What is the water quality grade for Nla Lake?

Nla Lake in Thurston County, Washington received a water quality grade of D (Poor). Water clarity: 7.7 ft visibility. Phosphorus: 26517.8 µg/L. Chlorophyll-a (algae): 10.4 µg/L.

Is Nla Lake safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Nla Lake has an overall water quality grade of D. Algae concentration (chlorophyll-a) is 10.4 µg/L. Always check local health department advisories before swimming.

Thurston County, Washington · 46.83°N

Nla Lake

Grade DPoor · 7.7 ft clarity

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Hypereutrophic

Nla Lake is a highly nutrient-loaded hypereutrophic lake in Thurston County, Washington. Water quality is graded D based on 3 sampling years through 2017. Compared to the 18 other monitored lakes in Thurston County, Nla Lake ranks #17 for water quality.

Source: EPA Water Quality Portal sampling records, Washington DNR, last sampled 2017-07-20. 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

Moderate clarity, visible to about 7.7 ft. Phosphorus level: 26517.8 µg/L. Chlorophyll-a: 10.4 µg/L. Trophic State Index: 84.

Metric	Value	Grade
Water Clarity (Secchi Depth)	7.7 ft	C
Phosphorus	26517.8 µg/L	F
Chlorophyll-a (Algae)	10.4 µg/L	C
Trophic State Index (TSI)	84	Hypereutrophic

Very high nutrients, dense algae, poor clarity

Where to stay near Nla Lake

Compare lakeside cabins, hotels, and vacation rentals near Nla Lake in Thurston County, Washington — 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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