https://www.mercurynews.com/2021/01/12/2-5-billion-pacheco-dam-project-moves-forward-despite-cost-increase/

Leaders of the largest water district in Silicon Valley decided Tuesday to move forward with a plan to build a $2.5 billion dam near Pacheco Pass in Southern Santa Clara County — in what would be the largest new reservoir in the Bay Area in 20 years — despite learning that the cost has doubled due to unstable geology on the site.

Although several board members of the Santa Clara Valley Water District expressed concerns during their meeting about the growing price tag, others said the proposed project’s water storage is needed for the future, and that the agency should continue ahead with studies and public meetings.