Warren County Lake Quality
Missouri, 15 lakes, average grade B (Good)
Warren County's 15 monitored lakes fall in the moderate-density bracket for Missouri. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. 12 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
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 Sherwood Lake (A); the most-stressed is Robin Hood Lake (D).
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Quick Answers for Warren County
Planning a trip? Check special fishing regulations for Sherwood Lake — or check the official Missouri fishing regulations.
All Lakes in Warren County
15 lakes · 12 graded, 3 not rated12 graded lakes · 3 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ASherwood LakeWarren | A | 5.9 ft | 14.3 µg/L | 4.4 µg/L | No recent samples | Not recorded |
| 2 | ALake KonstanzWarren | A | 7.7 ft | 7 µg/L | 1.6 µg/L | No recent samples | Not recorded |
| 3 | AInnsbrook LakeWarren | A | 5.2 ft | 17 µg/L | 5 µg/L | No recent samples | Not recorded |
| 4 | AAlpine LakeWarren | A | 12.6 ft | 7 µg/L | 1.5 µg/L | No recent samples | Not recorded |
| 5 | ACastlenovo LakeWarren | A | 6 ft | 16.8 µg/L | 2.9 µg/L | No recent samples | Not recorded |
| 6 | AAspen Lake Along Southern ArmWarren | A | 3.8 ft | 20.8 µg/L | 5.3 µg/L | No recent samples | Not recorded |
| 7 | AWhippoorwill LakeWarren | A | 5 ft | 13.8 µg/L | 3 µg/L | No recent samples | Not recorded |
| 8 | BLake LucernWarren | B | 5.2 ft | 25.8 µg/L | 10.1 µg/L | No recent samples | Not recorded |
| 9 | CSugar Hollow LakeWarren | C | 3.3 ft | 38 µg/L | 15.4 µg/L | No recent samples | Not recorded |
| 10 | CRed Fox LakeWarren | C | 3.3 ft | 40 µg/L | 10.3 µg/L | No recent samples | Not recorded |
| 11 | CLake EleanorWarren | C | 3 ft | 45 µg/L | 12.2 µg/L | No recent samples | Not recorded |
| 12 | DRobin Hood LakeWarren | D | 3 ft | 58 µg/L | 20.7 µg/L | No recent samples | Not recorded |
| NRCloverleaf Farm LakeWarren | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRForest LakeWarren | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRIncline Village LakeWarren | 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 Missouri
See how Warren 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.