Nla Lake is a productive, nutrient-rich eutrophic lake in King County, Washington. Water quality is graded C based on 3 sampling years through 2017. Compared to the 5 other monitored lakes in King County, Nla Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Washington DNR, last sampled 2017-06-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 1.6 ft of visibility. Phosphorus level: 29.7 µg/L. Chlorophyll-a: 11.5 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | F |
| Phosphorus | 29.7 µg/L | B |
| Chlorophyll-a (Algae) | 11.5 µg/L | C |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Nla Lake
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Fishing Nla Lake
Location
County Ranking
Ranked #6 of 6 lakes in King County
Cleaner Lakes Within 30 Miles
Nla Lake holds Grade C. 2 nearby lakes hold higher grades.
- CNla LakeKing County · 10.4 mi · Higher overall water quality score
- CNla LakeKing County · 12.6 mi · Higher overall water quality score
Nearby Lakes in King County
Explore Nla Lake across LakeGrade
More Washington Lake Rankings
Other Grade C Lakes in Washington
Eutrophic 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: 2017-06-28
Monitoring stations: 1