Building a better bridge in Petaluma

Matt Brown, THE PRESS DEMOCRAT

Standing atop a column that will soon support a new bridge over the Petaluma River, Jeffrey Kress reached up, touched the underside of the existing span and felt the vibrations of thousands of motorists zipping along Highway 101 unaware of the work taking place just a few feet below the road.

Constructing a major bridge in the exact footprint of an existing one without disrupting road, rail or river traffic is a highly complicated dance, one that Kress, a senior bridge engineer at Caltrans, and his colleagues have been choreographing for months.

They are overseeing efforts to swap out the 60-year-old twin two-lane spans over the river with a modern, six-lane, $130 million bridge.

via Building a better bridge in Petaluma | The Press Democrat.