Coal Creek Bridge No. 3035A Replacement Project
Monday, August 2, 2021
We successfully finalized a project contract with our contractor in July 2021. We are now working with our construction contractor to determine a revised start date and schedule for the project. At this point, there is a possibility we won’t be able to start work this summer. More information will be available later this month.
Learn what to expect during construction: We held an online community meeting about the project on June 22. See a recording of the live meeting presentation on Facebook . Here is a copy of the PowerPoint presentation PDF 5MB. For additional information, or to get a copy of the presentation in another format, please email BBender@kingcounty.gov .
King County plans to begin work to remove and replace the Coal Creek Bridge on SE Lake Walker Road this summer. The 63-year-old timber support structure is decaying, the 108-year-old steel floor beams are rusted, the paint is peeling, and the bridge has weight restrictions for heavy trucks. The new bridge structure will be open to all vehicles, carry no weight restrictions, and is expected to last for decades.
Getting through the construction zone
King County will build a temporary one-lane bridge to carry traffic over Coal Creek just downstream of the current bridge. There will be no weight restrictions on the temporary bridge. When the temporary bridge is open to traffic, workers will close and remove the existing bridge. Travelers will always have local access in both directions over Coal Creek.
- Pre-construction utility relocation: June/July 2021
- Equipment on site: Summer 2021 - Spring 2022
- Temporary bridge opens: August 2021
- Construction complete (anticipated): Spring 2022
- Built in 1958 with timber creosote substructure
- Used recycled superstructure from a different bridge
- Is sole access bridge - serves single family and mobile homes
- Is two-lane single span bridge, 41 feet long and 18 feet wide
- Has 310 vehicles per day including about 5 trucks per day
On this page
June 1, 2021 - Flyer PDF 211KB
July 15, 2020 - Flyer PDF 631KB
March 7, 2019 - Flyer PDF 86KB
Contact usBroch Bender, Communications Program Manager
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Why King County is replacing this bridge
Frequently asked questions
The existing bridge is deteriorating and needs to be replaced. The 63-year-old timber support structure is decaying, the 108-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.
Yes. The Road Services Division bridge inspection team has inspected the bridge every 6 months since 2017 to ensure the bridge is safe for vehicular traffic under current weight restrictions. This is more frequent than the required 24-month inspection cycle. If repairs are needed due to findings during the inspections, the inspection team works with our maintenance staff to perform the work to keep the bridge safe for public use until the bridge is replaced.
4 Axles – 26 tons
5 Axles – 30 tons
6 Axles – 32 tons
7 Axles – 35 tons
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.
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