Mike McGinn slams the city's contribution to the tunnel—$930 million—as the Largest Tax Increase in Seattle History. But McGinn's preferred choice, the surface/transit option, would also require similar tax increases. Even if surface/transit wins, the city will still have to rebuild the seawall, relocate utilities from the viaduct, and redevelop the waterfront.

Mayor Greg Nickels recently released his budget—his last as mayor—which described how the city will pay for their share of the tunnel:

• A $20 car-tab tax, to be enacted by the City Council in 2011, would raise $38 million by 2015.

• About $25 million in parking revenues[.]

• In all, the city transportation department would spend $375 million toward a sea wall, promenade and streets by 2015, mostly in the later years.

Nickels assumes the city could use $118 million in state grants to reduce residents' costs. Another $155 million in existing and future city bond money would be used — a debt later generations must pay.

Asked if debt would hinder the ability of future leaders to build mobility projects, Deputy Mayor Tim Ceis said, "It would be fiscally irresponsible to pay for it out of cash," because the highway and waterfront structures will last for decades.

• City Light ratepayers would spend $128 million on tunnel-related utility relocations by 2015. But next year's piece is only $5.4 million, which Finance Director Dwight Dively called "minuscule" compared with next year's revenues from power rates. He acknowledged the tunnel project could affect power bills later.

• The project includes $16 million in water projects and $30 million in wastewater spending.

But lawmakers in Olympia have made it clear that the state's contribution will be used on other projects if Seattle rejects the tunnel, so McGinn wouldn't have that money for a surface/transit option. And it's not clear if using gas-tax funds on a surface/transit option would pass constitutional muster, since gas tax funds must be spent on roads.

Paying for the utility relocation costs will probably raise City Light rates, and costs associated with rebuilding the waterfront will also be a part of the city's transportation budget for years to come. Should McGinn stop the tunnel, we'll still have to do pay for this stuff. Perhaps the right question to ask McGinn would be: How would you pay for your own plan?