River Flows & Lake Levels

Power Public Notice: Tacoma Power will be closing the Blue Creek Boat Launch area to camping due to Geophysical testing in preparation for our Cowlitz Trout Hatchery Remodel alternative analysis.  The site will be closed to camping from the evening of August 4 through 9.  The boat ramp and associated parking will remain open during this time.

River flows as of July 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 2,490 cubic feet per second (cfs)
Mayfield flow forecast (typically updated on Monday and Thursday afternoons) as of Thursday, July 18: Discharge is planned to remain at the current level through the weekend. It is possible that discharge may increase as high as about 6,500 cfs during this time.
*Click here to sign up for our Cowlitz River Project email list.

Nisqually River below LaGrande Dam – about 761 cfs

Wynoochee River above Black Creek – about 314 cfs

Wynoochee River at Grisdale – about 228 cfs

Green River at Palmer (Tacoma Water’s headworks) – 170 cfs

North Fork Skokomish River below Cushman Dam No. 2 – about 144 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 July 19

Riffe Lake – 743.87 feet of elevation (maximum of approx. 749 ft)
*Mossyrock Park boat launch – Both lanes and the dock are open. One lane is usable to about 720 feet; the other is usable to about 708 feet. The day-use area is open. The swim area is usable (it is usable to about 728 feet).
*Taidnapam North boat launch is currently open. Weather permitting, intermittent closures will occur starting this Wednesday and over the next two weeks so we can pour concrete for the turnaround. Closures should be limited to two hours at a time.
*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 – 1,203.62 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 – 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 – 737.48 feet of elevation (maximum of 738 ft)
*Lake Kokanee boat launch is open.
*Get information about Skokomish Park at Lake Cushman.
*Click here to sign up for our Cushman Hydro Project email list.

*We will be conducting our annual siren testing at Cowlitz on April 3, 2024 at 1:00pm. For more information, visit the Cushman Hydro Project page.

Wynoochee Lake – 793.57 feet of elevation (maximum of 800 ft)
*The day-use area is open.

Coho Campground and boat launch are open (typically 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.