I-15 / US-20 Connector Study

BMPO wishes to thank the Idaho Transportation Department (ITD) for sharing the following information regarding the I-15/US-20 Connector Study. For more information about District 6, please click here ITD District 6.

For more information on the project, please go to: http://itd.idaho.gov/i15-us20/

ITD is collaborating with the City of Idaho Falls, Bonneville County and other stakeholders on this project development.

 

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Our Collaborators

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I-15 & US-20 Interchanges

Constructed in the 1950s and 60s, the I-15 and US-20 interchanges in Idaho Falls have outlived their usefulness. The outdated infrastructure is affecting safety, mobility and economic opportunity in the city, county, and region.

 

The connector study includes six interchanges:

  1. I-15: Exit 118 – Broadway St. to Historic Downtown

  2. I-15: Exit 119 – US-20, Grandview Dr.

  3. US-20: Exit 307 – Lindsay Blvd.

  4. US-20: Exit 308 – Riverside Dr. to City Center

  5. US-20: Exit 309 – Science Center Dr.

  6. US-20: Exit 310 – Lewisville HWY

 
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Four major goals for this study

  • Collect information about how the project might impact the area.

  • Make data from the environmental study accessible to all.

  • Determine short-, mid-, and long-term improvements as funding becomes available.

  • Develop a solid plan to provide safe and efficient travel for all users.

Exit 119

A closer look at the Exit 119 Interchange in Idaho Falls.

I-15 Northbound off-ramp at Exit 119:

  • Has the highest volume of traffic of any I-15 ramp in Idaho.

  • During peak traffic times, more than 8,700 vehicles turn right to access U.S. 20.

  • Ramp traffic backs up and interferes with through traffic on I-15 Northbound.

Attempts to Improve Safety

  • ITD gradually reduces the speed limit on US-20 East of Exit 119.

  • Speed limit reduction appears to lessen the severity of crashes, but not necessarily decreased the frequency of crashes.

Together, we will actively engage the public throughout the process to determine how to:

  • Improve the corridor

  • Better serve Idaho Falls