Sibley County Lake Quality
Minnesota, 2 lakes, average grade D (Nutrient-rich)
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. On average, Sibley County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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. High Island Lake (D) is the cleanest in the county.
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Quick Answers for Sibley County
Planning a trip? Check special fishing regulations for High Island Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Minnesota regulations index.
Fishing in Sibley County
All Lakes in Sibley County
2 lakes2 graded lakes
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | DHigh Island LakeSibley | D | 2.1 ft | 180 µg/L | 14.6 µg/L | No recent samples | 6.5 ft | ✓ Public |
| 2 | FTitlow LakeSibley | F | 0.3 ft | 343 µg/L | 118 µg/L | No recent samples | No recent samples | ✓ Public |
Lake Match
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Other Counties in Minnesota
See how Sibley County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.