Plymouth Park is a national park campground at John Day Lock and Dam, Lake Umatilla in Benton County, Washington. Reservations are managed through Recreation.gov. When a booked site here is cancelled it can vanish within minutes, so Campsite Tonight monitors it 24/7 and auto-adds the opening to your Recreation.gov cart before anyone else.
Plymouth Park is in very high demand — sites here routinely sell out well in advance. Cancellations are often the best way in, which is exactly what Campsite Tonight watches for.
The campground accommodates RVs and trailers up to 55 ft. Campers rate it 4.2/5 across 328 reviews.
Total reservations in April — 2023: 174 · 2024: 194 · 2025: 107
Address
Plymouth, Washington
Coordinates
45.9337, -119.3507
Very high demand - sites typically fill up immediately when the booking window opens. Plan to book the moment reservations open.
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