8, at the ends, rest on solid rock. The intermediate piers rest on driven timber pilings. Piers 2, 4, 5, and 7 rest on 180 vertical piles, while piers 3 and 6, required to resist lateral thrust, have 260 piers driven at an angle. The detailing of the bridge incorporates Art Deco motifs, with prominent pylons at the ends with stepped Moderne elements and stylized Palladian windows crowned by sunbursts. The railings use a simplified, rectilinear Tuscan order with arches on short ribbed columns. The bridge has required extensive preventive maintenance to mitigate deterioration due to the location's salt air. A $20 million rehabilitation ran from 2001 to 2004. A previous project in 1976 mitigated scouring problems at pier 2. Construction of the bridge required the excavation of of earth and consumed of piling, of concrete, of reinforcing steel, and of structural steel. Designation The Isaac Lee Patterson Bridge was placed on the National Register of Historic Places on August 5, 2005. Further reading See also List of bridges documented by the Historic American Engineering Record in Oregon List of bridges on U.S. Route 101 in Oregon List of bridges on the National Register of Historic Places in Oregon References External links Road bridges on the National Register of Historic Places in Oregon Bridges completed in 1932 Open-spandrel deck arch bridges in the United States U.S. Route 101 Historic Civil Engineering Landmarks Concrete bridges in Oregon Art Deco architecture in Oregon National Register of Historic Places in Curry County, Oregon Transportation buildings and structures in Curry County, Oregon Historic American Engineering Record in Oregon Bridges by Conde McCullough Bridges of the United States Numbered Highway System Gold Beach, Oregon