Riffe Lake (Mossyrock Park)
Lake · Washington
ℹ️ Community-reported spot. Details below are compiled from public sources and are reported to be accurate — always verify locally before visiting.
About this swimming hole
Mossyrock Park offers a swim beach on Riffe Lake, the Cowlitz River impoundment beneath the Cascades. The reservoir's setting in the forested foothills is scenic. It is Lewis County's big-water swim.
Good to know
| Water type | Lake |
|---|---|
| Water temperature | 60s-70s in summer |
| Depth | reservoir with swim beach |
| Best season | June-September |
| Fees | $5-10 day use |
| Reservations required | No |
| Hours | sunrise-sunset |
| Parking | park lots |
| Amenities | restrooms, picnic tables, campground, boat launch |
| County | Lewis County |
| Nearest town | Mossyrock |
| Safety notes | no lifeguard; boat traffic; fluctuating water levels |
Map
Nearby swimming holes
Frequently asked questions
Does Riffe Lake (Mossyrock Park) require reservations?
No reservations are required at Riffe Lake (Mossyrock Park) based on current information — but verify before you go.
Is there a fee to visit Riffe Lake (Mossyrock Park)?
Reported fee info: $5-10 day use. Fees can change — confirm with the official link.
When is the best time to visit Riffe Lake (Mossyrock Park)?
The best season is typically June-September.
⚠️ Verify before you go. Conditions, fees, reservations, and access can change — confirm details with the official link before visiting. Last verified: September 2026