What is the water quality grade for Rocky River Reservoir?

Rocky River Reservoir in Chatham County, North Carolina received a water quality grade of F (Very Poor). Water clarity: 1.9 ft visibility. Phosphorus: 70 µg/L. Chlorophyll-a (algae): 55.5 µg/L.

Is Rocky River Reservoir safe to swim in?

Avoid swimming, very poor water quality, potential algae toxins. Rocky River Reservoir has an overall water quality grade of F. Algae concentration (chlorophyll-a) is 55.5 µg/L. Always check local health department advisories before swimming.

Chatham County, North Carolina

Rocky River Reservoir

Grade FVery Poor · 1.9 ft clarity

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Eutrophic

Rocky River Reservoir is a productive, nutrient-rich eutrophic lake in Chatham County, North Carolina. Water quality is graded F based on 3 sampling years through 2023. Compared to the 6 other monitored lakes in Chatham County, Rocky River Reservoir ranks #6 for water quality.

Source: EPA Water Quality Portal sampling records, North Carolina DNR, last sampled 2023-09-21. Grade methodology: LakeGrade methodology.

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 1.9 ft of visibility. Phosphorus level: 70 µg/L. Chlorophyll-a: 55.5 µg/L. Trophic State Index: 68.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.9 ft	F
Phosphorus	70 µg/L	D
Chlorophyll-a (Algae)	55.5 µg/L	F
Trophic State Index (TSI)	68	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Rocky River Reservoir

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