Long Lake is a lake in Bayfield County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.

How deep is Long Lake?

Long Lake has a maximum depth of 9.8 feet. The lake covers 32 acres.

Are there campgrounds on Long Lake?

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

Long Lake

Bayfield County, Wisconsin32 acresView map Directions

No nutrient or algae sampling on record from Wisconsin DNR for this lake.

Max depth

9.8 ft

Bathymetric survey

Area

32 acres

Surface area

Shoreline

1.4 mi

Measured length

Impaired · Mercury
10 ft max depth

See the measurements Directions Where to stay

Long Lake in Bayfield County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Maximum depth: 9.8 ft. Surface area: 32 acres.

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Long Lake is a 32-acre lake in Bayfield County, Wisconsin with a maximum depth of 10 feet.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water. Methodology: how these readings are compared.

What Long 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. Long Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.

Whether Long Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Long Lake

These are the measurements Wisconsin DNR publishes for Long 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 Long Lake

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

Lake Details

Max depth

9.8 ft

Surface area

32 acres

Shoreline

1.4 mi

Recreation & Access

Campgrounds

Public campgrounds near Long Lake

Birch Grove2.7 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 Long Lake

Compare lakeside cabins, hotels, and vacation rentals near Long Lake in Bayfield County, Wisconsin — 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 Long Lake

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Fishing Long Lake

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

EPA Impairment Status

Long Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption.

Source: EPA ATTAINS assessment unit WI10008911 · Official waterbody report

Nearby Lakes in Bayfield County

Siskiwit LakeMesotrophic10 miView →Spider Lake11.6 miView →Nc Cheq Bay Lake10.7 miView →Bladder Lake18 ft clear · Mesotrophic12.7 miView →Finger Lake—View →Camp One Lake—View →

Frequently asked questions about Long Lake

Where is Long Lake?: Long Lake is a lake in Bayfield County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Long Lake?: Long Lake in Bayfield County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Maximum depth: 9.8 ft. Surface area: 32 acres.
Is Long Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Long Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Long Lake?: Long Lake has a maximum depth of 9.8 feet. The lake covers 32 acres.
Are there campgrounds on Long Lake?: Long Lake has 1 public campground from USGS The National Map within 5 km, including Birch Grove. 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.