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LakeQuality
B

Powell County Lake Quality

Montana, 2 lakes, average grade B (Good)

Only 2 lakes in Powell County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.

Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Elbow Lake (A) is the cleanest in the county.

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All Lakes in Powell County

RankLakeGradeClarityPhosphorus
1Elbow LakeA-10.1 µg/L
2Nla LakeC-115.9 µg/L

See how Powell County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.

Where to stay near Powell County

Top-rated places to stay near Powell County

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Source: EPA National Aquatic Resource Surveys, 2026.