What is the water quality grade for Little Bitterroot Lake?

Little Bitterroot Lake in Flathead County, Montana received a water quality grade of A (Excellent). Phosphorus: 3.9 µg/L. Chlorophyll-a (algae): 1.2 µg/L.

Is Little Bitterroot Lake safe to swim in?

Excellent for swimming, crystal clear water with minimal algae. Little Bitterroot Lake has an overall water quality grade of A. Algae concentration (chlorophyll-a) is 1.2 µg/L. Always check local health department advisories before swimming.

Flathead County, Montana · 48.13°N

Little Bitterroot Lake

Grade AExcellent water quality

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Oligotrophic

Little Bitterroot Lake is a cold, clear oligotrophic lake in Flathead County, Montana. Water quality is graded A based on 2 sampling years through 2023. Compared to the 79 other monitored lakes in Flathead County, Little Bitterroot Lake ranks #54 for water quality.

Source: EPA Water Quality Portal sampling records, Montana DNR, last sampled 2023-08-09. Grade methodology: LakeGrade methodology.

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

No clarity data. Phosphorus level: 3.9 µg/L. Chlorophyll-a: 1.2 µg/L. Trophic State Index: 28.

Metric	Value	Grade
Water Clarity (Secchi Depth)	No data
Phosphorus	3.9 µg/L	A
Chlorophyll-a (Algae)	1.2 µg/L	A
Trophic State Index (TSI)	28	Oligotrophic

Low nutrients, clear water, excellent for swimming

Where to stay near Little Bitterroot Lake

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