The state’s viaduct replacement projects are estimated to cost $3.3 billion. Funding comes from state, federal and local sources, as well as the Port of Seattle and tolls.

May 2018 update: In December 2016, we notified the Legislature that we would need up to $149 million to complete the program. In the 2017 session, the Legislature allocated $60 million to complete the program. In 2018, they allocated $54 million in state funds and $22 million in local funds. The tables below reflect the budget as approved by the Legislature.


More Information

Tolling the SR 99 Tunnel

State projects Project status Budget ($M)
SR 99 Tunnel Project (Includes design-build project, north and south access contracts, and new north surface street connections.) Construction $2,124.7
SR 99 South Holgate Street to South King Street Project (south-end viaduct replacement) Construction $347.7
Central Waterfront Viaduct Removal, New Alaskan Way with connections to Elliott and Western avenues and the Battery Street Tunnel decommissioning Planning $328.8
Central Waterfront Construction Mitigation Ongoing $29.6
Other Moving Forward Projects:
  • Column safety repairs
  • Electrical line relocation
  • Battery Street Tunnel repairs
  • Construction mitigation for the south end viaduct replacement
  • Complete
  • Complete
  • Ongoing
  • Ongoing
Program Management   $124.8
Prior Environmental Impact Statements, Right of Way and Design Costs   $163.7
Total Use of Funds   $3,290.7
State Funding
2005 Gas Tax (Partnership Funding) $1,636.0
2003 Gas Tax (Nickel Funding) $326.4
Other State $4.8
Federal $787.2
Local $68.6
Toll $200.0
Port of Seattle $267.7
Total Source of Funds $3,290.7