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Floyd Lake

Becker County, MinnesotaMesotrophic

Floyd Lake sits at the top of the Minnesota PCA grading rubric with an A, a mark reached by the cleanest lakes in Minnesota. With clarity and phosphorus scored, the sub-grades cluster within a letter of each other, pointing to stable conditions rather than one specific stressor.

Mesotrophic conditions dominate at Floyd Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake bottoms out at 34 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. With 1,178 acres of surface and 9.7 miles of shoreline, Floyd Lake is a large water by Minnesota standards — recreational pressure is spread across a long shoreline. Within Becker County's 93 graded waters, Floyd Lake sits at rank 20, near the top of the local distribution.

Floyd 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 Floyd Lake, one of 16 fish species on record for the lake. A documented public access point at Floyd Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 24 observed ice-outs, centered near Apr 24. 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 2024-09-29. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Good clarity, visible to about 13 ft. Phosphorus level: 12.5 µg/L. Trophic State Index: 40.

MetricValueGrade
Water Clarity (Secchi Depth)13 ftB
Phosphorus12.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)40Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth34 ft
Surface Area1.2K acres
Shoreline Length9.7 mi
Littoral Zone73%
Public AccessYes

Fish Species

black bullhead,black crappie,bluegill,bowfin (dogfish),brown bullhead,green sunfish,hybrid sunfish,largemouth bass,northern pike,pumpkinseed,rock bass,sunfish,walleye,white sucker,yellow bullhead,yellow perch

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

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

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

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

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

zebra mussel

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Stable+0.013 m/yr5
Phosphorus Declining+0.4 µg/L/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (33 observations).

Typical Ice-Out
Apr 24
Typical Ice-In
Nov 24

Estimated open water season: 214 days

EarliestLatest
Ice-Out2012-03-24 (2012)2013-05-12 (2013)
Ice-In2019-11-07 (2019)2009-12-05 (2009)

Most recent ice-out: 2025-04-07

Location

Loading map…

County Ranking

Ranked #20 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: 2021-06-21 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
BNS217.31
Bluntnose Minnow82.96
Fathead Minnow66.65
MMS49.09
BKF38.26
Bluegill27.160.2 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

217 fish · 29 in · 2021-06-21
107540trophy 1023456789

From the 2021-06-21 survey

Floyd (a.k.a., Big Floyd) Lake is a 1,212-acre lake located in Becker County two miles north of the city of Detroit Lakes. Floyd Lake's shoreline is heavily developed, and the lake receives a high amount of angling pressure and recreational use. Floyd Lake consists of two basins, the shallow larger main basin and the…

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 Floyd Lake. 3 reports on file.

EPA Impairment Status

Floyd Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN03-0387-02 · Official waterbody report · Matched by proximity (0.9 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

Ice data from Minnesota DNR Climate

Most recent sample: 2024-09-29

Monitoring stations: 1