By the time Granger High School's teens swarmed past the empty voter booths at the school's polling place at the close of school Tuesday, election workers were marveling at the low turnout.

Grand total of voters at the West Valley City school as of 2:30 p.m.: 30. It was far worse than the turnout for this year's primary election, poll worker Ardath Webb said.

"Our big rush was four at once," Webb said.

It's an off-year election -- no presidential or congressional races -- and turnout sagged even lower than usual. In the slowest election in Salt Lake County since the late 1990s, only 18 percent of registered voters showed up to cast a ballot.

Salt Lake County Clerk Sherrie Swensen wasn't surprised, not when 66,000 voters in unincorporated burbs such as Magna and Kearns had nothing but a low-profile Granite School District bond on the ballot.

But not all precincts were quite so dormant, though, with Bluffdale and Holladay registering turnout above 30 percent.

This was the first general election in which a new state law required voters to bring identification to get a ballot. Interviews with polling officials at several precincts around Salt Lake County indicated a few instances where voters had to turn to backup documents such as utility bills, but none in which a voter was turned away.

Voters interviewed as they left the polls generally said they liked the requirement or didn't care about it.

"I've always thought it was a little strange that they'd just take my word for who I was," Avenues voter Joan Lelis said. If someone in previous elections knew another voter would not show, she said, it seems they could have used that person's name to come back and vote a second time.

Analeis Larsen didn't think twice about showing her ID at the Sprague Library in Sugar House. She's young and said she's used to flashing her license.

"Everything now requires ID," she said. "You buy a Coke at the 7-Eleven with a debit card, you need ID. Maybe for an older generation it would be a problem."

In fact, Swensen said, one fear she had about the Legislature's requirement was that it could affect older voters without driver licenses. The law ended up including enough alternative ID options that few seem disenfranchised, she said.

Some voters leaving the Granger High polling place Tuesday said they believe the ID requirement will help restrict voting to U.S. citizens. But Swen-sen said there was never a risk of noncitizens voting, because registration required either a driver license or the last four numbers of a Social Security number.