Rodeo Lagoon W Bottom Lake
Rodeo Lagoon W Bottom Lake in Marin County, California has a water quality grade of D (Nutrient-rich). Chlorophyll-a (algae): 29.2 µg/L.
- Type
- Eutrophic
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Rodeo Lagoon W Bottom Lake →
Rodeo Lagoon W Bottom Lake is a productive, nutrient-rich eutrophic lake in Marin County, California. Water quality is graded D based on 1 sampling years through 2022. Compared to the 2 other monitored lakes in Marin County, Rodeo Lagoon W Bottom Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-11-08. 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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
No clarity data. Chlorophyll-a: 29.2 µg/L. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 29.2 µg/L | Poor |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Rodeo Lagoon W Bottom Lake
Compare lakeside cabins, hotels, and vacation rentals near Rodeo Lagoon W Bottom 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 W Bottom Lake are listed below.
Top-rated places to stay near Rodeo Lagoon W Bottom Lake
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Fishing Rodeo Lagoon W Bottom Lake
County Ranking
Ranked #1 of 3 lakes in Marin County
Nearby Lakes in Marin County
Frequently asked questions about Rodeo Lagoon W Bottom Lake
Where is Rodeo Lagoon W Bottom Lake?
- Rodeo Lagoon W Bottom Lake is a lake in Marin County, California. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Rodeo Lagoon W Bottom Lake?
- Rodeo Lagoon W Bottom Lake in Marin County, California has a water quality grade of D (Nutrient-rich). Chlorophyll-a (algae): 29.2 µg/L.
Is Rodeo Lagoon W Bottom Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Rodeo Lagoon W Bottom Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 29.2 µg/L. Always check local health department advisories before swimming.
Explore Rodeo Lagoon W Bottom Lake across LakeGrade
More California Lake Rankings
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Eutrophic Lakes in California
Where this data comes from
14 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-CA14 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.