Marinette County Lake Quality
Wisconsin, 21 lakes, average grade B (Good)
There are 21 graded lakes in Marinette 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.
A meaningful share of Marinette's lakes break 50 feet of depth, which matters because deep lakes hold cooler water all summer and resist the resuspended-sediment problems that plague shallow basins. The county's best-graded lake is Eagle Lake (A).
Quick Answers for Marinette County
Planning a trip? Check special fishing regulations for Eagle Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
DNR Reports (19)
Wisconsin DNR Fisheries Survey resources for lakes in Marinette County. Showing 12 most recent — browse all reports →
- 2022Gilas Lake comprehensive survey, 2022Comprehensive Survey · WI DNR · 2022 (PDF)
- 2021Hilbert Lake comprehensive survey, 2021Comprehensive Survey · WI DNR · 2021 (PDF)
- 2020Timms Lake fishery summary, 2020Fisheries Survey · WI DNR · 2020 (PDF)
- 2018Eagle Creek Trend survey, 2018Fisheries Survey · WI DNR · 2018 (PDF)
- 2018Grand Rapids Flowage electrofishing survey, 2018Fisheries Survey · WI DNR · 2018 (PDF)
- 2018High Falls Flowage comprehensive survey, 2018Comprehensive Survey · WI DNR · 2018 (PDF)
- 2018KC Creek trout trend survey, 2018Trout Survey · WI DNR · 2018 (PDF)
- 2018North Branch Pike River trout trend survey, 2018Trout Survey · WI DNR · 2018 (PDF)
- 2018Upper Middle Inlet trout trend survey, 2018Trout Survey · WI DNR · 2018 (PDF)
- 2017Big Quinnesec Flowage electrofishing survey, 2017Fisheries Survey · WI DNR · 2017 (PDF)
- 2017North Branch Beaver Creek Trend survey 2017Fisheries Survey · WI DNR · 2017 (PDF)
- 2016Glen Lake electrofishing survey, 2016Fisheries Survey · WI DNR · 2016 (PDF)
All Lakes in Marinette County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Eagle Lake | A | 15 ft | 30 ft | - |
| 2 | Thunder Lake | A | 18 ft | 62 ft | 10.3 µg/L |
| 3 | Lost Lake | A | - | 18 ft | 13.3 µg/L |
| 4 | Gilas Lake | A | 15 ft | 88 ft | 12.6 µg/L |
| 5 | Big Newton Lake | A | 17 ft | 40 ft | 10.4 µg/L |
| 6 | Smith Lake | A | - | 11 ft | 15.6 µg/L |
| 7 | King Lake | A | - | 70 ft | 9 µg/L |
| 8 | Little Mccall Lake | A | - | 21 ft | 13.8 µg/L |
| 9 | Little Newton Lake | A | 10.5 ft | 53 ft | 12.8 µg/L |
| 10 | Hilbert Lake | A | 12 ft | 32 ft | 13.1 µg/L |
| 11 | Lake Noquebay | B | 7.3 ft | 51 ft | 19.4 µg/L |
| 12 | Mary Lake | B | 9 ft | 38 ft | 13.5 µg/L |
| 13 | Town Corner Lake | B | 9.7 ft | 9 ft | 15 µg/L |
| 14 | Shannon Lake | B | 7.5 ft | 37 ft | 18.5 µg/L |
| 15 | Oneonta Lake | B | 7.5 ft | 24 ft | 13.6 µg/L |
| 16 | Montana Lake | B | 8 ft | 28 ft | 17.5 µg/L |
| 17 | High Falls Reservoir at | C | 9.5 ft | 54 ft | - |
| 18 | Yankee Lake | C | 3 ft | 20 ft | 26.5 µg/L |
| 19 | Bass Lake | D | 3.5 ft | 65 ft | - |
| 20 | Caldron Falls Reservoir | D | 5.2 ft | 40 ft | - |
| 21 | Sandstone Flowage Lake | D | 5.5 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.