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Contractor team selected for Sellwood Bridge

Multnomah County Press Release - July 1, 2011

Multnomah County has awarded the Construction Manager/General Contractor contract for the Sellwood Bridge project to Slayden-Sundt, a joint venture of Slayden Construction Group and Sundt Construction, Inc. The partnership submitted the winning proposal based upon qualifications and fee and was selected from a field of six proposers. Both companies have experience building large transportation projects and working in the Pacific Northwest.

Slayden Construction Group is based in Stayton, OR. Slayden recently completed a $45 million Design-Build bridge project on Highway 38 (Elk Creek to Hardscrabble Creek Bridges) near Drain, OR, and is currently working on a $46 million Design-Build bridges project (I-5 Elkhead Road to Highway 126 Knowles Creek) near Cottage Grove.

Sundt Construction, Inc. is based in Tempe, AZ. Recent Sundt projects include the $200 million widening of Interstate 10 in Tucson and the $180 million widening of State Route (Loop) 202 in Phoenix.

The Sellwood Bridge project is Multnomah County's first transportation project to use the Construction Manager/General Contractor (CM/GC) contract method. In CM/GC, the construction team is hired during final design to provide input that can help reduce costs, risks and schedule time. When final design is completed in 2012, the contractor team will submit a guaranteed maximum construction price. After the county and the CM/GC agree on a price, the contract will be amended authorizing the CM/GC to build the new bridge.

"We look forward to working with the Slayden/Sundt team to complete construction of the new Sellwood Bridge as quickly and affordably as possible," said County Commissioner Deborah Kafoury, whose district includes the bridge. "We think the CM/GC contract method will reduce risk and give us more certainty about the project's cost. The contractor team has already made suggestions that will lower our costs."

The contractor team has extensive experience in CM/GC project delivery, including the $150 million I-5 Willamette River Bridge Project in Eugene. Some techniques and objectives the contractor intends to use on the Sellwood Bridge project include:

  • Building the new Sellwood Bridge river spans in one phase by constructing a temporary shoofly (detour bridge) 40 feet north of the existing bridge. The detour bridge will reduce the project's cost by $5 million to $10 million, shorten construction time, improve safety and reduce environmental impacts.
  • Scheduling and phasing to mitigate construction impacts to the community, traffic, and the environment.
  • Utilizing effective sustainable practices during construction.
  • Maximizing diverse participation by subcontractors and workforce in the project.

The project is in the final design phase. Construction of the detour bridge could begin as early as December 2011, while construction of the new bridge is scheduled to begin in July 2012. The tentative target date for project completion is the end of 2015, but the construction schedule is still in development.