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 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.


• Sign up for Almanac Express to get news updates. Follow us on Facebook, Twitter and Instagram. Or show your support for local journalism by subscribing.

What is democracy worth to you?
Support local journalism.


There are no comments yet. Please share yours below.

Post a comment

Posting an item on Town Square is simple and requires no registration. Just complete this form and hit "submit" and your topic will appear online. Please be respectful and truthful in your postings so Town Square will continue to be a thoughtful gathering place for sharing community information and opinion. All postings are subject to our TERMS OF USE, and may be deleted if deemed inappropriate by our staff.

We prefer that you use your real name, but you may use any "member" name you wish.

Name: *

Select your neighborhood or school community: * Not sure?

Choose a category: *

Since this is the first comment on this story a new topic will also be started in Town Square! Please choose a category that best describes this story.

Comment: *

Verification code: *
Enter the verification code exactly as shown, using capital and lowercase letters, in the multi-colored box.

*Required Fields

Stay informed

Get daily headlines sent straight to your inbox.

What gives you hope?
By Sherry Listgarten | 22 comments | 3,583 views

Shake Shack to open doors at San Mateo's Hillsdale Shopping Center this weekend
By Elena Kadvany | 1 comment | 1,512 views

‘Twas the Night Before Christmas
By Cheryl Bac | 0 comments | 603 views

Premarital and Couples: What feeling is not allowed, and what do you use in its place?
By Chandrama Anderson | 0 comments | 533 views


Support local families in need

Your contribution to the Holiday Fund will go directly to nonprofits supporting local families and children in need. Last year, Almanac readers and foundations contributed over $150,000.