Minnesota DNR fisheries surveys · latest September 8, 2025
Cottonwood Lake FishingFWater-quality grade F
Minnesota DNR surveys at Cottonwood Lake average 38.44 walleye per unit of sampling effort (CPUE) across 12 surveys. The most recent is a Targeted Survey dated September 8, 2025. Length samples in the latest survey that recorded them ran 6–21 inches. In Lyon County, Minnesota, Cottonwood Lake carries an overall water-quality grade of F. Water clarity averages 1.8 feet of visibility, and the lake has public access. The survey figures on this page are Minnesota DNR's own; the water-quality grade comes from EPA Water Quality Portal samples. Neither is a forecast of today's bite.
Species recorded at Cottonwood Lake
10 species on the Minnesota DNR list for this lake. A species on the list has been recorded here; it does not mean it is catchable today or in every part of the lake.
Stocking at Cottonwood Lake
Minnesota DNR publishes a stocking history for this lake — which species went in, how many, and in which years. Read the years: a lake stocked in one year is not necessarily stocked in the next.
Getting on the water
Minnesota DNR lists the public access sites, including ramp type and parking, in the documents below.
Survey results in full
Minnesota DNR surveys at Cottonwood Lake average 38.44 walleye per unit of sampling effort (CPUE) across 12 surveys. The most recent is a Targeted Survey dated September 8, 2025. Length samples in the latest survey that recorded them ran 6–21 inches.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Cottonwood Lake F from EPA Water Quality Portal chemistry. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
12 surveys on file from MN DNR Fisheries. Most recent: 2025-09-08 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg catch rate (CPUE) | Avg Weight |
|---|---|---|
| Fathead Minnow | 1306.14 | — |
| Black Bullhead | 81.93 | 0.32 lb |
| Walleye | 38.44 | 1.18 lb |
| Yellow Perch | 25.10 | 0.27 lb |
| Green Sunfish | 15.06 | 0.22 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE means more abundant in standardized sampling. This is not a weekly bite report.
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.
Black Bullhead
Walleye
Yellow Perch
Green Sunfish
From the 2025-09-08 survey
A targeted gillnet survey was conducted during early September of 2025 on Cottonwood Lake. We conducted the survey to assess relative abundance and size structure of Northern Pike in Cottonwood Lake. A targeted survey is generally used for sampling a specific kind of fish or time of year (i.e. spawning season, fall…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Cottonwood Lake. 3 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — CottonwoodFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — CottonwoodFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — CottonwoodPublic Water Access Sites · MN DNR LakeFinder
Common questions
What fish are in Cottonwood Lake?
Minnesota DNR surveys at Cottonwood Lake average 38.44 walleye per unit of sampling effort (CPUE) across 12 surveys. The most recent is a Targeted Survey dated September 8, 2025. Length samples in the latest survey that recorded them ran 6–21 inches. Minnesota DNR lists 10 species for the lake in total. Those are survey results, not a catch report: a net set on one date measures what was in that net.
When was Cottonwood Lake last surveyed?
The most recent fisheries survey on file for Cottonwood Lake is dated September 8, 2025. Survey intervals vary by lake and by species; a gap of several years between surveys is normal and does not mean the record is missing.
Is Cottonwood Lake stocked?
Minnesota DNR publishes a stocking history for Cottonwood Lake. It records which species were released, in what numbers and in which years — the source documents are linked further down this page. A lake can be stocked in some years and not others, so read the years rather than assuming an annual release.
Does the water-quality grade tell me how Cottonwood Lake fishes?
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Cottonwood Lake F from EPA Water Quality Portal chemistry. Catch rate is not a swim clearance and is not a weekly bite report.
Before you eat what you catch
A water-quality grade is not a consumption advisory. Mercury and PCB advice for Minnesota waters comes from MDH, and it is issued per species and per size class — a lake can grade well and still carry a meal limit on larger predator fish.
Where to stay near Cottonwood Lake
Top-rated places to stay near Cottonwood Lake
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