Thompson Lake
King County, Washington49 acresView mapDirections
No nutrient or algae sampling on record from Washington Ecology for this lake.
- 50 ft max depth
Thompson Lake in King County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 50 ft. Surface area: 49 acres.
Thompson Lake is a 49-acre lake in King County, Washington with a maximum depth of 50 feet.
Source: EPA Water Quality Portal sampling records, WA Ecology. Methodology: how these readings are compared.
What Thompson Lake is good for
From access and monitoring records, not editorial picks.
- Deep water50 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Thompson Lake is safe to swim in today is a call for the Washington State Department of Ecology and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Thompson Lake
These are the measurements Washington Ecology publishes for Thompson Lake, 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 Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
50 ft
Surface area
49 acres
Shoreline
1.3 mi
Stays via Stay22
Stays near Thompson Lake
Compare lakeside cabins, hotels, and vacation rentals near Thompson Lake in King County, Washington — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Thompson Lake
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Frequently asked questions about Thompson Lake
Where is Thompson Lake?
- Thompson Lake is a lake in King County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.
What is the water quality of Thompson Lake?
- Thompson Lake in King County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 50 ft. Surface area: 49 acres.
Is Thompson Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Thompson Lake?
- Thompson Lake has a maximum depth of 50 feet. The lake covers 49 acres.
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Where this data comes from
Measurements for Thompson Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.