Harrison County Lake Quality
Indiana, 1 lake — no lake here has enough monitoring data for a grade
Harrison County holds 1 monitored lake. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. No lake in Harrison County has enough sampling behind it for an A–F grade yet. The 1 monitored lake below carries 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 Harrison County
Planning a trip? Check special fishing regulations for Overflow Pond — or check the official Indiana fishing regulations.
All Lakes in Harrison County
1 lake · 0 graded, 1 not rated0 graded lakes · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NROverflow PondHarrison | 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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Other Counties in Indiana
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.