Mayfield Lake, Ike Kinswa State 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
A reservoir on the Cowlitz River with swim beaches at Ike Kinswa State Park, set among old-growth cedars. The park's day-use area and campground make it a full-service summer swim destination for the Mossyrock side of Lewis County.
Good to know
| Water type | Lake |
|---|---|
| Water temperature | 70-75 in summer |
| Best season | June-September |
| Fees | Discover Pass |
| Reservations required | No |
| Hours | 8am-dusk |
| Parking | day-use and campground lots |
| Amenities | restrooms, campground, boat launch, picnic areas |
| County | Lewis County |
| Nearest town | Mossyrock |
| Safety notes | no lifeguard; boat traffic; reservoir levels fluctuate |
Map
Nearby swimming holes
Frequently asked questions
Does Mayfield Lake, Ike Kinswa State Park require reservations?
No reservations are required at Mayfield Lake, Ike Kinswa State Park based on current information — but verify before you go.
Is there a fee to visit Mayfield Lake, Ike Kinswa State Park?
Reported fee info: Discover Pass. Fees can change — confirm with the official link.
When is the best time to visit Mayfield Lake, Ike Kinswa State 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