Rodeo Lagoon W Top Lake
Marin County, CaliforniaView mapDirections
SWRCB publishes the water-quality measurements for Rodeo Lagoon W Top Lake. Here is what has been measured.
- Limited data
Rodeo Lagoon W Top Lake in Marin County, California has water-quality measurements published by SWRCB, shown here as reported. Chlorophyll-a (algae): 66.7 µg/L.
Rodeo Lagoon W Top Lake is a lake in Marin County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-08-03. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Rodeo Lagoon W Top Lake is safe to swim in today is a call for the California State Water Resources Control Board and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Rodeo Lagoon W Top Lake
These are the measurements SWRCB publishes for Rodeo Lagoon W Top Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Chlorophyll-a 66.7 µg/L. TSI 72.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 66.7µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 72 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
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Frequently asked questions about Rodeo Lagoon W Top Lake
Where is Rodeo Lagoon W Top Lake?
- Rodeo Lagoon W Top Lake is a lake in Marin County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Rodeo Lagoon W Top Lake?
- Rodeo Lagoon W Top Lake in Marin County, California has water-quality measurements published by SWRCB, shown here as reported. Chlorophyll-a (algae): 66.7 µg/L.
Is Rodeo Lagoon W Top Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Rodeo Lagoon W Top Lake across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- USGS California Water Science Center
USGS-CA1 sample · 2022
Analytical methods
- Plant pigments, sonication & 445
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.