The county’s elections office has left Renton for familiar territory.

Forced out of Renton by the potential for massive flooding of the Green River, the elections office opened its new headquarters Monday at Boeing Field in a spot from which – on a temporary basis – it once ran the operational side of the county’s elections.

The office is at 9010 East Marginal Way S. in Tukwila in a county-owned building.

The move was made quietly last week.

The county consolidated all of its elections functions in the state-of-art, highly secure building in Renton in 2007.

Whether the elections office returns to Renton and Grady Way is still uncertain.

“We are saying it’s temporary,” elections office spokeswoman Megan Coppersmith said. “It’s really a wait-and-see kind of thing.”

The county will keep the Renton address as the elections office’s mailing address, said Coppersmith.

When the elections office returns depends on the repairs the U.S. Army Corps of Engineers is making to Howard Hanson Dam, a flood-control project on the Green River in the Cascades. Final repairs could take several years, although the corps expects to have an initial fix – a grout curtain – to slow the leak done by early November.

The dam’s storage capacity has been reduced because of damage to one of the dam’s abutments, caused in last January’s fierce storm.

The county has estimated that floodwaters could reach 10 feet deep at the building it owns at 919 S.W. Grady Way. There are two other key county facilities nearby, the sewage-treatment plant and the headquarters of the Department of Development and Environmental Services.

The county had 70 permanent employees at the Renton office and during an election, had about 500 temporary workers to process and count mail-in and other ballots.

The 24-hour ballot drop box will remain outside of the former Renton elections office in the Earlington Business Center.

Now, all election services will take place at the Tukwila location including:

• In-person voter registration

• All mail ballot processing

• Accessible voting: Oct. 14 to Nov. 3

• Ballot drop box, open during business hours

The office is located off Interstate 5, adjacent to Boeing Field, just north of the Museum of Flight, at the intersection of 90th Street and East Marginal Way South.

General parking is available behind the building.