Ouachita Parish County Lake Quality
Louisiana, 2 lakes, average grade D (Nutrient-rich)
Ouachita Parish County has 2 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. On average, Ouachita Parish County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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. Bayou Chauvin Northwest of Monroe Lake (D) is the cleanest in the county.
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Quick Answers for Ouachita Parish County
Planning a trip? Check special fishing regulations for Bayou Chauvin Northwest of Monroe Lake — or check the official Louisiana fishing regulations.
All Lakes in Ouachita Parish County
2 lakes · 1 graded, 1 not rated1 graded lake · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DBayou Chauvin Northwest of Monroe LakeOuachita Parish | D | No recent samples | 475 µg/L | No recent samples | No recent samples | Not recorded |
| NRBayou de Siard East of Forest Park LakeOuachita Parish | NR | No recent samples | 50 µg/L | No recent samples | No recent samples | Not recorded |
NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in Louisiana
See how Ouachita Parish County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.