Santiago Creek Dam Improvement Project

The Santiago Creek Dam Improvement Project involves comprehensive rehabilitation and expansion of water infrastructure at Irvine Lake in Orange County, California, managed by the Irvine Ranch Water District. The core objectives are to enhance water storage capacity and ensure long-term operational reliability by replacing outdated outlet and spillway facilities. A new inlet/outlet structure will be constructed, featuring an inclined intake, riser pipelines, bifurcation valve vaults, and an emergency outlet system with a dedicated valve vault. The existing spillway will be replaced with a modern side-channel design, raised six feet to an elevation of 797.9 feet, enabling year-round water retention and increasing storage capacity by approximately 1,600 acre-feet. Alongside this, the dam crest will be modified with removal of the existing face, installation of a filter drain system, widening, and elevation increase of up to one foot, supplemented with protective railings. Ancillary improvements include a new access roadway, spillway bridge, dam control building, and emergency walkway with stairs. The Irvine Lake pipeline will be upsized and relocated underground beneath the new spillway to support infrastructure integration and long-term resilience. The project is governed by California Environmental Quality Act (CEQA) compliance, with an Environmental Impact Report completed and a Negative Declaration filed, indicating no significant unmitigated environmental impacts requiring mitigation measures. Administrative filings are processed through the Orange County Clerk-Recorder’s Office with a State Clearinghouse number of 2023050097, and fees have been paid to the California Department of Fish and Wildlife. The project is designated under NAICS code 237990 for other heavy and civil engineering construction. While the contracting vehicle, solicitation number, and detailed evaluation criteria are not available in the provided documentation, the work is framed as a forecasted initiative with a defined scope and location at Santiago Creek Dam, northwest of Irvine Lake. Oversight and coordination are managed by the Irvine Ranch Water District, with Fiona Nye, Director of Water Resources, serving as the primary point of contact. The project does not appear to involve federal procurement mechanisms, as no FAR clauses, solicitation forms, pricing details, or contractor-specific certifications are present, and all referenced processes align with state and local regulatory and administrative protocols.