New Bay Crossing May Pass Under Alameda

New Bay Crossing May Pass Under Alameda


Bay Area Rapid Transit (BART) staff is in the early stages of planning for a second tube across San Francisco Bay. One of the routes BART is considering would run under Alameda and bring with it at least one station. The new tube could also bring Amtrak’s Capitol Corridor train service running in tandem with BART across the Bay.

Before the transit agency drafts any plans, it must first determine the amount of ridership it would serve in the decades ahead. BART is looking at more than just the traditional nine-county region. It is also looking at projected transit needs of a 21-county mega-region stretching from Placerville to Monterey. And standard-gauge rail agencies, like Amtrak, have become partners in BART’s planning effort.

“It’s not so much Placerville to Monterey, but about what happens with all the demand that comes over the Altamont Pass,” said Ellen Smith, BART group manager, for the second transbay tube. 

“An early study led by the Metropolitan Transportation Commission (MTC) did look at a shared facility [with standard-gauge rail]. And so we are going to pick up where they left off and evaluate the demand and see if a stand-alone facility or two separate facilities would be appropriate.”

There are two reasons for adding a new crossing. First, BART has nearly reached its passenger capacity during commute hours, and second, the new crossing would allow for 24/7 service across San Francisco Bay even when a tube is shut down, particularly for maintenance. 

“The only way to increase capacity now is to replace the train-control system, which would allow us to run more trains closer together,” said Jim Allison, BART media relations manager. “But once we do that, we’re maxed out. So, the second crossing is not only to provide the ability to run 24 hours a day, but also to increase the capacity for a region that is going to keep growing.”

Upgrades are in the works to increase capacity that would involve more train cars, the new train-control system, new traction power and a yard expansion. “We’re seeking funding for that whole package, called ‘core capacity,’” said Smith. “That would increase our capacity by about 30 percent; beyond that, we would need another facility.”

An Alameda BART station has been on the minds of city officials for years. A 2007 Metropolitan Transportation Commission regional rail plan calling for a new transbay rail crossing included Alameda. The first transfer of Alameda Point land from the Navy in 2013 brought the transit issue to the forefront. Barely a month after the land transfer ceremony in June 2013, then-Mayor Marie Gilmore sent a letter to the BART General Manager highlighting the benefits of potentially two West End stations.

“This [2007 MTC] Plan outlined a range of options for new infill stations along a new transbay line, which included stops at the former Naval Air Station Alameda and at the intersection of Webster Street and Atlantic Avenue,” stated Gilmore. “Alameda Point and other major development areas at or near these proposed transit stops in the city are already designated as priority development areas for the region. 


Smith said there is currently no shortlist on where the new transbay crossing would enter the Bay. Part of the decision depends on where BART decides to land in San Francisco. Even though recent BART maps depict crossing options that traverse Alameda Point and West Oakland, Smith said, “It’s just a concept of how we would go from the upper A line between Coliseum and Lake Merritt to the west and San Francisco.” 

If the new line goes through Alameda, it would be underground. “Presumably we’d be using technology that would take us under the geographic area that Alameda Point encompasses,” said Smith. “It will more likely be a tunnel-boring machine, but we have not determined the technology yet. A trench is cut-and-cover, and a boring machine goes down and stays down all the way to the end unless there are stations.”

Regional Measure RR has provided BART with an initial planning budget for the second crossing of $10 million. BART staff will be meeting with jurisdictions and transit agencies throughout the 21-county region. “The demand study happens first,” said Smith. “There’s a lot of technical analysis that has to be done before there’s anything that people can grab onto.”

When BART meets with Alameda officials, the transit agency will be looking at potential ridership originating at an Alameda station. “We’re always looking for density when we do evaluation studies,” said Smith. “Has that jurisdiction adequately zoned to justify the investment? We’ll definitely be working with the City of Alameda as we go through this process.”


Richard Bangert posts stories and photos about environmental issues on his blog at Follow him on Twitter at