Culpeper County Lake Quality
Virginia, 2 lakes, average grade C (Fair)
Culpeper County has 2 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. Culpeper County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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. Mountain Run Lake (C) is the cleanest in the county.
Quick Answers for Culpeper County
Planning a trip? Check special fishing regulations for Mountain Run Lake — or check the official Virginia fishing regulations.
All Lakes in Culpeper County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Mountain Run Lake | C | 2.6 ft | 40 µg/L |
| 2 | Lake Culpeper | C | 2 ft | 55 µg/L |
Other Counties in Virginia
See how Culpeper County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near Culpeper County
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Source: EPA National Aquatic Resource Surveys, 2026.