Interstate Bridge

Columbia River mile: 106.5

Opened: February 14, 1917 (northbound); July 1, 1958 (southbound)

Type: Vertical lift

Main Span Length: 279 feet

Center Height to Water: 38 feet (lift span closed); 174 feet (lift span open)

Outside Width: 38 feet (northbound); 39 feet (southbound)

Color: ODOT green

Cost: $1.75 million (1917 span); $14.5 million (1958 span and alterations to 1917 bridge)

Owner: States of Oregon and Washington, jointly

Engineer/Designer: Waddell & Harrington, Kansas City, Missouri (northbound); ODOT (southbound)

Access: pedestrians, bicycles allowed

Bridge Opening Signals audible: two long, one short; radio call (Channel 13) KBM

Average Daily Traffic: 130,000 (both bridges)


Last updated: 19 February 2010.