Gerig is a private dam located in Lassen County, California, near the city of Bieber. Built in 1939, this buttress-type dam stands at 10 feet high with a hydraulic height of 9 feet, serving primarily for water supply purposes such as irrigation and water storage. The dam, situated on the Pit River, has a maximum storage capacity of 110 acre-feet and a surface area of 10 acres.

Managed by the California Department of Water Resources (DWR), Gerig is regulated, permitted, inspected, and enforced by the state authorities to ensure its safety and compliance with regulations. Despite being categorized as low hazard potential, the dam's condition was assessed as satisfactory during the last inspection in September 2017. The dam is equipped with outlet gates, although details on spillway type and other associated structures are not provided in the data.

Gerig Dam, under the jurisdiction of the San Francisco District of the US Army Corps of Engineers, is a vital component of the local water infrastructure. With its historical significance and continued role in water management, Gerig serves as a noteworthy site for water resource and climate enthusiasts interested in the intersection of engineering, environmental stewardship, and sustainable water supply practices in California.