This project improved fish passage through the nearly 400-foot Caltrans I-80 double-bay box culvert on Pinole Creek in the City of Pinole, Contra Costa County. Construction added concrete notch baffles, training walls, a terminal rock pool, and a rocked downstream chute, opening nearly 7 miles of documented spawning and rearing habitat. The project benefits a federally threatened steelhead population recognized as one of very few viable runs within the San Francisco Bay Area.