Ashtabula Viaduct, Spanning Ashtabula River at U.S. Route 20 (Prospect Road), Ashtabula, Ashtabula County, OH

Significance: This concrete, open spandrel rib arch viaduct is of engineering significance for its outstanding design feature of a complete separation of the superstructures at the end of each span using only abutting expansion joints. To accommodate the deck movement, long columns were used with a slenderness especially adapted. The viaduct was built by the Standish Engineering Company of Chicago, Illinois.
Unprocessed Field note material exists for this structure: N1520
Survey number: HAER OH-107
Building/structure dates: 1926-1928 Initial Construction
Building/structure dates: 1949 Subsequent Work
Building/structure dates: 1961 Subsequent Work
Building/structure dates: 1965 Subsequent Work
Building/structure dates: 1971 Subsequent Work