Monte Diablo crossing path spurs 101 closures

More road closures are on tap for U.S. Highway 101 as crews continue the first phase of construction needed by Caltrans before the agency can begin widening the freeway for an auxiliary lane.

The busy freeway will not have a new lane in each direction between Third and Millbrae avenues until spring 2011. Before then, three overcrossings need to be expanded and other work needs to be done in order for a new lane to fit.

Crews are using a 300-ton crane to erect two 187,000-pound concrete “bathtub” girders in each direction to construct a new Monte Diablo pedestrian crossing in San Mateo, which can accommodate an auxiliary lane beneath it.

The new pedestrian overcrossing should be completed by the end of October, said Caltrans spokeswoman Lauren Wonder. The project was originally supposed to be finished by Aug. 15. This is the first step in the auxiliary lane project and is slated to cost $2.2 million to $2.5 million, she said.

The new overpass will be taller, wider and feature new fencing. The extra-lane project is slated to cost more than $156 million.

Highway 101 southbound between Third and Peninsula avenues will be closed between 1 a.m. to 5 a.m. on Thursday and Friday.

Crews already closed this area and were expected to complete work on the northbound side by early Thursday morning.

mrosenberg@examiner.com

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