Amoeber Lake
Lake County, MinnesotaLimited DataOligotrophic
Amoeber Lake earns an A — every scored parameter (clarity) rates among the best monitored waters in Lake County.
A TSI value of 35 puts Amoeber Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. At 110 ft of maximum depth, Amoeber Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. Amoeber Lake covers 410 acres alongside 10.1 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Amoeber Lake ranks 22 of 142 in Lake County, putting it in the upper tier of locally monitored lakes.
No invasive species are currently listed at Amoeber Lake — the lake remains off the Minnesota infested-waters roster. The fishery is bass-led, with 4 documented species across the lake's records. No formal public access is documented at Amoeber 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 2023-07-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 18 ft down. Trophic State Index: 35.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 110 ft |
| Surface Area | 409.8 acres |
| Shoreline Length | 10.1 mi |
| Littoral Zone | 26% |
| Public Access | No |
Fish Species
Click a species to see all Minnesota and Wisconsin lakes where it is found.
→ Best fishing times for Amoeber Lake (14-day solunar calendar)
→ Is it safe to eat fish from Amoeber Lake? (mercury & PFAS guide)
→ Amoeber Lake fishing regulations (limits, seasons, special rules)
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.092 m/yr | 4 |
Location
County Ranking
Ranked #22 of 142 lakes in Lake County
Nearby Lakes in Lake County
More Minnesota Lake Rankings
Other Grade A Lakes in Minnesota
Oligotrophic Lakes in Minnesota
DNR Fisheries Survey Summary
4 surveys on file from MN DNR Fisheries. Most recent: 2025-08-01 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Tullibee (Cisco) | 37.52 | 0.32 lb |
| CIS | 32.70 | 0.27 lb |
| BUB | 2.67 | 1.21 lb |
| Lake Trout | 1.27 | 6.04 lb |
| Smallmouth Bass | 0.80 | 0.21 lb |
| Walleye | 0.67 | 2.38 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
BUB
Lake Trout
Smallmouth Bass
From the 2025-08-01 survey
Temperature and dissolved oxygen measurements were collected from the deepest basin in Amoeber Lake on August 1st, 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 (Cisco,…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Amoeber Lake. 1 report on file.
- —Fisheries Lake Survey — AmoeberFisheries Lake Survey · MN DNR LakeFinder
EPA Impairment Status
Amoeber Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MN38-0227-00 · Official waterbody report
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: 2023-07-20
Monitoring stations: 4