Grayling Lake
Grayling Lake in Yukon-Koyukuk Census Area County, Alaska is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 200 µg/L.
Why Grayling Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Grayling Lake, no EPA ecoregion for this lake, so the National Lakes Assessment condition thresholds cannot be applied. Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Grayling Lake is a lake in Yukon-Koyukuk Census Area County, Alaska.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-06-05. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Grayling Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 200 µg/L. Trophic State Index: 81.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 200 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 81 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Grayling Lake
Compare lakeside cabins, hotels, and vacation rentals near Grayling Lake in Yukon-Koyukuk Census Area County, Alaska — 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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Fishing Grayling Lake
Nearby Lakes in Yukon-Koyukuk Census Area County
Frequently asked questions about Grayling Lake
Where is Grayling Lake?
- Grayling Lake is a lake in Yukon-Koyukuk Census Area County, Alaska. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Grayling Lake?
- Grayling Lake in Yukon-Koyukuk Census Area County, Alaska is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 200 µg/L.
Is Grayling Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Grayling Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Grayling Lake across LakeGrade
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Where this data comes from
2 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Alaska Dept of Environmental Conservation - Water Quality
AKDECWQ2 samples · 2023
Analytical methods
- 200.8 W ~ Metals in Waters by ICP/MS
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.