Construction Update – Week of Sep 3


In observance of the Labor Day holiday, there are no I-15 closures scheduled from 6 a.m. Friday, Aug. 31 through 4 p.m. Tuesday, Sept. 4.


Second Street in Norco will be reduced to one lane in each direction, intermittently, between 6:30 a.m. and 2:30 p.m., Tuesday, Sept. 4 through Friday, Sept. 7, for construction activity to widen the Second Street bridge. Both sides of the street will not have lane reductions simultaneously. Motorists should expect delays and use alternate routes, if possible.

Please note that additional lane closures on Second Street may be required throughout September; please watch for updates.


There will be no closures within the project area, from 6 a.m. Friday, Aug. 31 through 4 p.m. Tuesday, Sept. 4, due to the Labor Day holiday.

Alternating lane closures are scheduled at night on northbound and southbound I-15, for pavement demolition, sawcutting, grading, and setting k-rail. At least one lane will remain open at all times, unless otherwise noted.

In addition to nightly lane closures along I-15, the Third Street undercrossing at I-15 will be closed to all traffic overnight, between 9 p.m. and 6 a.m., Tuesday, Sept. 4 and Thursday, Sept. 6 and between 10 p.m. and 6 a.m. Friday, Sept. 7. Detour signage will be posted and motorists will be directed to use Second Street as an alternate.

The scheduled nighttime closures are:

Schedule Closure Location
Tuesday, Sept. 4

*9 p.m. to 5 a.m., unless
otherwise noted

  • Third Street Undercrossing Closed at I-15 (9 p.m. to 6 a.m.)
  • Southbound I-15 from SR-91 to Magnolia Avenue
  • Eastbound SR-91 to Southbound I-15 Connector
  • Westbound SR-91 to Southbound I-15 Connector
  • Southbound I-15 to Eastbound SR-91 Loop Connector
Wednesday, Sept. 5

9 p.m. to 5 a.m.

  • Southbound I-15 from Santa Ana River Bridge to Third Street
Thursday, Sept. 6

*closure times vary

  • Third Street Undercrossing Closed at I-15 (9 p.m. to 6 a.m.)
  • Northbound I-15 at Third St. (8 p.m. to 5 a.m.)
  • Southbound I-15 from Third Street to Hidden Valley Parkway
Friday, Sept. 7

*closure times vary

  • Third Street Undercrossing Closed at I-15 (10 p.m. to 6 a.m.)
  • Northbound I-15 from SR-91 to Second St. (10 p.m. to 6 a.m.)
  • Southbound I-15 at Third St. (9 p.m. to 5 a.m.)


Lanes on northbound and southbound I-15 near SR-91 have been shifted toward the center median, allowing crews to work safely along the outside shoulders of I-15. The total number of lanes, as well as lane widths, remains the same.

Motorists are reminded to be aware of the new conditions and follow the 55 mile per hour speed limit through the construction zone, from State Route 60 to Cajalco Road.



Did you catch our latest video on the 15 Express Lanes? The third edition in our video series highlights partnerships. It takes a lot of collaboration between agenices to make a project like the 15 Express Lanes a reality. Click below to watch the video.

Neighboring Project

I-15 / Limonite Avenue Interchange Improvement 

The County of Riverside has approved a contract to improve the Limonite Interchange at I-15. In the coming weeks, major construction activity and closures, are planned as part of this project. For more information, including closure updates, please visit the project website,

Cajalco Road / I-15 Interchange Improvement Project
Road work and closures may occur within the I-15 corridor as part of the City of Corona’s Cajalco Road / I-15 Interchange Improvement Project.  Click to view construction updates for this neighboring project or for more information, visit the project’s website at

If information is needed in another language, please contact RCTC at (951) 787-7141 for free translation services.

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