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B

Fay Lake

Florence County, WisconsinMesotrophic

Fay Lake comes in at a B on the grading rubric — a respectable showing for a Wisconsin lake of its size and depth. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Wisconsin norms.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. A maximum depth of just 10 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. At 272 acres, Fay Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Fay Lake ranks 16 of 39 in Florence County — solidly in the upper half of the local distribution.

An invasive species record — Banded Mystery Snail — has been logged at Fay Lake; Wisconsin DNR maintains the official infested-waters list. The fishery includes walleye alongside the lake's other 4 documented species — a notable draw for Wisconsin anglers. A documented public access point at Fay Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. 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, Wisconsin DNR Surface Water, last sampled 2025-08-25. Grade methodology: LakeGrade methodology.

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Moderate clarity, visible to about 7 ft. Phosphorus level: 15.5 µg/L. Trophic State Index: 46.

MetricValueGrade
Water Clarity (Secchi Depth)7 ftC
Phosphorus15.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)46Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth10 ft
Surface Area272 acres
Public AccessYes

Fish Species

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

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

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

Fay 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.

Banded Mystery SnailChinese Mystery Snail

Water Quality Trend: Declining

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.324 m/yr6
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #16 of 39 lakes in Florence County

Cleaner Lakes Within 30 Miles

Fay Lake holds Grade B. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Florence County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2006. 1 station on file (most recent sample 2025).

Fish Species (DNR-rated)

Largemouth Bass(Common)Northern Pike(Common)Panfish(Present)Walleye(Present)

Data Sources

Water quality data from the EPA Water Quality Portal

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: 2025-08-25

Monitoring stations: 1

Where to stay near Fay Lake

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

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