SR 57/60 Confluence Chokepoint Relief Project

Closure of SR-60 from Lemon Ave/Brea Canyon Rd to Diamond Bar Blvd Sat, March 28 (12 am - 6 am) WB SR -60-CLOSED Sun, March 29 (12 am - 8 am) EB & WB SR-60 -CLOSED Ramps also impacted. Please review notice below for more information.

Traffic Alert (Mar 23–29) Night closures on SR-60 (EB/WB lanes, ramps) Mar 23–26, 10PM–6AM. 
NB 57→EB 60 connector closed Mar 23 & 26.
 Grand Ave Bridge closed Mar 28–29 nights. 
Daytime: EB 60 Diamond Bar Blvd on-ramp closed 9AM–1PM (Mar 23–26). Plan ahead & expect delays!

🚧 WB SR-60 closed (Lemon Ave–Diamond Bar Blvd) this weekend. EB open w/ lane closures. Sat 12–6AM, Sun 12–8AM. Ramps & Grand Ave Bridge closed—expect delays. Plan ahead.

🚧 Overnight Closure Alert 🚧
WB SR-60 closed between Lemon Ave & Diamond Bar Blvd 
🗓 Mar 21 (12–6 AM) & Mar 22 (12–8 AM) EB SR-60 remains open (lane closures).
Expect delays, follow detours, and plan ahead!

Last week, our team joined the CMAA Owner’s Night to connect with partners and colleagues across the infrastructure community. Engaging in these events helps us strengthen the collaborations needed to deliver transformative projects for the region.

Happy #StPatricksDay! Wishing a happy and safe day to all our residents!☘️

March 16-22 Closures 🚧 Various connectors, streets, and lanes on SR-60 will be closed March 16–22 for the Project. Please review the closure notice for full details and plan ahead for possible delays. @DiamondBarCity @CaltransDist7

🚧 Traffic Alert: EB SR-60 closed from Diamond Bar Blvd to Lemon Ave for the 57/60 Confluence Project. 🗓 Sat, Mar 14: 12–6 AM
🗓 Sun, Mar 15: 12–8 AM Use alternate routes, allow extra time, and follow posted detours. Thanks for your @DiamondBarCity @CaltransDist7

Golden Springs Drive will be closed from Gatewy Center Drive to Adel Ave . March 12, 2026 🕖 9:00 PM – 5:00 AM Please use Diamond Bar Blvd and Pathfinder Road as detour route

Weekend Closures: SR-60 Closure Overnight closures for SR-60 between Lemon Ave and Diamond Bar Blvd. Mar 14–15: EB SR-60 closed
Mar 21–22: WB SR-60 closed
Mar 28–29: WB SR-60 closed 
12 AM – 8 AM (approx.) Expect ramp/connector and Grand Ave bridge closures.

The eastbound SR-60 will be closed between Diamond Bar Blvd and Lemon Ave this weekend for work on the SR-57/60 Confluence Project. 📅 (Mar 14) 12 am - 6 am (Mar 15) 12 am - 8 am ⚠️ Connectors/ ramps in the area will also be affected. Expect delays. @DiamondBarCity

NEWS: There will be a series of weekend closures starting March 14 impacting the on/off ramps and connectors for the SR-57/60 Diamond Bar region. Please plan ahead and use alternatre routes. For more details, visit sgvcog.org/pressreleases or @5760Project #DiamondBar

During #IrishAmericanHeritageMonth, we celebrate the rich culture of our Irish American neighbors and thank them for their contributions that continue to shape and strengthen communities across our nation.

We wish you all a very happy #Holi! May this day be filled with joy, fostering community, and lots of celebration.

🚧 Traffic Alert EB SR-60 Closure 🚧 EB State Route 60 closed between Lemon Ave & Diamond Bar Blvd: 
🗓 Mar 7: 12–6 AM
🗓 Mar 8: 12–8 AM Connector ramp and several on and off ramps will be affected. Expect delays. Follow detours. Plan ahead.

🚧 March 1 - WB SR-60 Overnight Closure Alert 🚧 WB SR-60 will be fully closed between Lemon Ave & Diamond Bar Blvd for work on the 57/60 Project on March 1st from 12 am to 8 am. Ramps and connectors will be affected. Plan ahead & expect delays!

🚧 Overnight Closure Notice – 57/60 Project 🚧 As part of the State Route 57/60 Confluence Chokepoint Relief Project, Prospectors Road will be closed tonight from 11 PM to 5 AM. 🔁 Please use Diamond Bar Blvd as your detour route.

🚧 March 1 - WB SR-60 Overnight Closure Alert 🚧 WB SR-60 will be fully closed between Lemon Ave & Diamond Bar Blvd for work on the 57/60 Project on March 1st from 12 am to 8 am. Ramps and connectors will be affected. Plan ahead & expect delays!

As part of the SR 57/60 Confluence Project, westbound SR-60 will undergo a full closure between Lemon Avenue and Diamond Bar Boulevard from Sunday, March 1 at 12:00 a.m. to 8:00 a.m. For more info: sgvcog.org/pressreleases

Ramadan Mubarak! 🌙 As the holy month begins, we wish our Muslim neighbors across the SGV a month filled with peace, reflection, and community. We are proud to serve such a beautifully diverse region.