State Dwr-Upper Arm of Clear Lake
State Dwr-Upper Arm of Clear Lake in Lake County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.6 ft visibility.
- Clarity
- 5.6 ft
Why State Dwr-Upper Arm of Clear 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 State Dwr-Upper Arm of Clear Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, but not phosphorus 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.
State Dwr-Upper Arm of Clear Lake is a lake in Lake County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-06-16. 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 State Dwr-Upper Arm of Clear Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 5.6 ft. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.6 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near State Dwr-Upper Arm of Clear Lake
Compare lakeside cabins, hotels, and vacation rentals near State Dwr-Upper Arm of Clear Lake in Lake County, California — 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 State Dwr-Upper Arm of Clear Lake
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Fishing State Dwr-Upper Arm of Clear Lake
Graded lakes near State Dwr-Upper Arm of Clear Lake
State Dwr-Upper Arm of Clear Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Lake County
Frequently asked questions about State Dwr-Upper Arm of Clear Lake
Where is State Dwr-Upper Arm of Clear Lake?
- State Dwr-Upper Arm of Clear Lake is a lake in Lake County, California. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for State Dwr-Upper Arm of Clear Lake?
- State Dwr-Upper Arm of Clear Lake in Lake County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5.6 ft visibility.
Is State Dwr-Upper Arm of Clear Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. State Dwr-Upper Arm of Clear 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 State Dwr-Upper Arm of Clear Lake across LakeGrade
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Where this data comes from
12 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Big Valley Band of Pomo Indians of the Big Valley Rancheria, California (Tribal)
CA_BVR12 samples · 2020–2021
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.