Parsons, Brinkerhoff, Hall & Macdonald
of New York City, New York
Arroyo Colorado Bridge (Cameron County, Texas)
Built 1953Vertical lift bridge over Arroyo Colorado on FM 106 in Rio HondoOpen to traffic
Walnut Street Bridge (New Castle County, Delaware)
Built 1954-1957Bascule bridge over Christina River on Walnut St. in WilmingtonOpen to traffic