Hickory County Lake Quality
Wisconsin, 10 lakes, average grade D (Poor)
Only 10 lakes in Hickory 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. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 2 lakes fall into the F bracket outright.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Pomme de Terre L. Lake (C); the most-stressed is Pomme de Terre Lake (F).
Quick Answers for Hickory County
Planning a trip? Check special fishing regulations for Pomme de Terre L. Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Hickory County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Pomme de Terre L. Lake | C | 4.8 ft | - | 25 µg/L |
| 2 | Pomme de Terre Lake 4.5 Mi. Ab. Dam | C | 5.6 ft | - | 37 µg/L |
| 3 | Pomme de Terre L. Central Arm Lake | D | 3 ft | - | 30.5 µg/L |
| 4 | Pomme de Terre Lake | D | 2.6 ft | - | 39 µg/L |
| 5 | Pomme de Terre Lake | D | 2.8 ft | - | 33 µg/L |
| 6 | Pomme de Terre L. Lake | D | 2.1 ft | - | 26 µg/L |
| 7 | Pomme de Terre Lake @ Cr 306 | D | 1.3 ft | - | 46 µg/L |
| 8 | Pomme de Terre Lake | D | 1.3 ft | - | 67 µg/L |
| 9 | Pomme de Terre Lake | F | 1.2 ft | - | 89 µg/L |
| 10 | Pomme de Terre Lake | F | 1 ft | - | 140 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.