Florence County Lake Quality
Wisconsin, 39 lakes, average grade B (Good)
There are 39 graded lakes in Florence County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Bass Lake (B) is the cleanest in the county.
Where to stay near Florence County
Top-rated places to stay near Florence County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Florence County?
Get lake water-quality report cards plus the best cabin & lodging deals near Florence County — straight to your inbox. No spam, unsubscribe anytime.
Quick Answers for Florence County
Planning a trip? Check special fishing regulations for Bass Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
Fishing in Florence County
DNR Reports (18)
Wisconsin DNR Fisheries Survey resources for lakes in Florence County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2025Spread Eagle Chain panfish regulation assessment survey, 2025Panfish Survey · WI DNR · 2025 (PDF)
- 2024Brule River Flowage comprehensive/creel survey, 2024Comprehensive Survey · WI DNR · 2024 (PDF)
- 2024Fay Lake spring summary report, 2024Fisheries Survey · WI DNR · 2024 (PDF)
- 2024Halsey Lake comprehensive survey, 2024Comprehensive Survey · WI DNR · 2024 (PDF)
- 2024Patten Lake comprehensive survey, 2024Comprehensive Survey · WI DNR · 2024 (PDF)
- 2023Long Lake comprehensive survey, 2023Comprehensive Survey · WI DNR · 2023 (PDF)
- 2023Spread Eagle Chain comprehensive survey, 2023Comprehensive Survey · WI DNR · 2023 (PDF)
- 2022Bush Lake panfish netting survey, 2022Netting Survey · WI DNR · 2022 (PDF)
- 2022East Bass Lake shocking and netting survey, 2022Netting Survey · WI DNR · 2022 (PDF)
- 2022Ellwood Lake shocking and netting survey, 2022Netting Survey · WI DNR · 2022 (PDF)
- 2022Sand Lake shocking and netting survey, 2022Netting Survey · WI DNR · 2022 (PDF)
- 2022West Bass Lake shocking and netting survey, 2022Netting Survey · WI DNR · 2022 (PDF)
- 2021Fisher Lake spring shocking survey, 2021Spring Shocking Survey · WI DNR · 2021 (PDF)
- 2021Patten Lake fisheries summary report, 2021Fisheries Survey · WI DNR · 2021 (PDF)
- 2018Spread Eagle Chain comprehensive survey 2018Comprehensive Survey · WI DNR · 2018 (PDF)
- 2016Brule River Flowage fisheries summary report, 2016Fisheries Survey · WI DNR · 2016 (PDF)
- 2016Keyes Lake fisheries summary report, 2016Fisheries Survey · WI DNR · 2016 (PDF)
- 2016Twin Falls Flowage comprehensive survey 2016Comprehensive Survey · WI DNR · 2016 (PDF)
All Lakes in Florence County
39 lakes · 12 graded, 27 not rated12 graded lakes · 27 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | BBass LakeFlorence | B | 12 ft | 11.6 µg/L | No recent samples | No recent samples | 16 ft | Not recorded |
| 2 | BHalsey LakeFlorence | B | 6.5 ft | 18 µg/L | No recent samples | No recent samples | 10 ft | ✓ Public |
| 3 | BFrog LakeFlorence | B | 9.5 ft | 16.2 µg/L | No recent samples | No recent samples | No recent samples | Not recorded |
| 4 | BReisner LakeFlorence | B | 6.5 ft | 18.1 µg/L | No recent samples | No recent samples | 5 ft | Not recorded |
| 5 | BFay LakeFlorence | B | 7 ft | 15.5 µg/L | No recent samples | No recent samples | 10 ft | ✓ Public |
| 6 | BSea Lion LakeFlorence | B | 21 ft | 11.5 µg/L | No recent samples | No recent samples | 82 ft | ✓ Public |
| 7 | BEllwood LakeFlorence | B | 13 ft | 12 µg/L | No recent samples | No recent samples | 25 ft | ✓ Public |
| 8 | BKeyes LakeFlorence | B | 21 ft | 11.4 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public |
| 9 | BLost LakeFlorence | B | 10.6 ft | 13 µg/L | No recent samples | No recent samples | 45 ft | ✓ Public |
| 10 | BPorcupine LakeFlorence | B | 11 ft | 13.4 µg/L | No recent samples | No recent samples | 20 ft | Not recorded |
| 11 | BPatten LakeFlorence | B | 10.2 ft | 15 µg/L | No recent samples | No recent samples | 52 ft | ✓ Public |
| 12 | CLong LakeFlorence | C | 7.9 ft | 25.2 µg/L | No recent samples | No recent samples | 21 ft | ✓ Public |
| NRMirror LakeFlorence | NR | 8.5 ft | No recent samples | No recent samples | No recent samples | 13 ft | ✓ Public | |
| NRNorth LakeFlorence | NR | 15 ft | No recent samples | No recent samples | No recent samples | 43 ft | ✓ Public | |
| NREmily LakeFlorence | NR | 8.3 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLoon LakeFlorence | NR | 16.8 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSand LakeFlorence | NR | 12.2 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRSand LakeFlorence | NR | 10.8 ft | No recent samples | No recent samples | No recent samples | 28 ft | ✓ Public | |
| NRWest LakeFlorence | NR | 12 ft | No recent samples | No recent samples | No recent samples | 25 ft | Not recorded | |
| NRFisher LakeFlorence | NR | 8.2 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NREast Bass LakeFlorence | NR | 17.8 ft | No recent samples | No recent samples | No recent samples | 42 ft | ✓ Public | |
| NRFischer LakeFlorence | NR | 5.5 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRMorgan LakeFlorence | NR | 8.6 ft | No recent samples | No recent samples | No recent samples | 10 ft | ✓ Public | |
| NRScout LakeFlorence | NR | 14.2 ft | No recent samples | No recent samples | No recent samples | 26 ft | ✓ Public | |
| NRLong Lake -Spread Eagle ChainFlorence | NR | 13.5 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWest Lake -Spread Eagle ChainFlorence | NR | 9.5 ft | No recent samples | No recent samples | No recent samples | 68 ft | Not recorded | |
| NRCosgrove LakeFlorence | NR | 9.4 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRMontgomery LakeFlorence | NR | 6.8 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRSealion LakeFlorence | NR | 25.6 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRBarrens LakeFlorence | NR | 13.1 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRNorth Lake -Spread Eagle ChainFlorence | NR | 14.5 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake of DreamsFlorence | NR | 10.2 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRSeidel LakeFlorence | NR | 7.3 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLittle Cosgrove LakeFlorence | NR | 8.6 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRTwin Falls Flowage Us Twin Falls Dam LakeFlorence | NR | 7 ft | No recent samples | No recent samples | No recent samples | 50 ft | ✓ Public | |
| NRLake AnnaFlorence | NR | 20.5 ft | No recent samples | No recent samples | No recent samples | 61 ft | ✓ Public | |
| NRMiddle Lake -Spread Eagle ChainFlorence | NR | 14.4 ft | No recent samples | No recent samples | No recent samples | 54 ft | Not recorded | |
| NRBush LakeFlorence | NR | 8.1 ft | No recent samples | No recent samples | No recent samples | 18 ft | ✓ Public | |
| NRWest Bass LakeFlorence | NR | 14.4 ft | No recent samples | No recent samples | No recent samples | 19 ft | ✓ Public |
NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in Wisconsin
See how Florence County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.