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LakeQuality
B

Moose Lake

Lake County, MinnesotaLimited DataMesotrophic

Moose Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Mesotrophic conditions dominate at Moose Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake's 65 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. With 1,301 acres of surface and 21.5 miles of shoreline, Moose Lake is a large water by Minnesota standards — recreational pressure is spread across a long shoreline. Moose Lake ranks 38 of 142 in Lake County — solidly in the upper half of the local distribution.

Moose Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. Walleye are documented at Moose Lake, one of 10 fish species on record for the lake. A documented public access point at Moose Lake 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 2023-07-21. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 13 ft. Trophic State Index: 40.

MetricValueGrade
Water Clarity (Secchi Depth)13 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)40Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth65 ft
Surface Area1.3K acres
Shoreline Length21.5 mi
Littoral Zone20%
Public AccessYes

Fish Species

Click a species to see all Minnesota and Wisconsin lakes where it is found.

→ Best fishing times for Moose Lake (14-day solunar calendar)

→ Is it safe to eat fish from Moose Lake? (mercury & PFAS guide)

Moose Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.32 m/yr4

Ice Season

Historical ice data from Minnesota DNR (4 observations).

Typical Ice-Out
May 7
EarliestLatest
Ice-Out2025-05-03 (2025)2022-05-10 (2022)
Ice-In1979-12-01 (1979)1979-12-01 (1979)

Most recent ice-out: 2025-05-03

Location

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County Ranking

Ranked #38 of 142 lakes in Lake County

Nearby Lakes in Lake County

DNR Fisheries Survey Summary

13 surveys on file from MN DNR Fisheries. Most recent: 2025-08-07 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Tullibee (Cisco)6.580.3 lb
Bluegill4.190.2 lb
Walleye3.571.42 lb
Northern Pike3.522.38 lb
White Sucker3.302.84 lb
Rock Bass2.410.2 lb

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

Length Distributions

Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.

Tullibee (Cisco)

2 fish · 79 in · 2010-08-23
10789

Bluegill

87 fish · 37 in · 2024-08-05
2513034567

Walleye

99 fish · 728 in · 2024-08-05
1680trophy 24810121416182022242628

Northern Pike

17 fish · 1827 in · 2024-08-05
53018192021222324252627

From the 2025-08-07 survey

Temperature and dissolved oxygen measurements were collected from the deepest basin in Moose Lake on August 7th, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Lake Whitefish, the most sensitive coldwater species present in this lake (Cisco,…

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 Moose Lake. 3 reports on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Ice data from Minnesota DNR Climate

Most recent sample: 2023-07-21

Monitoring stations: 14