Harrison County Lake Quality
Missouri, 3 lakes, average grade D (Nutrient-rich)
Harrison County holds 3 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. On average, Harrison County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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 Harrison County Lake Intake (D); the most-stressed is Harrison County Lake Intake (D).
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Quick Answers for Harrison County
Planning a trip? Check special fishing regulations for Harrison County Lake Intake — or check the official Missouri fishing regulations.
All Lakes in Harrison County
3 lakes · 1 graded, 2 not rated1 graded lake · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DHarrison County Lake IntakeHarrison | D | 1.7 ft | 66.7 µg/L | 27.6 µg/L | No recent samples | Not recorded |
| NRNorth Bethany City ReservoirHarrison | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRRock House LakeHarrison | 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 Harrison 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.