West Corner of Big Valley Rancheria Marina Lake
West Corner of Big Valley Rancheria Marina Lake in Lake County, California has a water quality grade of C (Fair). Water clarity: 2.1 ft visibility. Chlorophyll-a (algae): 8.6 µg/L.
- Clarity
- 2.1 ft
- Type
- Eutrophic
West Corner of Big Valley Rancheria Marina Lake is a productive, nutrient-rich eutrophic lake in Lake County, California. Water quality is graded C based on 1 sampling years through 2026. Compared to the 35 other monitored lakes in Lake County, West Corner of Big Valley Rancheria Marina Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2026-04-30. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyModerate
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Generally safe for swimming, moderate water quality
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Water Quality Grade: C (Fair)
Very murky, less than 2.1 ft of visibility. Chlorophyll-a: 8.6 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 8.6 µg/L | Fair |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near West Corner of Big Valley Rancheria Marina Lake
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Fishing West Corner of Big Valley Rancheria Marina Lake
County Ranking
Ranked #6 of 36 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about West Corner of Big Valley Rancheria Marina Lake
Where is West Corner of Big Valley Rancheria Marina Lake?
- West Corner of Big Valley Rancheria Marina Lake is a lake in Lake County, California. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for West Corner of Big Valley Rancheria Marina Lake?
- West Corner of Big Valley Rancheria Marina Lake in Lake County, California has a water quality grade of C (Fair). Water clarity: 2.1 ft visibility. Chlorophyll-a (algae): 8.6 µg/L.
Is West Corner of Big Valley Rancheria Marina Lake safe to swim in?
- Generally safe for swimming, moderate water quality. West Corner of Big Valley Rancheria Marina Lake has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 8.6 µg/L. Always check local health department advisories before swimming.
Explore West Corner of Big Valley Rancheria Marina Lake across LakeGrade
More California Lake Rankings
Other Grade C Lakes in California
Eutrophic Lakes in California
Where this data comes from
95 measurements from 1 monitoring station, 2020–2026. 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_BVR95 samples · 2020–2026
Analytical methods
- Chlorophyll a
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.