Barton County Lake Quality
Wisconsin, 6 lakes, average grade F (Very Poor)
Only 6 lakes in Barton 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 average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 Lamar City Lk. Nr. Dam Lake (F); the most-stressed is Lamar City Lk. Nr. Upper End Lake (F).
Quick Answers for Barton County
Planning a trip? Check special fishing regulations for Lamar City Lk. Nr. Dam Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Barton County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Lamar City Lk. Nr. Dam Lake | F | 2 ft | - | 66 µg/L |
| 2 | Lamar City Lk. W of Se 30th Ln Lake | F | 1.5 ft | - | 73.3 µg/L |
| 3 | Lamar City Lk. East Arm Lake | F | 1.9 ft | - | 72.3 µg/L |
| 4 | Lamar City Lk. South Arm Lake | F | 2.1 ft | - | 80.4 µg/L |
| 5 | Lamar City Lk. Up Northern Arm Lake | F | 1.8 ft | - | 78 µg/L |
| 6 | Lamar City Lk. Nr. Upper End Lake | F | 1.8 ft | - | 105.7 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.