RIVERSIDE, Calif. – The Riverside County Transportation Commission (RCTC) is advising motorists traveling on southbound 71 in Chino and Chino Hills to stay alert for weeknight full closures of southbound 71. The full closures of southbound 71 at Butterfield Ranch Rd./Euclid Ave are scheduled Monday through Friday nights, September through October 4. The southbound 71 to eastbound and westbound 91 connectors will also be closed.

The closures will take place from 9 p.m. to 5 a.m., Monday through Thursday nights, and midnight to 6 a.m. on Friday nights. The closures are needed as part of RCTC’s 71/91 Interchange Project and will allow crews to safely begin building a new portion of support structures for the new eastbound 91 to northbound 71 connector. Additional nighttime lane reductions along eastbound and westbound 91 may also occur during these nightly closures.

To avoid lengthy traffic delays, motorists are highly advised to avoid the southbound 71 and use southbound 57 or southbound I-15 to reach the 91 and other destinations located to the south.

Motorists traveling on the southbound 71 will be rerouted to the Butterfield Ranch Rd./Euclid Ave off-ramp in Chino Hills. Traffic will be detoured northbound along Euclid Ave to either eastbound or westbound 60, where motorists can travel to either southbound I-15 or southbound 57.

Construction activity is subject to change due to weather or other factors. Fire, police, and ambulance services will have access for emergency response.

RCTC, in partnership with Caltrans, is reconstructing the 71/91 interchange in Corona. The project will replace the single-lane loop connector between the eastbound 91 and northbound 71 with a new, two-lane, direct connector ramp. The project is anticipated to be completed in 2025.

To register for construction updates, text 7191interchange to (855) 793-2625 or sign up through the project webpage, rctc.org/71-91interchange. For the latest closure information, visit rctc.org/7191Closures.