Sibley County Lake Quality
Minnesota, 2 lakes, average grade F (Very Poor)
Only 2 lakes in Sibley 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.
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. Titlow Lake (F) is the cleanest in the county.
Quick Answers for Sibley County
Planning a trip? Check special fishing regulations for Titlow Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.
All Lakes in Sibley County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Titlow Lake | F | 0.3 ft | - | 208 µg/L |
| 2 | High Island Lake | F | 2.1 ft | 6.5 ft | 180 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.