Frequently asked questions

The blasting that is planned as a part of this project will only occur in small applications. This means the potential impact on any surrounding properties outside the blasting zone will be limited. In addition, the contractor will have a specialized team onsite to ensure the blasting does not impact any surrounding structures.

There will be turnaround spots for drivers prior to the closure areas at the following locations:

South end of canyon:

• Northbound drivers can turn around at the roundabout just north of uptown Sedona.
• Southbound drivers can turn around near Purtymun Lane, just south of Sedona Views Bed and Breakfast.

North end of Canyon:

Emergency access through the canyon will be maintained at all times for first responders and other emergency crews. First responders will be able to travel through the work areas as needed for medical or other emergencies. Regarding wildfires, there will be an emergency evacuation plan in place for canyon residents and businesses.

Unfortunately, since SR 89A is so narrow there is no room to maintain one lane of traffic in each direction through the work zones during construction. Thus, it is not possible to safely construct the improvements without some limited full closures and single lane restrictions. We recognize any restrictions on SR 89A corridor are going to be inconvenient; however, we have done our best to keep the closures to a minimum and limit the overall impacts.

Due to the type of work involved and nature of the narrow corridor with steep slopes, having the contractor work at night or during the winter when there is the possibility of ice and snow is both hazardous and much more costly. The blasting work at the south end of the project cannot be completed at night, as this would impose unacceptable safety risks to construction crews and the public. There is also some work, such as paving, that must be done in certain temperatures. In the Oak Creek Canyon/Sedona area, we typically shut down work during the winter due to the weather conditions.

ADOT will notify the public seven calendar days in advance through roadside message boards and traffic alerts via email. The best way to stay informed is to sign up to receive traffic alerts, which will be emailed directly to your inbox. Visit the project web page at azdot.gov/SR89A to sign up.

Aside from the five daytime full closures at MP 375, which are allowed to occur from 6 a.m. to 4 p.m. Sundays through Thursdays, we do not anticipate any weekend or holiday closures. However, there will be 24/7 lane restrictions in place at the bridge and erosion control work zones while construction is underway on these two improvements. This will include temporary traffic signals. Closures are subject to change based on unforeseen circumstances, such as weather or traffic incidents.

The contractor is required to notify ADOT 20 business days in advance of all full closures. Once the closure and traffic-control plans are approved, ADOT will inform the public seven calendar days in advance through roadside message boards and email notification.

The detour routes are expected to add about an hour of travel time, depending on the point of origin and destination, without any other additional traffic delays. The one lane of travel through the north end of the canyon with temporary signals is expected to add approximately 45 minutes during weekday off-peak times and approximately one hour during peak travel periods. However, this corridor is subject to wide variations in traffic levels so there could be times when travel times are higher.

• Drivers traveling from Sedona to Flagstaff will use State Route 179 to Interstate 17.
• Drivers traveling from Flagstaff to Sedona will use I-17 to SR 179.
• Message boards and other social media will be used to notify the traveling public seven calendar
• days in advance of full closures.
• A signed detour will also be provided during the closures.

Up to five full daytime closures from 6 a.m. to 4 p.m. Sunday mornings through Thursday evenings at the south end (MP 375) and up to 10 overnight full closures from 9 p.m. to 6 a.m. Sunday nights through Friday mornings at the north end (MP 387-389) of the project. The closures may be on consecutive or non-consecutive days.

Access will be maintained to properties in Oak Creek Canyon throughout the project. During the limited full closures on SR 89A, it may take longer to get to and from properties in the canyon since a detour will be in place. During the closures, property access to and from SR 89A will be maintained with detours either to the north or the south via SR 179 and I-17.

Construction is expected to start early this spring and be completed by the end of 2023. SR 89A will remain open to traffic with the exception of limited daytime and overnight closures. Once construction starts, the highway will be narrowed to one lane only through the work zone(s) with alternating northand southbound travel. Traffic-control will be maintained using a combination of temporary traffic signals and/or a flagging operation. ADOT is committed to completing the improvements as quickly as possible, while balancing the transportation and access needs of local communities.

The nature of the SR 89A corridor and the type of work being performed required extensive coordination with area public and private agency partners to determine how best to construct these projects, while minimizing impacts to drivers and canyon residents and businesses.

We discussed the pros and cons of two construction approaches:

Completely closing the north end of Oak Creek Canyon, which would get the improvements completed sooner, but with more driver and local impacts.

OR

All three improvements are vital to preserve the integrity and safety of State Route 89A. The highway was built in a canyon with a lot of rock-cut faces, which erode over time due to weather conditions. This leads to large rocks, sediment and other debris on the roadway, which creates significant safety and maintenance issues. The improvements include: 

No, this freeway is not tolled and is funded by state, federal, and local dollars.

Ports of entry monitor all commercial traffic entering Arizona for registration, taxes, size and weight restrictions, commercial driver license requirements, insurance requirements and equipment safety requirements, and issue permits as required. ADOT’s Enforcement and Compliance Division further works to ensure the safe and efficient movement of commercial motor vehicles on highways throughout Arizona.

Arizona highways, like most highways across the United States, are open to all kinds of traffic, so long as the cargo being carried is in accordance with U.S. Department of Transportation regulations for the specific type of cargo. The Arizona Department of Transportation has a few locations in the state with hazardous cargo restrictions, but these restrictions are based on emergency response issues or roadway design limitations specific to that location.

The SMF was not constructed to create a "truck bypass" for downtown Phoenix. The freeway is part of a transportation system developed to improve mobility in the region by increasing capacity and providing traffic alternatives—including truck traffic—to other, already congested routes. As with all other freeways in the MAG region, trucks use the SMF for the through transport of freight, for transport to and from distribution centers, and for transport to support local commerce.

Factors considered in the environmental study were the amount of truck traffic that would use the freeway and its potential impact on the surrounding community. The MAG regional travel demand model forecasts approximately 10 percent truck traffic on the South Mountain Freeway in 2035. The forecasted truck traffic is based on existing traffic studies and projected socioeconomic data. This percentage is similar to current traffic conditions on I-10 between Loop 101 and I-17 and on US 60.