
Calhoun County Lake Quality
Texas, 12 lakes — no lake here has enough monitoring data for a grade
Calhoun County holds 12 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. No lake in Calhoun County has enough sampling behind it for an A–F grade yet. The 12 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.
Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.
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Quick Answers for Calhoun County
Planning a trip? Check special fishing regulations for Cox Lake — or check the official Texas fishing regulations.
All Lakes in Calhoun County
12 lakes · 0 graded, 12 not rated0 graded lakes · 12 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRCox LakeCalhoun | NR | 0.7 ft | 303 µg/L | 15.8 µg/L | No recent samples | ✓ Public | |
| NRRaw Water LakeCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRDredge Spoil LakeCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NROld Town LakeCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRJones BayouCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRGreen LakeCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRBuffalo LakeCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRAlligator Slide LakeCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRGoff BayouCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRShell Reef BayouCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRBig Brundrett LakeCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRBlind BayouCalhoun | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Texas
See how Calhoun County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.