Bear Creek @ North Alpine Rd

Common questions.

Is Bear Creek @ North Alpine Rd safe to swim today?

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Bear Creek @ North Alpine Rd is currently inconclusive for swimming. Last sample is over 30 days old — too stale to be a reliable swim-safety indicator.

When was Bear Creek @ North Alpine Rd last tested?

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The most recent water-quality sample at Bear Creek @ North Alpine Rd was collected on Sep 24, 2025 (251 days ago). California monitoring agencies test Bay Area beaches weekly during swim season (roughly May through October).

What is the bacteria level at Bear Creek @ North Alpine Rd?

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The latest reading at Bear Creek @ North Alpine Rd shows E. coli at 30 MPN/100mL (EPA single-sample limit: 235).

Does rain affect water quality at Bear Creek @ North Alpine Rd?

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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 Bear Creek @ North Alpine Rd located?

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Bear Creek @ North Alpine Rd is located in the East Bay area of the San Francisco Bay region (coordinates: 38.0739°N, 121.2121°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 Bear Creek @ North Alpine Rd 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.