The original purpose of the reservoir was for flood control on the White River. The dam had been authorized a month earlier under the Flood Control Act of September 3, 1943. The reservoir has a fluctuation of. When the reservoir is above the maximum flood pool, excess water goes over the auxiliary overflow spillway at the north end of the dam. Table Rock Dam’s spillway capacity was evaluated as a result of a dam safety program in the 1990s. Using improved weather data and more modern technology and safety requirements, engineers determined that the lake would rise ten feet higher during the worst-case flood than previously calculated. An event of this magnitude would overtop the earthen embankment and destroy Table Rock Dam with catastrophic losses in downstream areas, including Branson. To prevent the potential loss of life and property damages, Congress approved and authorized construction of the Dam Safety Project. After considering several options and gathering considerable public input, an auxiliary spillway was determined to be the best solution. The auxiliary spillway was completed in 2005 at a cost of approximately $65,000,000. At elevation 931 Table Rock Lake is at full flood capacity or flood pool. Water may begin to splash over the top of the closed Tainter gates and some of them usually begin to be slightly opened to accommodate additional lake inflow from the White River Basin including the James River and Beaver Lake discharge. If the Tainter Gates are not opened to release water via the dam spillway, water from the lake will begin to spill over those closed gates by approximately 933 feet. At elevation 937 Table Rock Lake is 6 feet above flood capacity. All ten Tainter gates are opened wider in an effort to stabilize reservoir rise. Outflow from the Lake under these circumstances will be nearing 200-300 thousand cubic feet per second. At elevation 942 Table Rock Lake is 11 feet above flood capacity and at its "design pool", or the maximum elevation that the reservoir is engineered to reach, under "probable maximum flood" scenarios. The dam’s ten Tainter gates will be fully raised to their maximum height of approximately 30 feet, releasing 550 thousand CFS into Lake Taneycomo. This scenario would effectively submerge and destroy the powerhouse, power transmission grid, hatchery, and wreak serious destruction downstream. At elevation 947 Table Rock Dam would be at its maximum capacity and water would be at the very top of the dam. The auxiliary spillway would be brought online, in concert with Table Rock’s fully opened floodgates. This catastrophic or "last resort" protocol releases 1 million CFS of lake waters into Taneycomo and deals dreadful destruction to Branson, Hollister, Point Lookout and possibly the Powersite Dam. At this point there is a danger of water overtopping the concrete dam and breaching the earthen structure, which imminently leads to cataclysmic structural failure and the uncontrolled release of the Table Rock Lake impoundment—nearly 3 million CFS of water. Table Rock Lake has a record crest of 935.47 feet, which occurred on April 27, 2011. In December 2015, the dam released 72,000 CFS at its peak. This is the highest amount ever released.
Facilities and State Park
provides public access to the lake. Six miles from Branson and located just south of the dam and outlet, facilities include a boat launch and full service marina, campground, fishing access, swimming access, picnic area, amphitheater, hiking and mountain bike trails, and dump station. Area71 is a recreational vehicle resort, restaurant, and general store on Table Rock Lake in Shell Knob, Missouri. The store and restaurant were completely rebuilt in 2016 with an expanded menu and bait shop. The RV park features views of Table Rock Lake with long term site rental agreements.
