List of National Natural Landmarks in Washington


There are 18 National Natural Landmarks in the U.S. state of Washington, out of nearly 600 National Natural Landmarks in the United States.
NameImageDateLocationCountyOwnershipDescription
Boulder Park and McNeil Canyon Haystack RocksDouglasFederal, stateThe most illustrative examples of glacial erratics in the United States.
Davis CanyonOkanoganState, privateOne of the largest and least disturbed examples of antelope bitterbrush-Idaho fescue shrub steppe remaining in the Columbia Plateau.
Drumheller ChannelsAdams, GrantFederal, state, privateIllustrates the dramatic modification of the Columbia Plateau volcanic terrain by late Pleistocene catastrophic glacial outburst floods. Includes Columbia National Wildlife Refuge.
Ginkgo Petrified ForestKittitasStateThousands of logs petrified in lava flows. Part of Ginkgo/Wanapum State Park.
Grand CouleeGrantFederal, state, privateAn illustration of a series of geological events.
Grande Ronde Feeder DikesAsotinPrivateThe best example of basalt dikes, the congealed feeder sources of the Columbia River basalt plateau.
Grande Ronde GoosenecksAsotinFederalA deep canyon that follows a tortuous path along meanders.
The Great Gravel Bar of Moses CouleeDouglasState, privateLargest and best example of a pendent river bar formed by catastrophic glacial outburst floods that swept across the Columbia Plateau.
Kahlotus RidgetopFranklinStateThe best remaining example of the Central Palouse Prairie grassland subtheme.
Mima MoundsThurstonStateA prairie containing unusual soil pimples of black silt-gravel.
Nisqually DeltaPierce, ThurstonFederal, state, tribal, privateAn unusually fine example of an estuarine ecosystem. INcludes Nisqually National Wildlife Refuge.
Point of ArchesClallamFederalAn outstanding exhibit of sea action in sculpturing a rocky shoreline. A unit of Olympic National Park.
Rose Creek PreserveWhitmanPrivateThe best remaining example of the aspen phase of the hawthorne-cow parsnip habitat type in the Columbia Plateau. Managed by The Nature Conservancy.
Sims Corner Eskers and KamesDouglasFederal, state, privateThe best examples in the Columbia Plateau of landforms resulting from stagnation and rapid retreat of the ice sheet during the last glaciation.
Steptoe and Kamiak ButtesWhitmanState, county, privateIsolated mountain peaks of older rock surrounded by basalt, rising above the surrounding lava plateau.
Umtanum Ridge Water GapKittitasFederal, state, privateGeologic formation that illustrates the processes of tectonic folding and antecedent stream cutting.
Wallula GapBenton, Walla WallaFederal, state, county, municipalThe largest and most spectacular of several large water gaps through basalt anticlines in the Columbia River basin.
Withrow Moraine and Jameson Lake Drumlin FieldDouglasFederal, privateThe best examples of drumlins and the most illustrative segment of the only Pleistocene terminal moraine in the Columbia Plateau