What is the water quality grade for Heron Lake Deep Dam?

Heron Lake Deep Dam in Rio Arriba County, New Mexico received a water quality grade of B (Good). Water clarity: 3.7 ft visibility. Phosphorus: 29 µg/L. Chlorophyll-a (algae): 1.6 µg/L.

Is Heron Lake Deep Dam safe to swim in?

Good for swimming, clear water with low algae levels. Heron Lake Deep Dam has an overall water quality grade of B. Algae concentration (chlorophyll-a) is 1.6 µg/L. Always check local health department advisories before swimming.

Rio Arriba County, New Mexico

Heron Lake Deep Dam

Grade BGood · 3.7 ft clarity

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Mesotrophic

Heron Lake Deep Dam is a mesotrophic lake in Rio Arriba County, New Mexico. Water quality is graded B based on 2 sampling years through 2024. Compared to the 15 other monitored lakes in Rio Arriba County, Heron Lake Deep Dam ranks #4 for water quality.

Source: EPA Water Quality Portal sampling records, New Mexico DNR, last sampled 2024-09-17. 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 3.7 ft. Phosphorus level: 29 µg/L. Chlorophyll-a: 1.6 µg/L. Trophic State Index: 49.

Metric	Value	Grade
Water Clarity (Secchi Depth)	3.7 ft	D
Phosphorus	29 µg/L	C
Chlorophyll-a (Algae)	1.6 µg/L	A
Trophic State Index (TSI)	49	Mesotrophic

Moderate nutrients, good water quality

Where to stay near Heron Lake Deep Dam

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