Thompson Reservoir
Lake County, Oregon2,159 acresView mapDirections
No nutrient or algae sampling on record from Oregon DEQ for this lake.
- Impaired · Temperature
- Public access
Thompson Reservoir in Lake County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Surface area: 2159 acres.
Thompson Reservoir is a 2,159-acre lake in Lake County, Oregon. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Oregon DEQ. Methodology: how these readings are compared.
What Thompson Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Camping2 public campgrounds nearby
- Big water2,159 acres
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Thompson Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for temperature. Check local advisories before you swim.
Whether Thompson Reservoir is safe to swim in today is a call for the Oregon Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Thompson Reservoir
These are the measurements Oregon DEQ publishes for Thompson Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Thompson Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
2,159 acres
Shoreline
21.8 mi
Public access
Yes
Listed by Oregon DEQ
No bathymetric survey has been published for Thompson Reservoir, so its depth is not documented here.
Recreation & Access
- East Bay CampgroundPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Thompson Reservoir
- Eastbay1.3 km
- Thompson3.2 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays near Thompson Reservoir
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Fishing Thompson Reservoir
EPA Impairment Status
Thompson Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit OR_LK_1712000502_05_100979 · Official waterbody report
Nearby Lakes in Lake County
Frequently asked questions about Thompson Reservoir
Where is Thompson Reservoir?
- Thompson Reservoir is a lake in Lake County, Oregon. Its water-quality measurements are published by Oregon DEQ and shown on this page as reported.
What is the water quality of Thompson Reservoir?
- Thompson Reservoir in Lake County, Oregon has water-quality measurements published by Oregon DEQ, shown here as reported. Surface area: 2159 acres.
Is Thompson Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Thompson Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for temperature. Check local advisories before you swim.
Are there boat ramps on Thompson Reservoir?
- Thompson Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include East Bay Campground. Public access is listed as yes.
Can I fish at Thompson Reservoir?
- Thompson Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Oregon's fish and wildlife agency, so check its current regulations before you go.
Are there campgrounds on Thompson Reservoir?
- Thompson Reservoir has 2 public campgrounds from USGS The National Map within 5 km, including Eastbay, Thompson. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
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Where this data comes from
Measurements for Thompson Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles