Project Overview 

UDOT is designing improvements for I-15 through St. George to accommodate the area's long-term transportation and mobility needs. These improvements will widen I-15 to three lanes, replace multiple bridges, and construct new bridges to establish more local connections in St. George. 

This project is currently in the design phase and is expected to begin construction in Fall 2026 and last through Spring 2029. 

During the project crews will:  

1. Widen northbound and southbound I-15 from two lanes to three lanes between Bluff Street (Exit 6) and St. George Boulevard (Exit 8) 
2. The road will be widened to the inside to avoid substantial property impacts. 
3. Replace bridges and raise I-15 at 100 South and 700 South to accommodate the additional lanes and minimum clearance height. 
4. Construct new bridges over 400 East and 900 South to establish local street connections under I-15.   
5. Coordinate the realignment of several utilities and the installation of new utilities. 
6. Improve drainage along I-15 and local cross streets to reduce flooding.  
7. Construct two noise walls on the east side of I-15.  

Key Features Map:

To find information about the improvements happening on Bluff Street, visit their project website.