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Eunice Lake

Becker County, MinnesotaMesotrophic

Eunice Lake sits at the top of the Minnesota PCA grading rubric with an A, a mark reached by the cleanest lakes in Minnesota. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Mesotrophic conditions dominate at Eunice Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake bottoms out at 30 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. The lake's 378 acres and 3.4 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Eunice Lake ranks 25 of 93 in Becker County — solidly in the upper half of the local distribution.

Eunice Lake is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. Walleye are documented at Eunice Lake, one of 17 fish species on record for the lake. A documented public access point at Eunice Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. 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 2024-09-26. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Good clarity, visible to about 13.1 ft. Phosphorus level: 13 µg/L. Trophic State Index: 41.

MetricValueGrade
Water Clarity (Secchi Depth)13.1 ftB
Phosphorus13 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)41Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth30 ft
Surface Area378.45 acres
Shoreline Length3.4 mi
Littoral Zone49%
Public AccessYes

Fish Species

Click a species to see all Minnesota and Wisconsin lakes where it is found.

→ Best fishing times for Eunice Lake (14-day solunar calendar)

→ Is it safe to eat fish from Eunice Lake? (mercury & PFAS guide)

Eunice Lake fishing regulations (limits, seasons, special rules)

Invasive Species

zebra mussel

Water Quality Trend: Declining

Based on 5 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.234 m/yr5
Phosphorus Declining+0.5 µg/L/yr5

Ice Season

Historical ice data from Minnesota DNR (14 observations).

Typical Ice-Out
Apr 22
Typical Ice-In
Nov 22

Estimated open water season: 214 days

EarliestLatest
Ice-Out2012-03-23 (2012)2013-05-10 (2013)
Ice-In2002-11-12 (2002)2009-12-04 (2009)

Most recent ice-out: 2013-05-10

Location

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County Ranking

Ranked #25 of 93 lakes in Becker County

Nearby Lakes in Becker County

DNR Fisheries Survey Summary

12 surveys on file from MN DNR Fisheries. Most recent: 2025-05-22 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
BNS602.68
Bluegill29.690.21 lb
Yellow Perch24.770.28 lb
BKF21.78
IOD19.01
Bluntnose Minnow17.60

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

272 fish · 19 in · 2021-06-14
56280trophy 10123456789

Yellow Perch

8 fish · 510 in · 2021-06-14
3205678910

From the 2025-05-22 survey

Lake Eunice is a 325-acre, Class-31 lake located in Becker County eleven miles southwest of Detroit Lakes. Lake Eunice is positioned directly southeast of Maud Lake, separated by County Highway 22. The lake's shoreline is highly developed and extensive bulrush and emergent vegetation removal has occurred in the last…

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 Eunice Lake. 4 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

Ice data from Minnesota DNR Climate

Most recent sample: 2024-09-26

Monitoring stations: 1