Rodeo Lagoon E Top Lake
Rodeo Lagoon E Top Lake in Marin County, California has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 58.3 µg/L.
- Type
- Hypereutrophic
Grade F measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Rodeo Lagoon E Top Lake →
Rodeo Lagoon E Top Lake is a highly nutrient-loaded hypereutrophic lake in Marin County, California. Water quality is graded F based on 1 sampling years through 2022. Compared to the 2 other monitored lakes in Marin County, Rodeo Lagoon E Top Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-08-03. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
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.
Algae and nutrients are often high — check current advisories before swimming. Skip the water if you see scum or a paint-like bloom
Water Quality Grade: F (Algae-prone)
No clarity data. Chlorophyll-a: 58.3 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 58.3 µg/L | Poor |
| Trophic State Index (TSI) | 70 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Rodeo Lagoon E Top Lake
Compare lakeside cabins, hotels, and vacation rentals near Rodeo Lagoon E Top Lake in Marin 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Rodeo Lagoon E Top Lake are listed below.
Top-rated places to stay near Rodeo Lagoon E Top Lake
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Fishing Rodeo Lagoon E Top Lake
County Ranking
Ranked #3 of 3 lakes in Marin County
Nearby Lakes in Marin County
Frequently asked questions about Rodeo Lagoon E Top Lake
Where is Rodeo Lagoon E Top Lake?
- Rodeo Lagoon E Top Lake is a lake in Marin County, California. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Rodeo Lagoon E Top Lake?
- Rodeo Lagoon E Top Lake in Marin County, California has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 58.3 µg/L.
Is Rodeo Lagoon E Top Lake safe to swim in?
- Algae and nutrients are often high — check current advisories before swimming. Skip the water if you see scum or a paint-like bloom. Rodeo Lagoon E Top Lake has a water quality grade of F (Algae-prone). Algae concentration (chlorophyll-a) is 58.3 µg/L. Always check local health department advisories before swimming.
Explore Rodeo Lagoon E Top Lake across LakeGrade
More California Lake Rankings
Other Grade F Lakes in California
Hypereutrophic Lakes in California
Where this data comes from
6 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- USGS California Water Science Center
USGS-CA6 samples · 2020–2022
Analytical methods
- Plant pigments, sonication & 445
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.