The viaduct vote: what you need to know

For Seattle's first vote-by-mail election, ballots must be postmarked by Tuesday. There are no polling places.

One ballot measure asks city voters if they prefer replacing the Alaskan Way Viaduct with a tunnel. The other asks if they prefer a new viaduct. The vote is advisory.

Here's what you need to know to cast your ballot:

• To mail in your ballot, you will need a first-class stamp.

• If you would rather drop off your ballot, take it to the King County elections office, 500 Fourth Ave., Suite 553, Seattle. It will be open from 7 a.m. to 8 p.m. Tuesday.

Other drop-off sites, all open 7 a.m. to 8 p.m. and Tuesday:

• High Point Community Center, 6920 34th Ave. S.W.

• Rainier Community Center, 4600 38th Ave. S.

• North Seattle Community College, 9600 College Way N.

• Interbay Evangelical Covenant Church, 3233 15th Ave. W.

• If you have not yet received a ballot, and you are registered to vote in Seattle, you can get a ballot in person until 8 p.m. Tuesday at the King County elections office. Election workers recommend you call 206-296-VOTE (8683) first, to check whether you are eligible to vote in this election.

You can also go online to check whether you are eligible to vote: www.metrokc.gov/elections/pollingplace/voterlookup.aspx.