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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | F |
| Phosphorus | 47 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 33 ft |
| Average Depth | 14.7 ft |
| Surface Area | 1.6K acres |
| Shoreline Length | 6.3 mi |
| Littoral Zone | 49% |
| Public Access | Yes |
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
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.121 m/yr | 5 |
| Phosphorus | ↑ Improving | -28.75 µg/L/yr | 3 |
Ice Season
Historical ice data from Minnesota DNR (28 observations).
Estimated open water season: 240 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2017-03-07 (2017) | 2018-05-02 (2018) |
| Ice-In | 1986-11-13 (1986) | 2018-12-19 (2018) |
Most recent ice-out: 2025-03-24
Location
County Ranking
Ranked #44 of 64 lakes in Wright County
Nearby Lakes in Wright County
More Minnesota Lake Rankings
State Parks Near Buffalo Lake
Other Grade D Lakes in Minnesota
Eutrophic Lakes in Minnesota
DNR Fisheries Survey Summary
20 surveys on file from MN DNR Fisheries. Most recent: 2025-10-10 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Fathead Minnow | 41.11 | — |
| Black Bullhead | 36.53 | 0.58 lb |
| Walleye | 35.77 | 1.48 lb |
| Bluegill | 34.00 | 0.2 lb |
| Yellow Perch | 29.46 | 0.17 lb |
| BKS | 25.44 | — |
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
Walleye
Bluegill
Yellow Perch
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…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Buffalo Lake. 3 reports on file.
- —Fisheries Lake Survey — BuffaloFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — BuffaloFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — BuffaloPublic Water Access Sites · MN DNR LakeFinder
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