Piedmont, also known as Reservoir No 2, is a public utility water supply reservoir located in Oakland, California. Built in 1905, this offstream dam stands at a height of 64 feet and has a maximum storage capacity of 60 acre-feet. The dam serves as a crucial water source for the region, with a primary purpose of water supply.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Piedmont is regulated, permitted, inspected, and enforced upon by the state. With a low hazard potential and a satisfactory condition assessment as of September 2017, the dam is deemed to be in good standing. The last inspection took place on October 16, 2019, with a frequency of every 1 year.

Situated in Alameda County, Piedmont plays a vital role in the water resource management of the area. With its historical significance and ongoing operational efficiency, the reservoir serves as a testament to responsible water infrastructure development and maintenance in the face of climate challenges and evolving regulatory standards.