PHOENIX – Northbound Interstate 17 is scheduled to be closed near Happy Valley Road in north Phoenix this weekend, Feb. 21-24, for pavement and bridge improvements, according to the Arizona Department of Transportation.

Drivers should allow extra travel time and consider adjusting travel schedules while the following closure is in place:

• Northbound I-17 closed between Happy Valley Road and Loop 303 from 10 p.m. Friday, Feb. 21, to 5 a.m. Monday, Feb. 24. Northbound I-17 on-ramps at Deer Valley, Pinnacle Peak, Happy Valley and Jomax roads will be closed. Primary Detour: Northbound I-17 traffic will detour on westbound Happy Valley Road to northbound Lake Pleasant Parkway and eastbound Loop 303. Note: To limit delays for you and others, use the primary detour even if a navigation app suggests another route. Avoid using streets east of I-17 that are not designed to handle freeway traffic. Some street closures will be in place (local traffic only). Also Consider: Traffic is usually lighter during early morning or later at night.

The much-needed project to improve the pavement along I-17 between Happy Valley Road and State Route 74 has removed the old, worn top layer of asphalt pavement, and the concrete pavement beneath it has undergone a treatment known as diamond grinding. The current schedule calls for one additional weekend closure:

• Southbound I-17 closed between SR 74/Carefree Highway and Loop 303 from 10 p.m. Friday, Feb. 28, to 5 a.m. Monday, March 3.

The closure schedule is subject to change due to inclement weather or other factors. The improvement work already has created a safer, smoother and longer lasting surface along 6 miles of I-17 north of Happy Valley Road. Work on the project started in May 2024. To learn more and to subscribe for updates, please visit the project website at azdot.gov/i-17HappyValleySR74.

Real-time highway conditions are available on ADOT’s Arizona Traveler Information site at az511.gov, the AZ511 app (download for Apple or Android devices) or by calling 511.