What is the water quality grade for Shallow Prong Lake?

Shallow Prong Lake in Jefferson County, Texas received a water quality grade of D (Poor). Water clarity: 1.3 ft visibility. Phosphorus: 80 µg/L. Chlorophyll-a (algae): 43.1 µg/L.

Is Shallow Prong Lake safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Shallow Prong Lake has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 43.1 µg/L. Always check local health department advisories before swimming.

Jefferson County, Texas

Shallow Prong Lake

Grade DPoor · 1.3 ft clarity

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Eutrophic

Shallow Prong Lake is a productive, nutrient-rich eutrophic lake in Jefferson County, Texas. Water quality is graded D based on 2 sampling years through 2025.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2025-05-12. 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 1.3 ft of visibility. Phosphorus level: 80 µg/L. Chlorophyll-a: 43.1 µg/L. Trophic State Index: 69.

Metric	Value	Grade
Water Clarity (Secchi Depth)	1.3 ft	F
Phosphorus	80 µg/L	D
Chlorophyll-a (Algae)	43.1 µg/L	F
Trophic State Index (TSI)	69	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Shallow Prong Lake

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