Calaveras Dam Replacement Project

Calaveras Dam is part of the Hetch Hetchy Regional Water System, owned and operated by the San Francisco Public Utilities Commission (SFPUC). Calaveras Dam retains the largest drinking water reservoir in the local San Francisco Bay Area and, when operating at normal capacity, provides more than half of the system's local storage capacity for 2.7 million customers. The 90-year-old earthen dam is located adjacent to an active earthquake fault. In 2001, the SFPUC lwered the water levels to 40% of its normal operating capacity due to seismic concerns and in 2011 began construction of a new earthen and rock fill dam to replace the existing adjacent dam.