018 photograph of Needle's Eye Tunnel, near the summit of Rollins Pass. This view shows the northeast portal in the foreground; the southwest portal can be seen in the background. Wire mesh and metal dowels were installed in August 1987 to help reduce additional rock falls and preserve the condition of the tunnel constructed in.

Historic wagon route

For visitors in or on motor vehicles wishing to access and retrace the historic wagon route over the pass, there are numerous closures, some permanent, and no motorized route connects over the Continental Divide at Rollins Pass:
For visitors in or on motor vehicles wishing to access and retrace the old railroad line, the majority of the railroad route or right-of-way over the pass is open and intact with several exceptions, detailed below, and no motorized route connects over the Continental Divide at Rollins Pass:
Several trails on Rollins Pass are adopted.
In 2002, the James Peak Wilderness and Protection Area Act was passed by Congress and signed into law by President George W. Bush. The act amended the Colorado Wilderness Act of 1993 and designated lands within both the Arapaho National Forest and the Roosevelt National Forest as the James Peak Wilderness area and added lands to the Indian Peaks Wilderness, establishing these lands as federally protected territory. The act contained an administrative provision:
If requested by one or more of the Colorado Counties of Grand, Gilpin, and Boulder, the Secretary shall provide technical assistance and otherwise cooperate with respect to repairing the Rollins Pass road in those counties sufficiently to allow two-wheel-drive vehicles to travel between Colorado State Highway 119 and U.S. Highway 40. If this road is repaired to such extent, the Secretary shall close the motorized roads and trails on Forest Service land indicated on the map entitled 'Rollins Pass Road Reopening: Attendant Road and Trail Closures', dated September 2001.

Historically, both Gilpin and Grand counties have requested to re-open the road; however, Gilpin County has publicly withdrawn their support and opposes re-opening the thoroughfare over the pass, along with Boulder County.
To date, only minor repairs have been made. The difficulties and expenses of making improvements to the road, including coordination of maintenance and re-introduced liabilities—coupled with intractable disputes surrounding the 1990 accident in the tunnel, have become contentious and ongoing issues; however, alternative routes utilizing the Moffat Tunnel have been proposed.

Airspace and aviation

Airspace

The entirety of Rollins Pass resides in Class G airspace. Per the FAA Pilot’s Handbook of Aeronautical Knowledge, “Although ATC has no authority or responsibility to control air traffic, pilots should remember there are visual flight rules minimums that apply to Class G airspace.”

Airway ''Victor Eight''

Rollins Pass is traversed by a low altitude enroute airway radial, Victor Eight, the width of the airway is 4 nautical miles on either side of the centerline which skirts the summit of the pass. Pilots have recommended to avoid the area in bad weather due to extreme downdrafts, mountain waves, and turbulence on the east side of the pass.

Drone operations

flights are permissible in Class G airspace on/over Rollins Pass provided all flights adhere to the FAA’s regulations for recreational or commercial drone flights. The one major restriction is that drones cannot take off from, land in, or be operated from congressionally designated wilderness areas. Remote pilots should exercise extreme caution as the enroute airway radial brings fast-moving aircraft within the area, including Flight for Life helicopters, search and rescue helicopters, and military aircraft; many of which fly below 500 AGL.

Emergency landing zone

A non-illuminated summer emergency backcountry helicopter landing zone exists at the summit, placed sometime between September 1999 and October 2005.

Rotating airway light beacon (Beacon 82)

A rotating airway light beacon, was placed very near the summit of Rollins Pass atop what was then later termed Beacon Peak, in the mid-to-late 1940s at an approximate elevation of 12,080 feet. The glass-domed lighted beacon rotated six times per minute, marking the airway between Los Angeles and Denver, and it held a two-million candlepower electric lamp with a 24-inch parabolic reflector. The beacon was removed in the late-1960s and is currently in storage at the Pioneer Village Museum in Hot Sulphur Springs, Colorado; however an 11 foot by 9 foot concrete foundation remains near the top of the peak along with the leg stubs used for the beacon's lattice tower.

Accidents and incidents

There have been many documented airplane and helicopter crashes on and near Rollins Pass:

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