162nd Avenue SE at SE 166th Court Culvert Replacement Project

Previous status updates

October 14, 2020

The road closure and detour is extended through Friday, October 30. The extension is needed to ensure paving and other activities that require dry weather can be completed.

October 7, 2020

The road closure and detour is extended through Monday, October 26. Work hours will be 7 a.m. until 5 or 8 p.m. Monday through Friday with occasional Saturday work. The extension is needed to allow crews enough time to safely install the culvert. Once the road reopens, crews may need to conduct partial road closures through early November.

August 26, 2020

The full road closure and posted detour is now in effect. The road closure and detour will be in place through Wednesday, October 14 - see the travel alert. Work hours will be 7 a.m. until 5 or 8 p.m. Monday through Friday with occasional Saturday work. There may be water shut-offs during some of the work in the coming months. Residents will be notified of water shut-offs directly from the Cedar River Water & Sewer District.

Project overview

This project replaces a 167-foot-long pipe and catch basin system that controls flows from an upstream stormwater detention facility and carries Madsen Creek under 162nd Avenue SE in the Fairwood area east of Renton. The project will protect roadway infrastructure, community safety, and improve fish passage through the area. Residents living in the area should expect a full road closure between SE 166th Place and SE 166th Court along 162nd Avenue SE while crews are working. A signed detour will be in place, and local access will be maintained - see the detour route map. JPG 2MB

Project timeline

• Spring 2020
  Utility companies (Puget Sound Energy, Comcast Cable, Centurylink, Puget Sound Energy & Gas, Cedar River Water and Sewer District) relocates underground utilities.

• Thursday, August 20, 2020
  Construction begins. Crews will post traffic notices for upcoming seven-week-long road closure starting August 26.

• Wednesday, August 26 through Monday, October 26
  Construction requires a full road closure at 162nd Avenue SE at SE 166th Court. A signed detour is available. JPG 2MB

• Tuesday, October 27 through mid-December
  The road is reopened to through traffic for the remainder of the project.

• Mid-December 2020
  Project is complete

Project benefits

• Safety – The road crossing pipe is deteriorated and, in its current condition, threatens the roadway and utilities in an urban residential neighborhood. Replacement is critical to prevent sinkholes and other failure of the roadway and associated detrimental impacts to the stream.

• Fish passage – The existing pipe and catch basin system is a barrier to upstream fish migration due to a combination of the size and length of the culvert and presence of a flow control structure at the upstream end.

Work to be completed

• Replace the deteriorated corrugated metal pipe and catch basin system with a new 133-foot-long, 17-foot-wide, 10-foot-high precast concrete box culvert designed in accordance with state requirements.

• Install a weir-like control structure with a built-in fishway passage orifice and roughened channel to provide fish passage at low flows into the stormwater detention facility to the extent feasible while maintaining a minimum level of flow control from the upstream in-stream stormwater detention facility.

• Install a stormwater detention vault under 162nd Avenue SE to compensate in part for anticipated lost storage in the upstream stormwater detention facility as a result of the proposed culvert.

• Reconfigure the in-road stormwater runoff drainage system within the project footprint.

Work hours

• 7 a.m. until as late as 8 p.m. Monday through Friday

• Occasional Saturdays from 7 a.m. to 8 p.m.

Project documents

• Determination of Non-Significance (DNS) - Issued, March 24, 2020 PDF 1MB

• Environmental Checklist (ECL) - Issued, March 24, 2020 PDF 1MB

  • ECL Attachment - Project Plan Sheets - Issued, March 24, 2020 PDF 2MB

  • ECL Attachment - Road Closure Plan - Issued, March 24, 2020 PDF 350KB

• Notice of Action Taken (NAT) - Action Taken, May 20, 2020 PDF 1MB PDF

Also see

• 162nd Avenue SE Capital Improvement Program project site