Lake Ilswoot
King County, Washington43 acresView mapDirections
No nutrient or algae sampling on record from Washington Ecology for this lake.
Lake Ilswoot in King County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 43 acres.
Lake Ilswoot is a 43-acre lake in King County, Washington.
Source: EPA Water Quality Portal sampling records, WA Ecology. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Ilswoot 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 Lake Ilswoot
These are the measurements Washington Ecology publishes for Lake Ilswoot, 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 Lake Ilswoot
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
43 acres
Shoreline
1.3 mi
No bathymetric survey has been published for Lake Ilswoot, so its depth is not documented here.
Stays via Stay22
Stays near Lake Ilswoot
Compare lakeside cabins, hotels, and vacation rentals near Lake Ilswoot 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 Lake Ilswoot
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Washington’s top lakes →
Follow Lake Ilswoot’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Lake Ilswoot
Nearby Lakes in King County
Frequently asked questions about Lake Ilswoot
Where is Lake Ilswoot?
- Lake Ilswoot 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 Lake Ilswoot?
- Lake Ilswoot in King County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 43 acres.
Is Lake Ilswoot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Lake Ilswoot across LakeQuality
More lakes in Washington
Other Lakes in Washington
Where this data comes from
Measurements for Lake Ilswoot come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.