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Buffalo Lake

Oneida County, WisconsinLimited DataOligotrophic

Buffalo Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Oneida County. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Trophically, Buffalo Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. Buffalo Lake reaches 27 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 105 acres, Buffalo Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Within Oneida County's 134 graded waters, Buffalo Lake sits at rank 17, near the top of the local distribution.

Buffalo Lake has at least one documented invasive species (Chinese Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. Walleye are documented at Buffalo Lake, one of 4 fish species on record for the lake. Public access is available — the lake is on the Wisconsin DNR public-access list. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-06. Grade methodology: LakeGrade methodology.

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 15 ft down. Trophic State Index: 38.

MetricValueGrade
Water Clarity (Secchi Depth)15 ftA
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)38Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth27 ft
Surface Area105 acres
Public AccessYes

Fish Species

Click a species to see every graded lake where it is documented.

→ 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 & Introduced Species

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

Chinese Mystery SnailPurple Loosestrife

Water Quality Trend: Improving

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.643 m/yr3

Recreation & Access

4
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #17 of 134 lakes in Oneida County

Nearby Lakes in Oneida County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).

Fish Species (DNR-rated)

Panfish(Common)Walleye(Common)Largemouth Bass(Present)Smallmouth Bass(Present)

EPA Impairment Status

Buffalo Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Nutrients (phosphorus, nitrogen)

Source: EPA ATTAINS assessment unit WI10007405 · Official waterbody report · Matched by proximity (2.89 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

Fish and recreation data from Wisconsin DNR Lakes

Public boat-access points from the USGS National Boat Ramps inventory

Most recent sample: 2025-08-06

Monitoring stations: 1

Where to stay near Buffalo Lake

Compare lakeside cabins, hotels, and vacation rentals near Buffalo Lake in Oneida County, Wisconsin — live availability and prices for your trip.

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