Tacoma Power's Mossyrock Park is a family-friendly getaway with access to Riffe Lake (formed by Mossyrock Dam) in Lewis County, Washington.

Please note: Due to changes to Riffe Lake levels in 2017, the current swim area will not be usable this summer. We have proposed creating a new swim area, and the process is in the permitting phase. The boat launch is open; two lanes are usable (one to 723 feet, the other to 737 feet). We are exploring temporary and permanent improvements to the boat launch. Construction on permanent improvements would need to take place this winter when the water is at its lowest level.

Get updates on lake levels, boat launches and swim areas, or call 1-888-502-8690 for recorded info.

Get the latest burn ban updates.

Reservations for Mossyrock Park

Or call (888) 226-7688 for reservations. 

Know before you go

  • Learn about reservation policies and park rules.
  • Reserve individual sites up to nine months in advance for dates between May 15 and Sept. 15.
  • Reserve group camps up to nine months in advance for dates between April 15 and Oct. 15.
  • Sites are available on a first-come, first-served basis the rest of the year.
  • Please note that during hot weather or high demand for electricity in the park, electrical service may be disrupted or unavailable.

No reservation?
Available campsites that have not been reserved are available for one-night "walk-in" stays between May 15 and Sept. 15.

About Mossyrock Park camping

  • Year-round camping, day-use area and boat launch (park is closed Dec. 20 - Jan. 1)
  • 152 individual campsites (76 water/electric hookups)
  • 48-site group camp with nine pods of five or six sites (25 electric hookups)
  • Two primitive group camps (12 sites, no hookups)
  • Fire rings and picnic tables in all campsites
Other features of Mossyrock Park
  • Store and fast-food concession stand (seasonally operated) 
  • Coin-operated showers
  • Laundry facilities
  • Wheelchair-accessible sites and restrooms
  • Water faucets throughout campground
  • Reservable kitchen shelter
  • Trails: half-mile trail and 3.5-mile loop trail (of which 0.8 miles is wheelchair accessible)

Year-round day-use area (park is closed Dec. 20 - Jan. 1)

There is a $5 day-use parking fee charged on weekends and holidays between Memorial Day and Labor Day weekends. Enjoy free day-use parking on other days.

  • Boat launch (lake level permitting; two lanes are usable for the summer of 2017)
  • Fish cleaning station
  • Swimming area (closed for the summer of 2017)
  • Playground
  • Horseshoe pits
  • Volleyball court
  • Store and fast-food concession stand (seasonally operated)

Download our Mossyrock Park Brochure.  

 Mossyrock Park Fees & Discounts

Camping fees  
Water/electric hookups (30-amp service) $33
Electric hookups (30-amp service) (group sites) $28
No hookups $26
Walk-in tent and S’mores Loop sites $20
Primitive group camp (must reserve all 12 sites) $185
Extra vehicle/RV, if space allows (no charge for towed vehicles) $10
Unattended vehicle $10
Other fees  
Reservation fee $8 online or $10 by phone
Day-use parking (weekends and holidays between Memorial Day and Labor Day weekends) $5 
Kitchen shelter $50
Senior or disabled discount for camping $5


Latitude: N 46 30 58.6   Longitude: W 122 25 24.5 

From Tacoma, take Interstate 5 south to Highway 12 East (Exit 68). Drive east on Highway 12 for approximately 21 miles. Turn right on Williams Street (flashing yellow light). Continue several blocks on Williams Street to a "T" intersection in the town of Mossyrock. Turn left onto State Street. Outside of town, State Street becomes Mossyrock Road East and then Ajlune Road. Ajlune Road leads into the park.

Mossyrock Park
202 Ajlune Rd.
Mossyrock, WA 98564

Park office: (360) 983-3900
Fishing and recreation line: (888) 502-8690
Reservations: (888) 226-7688