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Santiago Creek Dam Improvement Project

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State & Local

Contract Overview

Solicitation details, issuing organization, response deadlines, documents, and interested companies for this government contract opportunity.

AI Contract Overview

The Santiago Creek Dam Improvement Project, managed by the Irvine Ranch Water District, involves a comprehensive rehabilitation and replacement of the dam's outlet tower and spillway facilities to enhance long-term water resource benefits. Located at the northwest end of Irvine Lake in unincorporated Orange County, California, the project scope includes the construction of new inlet and outlet works, such as an inclined structure, intake riser pipelines, a bifurcation valve vault, and emergency outlet systems. The existing spillway will be replaced with a new side-channel spillway and raised by six feet to an elevation of approximately 797.9 feet. This elevation increase is designed to allow for year-round water impoundment, providing an additional storage capacity of approximately 1,600 acre-feet. Additional infrastructure improvements include the modification of the dam embankment through the installation of a filter drain system, widening and raising the dam crest by up to one foot, and the relocation and upsizing of a portion of the Irvine Lake pipeline to a below-ground position beneath the new spillway. Ancillary site developments will feature a new dam control building, a spillway bridge, an inlet/outlet access roadway, and emergency access walkways and stairs. The project received formal approval on November 10, 2025, following the preparation of an Environmental Impact Report, with the Notice of Determination filed with the Orange County Clerk-Recorder on November 12, 2025.

General Info

Irvine Ranch Water District project rehabilitating Santiago Creek Dam to increase water storage.

Agency

California → Irvine Ranch Water District

NAICS

237990 - Other Heavy and Civil Engineering ConstructionView NAICS

Place of Performance

Irvine, CA

Set-Aside

NONE

Documents

(2)

Santiago Creek Dam Improvement Project Notice of Determination

PDF•notice-of-determination

Santiago Creek Dam Environmental Impact Report Receipt

PDF•receipt

AI Contract Breakdown

Uniform Contract Format

Timeline

PostedNov 13

forecast

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Organization & Contact Information

AgencyCalifornia → Irvine Ranch Water District

Contacts1 person available

OfficeN/A

Organization / Agency

California → Irvine Ranch Water District

Office AddressN/A

Contacts

Fiona NyeDirector of Water Resources

contact@example.gov

+1 (555) 000-0000

Full Description

The Project proposes to rehabilitate and replace the Santiago Creek Dam outlet tower and spillway facilities and to modify the embankment to permit operation of the facilities for a long-term water resource benefit. The Project includes construction of a new inlet/outlet works, including an inclined inlet/outlet structure, intake riser pipelines and platforms, bifurcation valve vault, emergency outlet pipeline, and emergency outlet valve vault. The existing spillway would be replaced with a new side-channel spillway, and a portion of the Irvine Lake pipeline would be upsized and relocated to below ground beneath the proposed spillway structure. The Project includes improvements to the dam crest, removing the dam face, installing a filter drain system within new embankment shell material, widening the dam crest, raising the elevation of the dam crest by up to one foot, and installing protective railings. Ancillary site improvements are also proposed for the Project, including a new inlet/outlet access roadway, spillway bridge, dam control building, and emergency access walkway and stairs. The Project also includes raising the spillway by six feet to approximately 797.9 feet, which is two feet higher than the existing maximum water storage elevation with the flashboards installed. Raising the spillway would allow the dam to impound water up to the 797.9-foot elevation contour year-round, which would allow for storage of an additional approximately 1,600 acre-feet of water.