Amoeber Lake
Lake County, MinnesotaLimited DataOligotrophic
Amoeber Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Lake County. 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 value of 35 puts Amoeber Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. Amoeber Lake is unusually deep for Minnesota at 110 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. The lake's 410 acres and 10.1 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. 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. Bass fishing is part of the appeal: the species list runs to 4, anchored by largemouth and/or smallmouth bass. No formal public access is documented at Amoeber Lake — most use is by shoreline residents and their guests. 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 2023-07-20. Grade methodology: LakeGrade methodology.
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
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: 2023-07-20
Monitoring stations: 4