Tarrant County Lake Quality
Texas, 3 lakes, average grade C (Fair)
Only 3 lakes in Tarrant County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Marine Creek Lake (B); the most-stressed is Grapevine Reservoir Mid Lake (C).
Quick Answers for Tarrant County
Planning a trip? Check special fishing regulations for Marine Creek Lake — or check the official Texas fishing regulations.
All Lakes in Tarrant County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Marine Creek Lake | B | 3.3 ft | 22.7 µg/L |
| 2 | Grapevine Lake | C | 2.4 ft | 48 µg/L |
| 3 | Grapevine Reservoir Mid Lake | C | 3.1 ft | 33.1 µg/L |
Other Counties in Texas
See how Tarrant County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 17 states.
Where to stay near Tarrant County
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Source: EPA National Aquatic Resource Surveys, 2026.