Seattle Tunnel Construction in High Gear

The SR 99 tunnel is moving a portion of the north-south state highway underground. A tunnel launch pit that is 400 feet long and 80 feet deep has been built.

Road construction in Seattle and Washington state is in high gear this month, with a major tunnel project under way in the city and contractors beginning work Aug. 6 to demolish a 77-year-old bridge and construct the replacement span.

Seattle Tunnel Partners is the design-build contractor for the SR 99 tunnel, a two-level project that is part of the Alaskan Way Viaduct Replacement Program. The existing SR 99 Alaskan Way Viaduct along the Seattle downtown waterfront is coming down, with the bored tunnel beneath downtown Seattle replacing it. Environmental and other approvals for the project were secured in 2011. A tunnel launch pit that is 400 feet long, 80 feet deep, and 80 feet wide has been built for the project.

When the tunnel is completed, it will open more than nine acres of public space along the waterfront. The viaduct is at risk of failing in earthquakes, according to the Washington State Department of Transportation.

WSDOT is building several new highway bridges this year, as well, including the $8.8 million US 101 Bone River Bridge demolition and replacement project starting Aug. 6. on Willapa Bay, with a new bridge that can withstand coastal flooding and a 1,000-year earthquake event set to open in 2014. Other bridges are being built on US 101 and SR 105 using funds from a 2005 gas tax package and pre-existing state funds, according to WSDOT.

Download Center

HTML - No Current Item Deck
  • Free Safety Management Software Demo

    IndustrySafe Safety Management Software helps organizations to improve safety by providing a comprehensive toolset of software modules to help businesses identify trouble spots; reduce claims, lost days, OSHA fines; and more.

  • Comply with OSHA’s Electronic Recordkeeping Requirements

    Collect relevant incident data and generate accurate OSHA 300, 300A, and 301 regulatory reports, including 300A CSV files for easy electronic submission to OSHA.

  • Complete Online Safety Training Courses

    Deliver state-of-the art, online safety training courses to your organization with IndustrySafe Training Management Software. Generate reports to track training compliance and automatically notify learners of upcoming or overdue classes.

  • Easy to Use Safety Inspection App

    Conduct inspections on the go with IndustrySafe’s mobile app. Complete safety audits at job sites and remote locations—with or without web access.

  • Track Key Safety Performance Indicators

    IndustrySafe’s Dashboard Module allows organizations to easily track safety KPIs and metrics. Gain increased visibility into your business’ operations and safety data.

  • Industry Safe
comments powered by Disqus
Live From Safety