Tenr Lake is a productive, nutrient-rich eutrophic lake in Marshall County, Alabama. Water quality is graded B based on 2 sampling years through 2025.
Source: EPA Water Quality Portal sampling records, Alabama DNR, last sampled 2025-10-15. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 5.1 ft. Phosphorus level: 23.5 µg/L. Chlorophyll-a: 12.9 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.1 ft | C |
| Phosphorus | 23.5 µg/L | B |
| Chlorophyll-a (Algae) | 12.9 µg/L | C |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Tenr Lake
Location
County Ranking
Ranked #1 of 1 lakes in Marshall 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: 2025-10-15
Monitoring stations: 1