ARJOU RESERVOIR DAM AND SPILLWAY REPAIR PROJECT

The Araujo Reservoir Dam and Spillway Repair Project involves comprehensive upgrades to bring the dam into compliance with Division of Safety of Dams requirements. Key improvements include excavating and removing the downstream portion of the existing embankment, installing a seepage barrier through a cutoff trench, adding internal drainage systems to manage and redirect seepage, and reconstructing the dam with increased height to ensure adequate freeboard. Borrow material for the new embankment will be sourced from adjacent sites. The existing spillway will be demolished and replaced with a new concrete drop inlet spillway designed to handle the design stormflow, with its control section restored to the original elevation to preserve the reservoir’s intended storage capacity. The new spillway will connect via a conduit to the existing downstream pipe that directs flows to the primary stream channel. Additionally, the current outlet will be removed and substituted with a new outlet conduit that meets current DSOD safety standards, ensuring proper control and discharge of reservoir water. The project is being coordinated by Napa County, with the place of performance located in Calistoga, California, 94515. The solicitation was posted on June 30, 2025, and inquiries can be directed to Dana Morrison, Supervising Planner at the County of Napa, or David Lounsbury of WBECorp, the consulting civil engineers. No set-aside or NAICS code information is provided, and the project is currently in forecast status with no formal solicitation number yet assigned. The goal is to enhance structural integrity, manage water flow safely, and restore the reservoir’s original functionality under upgraded safety protocols.