Angle Lake
King County, WashingtonView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Impaired · Pathogens (E. coli, fecal)
- 36 ft max depth
- Public access
- Limited data
Angle Lake in King County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 20 ft visibility.
- Clarity
- 20 ft
- Max depth
- ~36 ft est.
- Trend
- ↓ Declining
- Public access
- Yes
Stays via Stay22
Stays near Angle Lake
Compare lakeside cabins, hotels, and vacation rentals near Angle 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 Angle Lake
Prices for Sep 11–13, 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 →
Watch Angle Lake’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Why Angle Lake has no grade
Angle Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Angle Lake is Not Rated — not an F. Its 20-foot median from 3 readings collected 2018–2023 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by WA Ecology and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
What Angle Lake is good for
From access and monitoring records, not editorial picks.
- Clear water20 ft of visibility
- Boat launch1 documented ramp
Swimming Safety
Not ratedBacteria advisory
The letter is 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.
Water quality measurements for Angle Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 20 ft down. TSI 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 20 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~36 ft est. |
| Average Depth | ~14 ft est. |
| Public Access | Yes |
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
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
Fishing Angle Lake
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.121 m/yr | 3 |
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
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. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Angle Lake?
- Angle Lake in King County, Washington is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 20 ft visibility.
Is Angle Lake safe to swim in?
- The letter is 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.
Explore Angle Lake across LakeQuality
2 documented falls within 22.4 mi, nearest Coal Creek Falls
Species activity outlook by water temperature and season
Where to stay at Washington's top lakes, each with its grade
Washington's cleanest and most-polluted lakes, ranked
More Washington Lake Rankings
Other Lakes in Washington
Oligotrophic Lakes in Washington
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated 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