News

Earthquake safety retrofit planned for I-280 bridges at Sand Hill, Alpine

Deadline to comment on plans is Dec. 10

A rendering of what a bike and pedestrian diversion along Alpine Road might look like during Caltrans' proposed project to do seismic retrofit work on the I-280 highway bridges. (Image courtesy of Caltrans)

The California Department of Transportation, or Caltrans, is planning to improve seismic safety at four key local highway bridges.

The transportation agency plans to install steel column casings on both sides of the I-280 bridges at both Sand Hill Road and Alpine Road to make them safer in an earthquake.

Access the environmental impact analysis here.

These bridges, as well as one at the I-280/I-380 separation, were chosen by Caltrans' Office of Structure Maintenance and Investigation in 2015 because the structures were identified to have weaknesses that could lead to collapse during an earthquake.

As part of its construction plans near Alpine Road, the agency plans to create a detour for the bicycle and pedestrian path, the Alpine Trail, that runs alongside the road.

The trail also runs alongside Los Trancos Creek, which Caltrans plans to temporarily divert. To minimize impacts to the creek, as well as potential steelhead in the water, construction will occur only during low creek flows between June 15 and Oct. 15.

In addition, Caltrans proposes to remove weirs in the creek that act as barriers to fish passage, as well as plant native vegetation after construction to restore plant life to the area.

People are encouraged to submit their feedback about the proposed project by email to John.Seal@dot.ca.gov or by mail to the California Department of Transportation, District 4, Attn: John Seal, P.O. Box 23660, MS 8-B, Oakland, CA 94623-0660.

The deadline to comment is Tuesday, Dec. 10.

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