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B

Lake of the Clouds

Lake County, MinnesotaLimited DataMesotrophic

Lake of the Clouds comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth.

A TSI near 41 places Lake of the Clouds in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. At 110 ft of maximum depth, Lake of the Clouds stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. The lake is compact at 29 acres, with 1.5 miles of shoreline and little volume to buffer nutrient inputs. Among the 142 graded lakes in Lake County, Lake of the Clouds sits at rank 67, above the county median.

Lake of the Clouds has no invasive species recorded in Minnesota state databases as of 2022, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Lake of the Clouds, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Lake of the Clouds — most use is by shoreline residents and their guests. 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 2022-07-03. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 12 ft. Trophic State Index: 41.

MetricValueGrade
Water Clarity (Secchi Depth)12 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)41Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth110 ft
Surface Area28.56 acres
Shoreline Length1.5 mi
Littoral Zone49%
Public AccessNo

Water Quality Trend: Declining

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.693 m/yr4
See year-by-year chart →

Location

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County Ranking

Ranked #67 of 142 lakes in Lake County

Nearby Lakes in Lake County

DNR Fisheries Survey Summary

3 surveys on file from MN DNR Fisheries. Most recent: 2025-07-31 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
White Sucker4.330.88 lb
Green Sunfish2.000.1 lb

CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.

From the 2025-07-31 survey

Temperature and dissolved oxygen measurements were collected from the deepest basin in Lake of the Clouds Lake on July 31st, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Trout, the most sensitive coldwater species present in this lake.…

Source: MN DNR LakeFinder Fisheries Lake Survey

DNR Reports & Resources

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

EPA Impairment Status

Lake of the Clouds is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Mercury

Source: EPA ATTAINS assessment unit MN38-0166-00 · Official waterbody report · Matched by proximity (1 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Most recent sample: 2022-07-03

Monitoring stations: 2