Castle Rocks Lake
Castle Rocks Lake in Denali County, Alaska is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 137 acres.
- Area
- 137 acres
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Why Castle Rocks Lake has no grade
We grade a lake only when the monitoring record supports a letter: 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 Castle Rocks Lake, no water-quality sampling on record for this lake.
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.
Castle Rocks Lake is a 137-acre lake in Denali County, Alaska.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Castle Rocks Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Castle Rocks Lake
Compare lakeside cabins, hotels, and vacation rentals near Castle Rocks Lake in Denali 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.
Top-rated places to stay near Castle Rocks Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 137 acres |
No bathymetric survey has been published for Castle Rocks Lake, so its depth is not documented here.
Fishing Castle Rocks Lake
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Frequently asked questions about Castle Rocks Lake
Where is Castle Rocks Lake?
- Castle Rocks Lake is a lake in Denali County, Alaska. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Castle Rocks Lake?
- Castle Rocks Lake in Denali County, Alaska is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 137 acres.
Is Castle Rocks Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Castle Rocks Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Castle Rocks Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.