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Lake of the Woods

Lake of the Woods County, MinnesotaMesotrophic

Lake of the Woods 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.

A TSI near 44 places Lake of the Woods in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. 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 Lake of the Woods County's 11 graded waters, Lake of the Woods sits at rank 1, near the top of the local distribution.

Lake of the Woods 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 Lake of the Woods, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Lake of the Woods 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 2021-09-21. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 15.6 ft down. Phosphorus level: 26 µg/L. Trophic State Index: 44.

MetricValueGrade
Water Clarity (Secchi Depth)15.6 ftA
Phosphorus26 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)44Mesotrophic

Moderate nutrients, good water quality

Invasive Species

spiny waterfleazebra mussel

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Declining-0.246 m/yr3
Phosphorus Improving-0.75 µg/L/yr3

Ice Season

Historical ice data from Minnesota DNR (6 observations).

Typical Ice-Out
May 5
EarliestLatest
Ice-Out1976-04-26 (1976)1996-05-19 (1996)
Ice-In1986-11-11 (1986)1988-11-17 (1988)

Most recent ice-out: 1997-05-06

Location

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County Ranking

Ranked #1 of 11 lakes in Lake of the Woods County

Nearby Lakes in Lake of the Woods County

DNR Reports & Resources

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

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Ice data from Minnesota DNR Climate

Most recent sample: 2021-09-21

Monitoring stations: 1