
Monroe County Lake Quality
Arkansas, 16 lakes — no lake here has enough monitoring data for a grade
There are 16 monitored lakes in Monroe County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. No lake in Monroe County has enough sampling behind it for an A–F grade yet. The 16 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 Monroe County
Planning a trip? Check special fishing regulations for Brinkley Lake — or check the official Arkansas fishing regulations.
All Lakes in Monroe County
16 lakes · 0 graded, 16 not rated0 graded lakes · 16 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRBrinkley LakeMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRCaney SlashMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSandy SloughMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWaters BayouMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRMoon LakeMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRKansas LakeMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRRound PondMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLower Crooked LakeMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRRound LakeMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRGreen LakeMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NREast LakeMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRHorseshoe LakeMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRUpper Old RiverMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRFirst Old RiverMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRMidway LakeMonroe | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRMcCollum LakeMonroe | 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.
Lake Match
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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 Arkansas
See how Monroe 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.