Campground · WA
Plymouth Park
WA · John Day Lock and Dam, Lake Umatilla
Booking is hardest here in April (5/10) and easiest in October (2/10). Pick a month below for the full breakdown.
Booking difficulty by month
Midweek tip: in the busiest month (April), arrivals are lightest on Wednesday — shift your dates to improve your odds.
When reservations open
Booking window
Reservations open on a rolling 6-month window at 7:00 AM America/New York.
For example, sites for January 15, 2027 become bookable on July 15, 2026. Set a reminder a few minutes before release for the best shot.
Standard Recreation.gov 6-month rolling window: sites become bookable 6 months before arrival at 7:00 AM ET.
Sites & amenities
- 30 electric sites
- 32 water hookups
- 11 sewer hookups
- 32 RV sites
- Max RV length 55 ft
Activities: SWIMMING SITE, WILDLIFE VIEWING, FISHING, CAMPING, BOATING, BIRDING, DAY USE AREA, KAYAKING, TUBING, WATER ACCESS, STAR GAZING