Where is Horseshoe Lake?

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

Are there campgrounds on Horseshoe Lake?

Horseshoe Lake has 1 public campground from USGS The National Map within 5 km, including Obstruction Pass State Park Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.

Horseshoe Lake

San Juan County, Washington70 acresView map Directions

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

Area

70 acres

Surface area

Impaired · Nuisance exotic species

See the measurements Directions Where to stay

Horseshoe Lake in San Juan County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 70 acres.

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Horseshoe Lake is a 70-acre lake in San Juan County, Washington.

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

What Horseshoe Lake is good for

From access and monitoring records, not editorial picks.

Camping1 public campground nearby

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Horseshoe Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nuisance exotic species, nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Whether Horseshoe 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 Horseshoe Lake

These are the measurements Washington Ecology publishes for Horseshoe 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 Horseshoe Lake

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

Lake Details

Surface area

70 acres

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

Recreation & Access

Campgrounds

Public campgrounds near Horseshoe Lake

Obstruction Pass State Park Campground4.0 km

Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes

Stays via Stay22

Stays near Horseshoe Lake

Compare lakeside cabins, hotels, and vacation rentals near Horseshoe Lake in San Juan 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 Horseshoe Lake

Prices for Oct 16–18, 4 adults. Change dates on the map below.

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Follow Horseshoe Lake’s readings

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Fishing Horseshoe Lake

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

EPA Impairment Status

Horseshoe Lake is officially listed as impaired under Clean Water Act §303(d) in the 2018 EPA reporting cycle (IR category 5).

Causes of impairment

Nuisance exotic speciesNutrients (phosphorus, nitrogen)

Designated uses not supporting: Aquatic life.

Source: EPA ATTAINS assessment unit WA17110003000316_001_001 · Official waterbody report

Nearby Lakes in San Juan County

Spencer Lake0.9 miView →Mountain Lake6.3 miView →Hummel Lake4.9 miView →Cascade Lake6.1 miView →Martin Lake5.2 miView →Zyistra Lake—View →

Frequently asked questions about Horseshoe Lake

Where is Horseshoe Lake?: Horseshoe Lake is a lake in San Juan County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.
What is the water quality of Horseshoe Lake?: Horseshoe Lake in San Juan County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Surface area: 70 acres.
Is Horseshoe Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Horseshoe Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nuisance exotic species, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Are there campgrounds on Horseshoe Lake?: Horseshoe Lake has 1 public campground from USGS The National Map within 5 km, including Obstruction Pass State Park Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.