South Roosevelt Creek

Each dot is one sample taken by the monitoring agency. The dashed brick line marks the EPA single-sample limit.

Common questions.

Is South Roosevelt Creek safe to swim today?

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South Roosevelt Creek is currently inconclusive for swimming. Last sample is over 30 days old — too stale to be a reliable swim-safety indicator.

When was South Roosevelt Creek last tested?

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The most recent water-quality sample at South Roosevelt Creek was collected on Apr 20, 2026 (43 days ago). California monitoring agencies test Bay Area beaches weekly during swim season (roughly May through October).

What is the bacteria level at South Roosevelt Creek?

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The latest reading at South Roosevelt Creek shows E. coli at 52 MPN/100mL (EPA single-sample limit: 235).

Does rain affect water quality at South Roosevelt Creek?

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Yes. Heavy rainfall washes bacteria and pollutants from land into the water, raising contamination risk for 24–72 hours. The past 48 hours recorded 0.00 in of rain; the past 72 hours recorded 0.00 in. Our advisory threshold is ≥1.00 in over 48h (or ≥0.50 in over 72h) for enclosed or storm-drain beaches.

Where is South Roosevelt Creek located?

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South Roosevelt Creek is located in the Peninsula area of the San Francisco Bay region (coordinates: 37.4872°N, 122.4550°W). You can get turn-by-turn directions via Google Maps or Apple Maps directly from this page.

How is the water quality data for South Roosevelt Creek collected?

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Bacteria samples are collected by California state and county health agencies under the AB 411 Safe-to-Swim program and reported to the state's Safe-to-Swim database (data.ca.gov). Rainfall figures come from Open-Meteo forecast and archive data. Bay Area Swim aggregates both sources and updates every morning.