ABSTRACT
ABSTRACT: The Dumbarton Rail Corridor is located in the southern region of the San Francisco Bay Area, connecting east and west bay. The Corridor is approximately 20.5 miles in length and includes a 4.5 mile segment that crosses the southern portion of the San Francisco Bay. The crossing of the Bay includes two bridges: the Dumbarton Bridge and Newark Slough Bridge, approximately 7550 and 422 feet long, respectively. Portions of these Bridges have timber and steel truss bridge sections that are approximately 100 years old, and each has a 100-year old swing span. The existing movable bridges have not been operational since the mid-1980’s and portions of the existing timber bridges were damaged in a fire in the late 1990’s. The Dumbarton Rail Corridor (DRC) Project proposes to provide commuter rail service by improving the existing rail infrastructure in the DRC Corridor. In order to reopen the Dumbarton and Newark Slough Bridges to accommodate the planned Dumbarton commuter rail service, several activities were performed in order to help determine if the bridges should be retrofitted or replaced. They include: Inspections (Underwater, Above Water), Concrete Coring of 100-year old large diameter caissons, Condition assessment of existing steel and concrete structures, Service Load Rating Analyses, Movable Bridge evaluation, Seismic Analyses, Constructability Review and Cost Estimates.
