Classic East Bay Rides Washed Out by Winter Rains

[Updated September 22, 2017. Check the county public works pages listed below for the latest closure information]

The record-setting rainy season this year has led to washed out roads and bridges around the East Bay, many along popular bike routes. Repairs are in progress but access may will remain restricted for some time. Read on for details, and let us know if you encounter a closure not listed here.

  • Morgan Territory Road​ is closed for construction, with completion anticipated in mid-October 2017. The street about 2 miles south of Marsh Creek Road will be completely closed once this repair begins. A detour is being created for use by local residents using an existing private road and a fire road, it is NOT recommended for bicyclists (info here).
  • Alhambra Valley Road between Castro Ranch and Bear Creek Roads is closed toall traffic (storm damage shown above). This is along the ‘Three Bears’ bike route north of Orinda, making this loop inaccessible for the time being. Emergency repair work has begun and is expected to be completed by the end of October 2017. In addition, this project will extend the existing bike lanes on Castro Ranch Rd through the curve onto Alhambra Valley Rd, and tighten the turning radius to help slow car traffic.

    For now, people biking north on Castro Ranch Road can still continue west on Pinole Valley Road, and the Bear Creek Road connections from Happy Valley Road to Lafayette and Alhambra Valley Road to Pleasant Hill remain open (more info).
  • Canyon Road in Moraga from Pinehurst Road to Constance Place is closed to all through traffic due to structural damage on the Canyon Road bridge, which will need to be replaced (info here). This closure will likely last until a one-lane temporary replacement bridge is installed in October.

    Normally the Lafayette-Moraga Trail would bypass this area, but part of the trail is also closed due to a mudslide. However, a narrow dirt path connecting from the trail to Augusta Dr does bypass the bridge closure (shown via map below). This is an unofficial bypass so if you use it please proceed with caution, yield to hikers, and bike respectfully through the surrounding neighborhoods to avoid having access restricted for everyone.

  • Calaveras Road from Sunol and Milpitas is closed to all traffic due to storm damage, between Geary Road and Oakridge Road (info here).
  • Palomares​ Road is OPEN again as of September 22! (info here)
  • Redwood​ Road is closed due to a roadway failure, south of Marciel Road in Castro Valley (info here). Redwood Road from the Oakland side remains open out to the Anthony Chabot campground. Emergency repair work is underway now, with completion expected by January 2018.
  • Arroyo del Valle Trail in Pleasanton is washed out between Harvest Circle and Main Street, and the Centennial Trail is closed between Val Vista Park and the Pleasanton Canal Trail (map of these and other Pleasanton trail closures here).
  • Comprehensive info about more trail closures at East Bay Regional Parks is available here.

Important phone numbers and webpages

Contra Costa County

  • Updates on current road conditions:
  • Public Works Maintenance Division‐ For emergencies during normal business hours, or to report a clogged drainage inlet: (925) 313‐7000
  • California Highway Patrol‐ For emergencies after hours: (707) 551‐4100
  • Contra Costa County Sheriffs Dispatch‐ For emergencies after hours: (925) 646‐2441

Alameda County

  • Updates on current road conditions:
  • Public Works Agency ‐ To report hazards during normal business hours: (510) 670-5500
  • California Highway Patrol‐ For emergencies after hours: (707) 551‐4100

Resources for reporting landslides, potholes, and other hazards in every East Bay city and unincorporated area are available online at