Marinship Development was contracted as the civil construction subcontractor to replace the rapidly aging Napoleon Street railroad bridge, which had undergone fire damage. The CalTrain rail line houses 32 train stations spanning 77 miles from San Francisco to Gilroy.  The Marin and Napoleon Street bridges were structurally deficient and did not meet updated seismic safety standards. Before our crews assisted in the replacement of the four short bridge spans with a center steel bridge and provided safety enhancements, the Napoleon Street Bridge showed signs of corrosion and deterioration.

As the Peninsula Corridor Joint Power Board sought to invest in sustainable infrastructure to support Caltrain, Marinship provided micro piles, cellular concrete fill, removal of existing concrete girder bridges and replacement of existing steel girders for the Napoleon Bridge project. Our team also constructed precast concrete approach slabs, in fill walls, and a backwall extension. The Marin Bridge rehabilitation portion of the scope of work included concrete retaining walls and slope repairs, cable railing, walkway replacement, and erosion control.

This project located near the base of Islais Creek, under the I-280 freeway, was central to improving transportation surrounding San Francisco’s Bayview neighborhood. While some of the project scope could be addressed during the day, this project required our crews to execute construction overnight and on weekends, to help maintain rail operations. Pedestrian and vehicular traffic were not impacted.

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