Grays River / Seal Slough

Rosburg, Washington 98643

Grays River / Seal Slough

Grays River / Seal Slough Professional Guide

Detailed Trail Description from our Guidebook

"Grays River is a small tributary of the Columbia River named for Captain Robert Gray, who discovered the Columbia (the river was named for his ship, the Columbia Rediviva). Seal Slough is a tributary of Grays River that enters it about 2 miles from its mouth.

Nearby Deep River feeds into Grays Bay about 2 miles west of the mouth of Grays River. All these segments are tidal. Washington’s only extant covered bridge lies on Grays River at RM 9.6, a mile above the upper extent of tidal influence. While this region is extremely rainy, it offers excellent birding and unique paddling opportunities through a historical landscape. Lewis and Clark camped briefly on the west shore of Grays Bay the fall of 1805."

Grays River / Seal Slough Reviews

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Fun canoe overnighter with no shuttle needed! Slow moving river through beautiful farmland.

Caught the tide coming in & were able to paddle upstream almost all the way to the covered brige. We did make it to the bridge, but had to walk the canoe through some of the more swift/low water sections to get there. The tide influence gives out about a mile or so below the bridge. Tide is definitely a factor here, it looks like water level changes 3-4 feet between high & low tide.

We camped overnight on a small island above the tide influence and paddled back out with the tide the next day. This way we were able to put in/take out at the Rosburg Community Hall parking lot.

Another tip, wouldn't recommend driving over the Astoria bridge w/ canoe on top of car (or make sure to really tighten it down.) Wind pushes canoe around a lot (spooky!) and the bridge will never seem so LONG!

Fun alternative (if coming from/ going to Oregon) is taking the toll ferry ($3) across at Puget Island (Cathlamet/Westport)

Grays River / Seal Slough Photos

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Trail Information

Nearby City
Skill Level
3 mph at slack tide
Class II
Best: Year-round, but best in rainy season, September through May
Wahkiakum County Visitor Information; Washington Department of Fish and Wildlife website for Wildlife Areas and Access Points
Local Contacts
USGS Grays River; NOAA charts 18521, 18523
Local Maps

Activity Feed

Dec 2018