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LakeQuality
B

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 three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

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.

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.

MetricValueGrade
Water Clarity (Secchi Depth)10.2 ftB
Phosphorus21 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)46Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth60 ft
Surface Area73.54 acres
Shoreline Length1.3 mi
Littoral Zone60%
Public AccessYes

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).

MetricTrendChange/YearYears
Water Clarity Declining-0.032 m/yr3
Phosphorus Declining+15.25 µg/L/yr2

Location

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County Ranking

Ranked #2 of 14 lakes in Le Sueur County

Nearby Lakes in Le Sueur County

DNR Fisheries Survey Summary

14 surveys on file from MN DNR Fisheries. Most recent: 2022-07-14 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Largemouth Bass30.060.57 lb
Bluegill26.080.15 lb
Yellow Perch8.430.1 lb
IOD4.29
Hybrid Sunfish3.730.18 lb
Black Crappie3.350.29 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

101 fish · 316 in · 2022-06-27
27140345678910111213141516

Bluegill

99 fish · 29 in · 2022-06-27
26130trophy 1023456789

Yellow Perch

2 fish · 49 in · 2016-07-05
10456789

Hybrid Sunfish

37 fish · 27 in · 2022-06-27
21110234567

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…

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 Roemhildts Lake. 3 reports on file.

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: 2022-10-12

Monitoring stations: 1