Where is Cottage Lake?

Cottage Lake is a lake in King County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.

Cottage Lake

King County, Washington63 acresView map Directions

No nutrient or algae sampling on record from Washington Ecology for this lake.

Area

63 acres

Surface area

Shoreline

1.4 mi

Measured length

Impaired · Nuisance exotic species

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Cottage Lake in King County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 63 acres.

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Cottage Lake is a 63-acre lake in King County, Washington.

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

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Cottage Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nuisance exotic species, nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Whether Cottage 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.

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Water quality measurements for Cottage Lake

These are the measurements Washington Ecology publishes for Cottage 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 Cottage Lake

Answers come straight from the public measurements and survey records on this page.

Lake Details

Surface area

63 acres

Shoreline

1.4 mi

No bathymetric survey has been published for Cottage Lake, so its depth is not documented here.

Stays via Stay22

Stays near Cottage Lake

Compare lakeside cabins, hotels, and vacation rentals near Cottage 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.

Top-rated places to stay near Cottage Lake

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Fishing Cottage Lake

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

EPA Impairment Status

Cottage Lake is officially listed as impaired under Clean Water Act §303(d) in the 2018 EPA reporting cycle (IR category 4A).

Causes of impairment

Nuisance exotic speciesNutrients (phosphorus, nitrogen)

Designated uses not supporting: Aquatic life.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit WA17110012000387_001_001 · Official waterbody report

Nearby Lakes in King County

Lake Sammamish11.5 ft clear—View →Phantom Lake—View →Ames Lake9.8 miView →Pine Lake—View →Lake Marcel8.9 miView →Beaver Lake—View →

Frequently asked questions about Cottage Lake

Where is Cottage Lake?: Cottage 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 Cottage Lake?: Cottage Lake in King County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 63 acres.
Is Cottage Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Cottage Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nuisance exotic species, nutrients (phosphorus, nitrogen). Check local advisories before you swim.