WSDOT installed a new, larger culvert that carries Coe Clemons Creek under SR 203 in Duvall. The new culvert is 12 feet high, 25 feet wide and 76 feet long. The culvert was replaced during an 11-day highway closure, which is condensed into this one minute timelapse video.
In addition, WSDOT worked with the City of Duvall to add new sidewalks and improved lighting to the bridge over the culvert as part of a longer-range city project to improve pedestrian safety and access on the highway.
The new culvert significantly decreases the risk of highway flooding or even failure. The old 6-by-6 foot culvert simply wasn't large enough and often became blogged with branches, leaves and other debris. Water in Coe Clemons Creek often backed up over the top of the culvert, with only the highway holding it back. Replacing the culvert reduces the erosion that was occurring on the banks of the highway. If the erosion continued, it would result in the eventual failure of the culvert and highway.
New sidewalks and better lighting on SR 203 directly over the new culvert improves pedestrian access and safety as part of the City of Duvall's longer-term improvement plan.
| Protects Environment
The new culvert allows water, sediment and debris to flow more easily under the highway. It is a more inviting habitat for fish with improved access to the Snoqualmie River.
| Economic Incentive
There is a reduced need for WSDOT maintenance staff to manually unclog the culvert. The new culvert allows debris and sediment to pass more easily.
There is also less risk that SR 203 could be severely damaged by water overflowing from the creek. Such damage would result in expensive emergency repairs.
Partnerships & Cooperation
WSDOT worked closely with the City of Duvall to schedule the work and a closure of the highway to replace the culvert. Combining resources allowed WSDOT and the city of extend outreach to residents, businesses and drivers.
WSDOT also partnered with the city to add sidewalks and improved lighting on the highway over the new culvert as part of the city's long-range plan to improve pedestrian safety and access on the highway.
|Financial Data for PIN 120305A|
||Amount ($ in thousands)|
|2003 Gas Tax (Nickel Funding)
|2005 Gas Tax (TPA)
|Pre-Existing Funds (PEF)
15700 Dayton Ave. N.
Seattle, WA 98133
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