What is the water quality grade for Grapevine Reservoir Mid Lake?

Grapevine Reservoir Mid Lake in Tarrant County, Texas received a water quality grade of C (Fair). Water clarity: 3.1 ft visibility. Phosphorus: 33.1 µg/L. Chlorophyll-a (algae): 23.7 µg/L.

Is Grapevine Reservoir Mid Lake safe to swim in?

Swim with caution, moderate algae may be present. Grapevine Reservoir Mid Lake has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 23.7 µg/L. Always check local health department advisories before swimming.

Tarrant County, Texas

Grapevine Reservoir Mid Lake

Grade CFair · 3.1 ft clarity

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Eutrophic

Grapevine Reservoir Mid Lake is a productive, nutrient-rich eutrophic lake in Tarrant County, Texas. Water quality is graded C based on 2 sampling years through 2025. Compared to the 2 other monitored lakes in Tarrant County, Grapevine Reservoir Mid Lake ranks #3 for water quality.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2025-12-16. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swim with caution, moderate algae may be present

Water Quality Grade: C, Fair

Very murky, less than 3.1 ft of visibility. Phosphorus level: 33.1 µg/L. Chlorophyll-a: 23.7 µg/L. Trophic State Index: 59.

Metric	Value	Grade
Water Clarity (Secchi Depth)	3.1 ft	D
Phosphorus	33.1 µg/L	C
Chlorophyll-a (Algae)	23.7 µg/L	D
Trophic State Index (TSI)	59	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Grapevine Reservoir Mid Lake

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