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Posted on: March 8, 2017

35th Avenue SE Reconstruction Slated to Begin in Early 2018

35th Avenue SE project map

The City of Mill Creek’s 35th Avenue SE reconstruction project is slated to begin in early 2018, according to City Engineer Scott Smith. At the City Council meeting on March 7, Smith provided a project update.

The City is undertaking a reconstruction project to fix the road between 141st Street SE and 144th Street SE to eliminate flooding and associated road closures.

“Reconstruction is timed to coordinate with Snohomish County’s project to widen Seattle Hill Road between 35th Avenue SE and 132nd Street SE,” said Smith. “Each project is the detour route for the other, so both should not be under construction at the same time to minimize impact to our community.”

The construction of the County project will occur first, likely starting in spring 2017, and should take most of the year to complete. The 35th Avenue project could be advertised for bids in late 2017 or early 2018 with construction starting that spring; construction will take approximately eight to 12 months to complete.

“It is important to note that our construction schedule is dependent on the county’s Seattle Hill Road project,” said Smith. “Any delays will impact our start date.”

The three-lane minor arterial carries approximately 15,000 vehicles per day. The road was widened by Snohomish County in 2003 by using lightweight fill on top of a large peat deposit. The road has been continually settling.

One of the biggest areas of settlement is over the Penny Creek crossing between 144th Street SE and 141st Street SE, which also has the deepest deposit of peat material as a base. The water level in the surrounding wetlands also has increased due to several factors such as upstream development and downstream beaver activity. The rising water combined with a sinking roadway has resulted in several road closures over the past few years due to flooding.

The work includes raising the road elevation up to four feet. In addition, the work includes treating stormwater from the roadway, which currently flows directly into the adjacent wetland without any treatment. Water quality and the method of distribution into the surrounding wetlands will be improved.  Fish and wildlife will indirectly benefit from the improved water quality resulting from stormwater runoff treatment.

“After meeting recently with the Army Corps of Engineers, we are pleased to report that not only are we improving the area, there is no impact to fish passage,” said Smith.

The total cost is estimated at approximately $5.5 million. The State Department of Transportation office has included a $4 million funding package for this project by the City of Mill Creek. This funding will become available in 2017. The remaining funding will be provided through the City’s Real Estate Excise Tax fund.

An open house with detailed information will be held closer to the project start date. See additional project information at

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