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River Flows & Lake Levels

River flows as of Sept. 22

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The Barrier Dam spillway upgrade construction project is taking place through Oct. 1.

Cowlitz River below Mayfield Dam – about 2,560 cubic feet per second (cfs)
Mayfield flow forecast (typically updated on Monday and Thursday afternoons) as of Monday, Sept. 20: We plan to maintain the current discharge through the week.

Nisqually River below LaGrande Dam – 755 cfs

Wynoochee River above Black Creek – 416 cfs

Wynoochee River at Grisdale – 337 cfs

Green River at Palmer (Tacoma Water’s headworks) – 224 cfs

North Fork Skokomish River below Cushman Dam No. 2 – 154 cfs

Check out water safety resources. River flows can change at any time.

Subscribe to available Water Alerts provided by the US Geological Survey.

Lake levels and boat launches as of Sept. 22

Riffe Lake – 724.24 feet of elevation (maximum of approx. 749 ft)
Learn about changes to Riffe Lake levels.
Mossyrock Park boat launch (both lanes and the dock) and day-use area are open.
Taidnapam North boat launch is open. The dock is not usable.
Kosmos boat launch and parking lot are closed.
Taidnapam Park boat launch is closed.

Alder Lake – 1,189.48 feet of elevation (maximum of 1,207 ft)
Alder Lake Park boat launch and day-use area are open.
Rocky Point boat launch, day-use area, and campground are open.

Mayfield Lake – may fluctuate 4 feet weekly, between 421 and 425 feet of elevation (maximum of 425 ft)
Mayfield Lake Park boat launch and day-use area are open.

Lake Cushman – 729.29 feet of elevation (maximum of 738 ft)
The Lake Kokanee boat launch is open.
Get information about Skokomish Park at Lake Cushman.

Wynoochee Lake –  767.27 feet of elevation (maximum of 800 ft)
The day-use area is open.

Coho Campground and boat launch are open.

Get current campfire rules on the Parks & Recreation homepage.