Next major construction phase begins on light rail bridge

by

Contractor now begins work suspended over the Willamette River as bridge deck concrete pours begin

Wednesday, April 24 marks a major milestone in the building of the Portland-Milwaukie Light Rail Transit Bridge with the first bridge segment pour suspended over the Willamette River. Kiewit Infrastructure West, the bridge contractor, casts the first of 78 concrete segments for the bridge deck as it begins to take shape and extends out over the water.

Two concrete form travelers have been erected at each end of the west bridge tower. Each form traveler will support 200 tons of concrete to be cast into a 16 foot long x 75 foot long segment that will make up the future roadway.

Crew members installed form travelers at each end of the West Tower pier table the yellow-object on the left

Crew members installed form travelers (the yellow-object on the left) at each end of the West Tower pier table.

The second of two form travelers is attached to the West Tower

The second of two form travelers is attached to the West Tower.

More facts about the Portland-Milwaukie Light Rail Transit Bridge deck pour

Form travelers (blue and yellow) used to construct bridge deck, and tower crane.

Form travelers (blue and yellow) used to construct bridge deck, and tower crane.

  • Portland-based Ross Island Sand and Gravel is supplying the high-strength concrete for the pour, as well as all concrete for the entire bridge construction.
  • A concrete pumper truck, located on the temporary work bridge, will pump 100 cubic yards of concrete mix to the form traveler, via a large pumping mechanism.
  • 200 tons of concrete will be poured to make up the 16-foot long by 75’ wide section of roadway.
  • After the first segment is poured on the west side of the tower on Wednesday, April 24, the east side of the tower deck pour will occur on Tuesday, April 30. The concrete will have anchors cast into the concrete that will secure the cable stays once installed.
  • Once the concrete achieves a specified strength, post-tensioning tendons (treated-steel cables) are pulled tight by a jack before the form traveler is moved. Then the permanent cable stays are pulled from the west side of the bridge deck through the bridge tower and reconnected on the east side of the deck.
  • This process will be repeated weekly
  •  With roughly 1,720 feet of roadway to complete, this is the first of 78 deck concrete pours that will occur over the next year.
  • The bridge deck segments constructed from each tower are expected to join together in spring 2014 at the bridge center point over the Willamette.

Economic benefits of the project – creating jobs

  • 384 firms are/have worked on the Portland-Milwaukie Light Rail Transit Project, 107 of which are minority/women-owned and emerging firms (DBEs).
  • 2,914 direct jobs as of April 10, 2013 (1,981 on-site construction; 933 professional and technical).

About the Portland-Milwaukie Light Rail Bridge

The light rail bridge is the first bridge built across the Willamette River in Portland in more than 40 years, and will be the first cable-stayed bridge for the region, extending 1,720 feet (.326 miles) over the Willamette River. It is the first of its kind, carrying light rail, buses, bikes, pedestrians and a future Portland Streetcar extension, but no private vehicles.

About the Portland-Milwaukie Light Rail Transit Project

The 7.3-mile project is the region’s sixth MAX construction project to be built and extends from the terminus of the MAX Green and Yellow lines at Portland State University in Downtown Portland to South Waterfront, SE Portland, Milwaukie and North Clackamas County. About the project:

  • 7.3 miles
  • 10 stations
  • The first of its kind multi-modal bridge will carry light rail, buses, bikes, pedestrians and a future Portland Streetcar extension over the Willamette River, but no private vehicles.
  • TriMet’s share of the $1.49 billion project is less than 5 percent.
  • Opens in September 2015
  • Expands the MAX system to 60 miles and 97 stations

Project partners

The Federal Transit Administration, State of Oregon, Clackamas County, Metro, City of Milwaukie, Multnomah County, City of Oregon City, Oregon Department of Transportation, City of Portland, Portland Development Commission and TriMet.