I-5 Portland Avenue to Port of Tacoma Rd.
Tacoma/Pierce County, Washington
Start Date: January 2015
End Date: Mid 2018
Just north of the Tacoma Dome, this $134 million project widens I-5 from Portland Avenue to the Port of Tacoma Road to provide room for a new HOV lane in each direction and four general-purpose lanes in each direction. Working with the Washington Dept. of Transportation, Hamilton will rebuild the I-5 Puyallup River bridge, reconstruct the I-5/SR 167 interchange, improve the Portland Avenue interchange and repave all the lanes on I-5 within the project limits.
This project will provide a number of benefits to motorists: Improved safety, seismic upgrades, improved traffic flow, environmental improvements, and an Intelligent Transportation System (ITS) upgrade which will allow WSDOT to respond more quickly to highway incidents and reduce traffic delays.
As General Contractor on the project, Hamilton's work includes the construction of a nine span (1,600' long x 100' wide) precast girder bridge across the Puyallup River, as well as a four span (820' long x 40' wide) curved steel plate girder bridge for a new NB off ramp. Bridges are founded on 8-10' diameter drilled shafts, CIP (cast-in-place) columns and X-Beams. Thirty spans of workbridge will be required to access the river bents, as well as major shoring required on the levees of the river. Other structural work includes 23 retaining walls of various types, deck repair, joints, end panel replacements on two existing I-5 bridges, three sign bridges, four cantilever signs, as well as deep 60 and 72" storm sewer replacement with major shoring and CIP encasement work. Ground improvement work includes stone columns, cement deep soil mixing (CDSM), Jet Grout, Micropiles, lightweight fill, and embankment grouting along with an elaborate settlement monitoring system. Other work includes a large civil package, electrical, signing, asphalt and concrete paving, etc. as well as a major traffic control effort on a very congested section of I-5.
Photo credit: Washington Dept. of Transportation