A driver navigates his way through standing water at the intersection of Ash Way and Maple Road near the Alderwood mall during afternnoon rain in 2011. (Herald file)

A driver navigates his way through standing water at the intersection of Ash Way and Maple Road near the Alderwood mall during afternnoon rain in 2011. (Herald file)

County, Lynnwood to partner to fix sinking intersection

$7M project will raise the intersection of Ash Way and Maple Road, which was built on a peat bog.

LYNNWOOD — The intersection at Ash Way and Maple Road was built on a peat bog. That’s been a documented problem as far back as 1998.

The peat can’t support that kind of weight, and the crossing has been sinking about an inch a year. Adding more pavement just makes the road heavier, and worsens the problem, said Robert Victor, a project manager for the city of Lynnwood. Now a permanent fix is scheduled.

Maple Road is considered a critical east-west link around Alderwood mall. Snohomish County, which owns part of the intersection, is partnering with Lynnwood. They are sharing construction costs of about $7 million, said Steve Thomsen, the county public works director.

The plan is to drive 8-inch-wide steel piles into the solid ground beneath the peat. It will require hundreds of piles, each averaging 50 feet long, Victor said. Similar systems are used to support piers and bridges.

The work is designed to raise the road about five feet. That would bring it above the 25-year floodplain for Swamp Creek. Where it sits now, the intersection has to be closed several times a year for flooding, said Jared Bond, Lynnwood’s environmental and surface water supervisor.

“There are bathtubs that happen whenever we get a large rain,” Victor said.

That affects traffic for the mall as well as Costco and surrounding businesses.

The construction includes about 700 feet of Maple Road and 600 feet of Ash Way. It is scheduled to start in spring 2018, after an open house, and could last five months. The road will be closed during the work, as well as the nearby Interurban Trail, with detours planned.

“We’re trying to get it done in the summer before shopping season,” Victor said.

About 7,300 vehicles travel Ash Way each weekday and about 5,900 use Maple Road. After construction, drivers are unlikely to notice the piles, which will be covered with infill.

The project includes culvert improvements for fish passage as part of a statewide court ruling.

Lynnwood has similar problems — roadway sinking into peat — on 196th Street SW near Wilcox Park and Scriber Creek and on 44th Avenue W near I-5.

Rikki King: 425-339-3449; rking@heraldnet.com. Twitter: @rikkiking.

Talk to us

More in Local News

Garry Clark
Economic Alliance Snohomish County names new CEO

After nationwide search, Garry Clark, a Nebraska business advocate, will take the helm in February.

A Mob City jammer, "CMonster," skates in a holiday scrimmage at the Everett Skate Deck on Dec. 9, 2018. An online fundraising effort has been started to help support the skating venue during the pandemic. (Anthony Floyd photo)
Skate Deck hopes to open for customers, not take donations

A roller skating coach has launched an online fundraiser, wants to help the place he fears may close.

The Lynnwood Link light rail extension breached the 25% milestone for construction in Mountlake Terrace shot on Wednesday December 16, 2020. (Kevin Clark / The Herald)
Sound Transit projects ahead could need another $11.5 billion

Costs for construction and property have soared as revenue dropped during the pandemic.

Man shoots alleged intruder in Everett

Police were investigating after a male was shot and hospitalized.

Marysville Pilchuck High School senior Katelyn Leary is a recipient of the 2020 Legion of Valor Bronze Cross for Achievement Award. (Marysville School District)
Marysville Pilchuck senior wins Bronze Cross achievement

Goodie bags in Granite Falls connect teacher with her students Missing the… Continue reading

Man and cat die in Everett apartment fire

Firefighters responded to a smoky second-story unit. A cigarette may have set a mattress on fire.

$300 unemployment supplement headed to bank accounts

The Federal Pandemic Unemployment Compensation will be available for up to 11 weeks.

Scarcity of vaccine doses slows rollout in Snohomish County

Despite qualifying for the vaccine, people over age 65 may have to wait weeks for a shot.

Idamae Schack died Jan. 7 at age 102. She and her husband John Schack gave millions of dollars to support local arts and cultural organizations. The Schack Art Center is named in their honor. (Michael O'Leary/Herald file photo)
Idamae Schack, an angel of the arts in Everett, dies at 102

She and her husband John Schack donated millions of dollars to support cultural causes in Everett.

Most Read