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LakeQuality
B

North Lake 3

Goodhue County, MinnesotaLimited DataEutrophic

North Lake 3 carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

At a TSI of 52, North Lake 3 reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. 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 Goodhue County's 10 graded waters, North Lake 3 sits at rank 1, near the top of the local distribution.

North Lake 3 is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. The state fisheries records do not list documented species for North Lake 3, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at North Lake 3 makes the lake usable for shore fishing, paddle craft, and trailered boats. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-10-02. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

No clarity data. Chlorophyll-a: 8.5 µg/L. Trophic State Index: 52.

MetricValueGrade
Water Clarity (Secchi Depth)No data
PhosphorusNo data
Chlorophyll-a (Algae)8.5 µg/LB
Trophic State Index (TSI)52Eutrophic

High nutrients, frequent algae, reduced clarity

Invasive Species

Eurasian watermilfoilbighead carpflowering rushgrass carpsilver carpzebra mussel

Water Quality Trend: Declining

Based on 7 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-1.775 m/yr3
Phosphorus Declining+6.07 µg/L/yr6
Chlorophyll-a Declining+2.79 µg/L/yr7

Location

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County Ranking

Ranked #1 of 10 lakes in Goodhue County

Nearby Lakes in Goodhue County

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for North Lake 3. 1 report on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-10-02

Monitoring stations: 1