Wright Patman Lake Site is a productive, nutrient-rich eutrophic lake in Cass County, Texas. Water quality is graded D based on 2 sampling years through 2025.
Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2025-09-15. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 1.8 ft of visibility. Phosphorus level: 84.7 µg/L. Chlorophyll-a: 23.4 µg/L. Trophic State Index: 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | F |
| Phosphorus | 84.7 µg/L | D |
| Chlorophyll-a (Algae) | 23.4 µg/L | D |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Wright Patman Lake Site
Location
County Ranking
Ranked #1 of 1 lakes in Cass County
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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: 2025-09-15
Monitoring stations: 2