According to a new KING 5/Survey USA poll, more than half of Seattle residents don't think the decision to replace the Alaskan Way Viaduct with a  deep-bore tunnel is "final," and only a quarter of voters think it's "very likely" that the tunnel will be built.

Voters were asked, "Is the decision to replace the viaduct with a deep-bore tunnel final?" Fifty-one percent said no, 41 percent said yes, and 8 percent were unsure.

Asked, "How likely is it that the tunnel will be built?" 25 percent said "very likely," 39 percent said "somewhat likely," 26 percent said "not very likely," and 6 percent said "not at all likely."

Two candidates for local offices—Mike McGinn, who's running for mayor, and Mike O'Brien, who's running for City Council Position 8—oppose the $4.2 billion tunnel.

The poll's margin of error was 4.5 percent.