Where is Thompson Lake?

Thompson Lake is a lake in Kootenai County, Idaho. Its water-quality measurements are published by Idaho DEQ and shown on this page as reported.

How deep is Thompson Lake?

Thompson Lake has a maximum depth of 24.9 feet. The lake covers 97 acres.

Are there boat ramps on Thompson Lake?

Thompson Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Thompson Lake Outlet. Public access is listed as yes.

Can I fish at Thompson Lake?

Thompson Lake 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 Idaho's fish and wildlife agency, so check its current regulations before you go.

Thompson Lake

Kootenai County, Idaho97 acresView map Directions

No nutrient or algae sampling on record from Idaho DEQ for this lake.

Max depth

24.9 ft

Bathymetric survey

Area

97 acres

Surface area

Shoreline

1.6 mi

Measured length

Impaired · Mercury
25 ft max depth
Public access

See the measurements Directions Where to stay

Thompson Lake in Kootenai County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Maximum depth: 24.9 ft. Surface area: 97 acres.

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Thompson Lake is a 97-acre lake in Kootenai County, Idaho with a maximum depth of 25 feet. Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, IDEQ. Methodology: how these readings are compared.

What Thompson Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp

Swimming conditions

No reading

Recreation use not supported

Nutrient and algae readings are not a swimming clearance. Thompson Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury). Check local advisories before you swim.

Whether Thompson Lake is safe to swim in today is a call for the Idaho Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Thompson Lake

These are the measurements Idaho DEQ 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

24.9 ft

Surface area

97 acres

Shoreline

1.6 mi

Public access

Yes

Listed by Idaho DEQ

Recreation & Access

Boat Landings

Yes

Public Access

Thompson Lake OutletPublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

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Stays near Thompson Lake

Compare lakeside cabins, hotels, and vacation rentals near Thompson Lake in Kootenai County, Idaho — 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

→ Thompson Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Thompson Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).

Causes of impairment

MercuryMetals (other than mercury)

Designated uses not supporting: Aquatic life, Recreation.

Source: EPA ATTAINS assessment unit ID17010303PN025L_0L · Official waterbody report

Nearby Lakes in Kootenai County

Thompson Lake0.7 miView →Anderson Lake2 miView →Blue Lake1.7 miView →Harrison Slough3.3 miView →Black Lake4 miView →Coeur D' Alene Lake5 miView →

Frequently asked questions about Thompson Lake

Where is Thompson Lake?: Thompson Lake is a lake in Kootenai County, Idaho. Its water-quality measurements are published by Idaho DEQ and shown on this page as reported.
What is the water quality of Thompson Lake?: Thompson Lake in Kootenai County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Maximum depth: 24.9 ft. Surface area: 97 acres.
Is Thompson Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Thompson Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury). Check local advisories before you swim.
How deep is Thompson Lake?: Thompson Lake has a maximum depth of 24.9 feet. The lake covers 97 acres.
Are there boat ramps on Thompson Lake?: Thompson Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Thompson Lake Outlet. Public access is listed as yes.
Can I fish at Thompson Lake?: Thompson Lake 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 Idaho's fish and wildlife agency, so check its current regulations before you go.