Half Moon Bay, California

Half Moon Bay Coastal Trail - Arroyo de En Medio Bridge (San Mateo County, California)
Concrete stone arch on coastal trail overlayed with pre-fab steel bridge - Originally located on CA-1 until the highway was rerouted.
Closed-spandrel arch bridge over Arroyo de En Medio on Half Moon Bay Coastal Trail
Open to pedestrians only

Pilarcitos Creek Bridge (San Mateo County, California)
Built 1900
Concrete arch bridge over Pilarcitos Creek on Main Street in Half Moon Bay
Open to traffic