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Background

King County bridge engineers have identified two bridges in King County that are in need of a full deck repair. Landsburg Bridge No. 3075 and Woodinville-Duvall Bridge No. 1136E require deck rehabilitation by removing the top portion of the deck in order to construct a long-term repair. The existing deck has a history of forming potholes and scaling and this proposed repair will reduce the maintenance needed to keep the bridge serviceable. Most importantly, it will preserve the bridge deck from deteriorating faster and causing an expensive repair of the full bridge deck.

The county prioritizes repairs identified during inspections based on structural safety, traffic safety and the potential to reduce frequent maintenance. Addressing safety concerns and preserving and maintaining the existing roadway network are two of the goals in the 2014 Strategic Plan for Road Services. With limited revenues and many unfunded transportation needs in unincorporated King County, emphasis is placed on keeping existing bridge infrastructure serviceable and safe for the traveling public.

Preserving the county's bridges benefits mobility and aligns with the County Executive's priority of Regional Mobility. If King County bridges are not maintained they will degrade faster, and will need to be posted for load restrictions or closed to the public.

Both Landsburg Bridge and Woodinville-Duvall Bridge will be closed to all vehicles, bicyclists and pedestrians during construction. The work is weather dependent. Landsburg Bridge #3075 will be closed for 21 days and Woodinville-Duvall Bridge #1136E will be closed for 8 days.

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Desk 206-477-9094
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Landsburg Bridge No. 3075

Landsburg Bridge.
Landsburg Bridge No. 3075 on Landsburg Road SE near Maple Valley and Ravensdale.

Bridge information

Landsburg Bridge No. 3075 is a 130' concrete girder bridge owned and maintained by the King County Road Services Division. The bridge is located in unincorporated King County on Landsburg Road SE near Maple Valley and Ravensdale. Originally built in 1982, the bridge provides a crossing over the Cedar River between Hobart and Ravensdale for over 4,675 vehicles daily.

Detour route map 

Map of the Landsburg Bridge closure.
Download the detour route map for the Landsburg Bridge No. 3075 closure. PDF 52KB

Public outreach

Download a flyer about the bridge closure. PDF 81KB

Frequently asked questions

The purpose of the Landsburg Bridge Redeck Project is to repair the failing concrete deck by removing the deficient concrete and constructing a new concrete overlay. This project will also include the construction of new approach slabs at both ends of the bridge which will reduce vehicular impact by addressing and preventing the reoccurring settlement issues at the bridge approaches.

The Landsburg Bridge has a history of potholes and cracking that continuously develop in the concrete deck. About 10% of the bridge deck has been previously repaired and an additional 15% of the bridge deck has new potholes and delaminated areas. If the issues with the deck are not addressed properly, potholes will continue to develop which will increase maintenance cost and will shorten the lifespan of the bridge.

Photo of the deck of the Landsburg Bridge #3075 showing deck cracking and potholes.

The estimated total cost of the project is about $750,000 and it is 100% federally funded.
No, the bridge will be completely closed to the public during construction. The top portion of the bridge deck will be removed and the approach roadways will be excavated making the bridge impassable and bring concerns to the safety of the travelling public and the construction crew. The roadway at the bridge will remain closed for the duration of construction.
Landsburg Road SE at the Landsburg Bridge will be closed for approximately 21 days. The project is weather dependent.
The project will take place in July/August 2019. Exact dates are to be determined and will be posted on the project webpage and on the King County My Commute webpage.
Yes, a staged construction which would allow a single lane to remain open during construction was considered but a full road closure was selected due to many advantages. The staged construction could more than double the time required to complete the project and multiple short full road closures would still be necessary when pouring and curing concrete. A full road closure will allow the contractor to work quickly and more efficiently which equates to cost savings. A full road closure also creates a safer work zone for both the workers and the public. Full closure is necessary to limit the duration of traffic impact, prevent impact to the quality of freshly poured concrete from adjacent traffic vibration, and to increase the safety of workers and the public.
The detour route will utilize SR 169 which runs parallel to Landsburg Road SE. The detour will be marked in the field. For the detour route map, please see the map above.
The bridge/road closure will affect those who use Landsburg Road SE north of Ravensdale. The school district will not be impacted as the construction is scheduled for the summer months when school is closed. The County is coordinating with other affected parties such as fire districts, bicycle clubs, etc.
Yes, the Cedar River Trail and all adjacent parking lots will remain open during the project; however, the bridge will be impassable so the parking lots and trail must be accessed from the north.
For the latest project updates please check back here. You can also sign-up or manage your Road Alerts subscription here.

