U.S. Route 66 in Arizona

Last updated

US 66.svg

U.S. Route 66
Will Rogers Highway
U.S. Route 66 (AZ).svg
Route information
Maintained by ADOT (I-40 Bus., SR 66); county and local gov'ts
Length401 mi (645 km)
ExistedNovember 11, 1926 (1926-11-11)–June 26, 1985 (1985-06-26) [1]
US 66 (AZ historic).svgMUTCD D6-4.svg Historic Route 66
Major junctions
West endUS 66 (CA).svg US 66 at California state line
East endUS 66.svg US 66 at New Mexico state line
Counties Mohave, Yavapai, Coconino, Navajo, Apache
Highway system
Arizona 65 1963.svg SR 65 SR 66 Arizona 66.svg

U.S. Route 66 (US 66, Route 66) covered 401 miles (645 km) as part of a former United States Numbered Highway in the state of Arizona. The highway ran from west to east, starting in Needles, California, through Kingman and Seligman to the New Mexico state line as part of the historic US 66 from Santa Monica, California, to Chicago, Illinois. The highway was decommissioned in 1985, although portions remain as State Route 66 (SR 66).

Arizona state of the United States of America

Arizona is a state in the southwestern region of the United States. It is also part of the Western and the Mountain states. It is the sixth largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona shares the Four Corners region with Utah, Colorado, and New Mexico; its other neighboring states are Nevada and California to the west and the Mexican states of Sonora and Baja California to the south and southwest.

Needles, California City in California in the United States

Needles is a city in eastern San Bernardino County, California, United States. It lies on the western banks of the Colorado River in the Mohave Valley subregion of the Mojave Desert, near the borders of Arizona and Nevada and roughly 110 miles (180 km) from the Las Vegas Strip. It is the easternmost city of the San Bernardino-Riverside metropolitan area. Needles is geographically isolated from other cities in the county. Barstow, the nearest city within the county, is separated from Needles by over 140 miles of desert and 2 mountain ranges. The city is accessible via Interstate 40 and U.S. Route 95. The population was 4,844 at the 2010 census, up from 4,830 at the 2000 census.

California State of the United States of America

California is a state in the Pacific Region of the United States. With 39.6 million residents, California is the most populous U.S. state and the third-largest by area. The state capital is Sacramento. The Greater Los Angeles Area and the San Francisco Bay Area are the nation's second- and fifth-most populous urban regions, with 18.7 million and 9.7 million residents respectively. Los Angeles is California's most populous city, and the country's second-most populous, after New York City. California also has the nation's most populous county, Los Angeles County, and its largest county by area, San Bernardino County. The City and County of San Francisco is both the country's second-most densely populated major city after New York City and the fifth-most densely populated county, behind only four of the five New York City boroughs.



In 1914 the road was designated National Old Trails Highway; in 1926 it was re-designated US 66 with the birth of the U.S. Numbered Highway System. [2] Throughout the history of US 66 in Arizona, the road largely followed this original path with a notable exception.

The section between Topock where US 66 entered Arizona from California via the Red Rock Bridge and Kingman originally followed a steep and winding path past Oatman into the Black Mountains and through Sitgreaves Pass. This section was built across this rough terrain instead of following the more level route to the east adopted by the railroad because the road followed the National Old Trails highway which was for gold mining in Oatman and Goldroad, now a ghost town. It was fraught with hairpin turns and was the steepest along the entire route, so much so that some early travelers, too frightened at the prospect of driving such a potentially dangerous road, hired locals to navigate the winding grade. The section remained as Route 66 until 1952 when it was realigned, bypassing Oatman and running along level ground close to the railroad, from Topock to Kingman through Yucca. The original section of US 66 through Oatman is still open to traffic today as the Oatman Highway and has been designated the Route 66 Historic Back Country Byway by the Bureau of Land Management. [3]

Topock, Arizona unincorporated community in Arizona, United States

Topock ( ) is a small unincorporated community in Mohave County, Arizona. Topock has a ZIP Code of 86436; in 2000, the population of the 86436 ZCTA was 1,790.

