TR-54 228th Avenue SE & SE 40th Street Improvements

Summary

As the principal arterial street in the City, 228th Avenue SE is vitally important to residents as a major route for getting on and off of the Sammamish Plateau. The road runs north-south through the heart of Sammamish and provides access to numerous schools, parks, and commercial and residential facilities. Its intersection with SE 40th Street is located adjacent to new high school and elementary school developments proposed by the Issaquah School District.  To mitigate the impacts of increased vehicle traffic, the City plans to implement the use of a Continuous Green "T" intersection. This configuration utilizes a raised center median and striping to physically separate the southbound through traffic from the other movements at the intersection.  Additional improvement include modifications to the median on SE 40^th Street, creation of a center turn lane on 228^th Avenue SE, and widening of the asphalt to the west, south of SE 40th Street, to allow extension of center turn lane on 228^th. This project is part of the City's Transportation Improvement Plan.  For more information about this plan, please visit:

https://www.sammamish.us/government/public-works/transportation-planning/improvement-programs

Construction Information 

Project Updates

September 14th, 2023

The project team is in the process of scoping for the project and will soon be publishing a formal request for qualifications. Please continue to check this webpage for updates to the project.

Timeline

Request for Qualifications.............................Fall 2023          

Preliminary Design.................................Summer 2024

Construction.............................................Summer 2025

Budget

Design:  $80,000

Construction:  $620,000

Project costs are based on planning level estimates for road widening, raised median turning lane, and SE 40th Street median improvements.  

Goals and Benefits

The goal of this project is to implement intersection improvements that will accommodate planned growth and maintain the City's character.