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LakeQuality
D

Buffalo Lake

Wright County, MinnesotaEutrophic

Buffalo Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. The lake bottoms out at 33 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Buffalo Lake covers 1,552 acres alongside 6.3 miles of shoreline, large enough that conditions can vary meaningfully between bays. Within Wright County's 64 graded lakes, Buffalo Lake ranks 44 — below the local median, though not at the bottom.

Buffalo 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 Buffalo Lake, one of 20 fish species on record for the lake. A documented public access point at Buffalo Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 18 observed ice-outs, centered near Apr 4. 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 2024-10-04. Grade methodology: LakeGrade methodology.

Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 3 ft of visibility. Phosphorus level: 47 µg/L. Trophic State Index: 61.

MetricValueGrade
Water Clarity (Secchi Depth)3 ftF
Phosphorus47 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)61Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth33 ft
Average Depth14.7 ft
Surface Area1.6K acres
Shoreline Length6.3 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 Buffalo Lake (14-day solunar calendar)

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

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

Invasive Species

Eurasian watermilfoilzebra mussel

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.121 m/yr5
Phosphorus Improving-28.75 µg/L/yr3

Ice Season

Historical ice data from Minnesota DNR (28 observations).

Typical Ice-Out
Apr 4
Typical Ice-In
Nov 30

Estimated open water season: 240 days

EarliestLatest
Ice-Out2017-03-07 (2017)2018-05-02 (2018)
Ice-In1986-11-13 (1986)2018-12-19 (2018)

Most recent ice-out: 2025-03-24

Location

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County Ranking

Ranked #44 of 64 lakes in Wright County

Nearby Lakes in Wright County

State Parks Near Buffalo Lake

DNR Fisheries Survey Summary

20 surveys on file from MN DNR Fisheries. Most recent: 2025-10-10 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Fathead Minnow41.11
Black Bullhead36.530.58 lb
Walleye35.771.48 lb
Bluegill34.000.2 lb
Yellow Perch29.460.17 lb
BKS25.44

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.

Black Bullhead

14 fish · 413 in · 2024-07-22
53045678910111213

Walleye

29 fish · 724 in · 2025-10-10
1050trophy 2481012141618202224

Bluegill

179 fish · 28 in · 2024-07-22
492502345678

Yellow Perch

494 fish · 311 in · 2024-07-22
2041020trophy 1234567891011

From the 2025-10-10 survey

Buffalo Lake is a 1,552-acre general development lake located within the City of Buffalo in Wright County and is within the North Fork Crow River watershed. The lake has a maximum depth of 33 feet with an average depth of 15 feet, but poor water quality with a 10-yr average summer water clarity of three feet. Walleye…

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 Buffalo 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

Ice data from Minnesota DNR Climate

Most recent sample: 2024-10-04

Monitoring stations: 1