Sherman Reservoir is a productive, nutrient-rich eutrophic lake in Sherman County, Nebraska. Water quality is graded C based on 2 sampling years through 2024. Compared to the 1 other monitored lakes in Sherman County, Sherman Reservoir ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Nebraska DNR, last sampled 2024-09-09. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 2.4 ft of visibility. Phosphorus level: 100 µg/L. Chlorophyll-a: 4.4 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.4 ft | F |
| Phosphorus | 100 µg/L | F |
| Chlorophyll-a (Algae) | 4.4 µg/L | B |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Sherman Reservoir
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Fishing Sherman Reservoir
Location
County Ranking
Ranked #2 of 2 lakes in Sherman County
Nearby Lakes in Sherman County
Explore Sherman Reservoir across LakeGrade
More Nebraska Lake Rankings
Other Grade C Lakes in Nebraska
Eutrophic Lakes in Nebraska
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-09
Monitoring stations: 2