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Community & Environment > Parks & Recreation > River Flows & Lake Levels

River Flows

River flows can change quickly and without warning. Boaters and anglers should remain alert and use caution near the river.

For real-time flow information:

  1. Select the link below for each river.
  2. Scroll down to “Select data to graph.”
  3. Select “Discharge, cubic feet per second.”

Cowlitz River 
Weekly Mayfield flow forecast (subject to change):

Current discharge on Monday, July 13 is 2,300 cfs.  Discharge may increase up to about 3,500 cfs as early as tonight for a few days and then returning back down to about 2,300 cfs by the weekend.

Nisqually River below LaGrande Dam

Wynoochee River above Black Creek

Wynoochee River at Grisdale

Green River at Palmer (Tacoma Water’s headworks)

North Fork Skokomish River below Cushman Dam No. 2

Related resources

Lake levels and boat launches

For real-time lake level information:

  1. Select the link below.
  2. Find the corresponding lake name in the “description” column.
  3. View the “stage” column.

Riffe Lake (Mossyrock Reservoir) (maximum of approx. 749 ft)

  • Mossyrock Park boat launch – Both left and right launches are open, and the dock is in the water. The day-use area remains open; the swim beach is open. Watch the live stream here.
  • The North Shore Fishing Area at Mossyrock Dam is open (updated Saturday, Dec. 23).
  • Taidnapam North boat launch – The north launch is open and the dock is in the water.
  • Kosmos boat launch and parking lot are closed.
  • Taidnapam Park boat launch is closed.Click here to sign up for our Cowlitz River Project email list.

Alder Lake (Nisqually – Alder Reservoir) (maximum of 1,207 ft)

  • Alder Lake Park boat launch – Open. (The launch is open whenever lake levels are at or above elevation 1171 ft. It will close if water drops below that elevation.)
  • 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 open. (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)

Lake Cushman (Cushman Dam) (maximum of 738 ft)

Wynoochee Lake (Wynoochee Dam) (maximum of 800 ft)

  • The day-use area is open.
  • Coho Campground and boat launch – Open (seasonal from mid-May to October). Update as of Aug. 27, 2025: The Coho Campground boat launch is closed to trailered boats until further notice. Hand-launch access remains available for kayaks, canoes, and other small car-top boats.

Get current campfire rules on the Parks & Recreation homepage.