Red Rock Bridge bridge in United States of America

The Red Rock Bridge was a bridge across the Colorado River at Topock, Arizona that carried the Atlantic & Pacific Railroad. It was built in 1890, replacing a wooden bridge dating to 1883 that was repeatedly washed out during spring flooding. It was used by the railroad until 1945 when a new bridge was built. The Red Rock Bridge was then converted to carry the automobile traffic of U.S. Route 66, and did so from 1947 until 1966 when Route 66 traffic was directed onto the Interstate 40 bridge. At that time the Red Rock Bridge was abandoned, and it was eventually dismantled in 1976.

Kingman, Arizona City in Arizona, United States

Kingman is a city in and the county seat of Mohave County, Arizona, United States. According to the 2010 census, the population of the city is 28,068. The nearby communities of Butler, and Golden Valley bring the Kingman area total population to over 45,000. Kingman is located about 105 miles (169 km) southeast of Las Vegas, Nevada and about 165 miles (266 km) northwest of the state capital, Phoenix.

In 1979, nearly all of US 66 was approved for decommissioning in Arizona; the highway's western (sic) terminus would now be in Sanders, Arizona, less than 40 miles (60 km) west of the New Mexico state line. [4] On October 13, 1984, Williams, Arizona, was the last point on the former US 66 in the state to be bypassed by an Interstate highway with the completion of Interstate 40 (I-40) there. Later that month, the Arizona Department of Transportation approved a plan to deal with the remains of the highway in Arizona. Parts were absorbed into I-40, turned over to the state in the form of a newly-minted State Route 66, or turned over to Yavapai County. [5] On June 26, 1985, all of US 66, including the small segment remaining in Arizona, was dropped from the U.S. Highway System. [1]

Sanders, Arizona Census-designated place in Arizona, United States

Sanders is an unincorporated community and census-designated place (CDP) in Apache County, Arizona, United States. Sanders is located at the junction of U.S. Route 191 and Interstate 40. As of the 2010 census, it had a population of 630.

Williams, Arizona City in Arizona, United States

Williams is a city in Coconino County, Arizona, west of Flagstaff. Its population was 3,158 in 2017, according to the U.S. Census Bureau. It lies on the route of Historic Route 66, Interstate 40, and the Southwest Chief Amtrak train route. It is also the southern terminus of the Grand Canyon Railway, which takes visitors to Grand Canyon Village. There are numerous inns, motels, restaurants and gas stations that cater to the large influx of tourists rather than local residents, especially during the summer and holiday seasons.

Interstate 40 (I-40) is an east–west Interstate Highway that has a 359.11-mile (577.93 km) section in the U.S. state of Arizona, connecting sections in California and New Mexico. The section throughout Arizona is also known as the Purple Heart Trail. It enters Arizona from the west at a crossing of the Colorado River southwest of Kingman. It travels eastward across the northern portion of the state connecting the cities of Kingman, Ash Fork, Williams, Flagstaff, Winslow, and Holbrook. I-40 continues into New Mexico, heading to Albuquerque. The highway has major junctions with U.S. Route 93 — the main highway connecting Phoenix and Las Vegas, Nevada — in Kingman and again approximately 22 miles (35 km) to the east, and Interstate 17 — the freeway linking Phoenix to northern Arizona — in Flagstaff.

The ADOT Parkways, Historic and Scenic Roads program recognizes certain sections of former US 66 as Historic Route 66. The longest sections of the designated historic route follow the original US 66 between Topock and Seligman through Oatman and from Flagstaff to Winona. Other smaller sections of Historic Route 66 comprise former US 66 segments that are currently or were once designated as I-40 Business. This is the case in Ash Fork, Williams, Winslow and Holbrook. Flagstaff is the only city in Arizona where the Historic Route splits into two alignments, the first being the aforementioned route to Winona and the second taking a small section of later US 66 to a junction with I-40 immediately east of Flagstaff. The discontinuous sections of Historic Route 66 are all connected by I-40. [6] [7] Historic Route 66 was the only route in the Parkways, Historic and Scenic Roads program to cross the state and the longest state-designated historic route in Arizona until the addition of Historic U.S. Route 80 in 2018. [8] [6] [7] Historic Route 66 is also one of only four state designated Historic Routes, with the others being Historic US 80, the Jerome-Clarkdale-Cottonwood Historic Road (Historic US 89A) and the Apache Trail Historic Road. [8] [6]

Flagstaff, Arizona City in Arizona, United States

Flagstaff is a city in and the county seat of Coconino County in northern Arizona, in the southwestern United States. In 2015, the city's estimated population was 70,320. Flagstaff's combined metropolitan area has an estimated population of 139,097. The city is named after a ponderosa pine flagpole made by a scouting party from Boston to celebrate the United States Centennial on July 4, 1876.

Winona, Arizona Populated place in Arizona, United States

Winona is a small populated place in Coconino County in the northern part of the U.S. state of Arizona. At one time it was also called Walnut.

Interstate business routes are roads connecting a central or commercial district of a city or town with an Interstate bypass. These roads typically follow along local streets often along a former U.S. route or state highway that had been replaced by an Interstate. Interstate business route reassurance markers are signed as either loops or spurs using a green shield shaped and numbered like the shield of the parent Interstate highway.

Route description

California border to Kingman

Route 66 between Oatman and Kingman Rte66btwnOatmanAndKingman.JPG
Route 66 between Oatman and Kingman

Route 66 entered Arizona from Needles, California across the Topock Gorge, within the Havasu National Wildlife Refuge,

Topock Gorge is a mountainous canyon and gorge section of the Colorado River located between Interstate 40 and Lake Havasu. The town of Needles, California, to the northwest, was named for the "needle-like" vertical rock outcroppings. The natural landmarks and river crossing by them were one of the journey markers for travelers on historic Route 66.

Havasu National Wildlife Refuge National Wildlife Refuge in California and Arizona in the United States

Havasu National Wildlife Refuge is a U.S. National Wildlife Refuge on the lower Colorado River in Arizona and California. It preserves habitat for desert bighorn sheep to the endangered southwestern willow flycatcher, birds and other animals. The refuge protects 30 river miles - 300 miles (480 km) of shoreline - from Needles, California, to Lake Havasu City, Arizona. One of the last remaining natural stretches of the lower Colorado River flows through the 20-mile-long (32 km) Topock Gorge.

Between the California state line and Kingman, the original alignment is now known as Oatman Road and passed through the old mining town of Oatman, now a tourist town. A later alignment (via Yucca) is now I-40. The older alignment passes through the Black Mountains complete with numerous hairpin turns. This area is desert.

Kingman to Seligman

Burros roam downtown Oatman Oatman burros.jpg
Burros roam downtown Oatman

SR 66 is the only part of old US 66 in Arizona to have state route markers. It still serves communities that the freeway avoids, including Valentine, Hackberry and Peach Springs; it enters the Hualapai Indian Reservation. Its western terminus is near Kingman at exit 52 on I-40 and its eastern terminus was originally near Seligman at exit 123 on I-40. The state highway designation currently covers just 66 miles (106 km) of a section east of Kingman. The road continues east into Yavapai County as a county-maintained road as the state turned over the easternmost 16.8 miles (27.0 km) of SR 66 (known as Crookton Rd) to Yavapai County in 1990 for maintenance. [9]

Between Kingman and Seligman, I-40's more southerly and more direct path diverges from US 66 by approximately 16 miles (26 km), cutting off businesses on this section from highway traffic on the freeway's completion. Hackberry almost became a ghost town; at one point artist Bob Waldmire (owner of the Hackberry General Store from 1992-1998) was a resident. Members of the Grigg family have lived in Hackberry since the 1890s. Hackberry cemetery has seven generations of Grigg family members buried there.

The Grand Canyon Caverns, just east of Peach Springs, are among the largest of dry caverns in the United States.

Seligman is the birthplace of the first route 66 association, established by local barber Angel Delgadillo in 1987. This group obtained the first "Historic Route 66" designation, which the state initially placed on the segment of US 66 between Kingman and Seligman.

Seligman to New Mexico border

Canyon Diablo Bridge enabled Route 66 to cross Canyon Diablo near Two Guns. Now a ghost town, Two Guns prospered as a tourist stop for Route 66 travelers. Canyon Diablo Bridge - Two Guns, Arizona.jpg
Canyon Diablo Bridge enabled Route 66 to cross Canyon Diablo near Two Guns. Now a ghost town, Two Guns prospered as a tourist stop for Route 66 travelers.

From Seligman to east of Flagstaff, the area is mountainous (not desert) and covered with pine forests. The old section through Flagstaff itself is officially named "Route 66". Shortly before joining I-40 east of Flagstaff, US 66 passes through Winona, a small unincorporated community made famous in the song "(Get Your Kicks on) Route 66".

Several abandoned portions of the former US 66 highway are listed on the National Register of Historic Places. These include Abandoned Route 66, Ash Fork Hill, Abandoned Route 66, Parks (1921) east of Parks, Arizona and Abandoned Route 66, Parks (1921) west of Parks, Arizona.

Williams Historic Business District and Urban Route 66, Williams were added to the National Register of Historic Places in 1984 and 1989, respectively.

The Meteor Crater is south of old US 66 near Winslow. The Homolovi State Park near Winslow preserves over 300 Ancestral Puebloan archaeological sites. At Joseph City is the Jack Rabbit Trading Post, which once posted signs up and down the highway for hundreds of miles, and at Holbrook is the Wigwam Village Motel, a motor court built to resemble a group of teepees. The Petrified Forest National Park is located east of Holbrook. About sixty miles before reaching New Mexico, the highway originally passed through the Painted Desert, though this section is now cut off.

Portions of US 66 were paved over by I-40 construction or converted to frontage roads.

US 66 shield from 1926 US 66 Arizona 1926.svg
US 66 shield from 1926
US 66 Arizona 1956 West.svg US 66 Arizona 1956 East.svg
Directional colored shields found on US 66 in Arizona during the 1950s.
Official ADOT Historic US 66 shield. US 66 (AZ historic).svg
Official ADOT Historic US 66 shield.

Major intersections

This list follows the final non-freeway alignment.

Mohave Topock 00.0US 66 (CA).svg US 66 west Los Angeles California state line
Arizona 95 1963.svg SR 95 north Oatman, Bullhead City west end of SR 95 overlap
0.40.64Arizona 95 1963.svg SR 95 south Lake Havasu City, Parker east end of SR 95 overlap
McConnico 48.578.1Oatman Highway - Oatman
Kingman 53.586.1US 93 1963 (AZ).svgUS 466 1963 (AZ).svgArizona 68 1963.svg US 93 north / US 466 west to SR 68 west Las Vegas, Bullhead City west end of US 93 overlap
57.492.4US 93 1963 (AZ).svg US 93 south (Louise Avenue) Wickenburg, Phoenix east end of US 93 overlap
Yavapai Ash Fork 166.1267.3US 89 1963 (AZ).svg US 89 south Prescott west end of US 89 overlap; now SR 89
Coconino Williams 185.1297.9Arizona 64 1963.svg SR 64 north Grand Canyon
Flagstaff 216.2347.9US 89A 1963 (AZ).svg US 89A south (Milton Road) Sedona, Phoenix Formerly SR 79
216.8348.9US 180 1963 (AZ).svg US 180 west (Humphreys Street) Grand Canyon west end of US 180 overlap
220.9355.5US 89 1963 (AZ).svg US 89 north Page east end of US 89 overlap
Arizona 166 1963.svg SR 166 south Walnut Canyon National Monument
Winona Townsend-Winona Roadpre-1947 US 66 west
Leupp Corner Arizona 99 1963.svg SR 99 north Sunrise, Leupp west end of SR 99 overlap
Navajo Winslow Arizona 87 1963.svgArizona 99 1963.svg SR 87 south / SR 99 south (Williamson Avenue) Payson east end of SR 99 overlap; west end of SR 87 overlap
Arizona 87 1963.svg SR 87 north Second Mesa east end of SR 87 overlap
Holbrook US 180 1963 (AZ).svgArizona 77 1963.svg US 180 east / SR 77 south (Navajo Boulevard) Show Low, St. Johns, Petrified Forest National Park east end of US 180 overlap; west end of SR 77 overlap
Arizona 77 1963.svg SR 77 north Keams Canyon east end of SR 77 overlap
Apache Petrified Forest National Park former SR 63 south
Chambers Arizona 63 1963.svg SR 63 north Ganado now US 191 north
Sanders US 666 1963 (AZ).svg US 666 south St. Johns west end of US 666 overlap; now US 191 south
US 66 (1961).svg US 66 east Albuquerque New Mexico state line
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Standin' on the Corner in Winslow Standin on the cornerpark.jpg
Standin' on the Corner in Winslow

