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SC 72 (CHURCH STREET) Bridge

Bridge Description

The skewed, 3 span, 118'-long continuous steel stringer bridge has concrete balustrades, concrete deck, 8 lines of 18"-deep rolled steel beam stringers with riveted splice plates, and 3-column reinforced concrete bents with arched caps. The span lengths are 35'-48"-35'.

Significance

The 1935 continuous steel stringer bridge, with 35'-48"-35' span lengths, is the oldest complete example of its type/design that would go one to become a state standard design. Earlier extant examples dating to 1931 do not have integrity because they have been widened. Because of its completeness and date of construction, this bridge is a historically and technologically significant example of a type and design that was important in the early development of the state’s highway system. It is eligible under Criterion C. The State Highway Department was in step with, even slightly ahead of, national trends in taking advantage of the economy of continuous designs and benefitted from advances in engineering theory and knowledge spread through national professional engineering organizations. Perhaps the most important advance was the development of standard methods for determining stresses in continuous bridges. Prior to 1930, the design of continuous bridges was tedious, intricate, and time consuming. Few state bridge engineers, including South Carolina’s Joseph Barnwell, used the continuous design for steel bridges in the 1920s because of the problems involved in analyzing the indeterminate structures. South Carolina’s Bridge Division adopted its first standard-design continuous steel stringer bridge in 1930. Standard Plan No. S-314 was for a continuous two-span bridge with each span measuring 25' long and an overall length of 50'. Continuous steel stringer bridges became very popular nationally after World War II. This bridge replaced a narrower wood overpass of the railroad cut. It was part of roadway improvements done using federal aid.