What is the water quality grade for Powers Lake?

Powers Lake in Mountrail County, North Dakota received a water quality grade of C (Fair). Water clarity: 5.6 ft visibility. Chlorophyll-a (algae): 7.9 µg/L. Maximum depth: 9.7 ft. Surface area: 1698.9 acres.

Is Powers Lake safe to swim in?

Generally safe for swimming, moderate water quality. Powers Lake has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 7.9 µg/L. Always check local health department advisories before swimming.

How deep is Powers Lake?

Powers Lake has a maximum depth of 9.7 feet and an average depth of 5.7 feet. The lake covers 1698.9 acres.

What fish are in Powers Lake?

Fish species found in Powers Lake include Northern Pike, Yellow Perch. Powers Lake is located in Mountrail County, North Dakota.

Mountrail County, North Dakota

Powers Lake

Grade CFair · 5.6 ft clarity

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Eutrophic

Powers Lake is a 1,699-acre productive, nutrient-rich eutrophic lake in Mountrail County, North Dakota with a maximum depth of 10 feet (6-foot average). Water quality is graded C based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. The lake supports 2 documented fish species including Northern Pike and Yellow Perch. Compared to the 4 other monitored lakes in Mountrail County, Powers Lake ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2024-05-21. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 5.6 ft. Chlorophyll-a: 7.9 µg/L. Trophic State Index: 52.

Metric	Value	Grade
Water Clarity (Secchi Depth)	5.6 ft	D
Phosphorus	No data
Chlorophyll-a (Algae)	7.9 µg/L	B
Trophic State Index (TSI)	52	Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

Characteristic	Value
Maximum Depth	9.7 ft
Average Depth	5.7 ft
Surface Area	1,699 acres
Shoreline Length	17.3 mi

Where to stay near Powers Lake

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Fish Species

Northern Pike Yellow Perch

Click a species to see every graded lake where it is documented.

Fishing Powers Lake

Water Quality Trend: ↑ Improving

Based on 3 years of monitoring data (2020-2025).

Metric	Trend	Change/Year	Years
Water Clarity	↑ Improving	+0.735 m/yr	3
Chlorophyll-a	→ Stable	+0.5 µg/L/yr	3

Water Temperature

Powers Lake averages about 63°F at the surface in summer, usually warmest in Jul (about 64°F) and coldest in Nov (about 33°F). These are typical values by month — not a live reading.