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 http://kowloonland.com.hk/?big=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

Courtesy Photo, King County
Prolific tagger faces charges for damage to Kent water tower

Man one of dozens who reportedly tagged properties across King County, including West Hill tower

t
Federal Way man charged in Kent I-5 crash that killed passenger

Documents state that evidence reportedly showed he was the driver, but he blamed the passenger.

The Kent Police Department went all out with their “Moana” themed display - even Maui showed up. Photo by Bailey Jo Josie/Sound Publishing.
The Hogwarts Express pulls into Battle of the Badges | Photos

The 2024 Battle of the Badges took over the Renton Technical College on Dec. 14.

Kent Police Chief Rafael Padilla. COURTESY PHOTO, Kent Police
City of Kent crime numbers drop in 2024 compared to 2023

Vehicle thefts, commercial burglaries and robberies see big decreases

Courtesy Photo, Kent School District
Kent School District says it ‘will do better next time’ with school closures

Late notifications issued about closures after Dec. 18 windstorm

t
Kent Police arrest pair for downtown robbery of pedestrian

Reportedly used pepper spray to attack Kent man, 56, as he walked on sidewalk Dec. 16

Meeker Middle School, one of six schools closed Wednesday, Dec. 18 in the Kent School District due to power outages from a windstorm. COURTESY PHOTO, Kent School District
Windstorm causes closure of six Kent schools due to power outages

Four elementary, two middle schools closed Wednesday, Dec. 18; couple of city roads closed

Volunteers wrap gifts during the 2023 Toys for Joy program. COURTESY PHOTO, Puget Sound Fire
Puget Sound Fire puts out plea for more Toys for Joy donations

Toys needed for children ages 9 to 12; more bikes, scooters requested; deadline is Dec. 20

t
Kent man, 19, faces multiple charges after pursuit near Wenatchee

Driver reportedly fails to stop for state trooper, crashes stolen vehicle along State Route 97

Kent School District Board Director Awale Farah, left, and Superintendent Israel Vela at a high school graduation last summer. COURTESY PHOTO, Kent School District
Awale Farah resigns immediately from Kent School Board

Says because of ‘family commitments’ he cannot fulfill rest of his term that expires in November 2025

t
Kent’s Lower Russell Levee project receives John Spellman Award

City, King County Flood District and other partners recognized for historic preservation

Northwood Middle School, 17007 SE 184th St., in unincorporated part of King County in Renton and part of the Kent School District. COURTESY PHOTO, Kent School District
Calls about man trying to access Northwood Middle School causes lockdown

Deputies arrest man for investigation of resisting arrest, obstruction at Kent School District property