Angle Lake
King County, WashingtonView mapDirections
Washington Ecology publishes the water-quality measurements for Angle Lake. Here is what has been measured.
- Impaired · Pathogens (E. coli, fecal)
- 36 ft max depth
- Public access
- Limited data
Angle Lake in King County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Water clarity: 20 ft visibility.
Angle Lake is a lake in King County, Washington with an estimated average depth of about 36 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, WA Ecology, last sampled 2023-07-02. Methodology: how these readings are compared.
What Angle Lake is good for
From access and monitoring records, not editorial picks.
- Clear water20 ft of visibility
- Boat launch1 documented ramp
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Angle Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pathogens (E. coli, fecal). Check local advisories before you swim.
Whether Angle 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 Angle Lake
These are the measurements Washington Ecology publishes for Angle Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 20 ft down. TSI 34.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 20ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 34 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Angle Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~36 ft est.
Public access
Yes
Listed by Washington Ecology
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Washington has not published bathymetry for Angle Lake.
Lake Size & Watershed
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Surface area
86 acres
HydroLAKES / HydroSHEDS
Shoreline
1.9 mi
HydroLAKES / HydroSHEDS
Elevation
351 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.
Recreation & Access
- Angle Lake ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Angle Lake
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Fishing Angle Lake
Water quality readings over time
3 seasons of samples on record (2018–2023). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening3 years
EPA Impairment Status
Angle Lake is officially listed as impaired under Clean Water Act §303(d) in the 2018 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Recreation.
Source: EPA ATTAINS assessment unit WA17110013001849_001_001 · Official waterbody report
Nearby Lakes in King County
Frequently asked questions about Angle Lake
Where is Angle Lake?
- Angle 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 Angle Lake?
- Angle Lake in King County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Water clarity: 20 ft visibility.
Is Angle Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Angle Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pathogens (E. coli, fecal). Check local advisories before you swim.
How deep is Angle Lake?
- No published bathymetric survey covers Angle Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 36 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Angle Lake?
- Angle Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Angle Lake Park. Public access is listed as yes.
Can I fish at Angle Lake?
- Angle 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 Washington's fish and wildlife agency, so check its current regulations before you go.
Explore Angle Lake across LakeQuality
2 documented falls within 22.4 mi, nearest Coal Creek Falls
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Where this data comes from
3 measurements from 1 monitoring station, 2018–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS3 samples · 2018–2023
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory