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Interstate Bridge
Trunnion Replacement
9-day Closure of the Interstate Bridge
Sept. 12-20, 2020
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Aug. 6, 2020
I-5 Interstate Bridge work starts in August
With the Sept. 12-20 closure of the northbound span 5 weeks away, advance prep work for the closure has begun
 Many of the components needed to replace mechanical parts in the south tower, including sheaves (shown at right in above photo), cables and trunnions, arrived at the Interstate Bridge Tuesday. This equipment helps raise and lower the lift span.
View more photos and a video of the barge carrying components to the Interstate Bridge from a dock near the St. Johns Bridge.
Arrival of bridge components kicks off the project
On Tuesday, Aug. 4, the specially fabricated bridge components arrived on a barge at the Interstate Bridge, the end of a long journey from an Alabama foundry. Crews are preparing for the 9-day closure of the northbound span of the bridge Sept. 12-20.
While the heaviest impacts will occur during the closure of the northbound span of the bridge and the following 7-day lane closure on I-5 south, the project began in August and continues through October.
August traffic impacts
Beginning mid-August, travelers should expect nighttime lane closures on I-5 and the Interstate Bridge, up to 30-minute bridge lifts on I-5 north, and nighttime ramp closures for traffic control on the following ramps:
- SR 14/Washington Street on-ramp to I-5 south in Vancouver.
- Marine Drive on-ramp to I-5 north in Portland.
- Hayden Island on-ramp to I-5 north in Portland.
- North Victory on-ramp to I-5 north in Portland.
9-Day closure traffic impacts
During the 9-day closure Sept. 12-20, travelers crossing the Interstate Bridge in both directions will share the three lanes and the sidewalk on the southbound span. Movable concrete barriers will allow two lanes of traffic to travel in the heaviest direction, with two southbound lanes open for the morning commute and two northbound lanes open for the afternoon commute. The sidewalk on the southbound span will remain open at all times to people walking or riding bicycles.
After the closure, Travelers will experience a single lane closure on I-5 south at the Interstate Bridge Sept. 21-27 as construction crews remove equipment from the area.
Visit Interstatebridge.org, the project web site, for more information and TripCheck.com for real-time traffic updates.
Travel strategies
Last week, ODOT sent updates to more than 20,000 homes adjacent to I-5 in Portland and Clark County to provide more information about traffic impacts during construction. The public should expect increasing bridge closure messages on social media, web advertising, radio spots and emails.
Travelers can help reduce congestion during the project by delaying or shifting trips to less congested times, taking transit or working from home or another location. Transit users can take advantage of expedited travel times with Bus on Shoulder programs on SR 14, I-5 and I-205. Learn more at c-tran.com/bus-on-shoulder.
When traveling, please follow all current public health guidelines and recommendations for safe travel practices.
About the Interstate Bridge
The Interstate Bridge is jointly owned by Oregon and Washington and is maintained and operated by ODOT. The northbound span opened in 1917 and the southbound span in 1958.
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