North Winchester Bridge Replacement

Historical Overview

• Construction: The bridge was constructed in 1923 by builder H. E. Doering of Portland, Oregon, and designed by engineer Conde Balcom McCullough of the Oregon State Highway Commission.
• Structure Type: It’s a concrete open spandrel deck arch bridge, known for its aesthetic Tudor and Gothic treatment of spandrel columns, curtain walls, and pedestrian lookouts.
• Significance: The Winchester Bridge is the longest reinforced-concrete ribbed deck arch designed by McCullough in the 1920s, exemplifying his view that a reinforced-concrete arch should be favored in bridge design for its “quiet, simple dignity of its lines.”
• Dimensions: The main span length is 112.0 feet (34.1 meters), with the total structure length being 901.6 feet (274.8 meters). The roadway width is 24 feet (7.32 meters).
• Initial Construction: The bridge was initially constructed in 1924.

2018 Reconstruction

• Project Overview: The reconstruction was part of the Old Highway 99N Reconstruction Project, which included the replacement of two bridges to accommodate a wider roadway section.
• Elements: The project comprised three major elements: bridge work, road work, and sewer utility work.
• Completion: The bridge work was substantially completed by December 2018, with the final lift paving scheduled for April, depending on weather conditions.