Schubert Lake
St. Louis County, MinnesotaLimited DataEutrophic
Schubert Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer.
Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. A maximum depth of 24 ft puts Schubert Lake in the middle of Minnesota's depth distribution. Schubert Lake covers 212 acres alongside 4.0 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Schubert Lake ranks 167 of 187 in St. Louis County — at the lower end of the locally monitored distribution.
Schubert Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. Walleye are documented at Schubert Lake, one of 9 fish species on record for the lake. The lake lacks a documented public access point, so visitor use is limited. The lake has a partial ice record — 12 observed ice-outs, centered near Apr 26. 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 2024-09-21. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 6.5 ft. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.5 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 24 ft |
| Surface Area | 211.79 acres |
| Shoreline Length | 4 mi |
| Littoral Zone | 66% |
| Public Access | No |
Fish Species
Click a species to see all Minnesota and Wisconsin lakes where it is found.
→ Best fishing times for Schubert Lake (14-day solunar calendar)
→ Is it safe to eat fish from Schubert Lake? (mercury & PFAS guide)
→ Schubert Lake fishing regulations (limits, seasons, special rules)
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.103 m/yr | 4 |
Ice Season
Historical ice data from Minnesota DNR (24 observations).
Estimated open water season: 212 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2024-03-15 (2024) | 2022-05-06 (2022) |
| Ice-In | 2017-11-08 (2017) | 2024-12-03 (2024) |
Most recent ice-out: 2024-03-15
Location
County Ranking
Ranked #167 of 187 lakes in St. Louis County
Cleaner Lakes Within 30 Miles
Schubert Lake holds Grade D. 4 nearby lakes hold higher grades.
Nearby Lakes in St. Louis County
More Minnesota Lake Rankings
Other Grade D Lakes in Minnesota
Eutrophic Lakes in Minnesota
DNR Fisheries Survey Summary
2 surveys on file from MN DNR Fisheries. Most recent: 2003-07-16 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Bluegill | 24.69 | 0.15 lb |
| Largemouth Bass | 11.37 | 0.47 lb |
| Smallmouth Bass | 4.00 | 1.16 lb |
| Yellow Perch | 2.83 | 0.11 lb |
| Rock Bass | 2.39 | 0.47 lb |
| Northern Pike | 1.88 | 1.46 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
Largemouth Bass
Smallmouth Bass
Yellow Perch
From the 2003-07-16 survey
Schubert Lake is a 205 acre lake with 140 (68%) littoral acres and a maximum depth of 24 feet. It is located east of Highway 53 off of CR #815. There is no public back-in boat access, however, the lake is accessible off of CR #815. Primary management is for largemouth bass and smallmouth bass although walleye…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Schubert Lake. 1 report on file.
- —Fisheries Lake Survey — SchubertFisheries 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
Ice data from Minnesota DNR Climate
Most recent sample: 2024-09-21
Monitoring stations: 1