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LakeQuality
B

Good Lake

Lake County, MinnesotaLimited DataMesotrophic

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

A TSI near 44 places Good Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's 51 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. At 175 acres, Good Lake fits the Minnesota median for monitored lakes, with 3.3 miles of shoreline. Among the 142 graded lakes in Lake County, Good Lake sits at rank 67, above the county median.

Good Lake has no invasive species recorded in Minnesota state databases as of 2021, though prevention practices still apply at all access points. Walleye are documented at Good Lake, one of 11 fish species on record for the lake. No formal public access is documented at Good Lake — 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 2021-06-26. 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 10 ft. Trophic State Index: 44.

MetricValueGrade
Water Clarity (Secchi Depth)10 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)44Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth51 ft
Surface Area175.22 acres
Shoreline Length3.3 mi
Littoral Zone35%
Public AccessNo

Fish Species

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

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

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

Good 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+0.395 m/yr4

Location

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County Ranking

Ranked #67 of 142 lakes in Lake County

Nearby Lakes in Lake County

DNR Fisheries Survey Summary

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

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Tullibee (Cisco)12.750.42 lb
CIS7.830.16 lb
Northern Pike5.253.64 lb
White Sucker3.112.31 lb
Smallmouth Bass1.331.94 lb
Black Crappie1.250.27 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.

CIS

47 fish · 711 in · 2019-08-06
211107891011

Northern Pike

36 fish · 1631 in · 2019-08-06
7401618202224262830

White Sucker

14 fish · 622 in · 2019-08-06
3206810121416182022

Smallmouth Bass

8 fish · 1118 in · 2019-08-06
420trophy 181112131415161718

From the 2025-08-07 survey

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

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 Good Lake. 1 report 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

Most recent sample: 2021-06-26

Monitoring stations: 3