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Interstate 17

 

Routing

Interstate 17 is the main north-south freeway in Arizona, connecting Phoenix with Flagstaff. It is a heavily traveled, regional corridor that connects Interstate 10 with Interstate 40.

Within Phoenix, I-17 travels the Black Canyon Freeway, one of the older freeways in the city completed in the early 1960s1. It leaves the urban area and enters the central Arizona desert, with a former business loop (decommissioned in 2011) serving Rock Springs and Black Canyon City.

Interstate 17 turns northeast and begins its ascent onto the Mogollon Plateau after the split of Arizona 69 toward Prescott at Cordes Junction. This requires a significant elevation increase between the desert floor and the top of the plateau, and the views are rewarding. I-17 traverses Coconino National Forest for its remaining distance to Flagstaff, with a forest landscape that is significantly different from the desert below.

The freeway has two major connections to the famous Sedona area, via Arizona 260 near Camp Verde and Arizona 179 near Rimrock. I-17 continues through national forest land until meeting I-40, and the freeway ends at an early 2000s-rebuilt cloverstack interchange. Arizona 89A (Milton Road) stems north from the freeway end as a surface street into the city center of Flagstaff.

Parallel/Historical U.S. Routes

The northernmost reaches of Interstate 17 replaced U.S. 89 Alternate. The remainder of the route replaced Arizona 69, through to U.S. 89, which ran in tandem through Downtown Phoenix along side U.S. 60-70-80.

Planned Improvements

The Black Canyon Freeway, originally constructed in Phoenix between Jefferson Street and Northern Avenue with four lanes, was designed for 20,000 vehicles per day (vpd). As of 2003, the same highway carried up to 220,000 vpd amid six through lanes and two HOV lanes. The freeway is home to routine traffic back-ups.

Expansion options to mitigate traffic congestion along I-17 were included in the Maricopa Association of Government 20-year Regional Transportation Plan. Funds earmarked for Interstate 17 in the plan included one study to build an upper deck to the freeway. Inspiration for the I-17 plan was derived from the construction of a second deck for the Leroy Selmon Expressway (SR 618) in Tampa, Florida, in addition to the population density adjacent to the Black Canyon Freeway. This east-west tollway was expanded as part of a $350 million in construction between April 2004 and July 2006. Six miles of roadway were added for the use of reversiable traffic flow. These were supported with single pier-supports placed within the tollway median. Within Phoenix, the second deck of the Black Canyon Freeway was considered for the stretch between Interstate 10 (Exit 199) north and Dunlap Avenue (Exit 207), a distance of eight miles.

Similar to the Tampa roadway, the I-17 roadway would have carried Express lanes with only a few entry and exit points. Some early public comments on the project were positive. A west Phoenix community group, Community Leaders Organizing for Urban Transformation (CLOUT), however were not supporters. They contested that the highway would help divide west Phoenix from the rest of the city and advocated a relocation of funds toward mass transit-based projects. As of 2003, construction of the upper deck for Interstate 17 was unlikely until 2016 and 2020.1

No progress was made since and by 2011 a new I-17 Corridor Improvement Study was underway. This ADOT study was rescinded in 2012, along with the concurrent ADOT I-10 Corridor Improvement Study. Planning, engineering and environmental information derived from those studies were folded into a new I-10/I-17 Corridor Master Plan. Referred to as the "Spine", because of its role as the backbone of transportation mobility in the Phoenix area, the study pertains to 35 miles of I-10 and I-17 from Loop 202 to the south and Loop 101 to the north. The first round of public meetings on the Spine Study were conducted by the Maricopa Association of Governments in partnership with ADOT and the FHWA in March 2015.

Future Aspirations

According to the journal Roads and Bridges, Interstate 17 could be considered for an extension described as follows: "Interstate 17 -- Phoenix to Salt Lake City: Like Phoenix, Salt Lake City is one of the nation's fastest growing metropolitan areas with a population of 1.2 million. There is no direct Interstate connection between Phoenix and Salt Lake City. Completion of this corridor would require building or upgrading approximately 300 miles of roadway from Flagstaff, Arizona, to Sevier, Utah."

