Nla Lake is a highly nutrient-loaded hypereutrophic lake in Okanogan County, Washington. Water quality is graded C based on 3 sampling years through 2017. Compared to the 6 other monitored lakes in Okanogan County, Nla Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Washington DNR, last sampled 2017-08-22. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Good clarity, visible to about 14 ft. Phosphorus level: 12516.3 µg/L. Chlorophyll-a: 4 µg/L. Trophic State Index: 74.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14 ft | B |
| Phosphorus | 12516.3 µg/L | F |
| Chlorophyll-a (Algae) | 4 µg/L | A |
| Trophic State Index (TSI) | 74 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Nla Lake
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Fishing Nla Lake
Location
County Ranking
Ranked #6 of 7 lakes in Okanogan County
Cleaner Lakes Within 30 Miles
Nla Lake holds Grade C. 5 nearby lakes hold higher grades.
- AFdr LakeOkanogan County · 7 mi · Two grade letters higher (C → A)
- ABanks LakeGrant County · 9.2 mi · Two grade letters higher (C → A)
- AFdr LakeLincoln County · 26.7 mi · Two grade letters higher (C → A)
- ANla LakeGrant County · 8.1 mi · Two grade letters higher (C → A)
- AFdr LakeFerry County · 12 mi · Two grade letters higher (C → A)
Nearby Lakes in Okanogan County
Explore Nla Lake across LakeGrade
More Washington Lake Rankings
Other Grade C Lakes in Washington
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2017-08-22
Monitoring stations: 1