Sullivan Road/Trent Avenue Interchange

The city is planning to redesign and reconstruct the interchange at Sullivan Road and Trent Avenue (SR 290). This project is in the design phase. The project would include replacement of the Sullivan Road bridge over Trent and the adjacent bridge over the BNSF Railway track.

With traffic growth in the area, along with the connection of Bigelow Gulch Road to the Sullivan/Wellesley intersection, the city anticipates the interchange as currently configured will fail to handle the traffic volumes by year 2030. The bridge clearance over Trent Avenue does not meet current standards. The bridge has been repaired six times in the last 10 years after being struck by vehicles passing under. Both the bridges over Trent Avenue and the BNSF Railway will be replaced to support the additional traffic demand and allow expansion of the BNSF mainline. The length of on-ramps at the interchange also does not meet current standards.

Interchange Reconfiguration Presentation at Open House - Oct. 27, 2022
Exhibit: Roundabout fit and function at an Interchange - Oct. 27, 2022

Selecting an interchange design

The city will utilize the following criteria (in no specific order) when selecting a preferred alternative:

Vehicle and pedestrian safety	Construction costs
Level of service	Maintenance and operation costs
Environmental impacts	Freight mobility
Right-of-way needs	Community input

Four design alternatives

The city is evaluating four design alternatives for this project. These alternatives are studied more thoroughly in the Interchange Control Evaluation study prepared by the project consultant.

In addition, two aerial animated videos are available that illustrate the designs' traffic flow.

View 49-second video that illustrates traffic flow of each design in a four-quadrant screen.
View 3-minute video that illustrates traffic flow of each design in full-screen format (view entire video to see all designs).

More information regarding each design's expected level of service will be shared at the Open House on Oct. 27.

	Standard Signalized Diamond Interchange Widens Sullivan to seven lanes, two lanes in each direction, two southbound lefts and one northbound left) Signalized intersections will be used for both eastbound and westbound ramps. Increased on-ramp lengths Likely to close Progress Road access to Trent Avenue Estimated cost: $42.2 million Design exhibit board
	Diamond Interchange with Peanut Roundabout Elongated roundabout provides all turn movements of traffic for on/off eastbound and westbound ramps Increased on-ramp lengths Likely to close Progress Road access to Trent Avenue Operates best for the anticipated traffic flow in 2030 Estimated cost: $42.2 million Design exhibit board
	Diverging Diamond Interchange The northbound and southbound traffic to opposite sides at two signalized intersections n Allows unsignalized left and right turns to and from the ramps, decreasing vehicle conflicts and increasing traffic volumes Increased on-ramp lengths Likely to close Progress Road access to Trent Avenue Estimated cost: $43.1 million Design exhibit board
	Jughandle Interchange Sullivan and Trent would connect using two at-grade roundabouts Trent Avenue’s traffic speed will need to be reduced through the roundabout Increased east on-ramp length No impacts to Progress Road access to Trent Avenue Reduce high speed collisions on Trent Operates best for the anticipated traffic flow in 2030 Estimated cost: $35.2 million Design exhibit board

Project funding

The city has secured approximately $3 million to fund a portion of the preliminary engineering phase. The city will continue to apply for state and federal funding as it becomes available to purchase the required right-of-way and support the project construction, which is estimated to cost between $35.2 and $43 million.

A public Open House was held at 5 p.m., Oct. 27, at East Valley Middle School to provide more information to the community. In addition, an online survey was available to collect public feedback from mid October through Nov. 20, 2022.

Project contact

Rob Lochmiller
Project Manager
rlochmiller@spokanevalley.org
509.720.5010

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