Interstate 17 is completed from Phoenix to Flagstaff, while Interstates 70 and 15 would complete the connection to Salt Lake City. The costs to construct this route, both economic and environmental, would be significant. Such an extension is merely speculative at this time.

History

Interstate 17 between Phoenix and Cordes Junction (Exit 262), replaced the southern extent of Arizona 69. This is significant because the exit numbering scheme still follows the original mileage of Arizona 69. According to the Misc.Transport.Road FAQ (Marc Fannin) and based on comments from Richard C. Moeur, a unique milepost system was utilized in Arizona until the mid-1980s. The system specified that any route that did not enter Arizona from another state used the mileage of the intersecting route's mileage at its south or west end as its starting value. The former route of Arizona 69 originated from U.S. 89 at milepost 201. Since I-17 & AZ 69 were overlapped originally, the exit numbers along the freeway used the mileposts of AZ 69. The exit numbers on Interstate 17 are not related to those of Interstate 19. 174 miles separates the respective south ends.

The Black Canyon Freeway was the first section of I-17 to be built, with construction opening segments from I-10 northward to Little Deer Valley between 1958 and 1965. The freeway was completed in 1978 when the road north from Exit 268 (Dugas Road) through Spring Gulch to Arizona 169 (Exit 269) opened to traffic. See the I-17 Arizona guide for the rest of the time line.

Highway Guides

Southern Terminus - Interstate 10 - Phoenix, Arizona
Perspective from Interstate 17 south
The final four exits along southbound Interstate 17 are: Exit 195B, 7th Street; Exit 195A, 16th Street; and Exits 194B-A, Junction Interstate 10. This is the first mention of the southeastern interchange with Interstate 10 on a guide sign. These exit numbers are based on the mileage of former Arizona 69, so they do not end at milepost zero in Phoenix. This causes some confusion, but most here understand that Mile 194 is the south end of Interstate 17. Photo taken 01/17/05.
These are the last reassurance shields along southbound Interstate 17 and eastbound U.S. 60 before meeting Interstate 10 southeast of downtown Phoenix. Photo taken 10/27/03.
Southbound Interstate 17 and eastbound U.S. 60 approaches Exit 195A, 16th Street (last exit southbound) followed by its second and final junction with Interstate 10 in one mile. Photo taken 01/17/05.
The final exit along southbound Interstate 17 and eastbound U.S. 60 is Exit 195A, 16th Street. The final offramp, which connects southbound Interstate 17 with northbound (westbound) Interstate 10 to Sky Harbor International Airport at Exit 194, approaches. Photo taken 01/17/05.
The connection from southbound Interstate 17 and eastbound U.S. 60 to westbound Interstate 10 and Sky Harbor International Airport is via Exit 194 in the right lanes. The left lanes default onto eastbound Interstate 10 and U.S. 60. Photo taken 01/17/05.
Interstate 17 ends at its second interchange with Interstate 10; although signed as southbound, Interstate 17 is headed due east at this point. Westbound Interstate 10 leads north to Sky Harbor International Airport and downtown Phoenix. Eastbound Interstate 10 and U.S. 60 lead south to Tempe and southeastern Phoenix, with connections to Mesa, Globe, and Apache Junction via U.S. 60 and Tucson via Interstate 10. Photo taken 01/17/05.
An END shield is posted for the southern terminus of Interstate 17 as southbound merges onto eastbound Interstate 10. (There use to be an END shield at the north end of Interstate 17, but it was taken down when the Flagstaff interchange with Interstate 40 was reconstructed.) This shield was the only remaining end sign or shield posted on any of the Arizona statewide Interstates. Photo taken 01/17/05.
Perspective from Interstate 17 north
The first northbound Interstate 17 reassurance shield and associated U.S. 60 overlap. The two routes coincide with one another through to Exit 201/Grand Avenue. There U.S. 60 travels surface streets for the first time in Phoenix en route to Glendale, Peoria, Surprise and ultimately Wickenburg and the southern terminus of U.S. 93. Else wise Interstate 17 will again interact with Interstate 10 in approximately five miles. Photo taken by Justin Cozart (10/02).
Perspective from Interstate 10 west
The first indication of the upcoming Interstate 17 southern terminus is this Exit 150A overhead, 1.50 miles to the east. Due to the tunnels of Interstate 10 north of Downtown, Hazardous Cargo is relegated to Interstate 17 on the southside of the central business district. Photo taken 05/24/03.
Westbound Interstate 10 expands to seven lanes in preparation for the split with Interstate 17 north/U.S. 60 west. Exit 150B comes into play with 24th Street before the Interstate 17 terminal. Photo taken 01/17/05.
Auxiliary overhead for Exit 150B reminding motorists to use Interstate 17 for U.S. 60 based traffic interests to the northwest. Incidentally, U.S. 60 is the last remaining US route within the Phoenix metropolitan area. Gone are U.S. 70, U.S. 80, U.S. 89, and Arizona 93 (was it to be future U.S. 93 at one time?). Since most of these routes all shared the same road (Van Buren Street), it was much easier to turn back most of these routes. Photo taken 05/24/03.
Interstate 17 begins and U.S. 60 bids Interstate 10 farewell in this eight lane freeway scene along westbound. Also to the right Exit 150B departs for 24th Street. The first Interstate 17 interchange serves 16th Street, a short distance beyond this partitioning. Photo taken 01/17/05.
Here is another view of the same sign bridge, taken a couple years prior. Note that although the signs here were installed just three years ago, the top of the Exit 150B panel is missing. Photo taken 05/26/03.
The previous incantation of Interstate 10/17 guide signs on the above Pictured sign bridge. Note that Interstate 10 was cosigned with an Arizona 51 trailblazer and given the second control point of Central Phoenix. Photo taken by Patrick Sadler (1994).
The last sign bridge of this interchange is here, with the left four lanes continuing northwest on Interstate 10 toward Sky Harbor International Airport and Arizona 51/Piestewa Freeway. The right three lanes transition onto northbound (westbound) Interstate 17 and U.S. 60. The next Interstate 10 interchange is with Buckeye Road, one half mile to the north. The control city of Los Angeles, California is an additional 419 miles to the west along Interstate 10. Photo taken 01/17/05.
Perspective from Interstate 10 east
This is the first indication along eastbound (southbound) Interstate 10, just prior to the airport exit east of downtown Phoenix. Photo taken 01/17/05.
The right lane exits to Exit 150, Junction Interstate 17 north and U.S. 60 west. Note that U.S. 60 is omitted to alleviate confusion with the Superstition Freeway interchange. Photo taken 01/17/05.
Eastbound Interstate 10 approaches Exit 150, Junction Interstate 17 north. Interstate 10 and Interstate 17 form an inner belt surrounding downtown Phoenix. Photo taken 01/17/05.
A quarter mile further south, eastbound Interstate 10 reaches Exit 150, Junction Interstate 17 north. This interchange marks the southern end of Interstate 17. Photo taken 01/17/05.
Northern Terminus - Interstate 40 - Flagstaff, Arizona
Perspective from Interstate 17/Arizona 89A north
Interstate 17 northbound, two miles south of Exit 340A/B - Interstate 40. This is one of five Flagstaff area interchanges: Exit 333/Kachina Boulevard, Exit 337/Flagstaff Airport, Exit 339/Lake Mary Road, Exit 340/Interstate 40 and Exit 341/McConnell Drive. Photo taken 05/24/03.
With the San Francisco Mountains on the horizon, Interstate 17 draws to within one mile of the terminal interchange with Interstate 40. This sign retains button copy lettering. Photo taken 05/24/03.
Interstate 17 northbound expands to three lanes with the approach to Exit 339/Lake Mary Road to Mormon Lake. The stack interchange with Interstate 40 is 0.75 miles to the north. Photo taken 05/24/03.
