Montmorency County Lake Quality
Wisconsin, 6 lakes, average grade B (Good)
Only 6 lakes in Montmorency County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. With an average grade of B, Montmorency County sits comfortably above the Michigan median.
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. Avery Lake North Basin; T29nr2e (A) is the cleanest in the county.
Quick Answers for Montmorency County
Planning a trip? Check special fishing regulations for Avery Lake North Basin; T29nr2e, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Montmorency County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Avery Lake North Basin; T29nr2e | A | 27 ft | - | - |
| 2 | Avery Lake | A | 27 ft | - | - |
| 3 | West Twin Lake East Basin; Albert Township | A | 13 ft | - | - |
| 4 | East Twin Lake South Central Basin; Albert Township | A | 10 ft | - | - |
| 5 | West Twin Lake | B | 13 ft | - | - |
| 6 | East Twin Lake | C | 9 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.