Skip to Content
Streetsblog USA home
Streetsblog USA home
Log In
Around the Block

Who’s Gonna Get Stuck With the Bill for Seattle’s Highway Tunnel Misadventure?

The bill’s about to come due for Seattle’s costly tunnel boring boondoggle. Who’s going to pay?

Three years behind schedule, Bertha, the boring machine carving out a gigantic underground highway beneath downtown Seattle, poked through the end of its tunnel this week. After a spectacular breakdown early in the boring journey, the highway tunnel project, originally slated to cost $3.1 billion, is now expected to cost at least $4 billion when all is said and done.

Who's going to pay? Seattle residents never embraced the highway tunnel -- they voted against it in 2007, then were cajoled by project boosters into voting for it four years later. But they may have to pay for the overruns, as Republican state lawmakers try to pin those costs on the city of Seattle [PDF].

Doug Trumm at the Urbanist reports on the risk that the city will end up eating the excess cost of a project it never needed:

From the outset of the project, the popular opinion of replacing the Viaduct has been met with skepticism. In 2007, Seattle voters were presented with an advisory vote on competing Viaduct replacement options: elevated and tunneled. More than 100,000 voters turned out to register their widespread rejection of both proposals with 70% against the tunnel and 55% against an elevated version. This was in spite of civic leaders like Mayor Greg Nickels pushing the tunnel and years of public campaigning for replacement. But that didn’t stop backers of the tunnel -- Governor Gregoire, the Downtown Seattle Association, the Port of Seattle, and waterfront interests -- from turning the levers in favor. Only after another four years of campaigning did this Seattle brain trust materialize a low-turnout win in 2011 on a non-binding advisory vote for building the tunnel.

Billed as a way to reconnect Downtown Seattle to its waterfront, what wasn’t made clear at the time was that the new tunnel would not remove the need for a wide surface-level highway. Since then, the auto-focused surface highway plan has come into focus and it’s unlikely to create an especially pleasant experience for pedestrians or bicyclists. With ferry queuing lanes on the new Alaskan Way, the replaced road will balloon out to nine lanes wide.

The other elephant in the room -- elephant also being the symbol of the Republican Party -- while exurban Republicans bill the Viaduct replacement as a local Seattle project, in reality it will be used by motorists from across the region. The project has no Downtown exits showing that it’s a project allowing travel through Seattle rather than serving typical trips within the city itself. And while the total daily traffic counts on Seattle Department of Transportation (SDOT) right-of-way has been flat for years, much of the increased freeway congestion (WSDOT right-of-way) is linked to suburban sprawl and long commutes. Residents of Seattle increasingly use transit, which has allowed transit to absorb much of the trip demand from the city’s rapidly growing population. Our population has grown by more than 100,000 people since 2004, but SDOT’s daily traffic estimate is lower today than it was in 2004. Seattle itself doesn’t need the increased capacity that the tunnel and surface highway together provide; if anyone does, it’s the suburbs.

Trumm's full post is worth a read -- it's a great account of the politics that foisted this damaging highway project on the city.

More recommended reading today: Greater Greater Washington breaks down new Census data showing that sprawling metros are seeing faster population growth than more compact regions. And NextSTL breaks down the vote in St. Louis to expand transit and reject a sports stadium.

Stay in touch

Sign up for our free newsletter

More from Streetsblog USA

Wednesday’s Headlines Have Consequences

The Trump administration's actions on climate change have consequences for future generations. Industries might not like what they get in return.

February 18, 2026

Trump’s Canada Bridge Tantrum Could Be Bad News For An International Bike Trail

A multi-use trail along the Gordie Howe Bridge would be a key component of an epic cross-continental trail route — if Trump doesn't prevent the entire structure from opening.

February 17, 2026

Disturbing Utah ‘Bikelash’ Bill Takes Aim at Salt Lake City Traffic Calming

Utah state legislators aren't traffic engineers — so why are they writing laws that would force the review of specific bike lanes already on the roads in their capitol, and preemptively stop Salt Lake from building more?

February 17, 2026

The Explainer: How Big Tech Push For Cheap Car Insurance Hurts Victims

In New York State, Gov. Kathy Hochul is distorting the notion of "affordability" to do Big Tech's bidding.

February 17, 2026

Tuesday’s Headlines Let Kids Be Kids

Cops should not be arresting parents for letting their kids walk or bike around the neighborhood.

February 17, 2026

Monday’s Headlines Slow Down

Cities have proven measures they can put into place to slow down speeding drivers and save lives.

February 16, 2026
See all posts