The Alaskan Way Viaduct
This $3.2 billion Seattle project is actually a collection of 32 individual projects that launched in 2010 to replace an outdated section of State Route 99. The most famous part is the 2-mile-long tunnel dug by the “Bertha” drill, which started burrowing into the Seattle soil in summer 2013. After a two-year delay to diagnose and repair technical troubles with the drill, Bertha finished tunneling on April 4, 2017. State and local government officials estimate the entire project will be completed in 2023.
Engineering News-Record » As Washington State Dept. of Transportation officials look toward a fall 2018 opening of the 1.7-mile-long bored tunnel under downtown Seattle that will replace the aging 1953-opened Alaskan Way Viaduct—also part of State Route 99—the final contract in the $3.3-billion project to tear down the viaduct was awarded to Kiewit Infrastructure West.
KING-TV » The Washington State Transportation Commission is expected to get a progress report Thursday on the upcoming statewide pay-by-mile pilot program, which could eventually be a gas tax replacement. Because there are more highly fuel-efficient cars these days, the state says it needs to find new ways to make up for the lost tax revenue to pay for roads.