Cut Stone Bridge, Southern Pacific Railroad line spanning runoff channel at South Spruce Avenue, South San Francisco, San Mateo County, CA

Significance: The Cut Stone Bridge is significant in engineering history. It is eligible for the National Register under Criteria A and C, due to its age, associations, rarity and distinctiveness. It is an important example of California building practices in the 1860s. The bridge is associated with the construction and operation of the San Francisco-San Jose railroad, a key event in the history of this section of northern California. The structure's construction, the materials used, its plan, architectural style, proportion and form are typical of the period. The basis of its historic significance is that it is one of few bridge structures that remain dating from the period. The bridge is considered to be of local significance.
Survey number: HAER CA-263
Building/structure dates: 1863 Initial Construction