Cooper Lake is a productive, nutrient-rich eutrophic lake in Delta County, Texas. Water quality is graded C based on 2 sampling years through 2025. Compared to the 2 other monitored lakes in Delta County, Cooper Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2025-09-10. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swim with caution, moderate algae may be present
Water Quality Grade: C, Fair
Very murky, less than 2.4 ft of visibility. Phosphorus level: 50 µg/L. Chlorophyll-a: 28.6 µg/L. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.4 ft | F |
| Phosphorus | 50 µg/L | C |
| Chlorophyll-a (Algae) | 28.6 µg/L | D |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Cooper Lake
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Fishing Cooper Lake
Location
County Ranking
Ranked #1 of 3 lakes in Delta County
Nearby Lakes in Delta County
Explore Cooper Lake across LakeGrade
More Texas Lake Rankings
Other Grade C Lakes in Texas
Eutrophic Lakes in Texas
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: 2025-09-10
Monitoring stations: 1