Mt. Veeder Road MPM 4.3 and MPM 3.25

Damage was caused to Mt. Veeder Road MPM 4.3 from the storm events occurring in Napa County in November 2025. Intense rainfall saturated the road embankment causing a downhill slide approximately 160 feet long on Mt. Veeder Road MPM 4.3 near Lokoya Road. The slide repair will include constructing a cast-in-drilled-hole (CIDH) concrete retaining wall extending approximately 187 feet. The wall heights are 4 feet to 16 feet. Tiebacks will be installed to provide additional lateral support and allow for one travel lane to remain open during construction. Repaving the roadway will restore the asphalt concrete surface and pre-slide drainage patterns. At Mt. Veeder Road 3.25, an approximately 100-foot long area of the downslope (northbound) lane is experiencing significant slope creep and settlements. This is typically followed by a land slide in future storm events that will threaten the road. To be pro-active, and instead of building an expensive retaining wall, stitch piers are proposed to help prevent the roadway from sliding. The stitch piers are 18” in diameter and extend 100 linear.

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