Project Details

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Results Chart for Delivery Method and Financing

Delivery Method

# of Projects: 1
100% of the Results

Background informationProject Created: April 10, 2011

Project Name: Seattle Hwy 99 Alaskan Way Tunnel
Year in Operation:
Sector: Transportation
Subsector: Roads, Tunnel
Status: Design / Construction
Type: New Facility
Description: $1.35 billion 1.7 mile long tunnel portion of a larger project to replace the Alaskan Way Viaduct. This project will becomethe largest diameter deep-bore highway tunnel in the world. Dragados is teamed with Tutor-Perini to use a giant 57.5 foot diameter tunnel boring machine to excavate for the tunnel.
Delivery Method as described in the country where it's located: Design Build
Is the project still active: Yes
Comments: JV of Dragados USA, Tutor Perini, Frank Coluccio Construction, Mowat Construction, and HNTB Corp will design and build the project, which includes tunnel boring, mitigation for tunnel settlement, tunnel portals, and two operations buildings. Base price of $1.1B, with 210 million in stipends for insurance and inflation, city reimbursed utility work and up to $70million in incentive pay.

Project Locations

Address: Alaskan Way Viaduct
City: Seattle
Country: United States of America

Address: Alaskan Way Viaduct
City: Seattle
State: Washington
Country: United States of America

Souces of Project Support (Non-monetary)

Checkbox Checked Access to Land: Project is to replace the existing above grade viaduct.

Souces of Project Support (Monetary)

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From Public (Government) Sources to Producers

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Direct Cash Support

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From Public Sponsor of Project - Direct Expenditure of Appropriated Public Funds: Overall -- the replacement of the Alaskan Way Viaduct --including the tunnel, above grade portions, and approaches, etc. is expected to cost $3.1billion. $2.4 billion in committed funding from the state gas tax and from federal sources. $700 million will be raised through tolls on the bored tunnel. $300 million will be contributed by the Port of Seattle. Controversy continues over where the money will come from in the event of a cost overrun.

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From Other Public Entities - Direct Grant of Appropriated Public Funds: A portion of the amount commited by the state consists of grants from the federal government US DOT.

Project Delivery & Finance Method

Project Delivery:
All Public Finance. Public Sponsor contracts for both initial design and construction with a single entity. Public Owner operates and maintains the resulting facility.
Is there an independant checking engineer? Yes

Procurement Approach

Project Component
Based Selection
Request for
Request for
for Bids

Term for Key Components & Forms of Contract

Project Component
Initial Design and Construction
Mandatory Statutory Form
Wash DOT DB format 

Project Value (If and As Known)

Date of Estimated Project Value: January 1, 2011
Project Value
Hard Cost
Hard & Soft Costs
$1-5 Billion US
$500 Million - 2 Billion US


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