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

162nd Avenue SE map.

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 – Puget Sound Energy, Comcast Cable and Centurylink construction crews will prepare the site to relocate underground utilities. Cedar River Water and Sewer District will also relocate its water main at the 162nd Avenue SE/SE 166th Place intersection. Puget Sound Energy & Gas will also relocate their gas line connection at the 164th Place SE @ SE 165th Way within the vicinity of the gate separating the Fairwood Division 15 and Woodside subdivision.
Late summer through early fall 2020 – Construction.

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.