River Flows & Lake Levels

River flows as of June 1

To get real-time flow information, click the links for each river, then scroll down the page to “Select data to graph” and click “Discharge, cubic feet per second.”

Cowlitz River below Mayfield Dam – about 5,140 cubic feet per second (cfs)
Mayfield flow forecast (typically updated on Monday and Thursday afternoons) as of Thursday, June 1: Discharge will decrease slightly to about 5,080 cfs and remain there through the weekend. Click here to sign up for our Cowlitz River Project email list.

Nisqually River below LaGrande Dam – 984 cfs

Wynoochee River above Black Creek – 366 cfs

Wynoochee River at Grisdale – 246 cfs

Green River at Palmer (Tacoma Water’s headworks) – 249 cfs

North Fork Skokomish River below Cushman Dam No. 2 – 251 cfs
Click here to sign up for our Cushman Hydro Project email list.

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 June 1

Riffe Lake – 740.21 feet of elevation (maximum of approx. 749 ft)
Click here to sign up for our Cowlitz River Project email list.
Mossyrock Park boat launch is open (both lanes). The dock is usable. The day-use area is open.
Taidnapam North boat launch is open. The dock is usable.
Kosmos boat launch and parking lot are closed.
Taidnapam Park boat launch is closed.

Alder Lake – 1,202.63 feet of elevation (maximum of 1,207 ft)
Alder Lake Park boat launch is open. The day-use area is open.
Rocky Point boat launch (hand-launch only), day-use area, and campground are open.
Stacel Point day-use area is open.
Sunny Beach Point day-use area and swim area are open. (They are open May 15 – Sept. 15.)

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 – 736.64 feet of elevation (maximum of 738 ft)
Click here to sign up for our Cushman Hydro Project email list.
The Lake Kokanee boat launch is open.
Get information about Skokomish Park at Lake Cushman.

Wynoochee Lake – 770.19 feet of elevation (maximum of 800 ft)
The day-use area is open.

Coho Campground and boat launch are closed. They are typically open from mid-May to October.

Get current campfire rules on the Parks & Recreation homepage.

River flows could change at any time so boaters and anglers should remain alert for this possibility.