What is the water quality grade for Nla Lake?

Nla Lake in Johnston County, Oklahoma received a water quality grade of C (Fair). Water clarity: 9.3 ft visibility. Phosphorus: 3510.3 µg/L. Chlorophyll-a (algae): 3.1 µg/L.

Is Nla Lake safe to swim in?

Generally safe for swimming, moderate water quality. Nla Lake has an overall water quality grade of C. Algae concentration (chlorophyll-a) is 3.1 µg/L. Always check local health department advisories before swimming.

Johnston County, Oklahoma

Nla Lake

Grade CFair · 9.3 ft clarity

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Eutrophic

Nla Lake is a productive, nutrient-rich eutrophic lake in Johnston County, Oklahoma. Water quality is graded C based on 2 sampling years through 2017. Compared to the 1 other monitored lakes in Johnston County, Nla Lake ranks #1 for water quality.

Source: EPA Water Quality Portal sampling records, Oklahoma DNR, last sampled 2017-08-29. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Moderate clarity, visible to about 9.3 ft. Phosphorus level: 3510.3 µg/L. Chlorophyll-a: 3.1 µg/L. Trophic State Index: 69.

Metric	Value	Grade
Water Clarity (Secchi Depth)	9.3 ft	B
Phosphorus	3510.3 µg/L	F
Chlorophyll-a (Algae)	3.1 µg/L	B
Trophic State Index (TSI)	69	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Nla Lake

Compare lakeside cabins, hotels, and vacation rentals near Nla Lake in Johnston County, Oklahoma — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

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