Coal Creek Parkway Culvert Replacement
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Olympic Pipeline is wrapping up the last phase of their work, and the city will start to build the second half of the bridge in late April. (map). Traffic will switch to west side of the Parkway, and lanes will continue to be reduced to two (one in each direction). The project is expected to be completed in October.
| Phase I
|Bridge construction on Coal Creek Parkway followed by private utility work and paving. |
One lane closed in each direction, 24/7, between Forest Drive and SE 60th Street; one lane open in each direction.
Dec - Feb
|All four lanes open (with some periodic lane closures, most likely |
during off-peak hours).
| Phase II
Olympic pipeline will finish relocation work late April. Construction will then begin
on the second half of the bridge on the east side of Parkway. Traffic will shift to the west side
of the parkway. One lane will be closed in each direction, 24/7, between Forest Drive and
SE 60th Street; one open lane in each direction.
The Coal Creek Parkway Culvert Replacement project involves:
- Replacing a 45-year-old, deteriorating culvert under Coal Creek Parkway with a new bridge to improve public safety.
- Building a new pedestrian walkway under the bridge that will connect Coal Creek Trail.
- Stream restoration to improve salmon passage
The 27-inch thick slab was delivered in 22 concrete trucks.
Crews covered the finished concrete with wet curing blanket and followed this with a plastic visqueen cover to retain moisture as the concrete cured.
Rendering of new bridge
downstream (large image)
Relocation of complex utilities under the parkway requires the project to be done in two phases. (Routes graphic)
The city will make every effort to minimize other potential delays for motorists using the parkway. However, drivers may not be able to avoid all potential impacts over the long project timeline. It is likely utility work unrelated to the bridge construction will be necessary. This could include city maintenance work, emergency repairs, and work by private utility companies.
Bike Lane Changes
During construction, bicyclists will need to share lanes with cars for about 900 feet through the work area on Coal Creek Parkway. Downhill momentum should aid with merging and speed through most of the restricted area, before bike lanes become available again. As always, motorists and cyclists should be respectful and aware of each other. Signs will be posted to inform bikers and drivers.
As with motorists, bicyclists are encouraged to consider alternate routes, which can be found on the King County Bike Map. By October 2014, all four lanes of traffic will be reopened, with bike lanes restored on both sides of the road.
Trailhead and Parking Lot Changes
The Coal Creek trailhead and parking lot will remain closed during construction of the bridge. An interim parking lot was made available in the summer of 2013.
Coal Creek Parkway carries nearly 28,000 cars a day, is an important route for Bellevue and regional commuters and provides a corridor for a number of utilities. Ensuring it is a safe and reliable transportation route is a priority for the city. The culvert under the street near Southeast 60th Street -- essentially a nine-foot wide corrugated metal pipe that is a conduit for Coal Creek -- is deteriorating and at risk for failure during heavy rains. Over its lifespan, the culvert has been exposed to numerous heavy storms and has been corroded, scoured and undermined by high flows. Photos of aging culvert
The city has conducted a number of short-term repairs to the culvert, which have extended its lifespan. However, engineering analysis of the culvert indicates that continued short-term repairs are no longer viable. As a result, Utilities has designed a long-term solution, a 39-foot-long bridge over the stream.
The city is committed to keeping people informed about the project, both before and during construction. While it’s impossible to avoid impacts during a project of this nature, construction of the new bridge will be done in a way that reduces impacts to the traveling public and the community. We are getting the word out so people know what to expect and can plan accordingly. You can stay informed by:
- Signing up to receive alerts by email or text when this page is updated with new information;
- Requesting a meeting for your group or organization;
- Watching for message boards near the construction zone;
- Watching for updates on the city’s Facebook page and Twitter account.
| Concerns about project site (traffic barriers, flaggers, signage, construction equipment)
| Concerns about off-site or neighborhood traffic issues related to project
|| Transportation 425-452-6856|