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The 31-mile Klickitat State Park Trail hugs the meanders of the Klickitat River and its tributary, Swale Creek, revealing stories of massive volcanic flows, bubbling mineral springs, timeless Indigenous subsistence traditions, ephemeral attempts at wresting profits from the land, and a delightful environment of oak and pine woodlands and grasslands. The trail stretches from a windswept plateau 1,600 feet above sea level to the river’s confluence with the mighty Columbia River barely 100 feet above sea level.

An Island In the Salish Sea

Blake Island Marine State Park, located in the heart of Puget Sound, has long been a desired getaway spot, now surrounded by the homes of millions of people.

Alta Lake State Park is located on the shores of an unusual body of water. Its namesake lake, perched 1,166 feet above sea level inside a meandering trench between the Methow and Chelan valleys, has no visible inlet or outlet.

Ebey’s Landing State Park Heritage Site is situated at a point where tall bluffs of ice age glacial outwash that ring most of Whidbey Island gently lower to the sea, affording easy access from the saltwater beach to the open prairies of the island’s interior. People have lived here for more than 10,000 years. It is among the most culturally significant settings in the Pacific Northwest.

Rasar State Park lies midway along the Skagit River’s winding path between the rugged North Cascade Mountains and the Salish Sea. The Skagit River, part of the National Wild and Scenic Rivers System, is the second largest river on the west coast of the contiguous United States, after the Columbia. Like much of the Skagit River Valley, the park land is naturally terraced as the river has cut into glacial deposits from the ice age.

Skagit Island Marine State Park is a delightfully pristine small island located in Skagit County near Deception Pass.

Rock From Spreading Tectonic Plates

The bedrock that makes up Skagit Island is part of a larger assemblage of rocks that outcrop on nearby islands and collectively make up an ophiolite sequence, a distinctive formation of rocks formed where the sea floor has spread apart at a tectonic plate boundary.

Stuart Island Marine State Park is a favorite boating destination with an interesting convergence of personal histories.

Sediments and Folds

The rocks that make up Stuart Island are made of siltstone and sandstone that formed from sediments deposited by river deltas and massive underwater landslides on the sea floor about 75 million years ago, at a location hundreds of miles south of today’s Stuart Island. Geologists call this formation the Nanaimo Group.

Clark Island Marine State Park preserves an entire long, narrow island along the northern edge of the San Juan Archipelago.

A Rocky Island

The San Juan Islands are distinct from most of Puget Sound in that they feature shorelines with exposures of hard bedrock, rather than the bluffs of clay, sand and gravel left by Ice Age glaciers that are predominant on most of Washington’s Salish Sea, the state’s inland saltwater passages.

Blind Island Marine State Park is a favorite campsite for kayakers located in the heart of the San Juan Archipelago a short distance offshore from Shaw Island.

A Rocky Island

The San Juan Islands are distinct from most of Puget Sound in that they feature shorelines with exposures of hard bedrock, rather than the bluffs of clay, sand and gravel left by Ice Age glaciers that are predominant on most of Washington’s Salish Sea, the state’s inland saltwater passages.

Posey Island Marine State Park is a small island featuring a popular campsite for kayakers that is easily accessible from the northwestern part of San Juan Island.

A Rocky Island

The San Juan Islands are distinct from most of Puget Sound in that they feature shorelines with exposures of hard bedrock, rather than the bluffs of clay, sand and gravel left by Ice Age glaciers that are predominant on most of Washington’s Salish Sea, the state’s inland saltwater passages.

Washington’s Sand Sea

Potholes State Park is set in a unique environment dominated by ancient sand dunes and a modern irrigation reservoir.

In the final stages of the most recent ice age, masses of glacial ice repeatedly blocked meltwater drainage, creating huge bodies of impounded water in northern Washington, Idaho and Montana. When the ice dams melted or were breached by the sheer weight of water behind them, gigantic Ice Age floods swept over the landscape.

Turn Island Marine State Park preserves an entire island that lies just offshore from a point on the eastern side of San Juan Island.

A Rocky Island

The San Juan Islands are distinct from most of Puget Sound in that they feature shorelines with exposures of hard bedrock, rather than the bluffs of clay, sand and gravel left by Ice Age glaciers that are predominant on most of Washington’s Salish Sea, the state’s inland saltwater passages.

Burrows Island Marine State Park preserves the majority of a wild-wooded island just offshore of Anacortes. Its forested summit rises nearly 650 feet above the churning waters that surround the island. The bedrock that makes up Burrows Island is part of a larger assemblage of rocks that outcrop on nearby islands and collectively make up an ophiolite sequence, a distinctive formation of rocks formed where the sea floor has spread apart at a tectonic plate boundary.

Patos Island Marine State Park provides a favorite campsite for paddlers and moorage for sailors, located on the northernmost edge of the San Juan Archipelago, noted for its historic lighthouse and wild, remote shores.

A Rocky Island

The San Juan Islands are distinct from most of Puget Sound in that they feature shorelines with exposures of hard bedrock, rather than the bluffs of clay, sand and gravel left by Ice Age glaciers that are predominant on most of Washington’s Salish Sea, the state’s inland saltwater passages.

Between the Mountains and the Sea

Dosewallips State Park features extensive tidelands at the mouth of the Dosewallips River on Hood Canal. Erosion of the Olympic Mountains to the west combined with the steep gradient of the river carries a large quantity of sediment downriver. Silt, sand and gravel are deposited by the river when it reaches the flatter terrain in the park, naturally braiding its riverbed with many channels as it flows towards Hood Canal. The large fan of sediment and mud at the river’s mouth has long been a rich estuary.

A Mountain on an Island

The pinnacle of Moran State Park, Mount Constitution, rises 2,407 feet directly from sea level to the second highest point on an oceanic island in the contiguous 48 US states. The rocks that make up the heights of Mount Constitution began as lava erupting on the ocean floor or slowly accumulating sediments formed by skeletons of marine microorganisms, windblown dust and volcanic ash settling to the ocean floor. The pillow basalts, chert and shale seen at rocky exposures in the park are evidence of these events.

The story of Mount Pilchuck State Park goes deep. The distinctive blocks of light-colored quartz monzonite (a rock like granite but with a smaller proportion of quartz crystals) that a hiker must scramble over to reach the historic fire lookout were once molten magma slowly cooling thousands of feet below the earth’s surface. The mechanisms of plate tectonic subduction elevated the rocks to 5,324 feet above sea level to put Mount Pilchuck’s prominent alpine summit barely 18 miles from salt water at the Snohomish River estuary.