State: OR
County:
Owner: State
Location: Urban
Spans: Three-span
Beam material: Steel
Max Span Length (ft.): 1255
Total Bridge Length (ft.): 2152
Construction Equipment Category: Other ABC Method
ABC Construction Equipment: Strand jacks; Float in
State ID Number: 2529
NBI Number: 2529
Coordinates
Latitude: 45.5342789 | Longitude: -100
Bridge Description
Project Summary:Project Location:
I-405 / US 30 over the Willamette River in the city of Portland in Multnomah County
Impact Category:
Tier 6 (longer but reduced by months/years)
Mobility Impact Time:
Primary Drivers:
reduced onsite construction time; improved site constructability; minimized environmental impacts; reduced traffic impacts – least impact on navigational traffic; reduced life-cycle cost – least cost to build; improved work-zone safety – reduced worker exposure over waterway
Dimensions:
2,152-ft-long, three-span continuous, semi-through steel tied arch main structure (451.83 ft side deck arch span – 1,255 ft drop-in tied arch center span (ABC) – 451.83 ft side deck arch span); 6,000-ton drop-in tied arch raised 175 ft into place
Average Daily Traffic (at time of construction):
0
Traffic Management (if constructed conventionally):
Existing Bridge Description:
Replacement or New Bridge:
The bridge has an upper and lower deck, each carrying four 12-ft-wide traffic lanes and two 10-ft-wide shoulders. The cross-section consists of a steel tied arch welded box girder supporting an orthotropic steel upper deck and a concrete lower deck system. The concrete piers were on concrete footings founded on deep foundations.
Construction Method:
The arch span was built in California and floated 1.7 miles downstream of the bridge site at Swan Island, where it was assembled. It was then floated on barges to the bridge site and lifted into position using strand jacks. This construction method was selected to minimize cost and the impact on navigation.
Stakeholder Feedback:
This is a proven and common construction method for prefabricated long-span bridges over navigable waterways. Floating a fully erected span accelerates the construction schedule and reduces the workers’ exposure over the waterway, thus increases workers’ safety. It also reduces the window time of the river closure and impact to shipping traffic.
High Performance Material:
Project Planning
Decision Making Tools: State ProcessSite Procurement:
Project Delivery: Design-bid-build
Contracting: Full lane closure
Geotechnical Solutions
Foundations & Walls:Rapid Embankment:
Structural Solutions
Prefabricated Bridge Elements: Orthotropic deckPrefabricated Bridge Systems:
Miscellaneous Prefabricated: Arch span w/deck
Costs & Funding
Costs:Insufficient records to reconstruct exact cost information. Published record listed $82 million as the total cost, but the main structure alone is about half that amount. In 1973, the bridge cost per sq ft was under $140.
Funding Source:
Federal and State
Incentive Program:
Additional Information
Downloadable Resources
Contract Plans:Specifications:
Bid Tabs:
Construction Schedule:
Other Related Information:
Summary Sheet:
130204-ABC_New2_OR_1973_Fremont
Other Related URLs:
Go to:
http://www.oregon.gov/ODOT/HWY/BRIDGE/
Oregon Department of Transportation
Contacts
Bruce V. Johnson, P.E.
State Bridge Engineer
Oregon Department of Transportation
bruce.v.johnson@odot.state.or.us
503-986-3344