SR-186 All-American Canal Bridge Project

The SR-186 All-American Canal Bridge Project, managed by Caltrans District 11, involves the replacement of an existing bridge with a new 580-foot-long segmental concrete structure in southeastern Imperial County, California. The project spans approximately 1.5 miles along State Route 186 between post mile 0.5 and 2.0, realigning the highway to meet new bridge abutments and terminating at the intersection with Interstate 8. The new bridge will feature two 12-foot-wide lanes, eight-foot-wide shoulders, and six-foot-wide sidewalks for pedestrian and bicycle access, with tubular railing installed atop concrete barriers. Technical construction elements include the use of 60-inch diameter cast-in-drilled-hole reinforced concrete piles, road cut/fill, and specific segmental box girder designs to ensure the bridge spans the canal without any supports within the water. The scope of work extends beyond bridge construction to include drainage, landscaping, utility relocation, and the acquisition of easements from the Bureau of Reclamation. Environmental compliance is a critical component, as the project has received CEQA Class 2 categorical exemptions and NEPA categorical exclusions, confirming it meets state and federal regulatory standards. Contractors must adhere to strict environmental and safety protocols, including air pollution controls compliant with the Imperial County Air Pollution Control District, the use of Tier 4 engines for off-road diesel vehicles, and the implementation of lead compliance plans if required. Additionally, the contract mandates the inspection and cleaning of equipment to prevent invasive species and provides for pre-construction building inspections for nearby structures to document conditions prior to any vibration-inducing work.