Roemhildts Lake
Le Sueur County, MinnesotaMesotrophic
Roemhildts Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.
A TSI near 46 places Roemhildts Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. At 60 ft of maximum depth, Roemhildts Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. The lake is compact at 74 acres, with 1.3 miles of shoreline and little volume to buffer nutrient inputs. Among the 14 graded lakes in Le Sueur County, Roemhildts Lake ranks 2 — in the top quartile locally.
No invasive species are currently listed at Roemhildts Lake — the lake remains off the Minnesota infested-waters roster. Bass fishing is part of the appeal: the species list runs to 13, anchored by largemouth and/or smallmouth bass. Public access is available — the lake is on the Minnesota PCA public-access list. 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 2022-10-12. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10.2 ft. Phosphorus level: 21 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.2 ft | B |
| Phosphorus | 21 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 60 ft |
| Surface Area | 73.54 acres |
| Shoreline Length | 1.3 mi |
| Littoral Zone | 60% |
| Public Access | Yes |
Fish Species
Click a species to see all Minnesota and Wisconsin lakes where it is found.
→ Best fishing times for Roemhildts Lake (14-day solunar calendar)
→ Is it safe to eat fish from Roemhildts Lake? (mercury & PFAS guide)
→ Roemhildts Lake fishing regulations (limits, seasons, special rules)
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.032 m/yr | 3 |
| Phosphorus | ↓ Declining | +15.25 µg/L/yr | 2 |
Location
County Ranking
Ranked #2 of 14 lakes in Le Sueur County
Cleaner Lakes Within 30 Miles
Roemhildts Lake holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Le Sueur County
More Minnesota Lake Rankings
State Parks Near Roemhildts Lake
Other Grade B Lakes in Minnesota
Mesotrophic Lakes in Minnesota
DNR Fisheries Survey Summary
14 surveys on file from MN DNR Fisheries. Most recent: 2022-07-14 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Largemouth Bass | 30.06 | 0.57 lb |
| Bluegill | 26.08 | 0.15 lb |
| Yellow Perch | 8.43 | 0.1 lb |
| IOD | 4.29 | — |
| Hybrid Sunfish | 3.73 | 0.18 lb |
| Black Crappie | 3.35 | 0.29 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.
Largemouth Bass
Bluegill
Yellow Perch
Hybrid Sunfish
From the 2022-07-14 survey
A targeted survey of nearshore fish species in Roemhildts Lake was conducted on July 12, 2022, by DNR Fisheries staff. Ten sampling sites were evenly spaced around the lake, and each was sampled by backpack electrofishing and seining with a 50-foot or 15-foot seine, where possible. Backpack electrofishing was…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Roemhildts Lake. 3 reports on file.
- —Fisheries Lake Survey — RoemhildtsFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Roemhildts (1390)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — RoemhildtsPublic Water Access Sites · MN DNR LakeFinder
EPA Impairment Status
Roemhildts Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN40-0063-00 · Official waterbody report · Matched by proximity (2.19 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
Most recent sample: 2022-10-12
Monitoring stations: 1