Crater Lake
Crater Lake in Klamath County, Oregon is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 13211 acres.
- Area
- 13,211 acres
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Why Crater 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 Crater 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 Oregon DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Crater Lake is a 13,211-acre lake in Klamath County, Oregon.
Source: EPA Water Quality Portal sampling records, Oregon DEQ, 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 Crater 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 Crater Lake
Compare lakeside cabins, hotels, and vacation rentals near Crater Lake in Klamath County, Oregon — 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 Crater Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 13,211 acres |
No bathymetric survey has been published for Crater Lake, so its depth is not documented here.
Fishing Crater Lake
Nearby Lakes in Klamath County
Frequently asked questions about Crater Lake
Where is Crater Lake?
- Crater Lake is a lake in Klamath County, Oregon. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Crater Lake?
- Crater Lake in Klamath County, Oregon is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 13211 acres.
Is Crater Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Crater 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 Crater Lake across LakeQuality
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Where this data comes from
Measurements for Crater Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.