| Station Name | Station ID | Map | Most Recent Data | Reports |
| Manchester Hill Park Pond | 10058818 |
Map
| 2024 |
Details
|
| Menomonee Park Quarry Lake - Center | 10030397 |
Map
| 2020 |
Details
|
| Merton Lake - Merton Lake | 684003 |
Map
| 1979 |
Details
|
| Middle Genesee Lake | 10021959 |
Map
| 2019 |
Details
|
| Middle Genesee Lake - Deepest Spot | 683253 |
Map
| 2017 |
Details
|
| Monterey Pond - Center | 684004 |
Map
| 1979 |
Details
|
| Moose Lake - Deep Hole | 683168 |
Map
| 2025 |
Details
|
| Mukwonago Park Pond | 683345 |
Map
| 1994 |
Details
|
| Muskego (Big Muskego) Lake - Outlet Near Wind Lake | 643555 |
Map
| 2022 |
Details
|