Coal Creek Bridge No. 3035A Replacement Project
Major construction begins in June 2022
May 13, 2022
Starting on Monday, May 16: The project contractor will be on site on a regular basis, Monday through Friday during daytime hours. The first order of work is to make the temporary bridge approaches wider. This change will make it easier for longer vehicles and trailers to get across the bridge. The project team is also working on a plan to improve one-way traffic over the bridge. They are considering adding either stop signs or a temporary traffic signal.
The temporary bridge has one single lane, and no weight limit restrictions on the temporary bridge. Learn more on Facebook.
On this page
- Latest update
- Project overview
- Getting through the construction zone
- Construction timeline
- Bridge history
- Construction photos
- Why King County is replacing the bridge
- Frequently asked questions
- Project documents
Contact usBroch Bender, Communications Manager
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The existing 64-year-old timber support structure is decaying, the 109-year-old steel floor beams are rusted, the paint is peeling, and the bridge has weight restrictions for heavy trucks. All traffic will use a temporary bypass bridge throughout construction until fall 2022, when the new bridge is open. The temporary bridge does not have any weight restrictions.
Work to remove and replace the existing Coal Creek Bridge on SE Lake Walker Road was originally planned for summer 2021, but was delayed one year to spring/summer 2022. The one-year delay was needed because crews are only permitted to do in-water work during late spring and summer. The new, replacement bridge, scheduled for completion in fall 2022, will carry no weight restrictions, and is expected to last for decades.
Getting through the construction zone
Travelers will always have local access in both directions over Coal Creek. King County built a temporary one-lane bridge to carry traffic over Coal Creek just downstream of the current bridge in spring 2022. There are no weight restrictions on the temporary bridge. The temporary bridge will be removed once the new, permanent bridge is built and open to traffic in fall 2022.
Frequently asked questions
The existing bridge is deteriorating and needs to be replaced. The 64-year-old timber support structure is decaying, the 109-year-old steel floor beams are severely rusting, the paint is peeling, and the curve in the road and bridge do not provide adequate visibility to oncoming traffic.
The bridge has been categorized as structurally deficient and functionally obsolete.
Structurally deficient means there are significant load carrying elements of the bridge that are in poor condition due to deterioration and/or damage or the waterway opening provided by the bridge is insufficient causing water overtopping with significant traffic delays. The fact that a bridge is “structurally deficient” does not imply that it is likely to collapse or that it is unsafe. It means that the bridge must be frequently monitored, inspected and maintained.
A functionally obsolete bridge is one that was built to standards that are not used today. Functionally obsolete bridges are those that do not have adequate load carrying capacity, lane widths, shoulder widths, approach roadway alignment, horizontal and vertical clearances to serve current traffic demand, or those that may be occasionally flooded.
As of September, 2021, the Roads Services Division bridge inspection team reports the existing bridge could only remain open if additional weight restrictions (more than there are today) were in place by winter 2022. For this reason, we will build a temporary bypass bridge and permanently close the old, existing bridge in winter 2022. Crews will return in spring or summer 2022 to remove the old bridge and build a permanent replacement. The temporary bypass bridge will not have any weight restriction.
Virtual community meeting presentation - June 22, 2021 PDF 5MB
Flyer - June 1, 2021 PDF 211KB
Flyer - July 15, 2020 PDF 631KB
Notice of Action Taken (NAT) - Issued, January 9, 2020 PDF 1MB
Determination of Non-Significance (DNS) - Issued, December 10, 2019 PDF 1MB
State Environmental Policy Act (SEPA) Environmental Checklist - Signed, November 22, 2019 PDF 5MB
Coal Creek Bridge Replacement Project: Bridge Type, Size and Location report - November 16, 2019 PDF 67MB
The Bridge Type Size and Location (TS&L) report evaluates three bridge design alternatives for the replacement of the Coal Creek Bridge. The TS&L report considered costs, environmental impacts, right-of-way acquisition, community feedback, construction phasing and staging needs and project schedule. The report is used to help King County determine a selection of the preferred final bridge design alternative to replace the Coal Creek Bridge.
Flyer - March 7, 2019 PDF 86KB