Chalkrock Lake is a productive, nutrient-rich eutrophic lake in Cedar County, Nebraska. Water quality is graded C based on 1 sampling years through 2016. Compared to the 1 other monitored lakes in Cedar County, Chalkrock Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Nebraska DNR, last sampled 2016-09-21. 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 3.3 ft of visibility. Chlorophyll-a: 9.3 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.3 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 9.3 µg/L | C |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Location
County Ranking
Ranked #2 of 2 lakes in Cedar County
Nearby Lakes in Cedar County
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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: 2016-09-21
Monitoring stations: 1