North 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 North Roosevelt Creek safe to swim today?

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North 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 North Roosevelt Creek last tested?

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The most recent water-quality sample at North Roosevelt Creek was collected on Apr 27, 2026 (36 days ago). California monitoring agencies test Bay Area beaches weekly during swim season (roughly May through October).

What is the bacteria level at North Roosevelt Creek?

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The latest reading at North Roosevelt Creek shows E. coli at 41 MPN/100mL (EPA single-sample limit: 235).

Does rain affect water quality at North 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 North Roosevelt Creek located?

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North Roosevelt Creek is located in the Peninsula area of the San Francisco Bay region (coordinates: 37.4890°N, 122.4562°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 North 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.