Please contact Brent Champaco for any questions or concerns that you may have:

Brent Champaco, Senior Community Relations Planner
Desk: 206-477-9094
Cell: 206-573-4267
brent.champaco@kingcounty.gov

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Woodinville-Duvall Bridge No. 1136E

Photo of Woodinville-Duvall Bridge.
Woodinville-Duvall Bridge No. 1136E on NE Woodinville-Duvall Road near the City of Duvall.

Bridge information

Woodinville-Duvall Bridge No. 1136E is a 50’ long concrete slab bridge owned by King County and maintained by the Road Services Division. The bridge is located on NE Woodinville-Duvall Road just east of West Snoqualmie Valley Road NE near the City of Duvall. Originally built in 1948, the bridge provides a crossing over a small tributary for over 8,815 vehicles daily.

Detour map  

Map of the Woodinville-Duvall Bridge No. 1136E closure.
Download the detour route map for the Woodinville-Duvall Bridge No. 1136E closure. PDF 37KB

Public outreach

Download a flyer about the bridge closure. PDF 81KB

Frequently asked questions

The 70-year-old concrete deck is cracking and is worn down to the aggregate under the wheel lines. The exposed aggregate becomes loose and separates from the concrete deck causing potholes. A new concrete overlay will protect and extend the life of the bridge which is important as traffic in the area continues to increase.

Photo of the deck of the Woodinville-Duvall Bridge #1136E showing deck cracking and potholes.

The estimated cost of the project is $250,000 and it is 100% federally funded.
No, the bridge will be completely closed to the public during construction. The top portion of the bridge deck will be removed making the bridge impassable and hazardous to vehicles, bicycles, and pedestrians. The roadway at the bridge will remain closed for the duration of construction.
NE Woodinville-Duvall Road at the Woodinville-Duvall No. 1136E Bridge will be closed for approximately 8 days.
The project will take place in July/August 2019. Exact dates are to be determined and will be posted on the project webpage and on the King County My Commute webpage.
Yes, a staged construction which would allow a single lane to remain open during construction was examined; however, the bridge deck is too narrow to consider this option. Full closure is necessary to limit the duration of traffic impact, prevent impact to the quality of freshly poured concrete from adjacent traffic vibration, and to increase the safety of workers and the public. 
The detour route will utilize NE 124th Street which runs parallel south of NE Woodinville-Duvall Road. The detour will be marked in the field. For the detour route map, please see the map above.
The bridge closure will affect those who use NE Woodinville-Duvall Road between W Snoqualmie Valley Road NE and SR 203. Local roads off of NE Woodinville-Duvall Road east of Woodinville-Duvall Bridge No. 1136E will still be able to be accessed by approaching NE Woodinville-Duvall Road from SR 203.
 
The school district will not be impacted as the construction is scheduled for the summer months when the school is closed. The County is coordinating with other affected parties such as fire districts, bicycle clubs, etc.
For the latest project updates please check back here. You can also sign-up or manage your Road Alerts subscription here.

Please contact Brent Champaco for any questions or concerns that you may have.

Brent Champaco, Senior Community Relations Planner
Desk: 206-477-9094
Cell: 206-573-4267
brent.champaco@kingcounty.gov

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