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LakeQuality
B

Jackson Lake

Clearwater County, MinnesotaMesotrophic

On the LakeGrade scale Jackson Lake grades a B, with clarity at 8.9 ft and 16 µg/L of phosphorus placing it above the Minnesota median. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Minnesota norms.

Mesotrophic conditions dominate at Jackson Lake: 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. Jackson Lake sits at rank 28 of 40 in Clearwater County, in the lower half of the local distribution.

No invasive species are currently listed at Jackson Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Jackson Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Jackson Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. 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 2025-09-05. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 8.9 ft. Phosphorus level: 15.5 µg/L. Trophic State Index: 45.

MetricValueGrade
Water Clarity (Secchi Depth)8.9 ftC
Phosphorus15.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)45Mesotrophic

Moderate nutrients, good water quality

Location

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County Ranking

Ranked #28 of 40 lakes in Clearwater County

Nearby Lakes in Clearwater County

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Jackson Lake. 2 reports on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-09-05

Monitoring stations: 2