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Bass Lake: Northwest Basin

Beltrami County, MinnesotaMesotrophic

Bass Lake: Northwest Basin sits at the top of the Minnesota PCA grading rubric with an A, a mark reached by the cleanest lakes in Minnesota. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Mesotrophic conditions dominate at Bass Lake: Northwest Basin: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Within Beltrami County's 95 graded lakes, Bass Lake: Northwest Basin ranks 50 — below the local median, though not at the bottom.

No invasive species are currently listed at Bass Lake: Northwest Basin — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Bass Lake: Northwest Basin, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-10. Grade methodology: LakeGrade methodology.

Watch Bass Lake: Northwest Basin water quality

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Good clarity, visible to about 11 ft. Phosphorus level: 12 µg/L. Trophic State Index: 41.

MetricValueGrade
Water Clarity (Secchi Depth)11 ftB
Phosphorus12 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)41Mesotrophic

Moderate nutrients, good water quality

Water Quality Trend: Declining

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.543 m/yr6
Phosphorus Declining+0.97 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #50 of 95 lakes in Beltrami County

Nearby Lakes in Beltrami County

State Parks Near Bass Lake: Northwest Basin

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-09-10

Monitoring stations: 1

Where to stay near Bass Lake: Northwest Basin

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