Mallard Reservoir, located in Concord, California, was completed in 1930 and serves as a critical water supply source for irrigation and domestic use in the region. With a storage capacity of 3113 acre-feet and a surface area of 213 acres, Mallard Reservoir plays a vital role in supporting the water needs of the community. The dam, primarily used for water supply purposes, is classified as an earth dam with a height of 30 feet and a hydraulic height of 27 feet.

Managed by a public utility, Mallard Reservoir is subject to state regulation, inspection, and enforcement to ensure its safety and functionality. The dam has been assessed as being in satisfactory condition, with a significant hazard potential that necessitates regular inspections and maintenance. Despite its age, Mallard Reservoir continues to provide reliable water storage and distribution services to the residents of Contra Costa County, highlighting the importance of preserving and managing water resources in a changing climate landscape.