This Washington lake is 600 feet deep and you can see 60 feet straight through it

Lake Crescent’s blue water hides ancient secrets

Lake Crescent sits inside Olympic National Park, about 18 miles west of Port Angeles, and it doesn’t look like any lake you’ve seen before.

The water runs a deep, electric blue, and on a calm morning, you can peer straight down through 60 feet of it. Glaciers carved this valley during the last Ice Age.

A massive landslide sealed it off thousands of years ago. What happened inside that sealed basin, over all those years, is still surprising scientists today.

The lake that stayed too clean for algae to survive

The water looks the way it does for a simple reason: there’s almost no nitrogen in it. No nitrogen means no algae, and no algae means nothing clouds the water.

Biologists classify Lake Crescent as ultra-oligotrophic, meaning it sits at the extreme low end of nutrient levels.

The lake runs about 12 miles long, surrounded by old-growth forest and the peaks of the Olympic Mountains. Highway 101 follows the southern shore, and pullout after pullout gives you a place to stop and stare.

A Klallam legend and a landslide tell the same story

About 7,000 years ago, a landslide separated Lake Crescent from nearby Lake Sutherland.

The slide blocked the original drainage and pushed the water to find a new outlet through the Lyre River to the Strait of Juan de Fuca. The Klallam people had already explained this.

Their tradition says Mount Storm King, furious at fighting between the Klallam and Quileute tribes, threw a boulder between them to end the conflict and split the lake.

Modern scientists have confirmed that multiple large landslides entered the lake between roughly 5,200 BCE and 1,100 BCE, matching the story closely.

Two trout that exist nowhere else on the planet

When the landslide sealed the lake, it trapped fish that had once migrated to the ocean. Cut off from everything else for thousands of years, those fish changed.

Two species evolved inside Lake Crescent and nowhere else: the Beardslee trout, a rainbow trout relative with recorded weights up to 23 pounds, and the Crescenti cutthroat trout.

The lake barely feeds them, yet they’ve thrived in it for millennia.

All fishing here runs catch-and-release only, with artificial lures and barbless hooks, to keep these populations alive.

Walk less than a mile and stand under a 90-foot waterfall

Marymere Falls is about 0.9 miles one way from the Storm King Ranger Station, and the trail earns its reputation.

It moves through old-growth forest where towering conifers block most of the sky, past mossy maples and sword ferns, over wooden bridges crossing Barnes Creek and Falls Creek.

The last stretch climbs about 200 feet on maintained steps to two viewpoints. The falls drop 90 feet, fed by Falls Creek, and the mist reaches you well before you get close.

The trail connects to the Moments in Time Trail, an easy half-mile loop along the shoreline suitable for all ages.

A WWI railroad turned into a 10-mile accessible trail

In 1918, crews built a railroad through this valley to haul Sitka spruce timber for World War I aircraft. The war ended in 1918.

The railroad finished in 1919, a year too late to matter, and sat unused until it closed in 1951.

Today that same route runs as the Spruce Railroad Trail, a 10-mile paved path open to hikers, cyclists, equestrians and wheelchair users, one of the most accessible trails in any national park.

Two restored railroad tunnels, the 450-foot McFee Tunnel and the shorter Daley-Rankin Tunnel, break up the route. Dogs on leash are welcome here, unlike most trails in the park.

Devil’s Punchbowl draws swimmers and a word of caution

About a mile along the Spruce Railroad Trail from the Lyre River Trailhead, a short side path drops down to a rocky cove on the north shore.

Devil’s Punchbowl has deep, clear water and a footbridge that draws swimmers who jump from it into the lake below.

The water is cold year-round, and there have been fatalities here, so the decision to jump deserves real thought. On summer weekends the cove fills up fast.

Go early, or come in September when the crowds have thinned and the water has had all summer to warm slightly.

Mount Storm King rewards the climb with a view over two bodies of water

The Mount Storm King Trail splits off from the Marymere Falls route and heads straight up.

The maintained section runs 1.3 miles one way with about 1,700 feet of elevation gain, finishing at a viewpoint over Lake Crescent and the Strait of Juan de Fuca.

Beyond that point, an unmaintained section uses fixed ropes to reach the summit, but the park doesn’t install or maintain those ropes. Search and rescue goes out on this trail multiple times each year.

The lower viewpoint gives you the blue lake spread below forested ridgelines, and for most people, that’s enough.

Paddle out and look straight down through the water

The lake sits sheltered among the mountains, and early mornings often leave the surface flat and still.

Kayaks, canoes, paddleboards and rowboats are available for rent from the Lake Crescent Lodge dock during peak season.

You can work your way along hidden coves, watch for bald eagles and blacktail deer on the banks, and look straight down through the water to the rocky bottom.

If you bring your own watercraft, boat launches sit at both the east and west ends of the lake. Motorized boat traffic is limited, so it stays quiet.

Divers find standing trees and a sunken truck on the lake floor

Scuba divers come here for the clarity, with underwater visibility running 30 to 50 feet and sunlight reaching 120 feet down or deeper.

Near Barnes Point, a submerged forest of standing trees rests about 60 feet below the surface, preserved by the cold, clear water.

Elsewhere on the lake floor, a sunken wooden barge sits near East Beach, and a 1927 Chevrolet truck rests at greater depth.

The underwater walls near shore drop off sharply, a result of the same ancient landslides that shaped everything above the waterline. Dive flags are required by law.

The lake’s depth has been a mystery for decades

For years, some believed Lake Crescent ran deeper than 1,000 feet, based on depth readings taken during power cable installation in the 1980s.

A 2013 to 2014 survey using more than 5,000 depth soundings found a maximum depth of 596 feet. A 2016 USGS multibeam study came back with similar numbers, close to 600 feet.

The older readings, scientists now think, came from sonar bouncing off steep underwater slopes. The National Park Service’s official figure from a 1970 survey is 624 feet.

The lake holds an estimated half a cubic mile of fresh water, and much of the shoreline drops as sheer underwater cliffs.

Sol Duc, Elwha and Hurricane Ridge are all within an hour

Lake Crescent sits close to some of the best scenery in the Pacific Northwest.

The Sol Duc Valley is less than 30 minutes away, where natural hot springs and Sol Duc Falls, a powerful cascade that splits around a rock column, are both worth the detour.

The Elwha Valley, also within a short drive, is the site of one of the largest dam removals in U.S. history, with the river now running free and habitat recovering.

Hurricane Ridge, with mountaintop views of the Olympic Range and the Strait of Juan de Fuca, is about an hour from the lake.

The Hoh Rain Forest, one of the finest remaining temperate rainforests in the country, is roughly an hour from the lake’s west end.

Visit Lake Crescent in Olympic National Park, Washington

You can reach Lake Crescent from Seattle in about three hours via the Bainbridge Island or Edmonds-Kingston ferry, then west on Highway 101.

An Olympic National Park entrance pass gets you in, and the America the Beautiful annual pass works here.

Lake Crescent Lodge, a historic property dating to around 1915 and listed on the National Register of Historic Places, is open generally late May through October.

Fairholme Campground and Log Cabin Resort both run seasonally.

Check the official website for current hours, availability and road conditions before you go, as many facilities close from fall through spring.

This article was created with AI assistance and human editing.

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