Vail Dam Seismic and Hydrologic Remediation Project [Project No. D1911]

The Vail Dam Seismic and Hydrologic Remediation Project, managed by the Rancho California Water District, involves the construction of a new straight axis gravity concrete dam located immediately downstream of the existing Vail Lake Dam in unincorporated southwestern Riverside County, east of Temecula, California. The primary objective of the replacement dam is to maintain a storage capacity and maximum reservoir level essentially equal to the levels existing prior to water level restrictions, which will result in a slight increase in lake surface area of approximately 0.66 acre between the two structures. The project is subject to strict environmental and regulatory compliance, including a Clean Water Act section 401 water quality certification issued by the San Diego Water Board. As a responsible agency, the San Diego Water Board approved the project on September 15, 2025, following the adoption of mitigation measures and a monitoring plan based on an environmental impact report prepared under CEQA. The project is classified under NAICS code 237990 and is currently listed as a forecast.