Twentymile Lake
Yukon-Koyukuk County, Alaska388 acresView mapDirections
No nutrient or algae sampling on record from Alaska DEC for this lake.
- 28 ft mean depth (modelled)
Twentymile Lake in Yukon-Koyukuk County, Alaska has water-quality measurements published by Alaska DEC, shown here as reported. Surface area: 388 acres.
Twentymile Lake is a 388-acre lake in Yukon-Koyukuk County, Alaska with an estimated average depth of about 28 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency. 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 Twentymile Lake is safe to swim in today is a call for the Alaska Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Twentymile Lake
These are the measurements Alaska DEC publishes for Twentymile 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.
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Answers come straight from the public measurements and survey records on this page.
Lake Details
Mean depth
~28 ft est.
Surface area
388 acres
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Alaska has not published bathymetry for Twentymile Lake.
Lake Size & Watershed
Watershed (drainage) area
35 sq mi
HydroLAKES / HydroSHEDS
Mean depth
~28 ft est.
Modelled from terrain, not sounded
Shoreline
6.9 mi
HydroLAKES / HydroSHEDS
Elevation
404 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Frequently asked questions about Twentymile Lake
Where is Twentymile Lake?
- Twentymile Lake is a lake in Yukon-Koyukuk County, Alaska. Its water-quality measurements are published by Alaska DEC and shown on this page as reported.
What is the water quality of Twentymile Lake?
- Twentymile Lake in Yukon-Koyukuk County, Alaska has water-quality measurements published by Alaska DEC, shown here as reported. Surface area: 388 acres.
Is Twentymile Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Twentymile Lake?
- No published bathymetric survey covers Twentymile Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 28 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 388 acres.
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Where this data comes from
Measurements for Twentymile Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)