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C

German Lake

Becker County, MinnesotaLimited DataEutrophic

The LakeGrade rubric puts German Lake at a C: clarity readings still being added, 34 µg/L of phosphorus, and a TSI of 55 signal an intermediate trophic state.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. German Lake reaches 38 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. German Lake covers 418 acres alongside 7.6 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within the 93 graded lakes of Becker County, German Lake sits at rank 74, near the bottom of the county list.

Zebra mussel presence at German Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. Walleye are documented at German Lake, one of 14 fish species on record for the lake. A documented public access point at German Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 8 times at German Lake, with a median around Apr 18. 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 2022-09-27. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

No clarity data. Phosphorus level: 34 µg/L. Trophic State Index: 55.

MetricValueGrade
Water Clarity (Secchi Depth)No data
Phosphorus34 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)55Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth38 ft
Surface Area417.57 acres
Shoreline Length7.6 mi
Littoral Zone46%
Public AccessYes

Fish Species

black bullhead,black crappie,bluegill,brown bullhead,hybrid sunfish,largemouth bass,northern pike,pumpkinseed,rock bass,tullibee (cisco),walleye,white sucker,yellow bullhead,yellow perch

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

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

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

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

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

zebra mussel

Ice Season

Historical ice data from Minnesota DNR (10 observations).

Typical Ice-Out
Apr 18
EarliestLatest
Ice-Out2021-04-03 (2021)2022-05-06 (2022)
Ice-In2023-11-25 (2023)2024-11-29 (2024)

Most recent ice-out: 2024-04-06

Location

Loading map…

County Ranking

Ranked #74 of 93 lakes in Becker County

Cleaner Lakes Within 30 Miles

German Lake holds Grade C. 4 nearby lakes hold higher grades.

Nearby Lakes in Becker County

DNR Fisheries Survey Summary

10 surveys on file from MN DNR Fisheries. Most recent: 2022-06-13 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Bluegill25.120.26 lb
Yellow Perch11.030.16 lb
Black Bullhead8.980.39 lb
Largemouth Bass7.601.42 lb
Yellow Bass7.310.61 lb
Tullibee (Cisco)5.801.72 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.

Bluegill

862 fish · 39 in · 2022-06-13
2921460trophy 103456789

Yellow Perch

79 fish · 58 in · 2022-06-13
502505678

Black Bullhead

4 fish · 1012 in · 2022-06-13
320101112

Largemouth Bass

11 fish · 1017 in · 2022-06-13
4201011121314151617

From the 2022-06-13 survey

Buffalo Lake is a 376-acre, class 25 lake located in central Becker County near the community of Richwood. It is long and narrow with one bay extending north to the southern boundary of the White Earth Indian Reservation. Although it lies near the headwaters of the Buffalo River, it is the furthest downstream major…

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 German Lake. 4 reports on file.

EPA Impairment Status

German Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN03-0350-00 · Official waterbody report · Matched by proximity (2.71 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

Ice data from Minnesota DNR Climate

Most recent sample: 2022-09-27

Monitoring stations: 1