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Project Title & Location
SR 704 - Cross-Base Highway, Spanaway
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Project Description
When completed this project will provide a direct east-west highway connecting I-5 and SR 7. The Cross-Base Highway will be a new six mile, four lane limited access highway with four signalized intersections and two new interchanges.
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Contractor/Consultant
HDR, Inc. has been selected to perform the PS & E for Project #1. (Spanaway Loop Rd. to SR 7)
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Recent Progress
Plans for Approval for Project #1 (Spanaway Loop Road to SR 7, Pacific Avenue) was attained on October 31, 2006. The project team is in the process of re-designing the I-5 Southbound on-ramp at Thorne Lane to minimize right of way impact. Design Approval for the remainder of the corridor is expected in February 2007.
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Design Construction Impacts
This project will construct a new highway connecting I-5 and SR 7. To accommodate the I-5 connection, the project will modify the Thorne Lane interchange. A new southbound connector roadway will link Gravelly Lake Drive to Thorne Lane to minimize interstate traffic congestion. The Thorne Lane interchange reconstruction will be accomplished south of the existing interchange allowing motorists to use the existing facility during construction of the new Thorne Lane bridge over the interstate.
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Environmental Impacts / Compliance
During the EIS phase, the selected alternative was chosen because it avoids many sensitive areas. In locations where impacts are not avoidable, designs will minimize impacts to the environment by use of retaining walls and bridges.
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Impacts to Traffic
Project designs will incorporate sound traffic management practices to minimize impacts to motorists. Traffic impact at the existing Thorne Lane/I-5 interchange will be inevitable during construction of the new Thorne Lane I/C. Minimal disruption of I-5 traffic is anticipated.
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