Lake Gilmer is a productive, nutrient-rich eutrophic lake in Upshur County, Texas. Water quality is graded C based on 2 sampling years through 2025. Compared to the 1 other monitored lakes in Upshur County, Lake Gilmer ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2025-09-29. 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 3 ft of visibility. Phosphorus level: 38 µg/L. Chlorophyll-a: 24.9 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | F |
| Phosphorus | 38 µg/L | C |
| Chlorophyll-a (Algae) | 24.9 µg/L | D |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Gilmer
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Fishing Lake Gilmer
Location
County Ranking
Ranked #2 of 2 lakes in Upshur County
Cleaner Lakes Within 30 Miles
Lake Gilmer holds Grade C. 2 nearby lakes hold higher grades.
- BLake HawkinsWood County · 18.1 mi · Higher grade (C → B)
- CLake Bob SandlinCamp County · 20.9 mi · Higher overall water quality score
Nearby Lakes in Upshur County
Explore Lake Gilmer 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: 2025-09-29
Monitoring stations: 2