River Flows & Lake Levels

Please note: Mayfield Lake Park is closed from Dec. 20 through Jan. 1. Taidnapam, Alder Lake, and Mossyrock parks are closed for camping from 1 p.m. December 19 to January 1. For reservations starting on January 2, visit our online system or call 833-290-8180.

River flows as of Dec. 19

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 7,760 cubic feet per second (cfs)
Mayfield flow forecast (typically updated on Monday and Thursday afternoons) as of Thursday, Dec. 19: Discharge is planned to decrease on Friday to about 6,300 cfs, but it’s possible that it may decrease further, as low as 4,600 cfs during the weekend. Discharge will likely increase to 7,800 again on Monday.
*Click here to sign up for our Cowlitz River Project email list.

Nisqually River below LaGrande Dam – about 2,270 cfs

Wynoochee River above Black Creek – about 7,430 cfs

Wynoochee River at Grisdale – about 2,640 cfs

Green River at Palmer (Tacoma Water’s headworks) – 1,750 cfs

North Fork Skokomish River below Cushman Dam No. 2 – about 904 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 Dec. 19

Riffe Lake – 717.73 feet of elevation (maximum of approx. 749 ft)
*Mossyrock Park boat launch – The left lane is open. The day-use area is open. The swim area is closed for the season.
*Taidnapam North boat launch – Closed.
*Kosmos boat launch and parking lot are closed due to operational constraints. The launch is not usable below 747 feet and cannot be extended.
*Taidnapam Park boat launch is closed due to operational constraints. It is not usable below 760 feet and cannot be extended.
*Click here to sign up for our Cowlitz River Project email list.

Alder Lake – 1,181.24 feet of elevation (maximum of 1,207 ft)
*Alder Lake Park boat launch – Open.
*Rocky Point boat launch – Closed. Hand-launch only; day-use area and campground are open.
*Stacel Point day-use area is open.
*Sunny Beach Point is closed for the season. (Open May 15 to Sept. 15. Closed Sept. 16 to May 14.)

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

Wynoochee Lake – 778.31 feet of elevation (maximum of 800 ft)
*The day-use area is open.

Coho Campground and boat launch – Closed (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.