What is the water quality grade for Somerville Lake Big Creek Arm?

Somerville Lake Big Creek Arm in Burleson County, Texas received a water quality grade of D (Poor). Water clarity: 1.8 ft visibility. Phosphorus: 85 µg/L. Chlorophyll-a (algae): 67.7 µg/L.

Is Somerville Lake Big Creek Arm safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Somerville Lake Big Creek Arm has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 67.7 µg/L. Always check local health department advisories before swimming.

Burleson County, Texas

Somerville Lake Big Creek Arm

Grade DPoor · 1.8 ft clarity

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Eutrophic

Somerville Lake Big Creek Arm is a productive, nutrient-rich eutrophic lake in Burleson County, Texas. Water quality is graded D based on 2 sampling years through 2025. Compared to the 1 other monitored lakes in Burleson County, Somerville Lake Big Creek Arm ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2025-11-18. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 1.8 ft of visibility. Phosphorus level: 85 µg/L. Chlorophyll-a: 67.7 µg/L. Trophic State Index: 70.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.8 ft	F
Phosphorus	85 µg/L	D
Chlorophyll-a (Algae)	67.7 µg/L	F
Trophic State Index (TSI)	70	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Somerville Lake Big Creek Arm

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