Kummer Bridge on State Route 169 closed due to safety concerns

The state Department of Transportation sprayed concrete over soil nails last summer to try to control the unstable soils beneath the Green River Bridge piers on State Route 169. However

The state Department of Transportation sprayed concrete over soil nails last summer to try to control the unstable soils beneath the Green River Bridge piers on State Route 169. However

The much-used Kummer Bridge over the Green River on State Route 169 was closed last week because a slowly moving landslide threatens the stability of the bridge, according to the state Department of Transportation.

The closure last week could last up to six months in order for the state to make repairs, estimated at about $10 million.

The closure of the 80-year-old bridge knocks out an important route for travelers and commerce heading to Enumclaw and the Cascade mountains. State Route 169 begins in Renton.

According to the state, about 9,000 trips are made across the bridge each day, including police and fire crews.

The state has set up two detour routes for traffic, one for passenger vehicles and one for commercial trucks.

Drivers can download the maps at www.wsdot.wa.gov/Projects/SR169/GreenRiverRepair/Detour.htm.

The detour for commercial vehicles starts at Four Corners in Maple Valley, proceeding east on Kent-Kangley Road, then southeast on Retreat-Kanasket Road, then southwest on Southeast Veazie-Cumberland Road, to Southeast 392nd Street and finally to Southeast 400th Street at SR 169.

The detour route for passenger vehicles begins at Southeast 400th Street on the south and at Southeast Auburn-Black Diamond Road on the north.

Jamie Holter, a spokeswoman for the state transportation department, said local traffic can go all the way to the bridge from either direction, but vehicles cannot cross the bridge.

The state initially posted people at the bridge to ensure no one crossed and then put up concrete barriers, she said.

“We are worried about people breaking through the barrier,” she said.

Drivers can follow project progress at www.wsdot.wa.gov/projects/sr169/greenriverrepair/.

After reviewing data gathered by electronic sensors in the landslide zone near the bridge in Black Diamond, state transportation geotechnical engineers determined the structure is vulnerable to significant land movement, according to the state.

So far, the ground has moved about an inch, Holter said.

The closure of up to six months will allow for significant long-term repairs, according to the state.

Last summer, the state completed repairs it thought would stabilize the ground, which is pushing against bridge piers.

“I can’t emphasize enough that this closure is about safety,” said Paul Hammond, the state transportation secretary. “We will do what is necessary to keep the public safe and preserve the bridge.”

State engineers believe the recent heavy rain could have aggravated the soil movement. They are concerned the soil may not be able to support one of the southern-most bridge piers. If the soil slides, the pier could move with it, according to officials.

The repair includes two steps, according to the state.

First, crews will remove excess water by clearing trenches, unplugging manholes and installing pumps to help drain water from the unstable hillside.

Second, crews will excavate the soil that is putting pressure on the bridge pier. They will dig out a section of roadbed 30 feet deep and 300 feet long just south of the bridge and replace it with lighter-weight material.

All the work will be done as an emergency contract and will cost about $10 million. This is a rough estimate as the details have not been worked out.

Talk to us

Please share your story tips by emailing editor@kentreporter.com.

To share your opinion for publication, submit a letter through our website https://www.kentreporter.com/submit-letter/. Include your name, address and daytime phone number. (We’ll only publish your name and hometown.) Please keep letters to 300 words or less.

More in News

One of two victims identified in fiery Kent crash

Kristen Anne Meyers, 53, died in May 11 crash on West Hill, according to medical examiner

City-owned ShoWare Center in Kent loses $742,675 in 2023

Losses lower than projected but expenses continue to exceed revenue at 6,200-seat arena

Kent firefighters extinguish two fires on the same morning | Photos

Friday, May 17 at apartment leasing office in the Valley and at a vacant East Hill house

Courtesy Photo, City of Kent
City of Kent population drops by 1,051 in 2023 compared to 2022

Decline similar to many cities of 50,000 or more across the nation, according to U.S. Census Bureau

Kent Police Blotter: April 25 to May 8

Incidents include burglaries, robberies, shootings

Rape charges dismissed against former Kent school bus driver

Prosecutors decide they could not prove the charges beyond a reasonable doubt due to medical tests

Feds indict 9 South King County residents on drug trafficking charges

Those accused from Federal Way, Kent, Renton, Enumclaw

A screenshot of King County Councilmember Reagan Dunn speaking about a proposed amendment for the proposed $20 minimum wage ordinance. (Screenshot)
King County approves $20.29 minimum wage for unincorporated areas

Councilmember Reagan Dunn and more than a dozen business owners argued tips and health care expenses should be a part of the new wage. The council passed the ordinance without the amendment.

Dave Upthegrove. COURTESY PHOTO
Upthegrove one of seven candidates for state lands commissioner

His King County Council member’s district includes part of Kent

COURTESY PHOTO, King County Elections
Candidates file for Kent-area races for Congress, Legislature

Incumbents face challengers in two Congressional contests and four state House races

Two die in single-car crash in Kent on West Hill

Sedan crashed Saturday evening, May 11 into tree and caught fire in 2400 block of South 272nd Street

Spanaway man, 25, faces murder charge in Kent bar shooting

Reportedly shot Federal Way man, 30, eight times inside Meeker Street Bar & Grill