First Street Bridge, Spanning Napa River at First Street between Soscol Avenue & Juarez Street, Napa, Napa County, CA
Significance: The First Street Bridge over the Napa River is believed to be the first reinforced-concrete bridge in Napa County. John B. Leonard, one of California's leading bridge engineers in the early twentieth century, designed the structure. In 2004, the First Street Bridge was listed in the National Register of Historic Places.
Survey number: HAER CA-340
Building/structure dates: 1915 Initial Construction