What is the water quality grade for Murphy Lake?

Murphy Lake in Lincoln County, Montana received a water quality grade of A (Excellent). Phosphorus: 6.5 µg/L. Chlorophyll-a (algae): 1.8 µg/L.

Is Murphy Lake safe to swim in?

Excellent for swimming, crystal clear water with minimal algae. Murphy Lake has an overall water quality grade of A. Algae concentration (chlorophyll-a) is 1.8 µg/L. Always check local health department advisories before swimming.

Lincoln County, Montana · 48.73°N

Murphy Lake

Grade AExcellent water quality

Find places to stay →

Oligotrophic

Murphy Lake is a cold, clear oligotrophic lake in Lincoln County, Montana. Water quality is graded A based on 2 sampling years through 2023. Compared to the 25 other monitored lakes in Lincoln County, Murphy Lake ranks #14 for water quality.

Source: EPA Water Quality Portal sampling records, Montana DNR, last sampled 2023-07-18. Grade methodology: LakeGrade methodology.

Watch Murphy Lake water quality

Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

No clarity data. Phosphorus level: 6.5 µg/L. Chlorophyll-a: 1.8 µg/L. Trophic State Index: 34.

Metric	Value	Grade
Water Clarity (Secchi Depth)	No data
Phosphorus	6.5 µg/L	A
Chlorophyll-a (Algae)	1.8 µg/L	A
Trophic State Index (TSI)	34	Oligotrophic

Low nutrients, clear water, excellent for swimming

Where to stay near Murphy Lake

Compare lakeside cabins, hotels, and vacation rentals near Murphy Lake in Lincoln 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 Murphy Lake