How much does the SR 99 Tunnel Project cost?

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The SR 99 Tunnel Project is estimated to cost $2 billion. The $2 billion cost includes Seattle Tunnel Partners contract with WSDOT for $1.35 billion as well as other projects that will connect the SR 99 tunnel with a mile-long stretch of new highway near Seattle’s stadiums at the south end of the tunnel and Aurora Avenue North at the north end of the tunnel. Additionally, new ramps and connections to city streets will be built.