Where is Halfbreed Lake?

Halfbreed Lake is a lake in Stillwater County, Montana. Its water-quality measurements are published by Montana DEQ and shown on this page as reported.

Halfbreed Lake

Stillwater County, Montana211 acresView map Directions

No nutrient or algae sampling on record from Montana DEQ for this lake.

Area

211 acres

Surface area

Shoreline

4.8 mi

Measured length

Impaired · Salinity / chlorides

See the measurements Directions Where to stay

Halfbreed Lake in Stillwater County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Surface area: 211 acres.

Loading map…

Halfbreed Lake is a 211-acre lake in Stillwater County, Montana.

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

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Halfbreed Lake is listed impaired under Clean Water Act §303(d) (IR 5) for salinity / chlorides. Check local advisories before you swim.

Whether Halfbreed Lake is safe to swim in today is a call for the Montana Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Get alerts for Halfbreed Lake →

Water quality measurements for Halfbreed Lake

These are the measurements Montana DEQ publishes for Halfbreed 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 Halfbreed Lake

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

Lake Details

Surface area

211 acres

Shoreline

4.8 mi

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

Stays via Stay22

Stays near Halfbreed Lake

Compare lakeside cabins, hotels, and vacation rentals near Halfbreed Lake in Stillwater County, Montana — 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 Halfbreed Lake

Prices for Oct 16–18, 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 Montana’s top lakes →

Follow Halfbreed Lake’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Halfbreed Lake

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

EPA Impairment Status

Halfbreed Lake is officially listed as impaired under Clean Water Act §303(d) in the 2021 EPA reporting cycle (IR category 5).

Causes of impairment

Salinity / chlorides

Designated uses not supporting: Drinking water, Aquatic life, Other.

Source: EPA ATTAINS assessment unit MT43F003_030 · Official waterbody report

Nearby Lakes in Stillwater County

Hailstone Lake4.7 miView →Big Lake6.5 miView →Dallmann Lake5.8 miView →Hunter Lake9.2 miView →Emerald Lake—View →Mystic Lake—View →

Frequently asked questions about Halfbreed Lake

Where is Halfbreed Lake?: Halfbreed Lake is a lake in Stillwater County, Montana. Its water-quality measurements are published by Montana DEQ and shown on this page as reported.
What is the water quality of Halfbreed Lake?: Halfbreed Lake in Stillwater County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Surface area: 211 acres.
Is Halfbreed Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Halfbreed Lake is listed impaired under Clean Water Act §303(d) (IR 5) for salinity / chlorides. Check local advisories before you swim.