I-90, SH-41 Interchange

Noise walls were not warranted in the analysis of the interchange, but a study is underway to look at expansion of I-90 and if it’s warranted in the corridor.

Learn more about the I-90 study.

Temporary signals will be installed during construction when the westbound off-ramp is closed for an extended period of time (anticipated in 2024) to handle extra traffic seeking alternative routes.

The design team consulted with other community partners like emergency services and law enforcement to mitigate any safety concerns with the construction of pedestrian underpasses. The underpasses will be well-lit and short enough to see through to maximize visibility and safety.

Both underpasses will be 14 feet wide and 10 feet tall, which makes them larger than the underpass to access Silverwood off US-95. The inside of the underpass under the I-90 westbound on-ramp will be visible from Seltice Way, and the underpass under SH-41 will be visible from Primrose Lane, which will help improve safety and ease of patrolling.

Modeling shows that once constructed the new interchange will be safer, more efficient and easier to navigate while being compatible with future expansion of SH-41 and I-90.

Access to businesses on SH-41 north of the interchange will remain the same, though a new median barrier will not allow left turns onto or from the highway. Access will continue to be provided primarily through side streets or signalized intersections to improve traffic flow and make it safer.

Most local roads will continue to function the same as they do now, though access to the freeway south of the interchange will be simplified. Ross Point Road will be restriped to accommodate additional street parking. Other changes to traffic control, speed limits and parking may take place after construction by the city as modifications are not supported by traffic modeling.

SPUIs control traffic at one signalized point. By using one signal, rather than two signals, to control movements, the SPUI design is expected to increase capacity and decrease travel times. This design will achieve the efficiencies of a SPUI with excellent compatibility with future expansion.

It is important to keep this interchange open to traffic during construction. If ITD could completely close the interchange, construction could occur much more quickly. This complex interchange construction project involves building significant infrastructure such as:

• 1.3 miles of I-90 pavement reconstruction
• SH-41 widening and pavement reconstruction from Seltice Way to 12th Ave
• ½ mile of widening and pavement reconstruction of Seltice Way
• Six permanent bridges
• Two temporary bridges
• Eight retaining walls
• Two pedestrian underpasses
• One pedestrian bridge
• Upgrades to intersections with three traffic signals
• One pedestrian (“hawk”) signal
• Utilities, drainage, and signage improvements throughout the project limits

Commuters from Spokane:

• Speed limits will be reduced, but other impacts will be minimal during commute times.

Businesses adjacent to the interchange:

• ITD will work with businesses to maintain access and place temporary signage for construction.

Bicyclists/pedestrians:

• ITD will maintain bicycle/pedestrian access through the construction zone. Detours will be in place whenever needed.