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Preacher's Slough to Blue Slough

Southwest Washington


Southwest Washington -- Long Beach Area
View map below


7.0 miles, roundtrip


Gain: 0 ft.
Highest Point: 20 ft.


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Parking Pass/Entry Fee

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Rain, rain don't go away, come again so I can play! If you're bundled up in good gear, you might be singing this on this hike. The nearby town of Raymond is notable for being one of the rainiest in the state, with 83 inches of precipitation reported annually.

That makes the perfect habitat for plants and animals that like it as wet as possible -- and these thrive at Preacher's Slough on the Chehalis River Surge Plain. The 3,018-acre wetland spreads out near the mouth of the Chehalis River, where it mingles with the saltwater of Grays Harbor and creates a nutrient-rich environment.

Sitka spruce and western redcedar thrive here, though there are also beech trees lining the trail. As you hike, interpretive signs are tucked among the trees, offering information about salmon habitat, the history of the area (including how Preacher's Slough got its name), and why the railroad no longer runs on this side of the slough.

Because of its rich habitat for fish, the surge plain also provides a good home for osprey and bald eagles.

Walking along the trail, visitors are accompanied by traffic noise periodically, as it closely parallels the access road. It's three and a half miles to Blue Slough, another parking area with room for about seven cars and a boat launch. The seven mile round trip hike is a good workout, despite being rather flat, but if you don't feel like doing the whole route, a good turnaround point is the bench and overlook, indicated by a green sign on the righthand side of the trail.

WTA Pro Tip: DNR has posted a warning about the presence of New Zealand Mudsnails in the slough. If you are planning on boating or wading in the water, take a look at the postings (available at both trailheads) on how to prevent the spread of this invasive species.


Preacher's Slough to Blue Slough

Map & Directions

Co-ordinates: 46.9449, -123.6502 Open map in new window


Southwest Washington -- Long Beach Area

Chehalis River Surge Plain (#)

Washington State Department of Natural Resources

See weather forecast

Guidebooks & Maps

Day Hiking: Olympic Peninsula (Romano - Mountaineers Books)

USGS Central Park

Getting There

From Montesano, follow Highway 107 west for four miles,turning right onto Preachers Slough Road. Continue for 0.1 mile to trailhead.

Parking Pass/Entry Fee

Discover Pass

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Preacher's Slough to Blue Slough

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