Argyle No. 2, also known as Sobrante Reservoir, is a public utility water supply dam located in El Sobrante, California. Constructed in 1970, this offstream dam stands at a height of 27 feet and has a storage capacity of 22 acre-feet. Managed by the California Department of Water Resources (DWR), this dam is crucial for providing water to the surrounding communities in Contra Costa County.

With a high hazard potential, Argyle No. 2 is regularly inspected and maintained to ensure its safety and structural integrity. The dam has been assessed as satisfactory, with the most recent inspection conducted in March 2021. The Emergency Action Plan (EAP) for this dam was last revised in January 2018, highlighting the importance of preparedness and risk management measures in case of emergencies. As a vital water resource structure in the region, Argyle No. 2 plays a key role in water supply and management efforts, especially in the context of changing climate conditions and increasing water demand.