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

How deep is Alta Lake?

Alta Lake has a maximum depth of 75 feet. The lake covers 220 acres.

Are there boat ramps on Alta Lake?

Alta Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Alta Lake State Park. Public access is listed as yes.

Can I fish at Alta Lake?

Alta 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.

Are there campgrounds on Alta Lake?

Alta Lake has 1 public campground from USGS The National Map within 5 km, including Alta Lake 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.

Alta Lake

Okanogan County, Washington220 acresView map Directions

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

Max depth

75 ft

Bathymetric survey

Area

220 acres

Surface area

Shoreline

3.2 mi

Measured length

Impaired · Nuisance exotic species
75 ft max depth
Public access

See the measurements Directions Where to stay

Alta Lake in Okanogan County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 75 ft. Surface area: 220 acres.

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Alta Lake is a 220-acre lake in Okanogan County, Washington with a maximum depth of 75 feet. Limited fish-species data available. Public access is available with 1 public boat landing.

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

What Alta Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Camping1 public campground nearby
Deep water75 ft surveyed max depth

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Alta Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.

Whether Alta 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 Alta Lake

These are the measurements Washington Ecology publishes for Alta 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 Alta Lake

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

Lake Details

Max depth

75 ft

Surface area

220 acres

Shoreline

3.2 mi

Public access

Yes

Listed by Washington Ecology

Recreation & Access

Boat Landings

Yes

Public Access

Campgrounds

Alta Lake State ParkPublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

Public campgrounds near Alta Lake

Alta Lake State Park Campground1.2 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 Alta Lake

Compare lakeside cabins, hotels, and vacation rentals near Alta Lake in Okanogan 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 Alta Lake

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Fishing Alta Lake

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

EPA Impairment Status

Alta Lake is officially listed as impaired under Clean Water Act §303(d) in the 2018 EPA reporting cycle (IR category 4C).

Causes of impairment

Nuisance exotic species

Designated uses not supporting: Aquatic life.

Source: EPA ATTAINS assessment unit WA17020008002288_001_001 · Official waterbody report

Nearby Lakes in Okanogan County

Rat Lake12.8 miView →Soap Lake—View →Rufus Woods Lake—View →Leader Lake—View →White Lakes—View →Davis Lake—View →

Frequently asked questions about Alta Lake

Where is Alta Lake?: Alta Lake is a lake in Okanogan County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.
What is the water quality of Alta Lake?: Alta Lake in Okanogan County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 75 ft. Surface area: 220 acres.
Is Alta Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Alta Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
How deep is Alta Lake?: Alta Lake has a maximum depth of 75 feet. The lake covers 220 acres.
Are there boat ramps on Alta Lake?: Alta Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Alta Lake State Park. Public access is listed as yes.
Can I fish at Alta Lake?: Alta 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.
Are there campgrounds on Alta Lake?: Alta Lake has 1 public campground from USGS The National Map within 5 km, including Alta Lake 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.