The northbound Winchester Bridge is an 18-span structure consisting of five 140.0-foot main span steel Warren deck truss spans. The 262.0-foot north approach is made up of four reinforced concrete girder spans. Three of the north approach spans measure 79-feet while the first span is a heavily skewed span averaging 20-feet. The 666.0-foot south approach consists of six 79.0-foot and three 64-foot reinforced concrete girder spans. The roadway is 28-feet wide and handles two 12-foot lanes of northbound traffic.
The bridge was designed by the Oregon State Highway Department under the guidance of State Bridge Engineer P. Mervyn Stephenson. The southbound bridge was built as part of the pre-interstate Pacific Highway Expressway (US 99), that later became a part of Interstate 5 when the highway was completed in 1966.
Length of largest span: 140.0 ft.
Total length: 1,637.0 ft.
Deck width: 28.0 ft.
Eligible for the National Register of Historic Places
Approximate latitude, longitude
+43.28222, -123.35556(decimal degrees) 43°16'56" N, 123°21'20" W (degrees°minutes'seconds")
Approximate UTM coordinates
USGS topographic map
OR 07663C (Oregon Dept. of Transportation structure number)
BH 29956 (Bridgehunter.com ID)
Inspection (as of 07/2011)
Deck condition rating: Fair(5 out of 9) Superstructure condition rating: Fair(5 out of 9) Substructure condition rating: Satisfactory(6 out of 9) Appraisal: Structurally deficient
Sufficiency rating: 8.0 (out of 100)
Average daily traffic (as of 2010)
February 22, 2011: New photos from Michael Goff
July 22, 2010: New photos from Michael Goff
April 20, 2010: New Street View added by Michael Goff