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A gray 4x4 Sprinter with a roof rack on a two-track through a wildflower meadow, cloud sitting on the mountains behind.

Army Corps of Engineers campground

Plymouth Park

Army Corps of Engineers campground in John Day Lock and Dam, Lake Umatilla, Benton County, Washington. 291 feet. 20.1 miles from Kennewick.

Reserve on Recreation.gov
Managed by
Army Corps of Engineers John Day Lock and Dam, Lake Umatilla
Elevation
291 ft USGS elevation model, at the mapped point
Sites
31 30 standard electric, 1 group standard non-electric
Longest rig
55 ft The longest vehicle any site is listed for
Hookups
Electric, Water, Sewer
Reservations
Recreation.gov
County
Benton County

Overview

Plymouth Campground is located by the small town of Plymouth, Washington. The day use area and boat launch are on a small island on Lake Umatilla on the Columbia River.

Popular activities in the area include fishing, swimming, boating, water skiing and hunting.

Recreation

Visitors enjoy boating, water sports and swimming in the river.

Anglers fish for Chinook, steelhead, walleye, sturgeon, and shad. The boat ramp is located at the day use area for convenient river access.

Facilities

The campground offers 32 sites with electric hookups. Amenities include flush and pit toilets, showers, drinking water, a dump station and playground.

The day use area has a swim beach, boat ramp, flush toliets, vault toliet and courtesy dock.

Natural Features

The park is situated in a high desert environment on an island on the Columbia River. The island is covered with tall sage and Russian Olive trees, but shade is limited.

Wildlife is abundant in the area, and mule deer, waterfowl and raptors are commonly seen.

Nearby Attractions

McNary Dam and Visitor Center and Lake Wallula are two miles upstream from the campground. The lake offers additional opportunities for boating, swimming and fishing.

The description, directions and fees are the Army Corps of Engineers’s own words, from its record on Recreation.gov.

What people do here

  • birding
  • boating
  • camping
  • day use area
  • fishing
  • kayaking
  • star gazing
  • swimming site
  • tubing
  • water access
  • wildlife viewing

The land around Plymouth Park

The ringed pin is this campground; the others are its nearest neighbours. Switch on forest roads or BLM routes to see the way in.

Map layers

Layers
Base map
Legend

Federal land, by managing agency

  • Bureau of Land Management (BLM)
  • US Forest Service (USFS)
  • National Park Service (NPS)
  • US Fish and Wildlife (USFW)
  • Bureau of Reclamation (USBR)
  • Department Of Defense (DOD)
  • Bureau of Indian Affairs (BIA)
  • Other Federal
  • State
  • Local
  • Alaska Native Lands (Patented or Interim Conveyed)
  • Alaska Native Allotment

Federal campgrounds, by agency

  • Forest Service
  • Bureau of Land Management
  • National Park Service
  • Army Corps of Engineers
  • Reclamation, Fish and Wildlife and others

State and local land (USGS PAD-US)

  • State land
  • County and city land
  • Regional agency or district
  • Land trust or conservancy

Gaps with no tint inside public land are private parcels, often old mining claims and homesteads. They are not open to the public.

Dashed clay lines on the base map are unpaved tracks from OpenStreetMap. They show what exists on the ground, not what is legal to drive.

Select any point to see who manages the land.

Boundaries are approximate and land status changes. This map is a planning aid, not a survey or a statement of access. Confirm routes, closures and camping rules with the managing office.

Nearest campgrounds

Camping near

Source: Recreation Information Database (Recreation.gov), record updated August 27, 2026. Elevation from the USGS 3D Elevation Program. Seasons, fees, water and fire rules change; the managing office has the final word.

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