Exit 339 departs as Interstate 17 nears Interstate 40. The interchange and northernmost reaches of Interstate 17 were recently reconstructed to expand capacity and allow for higher speed ramps between I-17 and Interstate 40. Photo taken 05/24/03.
Exit 340A leaves Interstate 17 northbound for Interstate 40 east. While the control city is Albuquerque, Interstate 40 also serves the Arizona towns of Winslow at Exit 252, Holbrook at Exit 285, and Chambers at Exit 333. Photo taken 05/24/03.
Results of the aforementioned construction project culminate with this high flyover from Interstate 40 west to Interstate 17 south. A cloverleaf ramp facilitates the traffic movements to Interstate 40 westbound from Interstate 17 north via Exit 340B. Interstate 40 travels 30 miles to Williams, 147 miles to Kingman, and 177 miles to Bullhead City via a connection with U.S. 93 and Arizona 68. Photo taken 05/24/03.
Situated just north of the Interstate 40 stack interchange, Exit 341 serves McConnell Drive and the city of Flagstaff. Arizona 89A continues north into downtown Flagstaff, where it terminates at Business Loop I-40 and U.S. 89. Photo taken 05/24/03.
Although Interstate 17 is not shown as continuing north along Arizona 89A via Interstate 40 signage, the next exit north of Interstate 40 (the last exit overall) carries the numbering convention of Interstate 17. Downtown Flagstaff is ahead. The mountain city is home to 52,894 Arizonans. Photo taken by Justin Cozart (10/02).
The northern terminus of Arizona 89A at Business Loop 40 (original U.S. 66) and the southern terminus of U.S. 89. U.S. 180 is located nearby. The stem of U.S. 80 represents the main highway into the Grand Canyon National Park area. Page is the control point of U.S. 89. This town is located far to the north near Glen Canyon Dam and the Utah state line. Photo taken 05/24/03.
Perspective from Arizona 89A south
Eastbound on Forest Meadows Street at Milton Road. Arizona 89A continues northward from the northern terminus into Flagstaff, where it meets Business Interstate 40 and U.S. 80. Interstate 17 is located to the right of this intersection. Photo taken by Jim Mullady (01/01).
Business Loop I-40/Historic U.S. 66 eastbound at the northern terminus of Arizona 89A. Arizona 89A begins the freeway spur that becomes Interstate 17 southbound to the right. To the left, Business Loop I-40 unites with the northbound beginning of U.S. 89 along Milton Road. Photo taken 05/24/03.
Nearing Exit 340B/A on Interstate 17/Arizona 89A southbound for Interstate 40. This interchange was recently under construction, with the addition of a new flyover between Interstate 40 west to Interstate 17 south. The City of Angels is approximately 462 miles to the west of Exit 340B. Photo taken by Justin Cozart (10/02).
The scene in the above photograph, during interchange reconstruction. The button copy panels in this photograph were replaced upon completion of the project with those in the above photograph. The Arizona control points of Williams and Winslow were eliminated from the sign convention. Photo taken by Jonathan Osborne (7/99).
Snow adorns the hillside in this perspective of the southbound Interstate 17 beginning at the Interstate 40 interchange. Photo taken by Jim Mullady (1/01).
Southbound Interstate 17/Arizona 89A at the cloverleaf off-ramp for Interstate 40 east/Exit 340A. Not as far as the westbound control city for Interstate 40, Albuquerque is still a fair distance away at 323 miles. The irony in this is that in Albuquerque the westbound control city of Interstate 40 is the 20,000 populous city of Gallup, not Flagstaff. Photo taken by Justin Cozart (10/02).
Perspective from Interstate 40 west
Interstate 17/Arizona 89A junction sign, five miles east of the northern terminus near Exit 201/U.S. 180 east. U.S. 180 overlaps with Interstate 40 from Holbrook at Exit 285 westward to Exit 201 at Flagstaff. Photo taken 05/24/03.
Two mile guide sign on Interstate 40 westbound for Interstate 17/Arizona 89A/Exit 195. Somewhat typical in many two mile advance signs on the Interstate system for Interstate junctions, no control cities are placed. Photo taken by Justin Cozart (10/02).
This near dusk photograph of the same sign reveals the reflectivity of the button copy lettering due to the camera flash. This is the last Interstate junction along westbound Interstate 40 until the highway terminates at Interstate 15 at Barstow, California, 352 miles to the west. Photo taken 05/24/03.
Nearing Exit 195/Interstate 17/Arizona 89A on Interstate 40 westbound, downtown Phoenix is 140 miles to the south. Sedona (via Arizona 89A south) is nestled 32 miles to the southwest. Photo taken by Justin Cozart (10/02).
Another dusk view of Interstate 40 westbound as it nears Interstate 17. Interstate 40 sees an additional two Flagstaff area interchanges after Interstate 17: Exit 192/Dairy Road and Exit 191/Business Loop I-40/West Flagstaff. Photo taken 05/24/03.
Interstate 40 splits with Exit 195 traffic for Interstate 17/Arizona 89A in this scene. A new flyover is in place for movements between Interstate 40 west to Interstate 17 south. Therefore all traffic now departs here instead of partitioning between here and a cloverleaf ahead. Photo taken by Justin Cozart (10/02).
A revisit to the Interstate 40/Exit 195 lane expansion. Arizona 89A reunites with its state route parent Arizona 89 near the town of Prescott 91 miles to the southwest. Arizona 89 emerges along original U.S. 89 at Interstate 40 Exit 146/Ash Fork. Photo taken 05/24/03.
Nearing the gore point for Exit 195 on Interstate 40 westbound. Interstate 17 lowers from an elevation of 6,910 feet here at Flagstaff to 1,090 feet at the capital city of Phoenix. Photo taken 05/24/03.
Continuing along the exit 195 off-ramp, drivers partition into the movements for Interstate 17 & Arizona 89A south to Phoenix and Arizona 89A (Milton Road) north to Northern Arizona University and the city of Flagstaff. Photos taken by Justin Cozart (10/02).
The original configuration of the southbound beginning of Interstate 17 from Interstate 40 west consisted of a cloverleaf ramp. This photograph shows the Interstate 17 southbound beginning and associated signage (including the still designated U.S. 89) at that original ramp. Photo taken by Michael Summa (1988).
Perspective from Interstate 40 east
Interstate 40 eastbound at the terminus of Interstate 17. U.S. 89A, which has since been downgraded to Arizona 89A, overlaps with Interstate 17 from Flagstaff southward. Photo taken by Bill Manning (08/78).

