Benton County Lake Quality
Arkansas, 13 lakes, average grade D (Nutrient-rich)
Benton County holds 13 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 3 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. On average, Benton 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. Beaver Lake (C) is the cleanest in the county.
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Quick Answers for Benton County
Planning a trip? Check special fishing regulations for Beaver Lake — or check the official Arkansas fishing regulations.
All Lakes in Benton County
13 lakes · 3 graded, 10 not rated3 graded lakes · 10 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | CBeaver LakeBenton | C | 4.6 ft | 23 µg/L | 9.1 µg/L | No recent samples | ✓ Public |
| 2 | FSiloam Springs LakeBenton | F | No recent samples | 70 µg/L | 34.4 µg/L | No recent samples | Not recorded |
| 3 | FCrystal LakeBenton | F | No recent samples | 40 µg/L | 35.3 µg/L | No recent samples | Not recorded |
| NRPartners Lake_spillwayBenton | NR | 7.5 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake AtalantaBenton | NR | 6.5 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSwepco LakeBenton | NR | No recent samples | 70.5 µg/L | 25.5 µg/L | No recent samples | Not recorded | |
| NRLake AnnBenton | NR | No recent samples | 22 µg/L | 5.8 µg/L | No recent samples | Not recorded | |
| NRLake WindsorBenton | NR | No recent samples | 29 µg/L | 9.1 µg/L | No recent samples | ✓ Public | |
| NRLake AvalonBenton | NR | No recent samples | 27 µg/L | 17.5 µg/L | No recent samples | ✓ Public | |
| NRNorwood LakeBenton | NR | No recent samples | 20 µg/L | 8 µg/L | No recent samples | Not recorded | |
| NRLoch Lomond LakeBenton | NR | No recent samples | 20 µg/L | 8.5 µg/L | No recent samples | ✓ Public | |
| NRLake BrittanyBenton | NR | No recent samples | 20 µg/L | 4.8 µg/L | No recent samples | Not recorded | |
| NRLake RayburnBenton | NR | No recent samples | 21 µg/L | 6.6 µg/L | 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 Arkansas
See how Benton 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.