Mount Veeder Road MPM 4.3 and 3.25 Slide Repair Project RDS26-24

The County of Napa is seeking to repair and stabilize Mount Veeder Road at mile post markers 3.25 and 4.3 following roadway failures caused by storms in 2025 and 2026. The project, identified as RDS26-24, aims to restore travel lane width and legal load capacity to ensure public safety and compliance with current Road and Street Standards. The scope of work includes the installation of a 14-foot-high, 184-foot-long concrete retaining wall supported by drilled piers and tiebacks. To maintain one open travel lane during construction, a shotcrete facing will be used as part of the shoring system. Final restoration will involve adding backfill and repaving the asphalt surface to restore pre-slide drainage patterns. The project is located in the public right of way near Yountville, California, and is subject to strict environmental and cultural protections. Because Mount Veeder Road is considered eligible for the National Register of Historic Places and the California Register of Historical Resources, specific safeguards are required. Environmental mandates include mandatory worker awareness training, the presence of an on-site biological monitor during all construction, and pre-construction surveys for special-status species. Additionally, the contractor must implement erosion control using natural fibers instead of plastic mono-filament netting, provide escape ramps for deep excavations, and adhere to strict petroleum spill reporting protocols. The project is currently categorized as a forecast with a NAICS code of 237310.