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

How deep is Big Lake?

Big Lake has a maximum depth of 23 feet and an average depth of 14 feet. The lake covers 536 acres.

Are there boat ramps on Big Lake?

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

Can I fish at Big Lake?

Big 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.

Big Lake

Skagit County, Washington536 acresView map Directions

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

Max depth

23 ft

Bathymetric survey

Area

536 acres

Surface area

Shoreline

6.4 mi

Measured length

Impaired · Dioxins
23 ft max depth
Public access

See the measurements Directions Where to stay

Big Lake in Skagit County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 23 ft. Surface area: 536 acres.

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Big Lake is a 536-acre lake in Skagit County, Washington with a maximum depth of 23 feet (14-foot average). 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 Big Lake is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp

Swimming conditions

No reading

Not rated

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

Whether Big 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 Big Lake

These are the measurements Washington Ecology publishes for Big 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 Big Lake

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

Lake Details

Max depth

23 ft

Average depth

14 ft

Surface area

536 acres

Shoreline

6.4 mi

Public access

Yes

Listed by Washington Ecology

Recreation & Access

Boat Landings

Yes

Public Access

Big LakePublic

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

Stays via Stay22

Stays near Big Lake

Compare lakeside cabins, hotels, and vacation rentals near Big Lake in Skagit 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 Big Lake

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Planning a trip? Cabins and lodging at Big Lake → · more Washington lake trips

Follow Big Lake’s readings

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Fishing Big Lake

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

EPA Impairment Status

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

Causes of impairment

DioxinsMercuryNuisance exotic species

Designated uses not supporting: Drinking water, Aquatic life, Fish consumption.

Source: EPA ATTAINS assessment unit WA17110007000662_001_001 · Official waterbody report

Nearby Lakes in Skagit County

Devils Lake1.7 miView →Cultus Mountain Reservoir2.1 miView →Lake McMurray4.4 miView →Beaver Lake4.7 miView →Sixteen Lake3.7 miView →Clear Lake5.5 miView →

Frequently asked questions about Big Lake

Where is Big Lake?: Big Lake is a lake in Skagit County, Washington. Its water-quality measurements are published by Washington Ecology and shown on this page as reported.
What is the water quality of Big Lake?: Big Lake in Skagit County, Washington has water-quality measurements published by Washington Ecology, shown here as reported. Maximum depth: 23 ft. Surface area: 536 acres.
Is Big Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Big Lake is listed impaired under Clean Water Act §303(d) (IR 5) for dioxins, mercury, nuisance exotic species. Check local advisories before you swim.
How deep is Big Lake?: Big Lake has a maximum depth of 23 feet and an average depth of 14 feet. The lake covers 536 acres.
Are there boat ramps on Big Lake?: Big Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Big Lake. Public access is listed as yes.
Can I fish at Big Lake?: Big 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.