Middle Blackwater River Lake is a mesotrophic lake in Franklin County, Virginia. Water quality is graded B based on 2 sampling years through 2026. Compared to the 13 other monitored lakes in Franklin County, Middle Blackwater River Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Virginia DNR, last sampled 2026-06-16. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 5.9 ft. Phosphorus level: 20 µg/L. Chlorophyll-a: 5.6 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.9 ft | C |
| Phosphorus | 20 µg/L | B |
| Chlorophyll-a (Algae) | 5.6 µg/L | B |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Middle Blackwater River Lake
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Fishing Middle Blackwater River Lake
Location
County Ranking
Ranked #8 of 14 lakes in Franklin County
Cleaner Lakes Within 30 Miles
Middle Blackwater River Lake holds Grade B. 4 nearby lakes hold higher grades.
- AMouth of Bull Run LakeFranklin County · 3.9 mi · Higher grade (B → A)
- ALower Blackwater River LakeFranklin County · 4.8 mi · Higher grade (B → A)
- ACool Branch LakeFranklin County · 5.7 mi · Higher grade (B → A)
- AConfl. Blackwater River LakeBedford County · 6.4 mi · Higher grade (B → A)
Nearby Lakes in Franklin County
Explore Middle Blackwater River Lake across LakeGrade
More Virginia Lake Rankings
Other Grade B Lakes in Virginia
Mesotrophic Lakes in Virginia
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2026-06-16
Monitoring stations: 1