Capitol Boulevard Project

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Capitol Boulevard & Trosper Road Intersection Improvements

Description of Project

The project is intended to address congestion at the intersection caused by the current traffic volume, and to accommodate forecasted traffic growth. 

Improvements include reconstruction of the Capitol & Trosper intersection, modifications to the northbound interchange ramps, and construction of a new street between Trosper Road and Lee Street. 

Project Start Date: 2020 (estimated)

Project Funding:  This project is funded through a $6,629,120 grant from the Washington State Transportation Improvement Board and $5,188,781 the City’s Transportation Capital Facilities Plan - Transportation Fund.

Estimated Project Cost: $11,817,901Trosper and 6th Ave Roundabouts


Feasibility and Pre-Design


The Capitol Boulevard Corridor Feasibility and Pre-Design project was to validate the transportation recommendations included in the Capitol Boulevard Corridor Plan pdf-icon-sm, Final August 2013, manage necessary or recommended changes resulting from the validation process, prepare preliminary design for the Capitol Boulevard corridor improvements from approximately M Street to Israel Road including the development and recommendation of alternatives to manage the vehicular and non-motorized traffic at the busy Capitol Blvd and Trosper Road intersection. The project includes federal funding and work will be performed in conformance with state and federal guidelines. 

With funding from a federal grant the City executed a contract with SCJ Alliance for the project work.  The work completed to date includes:

  • Development of the roadway cross-section along Capitol Boulevard
  • Preliminary corridor schematics with roundabouts, medians and traffic calming treatments for the local neighborhood street entries.
  • Development and ranking of alternatives for the Capitol/Trosper Intersection
  • Preliminary schematics for the preferred Capitol/Trosper Intersection alternative.

For more information about the work please refer to these documents:

Step Two Ranking of Alternatives pdf-icon-sm 19 MB

Capitol Blvd Corridor Drawings pdf-icon-sm 5 MB 

I-5 Trosper Road Final IJR   pdf-icon-smPDF file12 MB