Sources:

  1. "Double deck urged for I-17 in Phoenix." The Arizona Republic, September 16, 2003.
  2. "$15.7 billion transit plan endorsed." The Arizona Republic, September 18, 2003.

Page Updated July 6, 2015.

 
Mileage

State Arizona
Mileage 145.76
Cities Phoenix, Flagstaff
Junctions Interstate 10, Interstate 10, Interstate 40
Source: December 31, 2014 Interstate Route Log and Finders List
Interstate 17 Annual Average Daily Traffic

State Location AADT Composite Year
Arizona Phoenix 222,324 2001
Arizona North Phoenix 14,099 2001
Arizona Flagstaff 38,019 2001
Source: 2001 Arizona Interstate Annual Average Daily Traffic (AZDOT)
Complete Interstate 17 AADT data.
1964-65 Arizona Official Highway Map
Portions of Interstate 17 were open to traffic by 1964, including the Black Canyon Freeway in Phoenix and upgraded sections of Arizona 69 around Black Canyon and Cordes Junction. A super-two section of Arizona 79 bypassed Sedona. It was four-laned by 1976.
This 1965 Phoenix inset shows the east-west leg of I-17 as part of I-10. The proposed alignment of I-10 parallel to Buckeye Road shifted northward in 1964. This section would not be completed until 1990.
The Black Canyon Freeway opened first in 1958 at Grand Avenue (U.S. 60) and Thomas Road. Subsequent sections opened in 1960 north to Glendale Avenue (Exit 205) and 1961 from Exit 205 to Dunlap Avenue (Exit 207).
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