A Desert Power & Water Co., Electric Power Plant built in 1908 closed in 1938, soon after the Hoover Dam was completed; it now houses a visitor information office, Route 66 Museum and gift shop.

The Schoolhouse at Truxton Canyon Training School in Valentine operated from 1903-1937 as a mandatory boarding school in which Hualapai were separated from their families and put to work learning various trades. [10] Long a symbol of forced assimilation, the historic building is now the property of the Hualapai Nation.

The Peach Springs Trading Post, constructed in 1928 using local stone and logs, replaced an earlier 1917 trading post at Peach Springs. Its original role was to trade native crafts for foodstuffs, medicine and household goods. [11] The building now houses Hualapai conservation offices.

Lowell Observatory, an astronomical observatory established in Flagstaff in 1894, is one of the oldest observatories in the United States and a designated National Historic Landmark. The observatory is well known for being the location where astronomer Clyde Tombaugh discovered the dwarf planet Pluto on February 18, 1930. [12]

Flagstaff's Santa Fe Railroad Depot, built in 1926, is the busiest of the eight Arizona Amtrak stations and includes a visitor information office. Flagstaff's 43-room Hotel Monte Vista was established in 1927.

Historic districts


Delgadillo's Snow Cap Drive-In in Seligman, built in 1953 with scrap railway lumber by Juan Delgadillo (1916–2004), continues to offer choices such as a "cheeseburger with cheese" and "dead chicken."

Camps, motor courts, and motels

Trails Arch Bridge in Topock Trails Arch Bridge.jpg
Trails Arch Bridge in Topock

The Oatman Hotel, a historic two-story adobe building which opened in 1902 as the Durlin Hotel and was rebuilt in 1924 during a local gold rush, now houses a bar, restaurant and museum. [17]

The Wigwam Village Motel in Holbrook is distinctive for patented novelty architecture in which every room of the motel is a free-standing concrete wigwam. [18] In Pixar's 2006 animated film Cars , these are depicted as the traffic cones of the Cozy Cone Motel.

The Pueblo Revival style Painted Desert Inn in Navajo, constructed circa-1920 of wood and native stone and purchased by the US National Park Service in 1935, is situated on a mesa overlooking the vast Painted Desert. [19]


See also

Related Research Articles

U.S. Route 66 Former US Highway between Chicago and Los Angeles

U.S. Route 66 or U.S. Highway 66, also known as the Will Rogers Highway, the Main Street of America or the Mother Road, was one of the original highways in the U.S. Highway System. US 66 was established on November 11, 1926, with road signs erected the following year. The highway, which became one of the most famous roads in the United States, originally ran from Chicago, Illinois, through Missouri, Kansas, Oklahoma, Texas, New Mexico, and Arizona before ending in Santa Monica in Los Angeles County, California, covering a total of 2,448 miles (3,940 km). It was recognized in popular culture by both the hit song "(Get Your Kicks on) Route 66" and the Route 66 television series, which aired on CBS from 1960 to 1964. In John Steinbeck's classic American novel, The Grapes of Wrath (1939), the road, "Highway 66", was turned into a powerful symbol of escape and loss.

Coconino County, Arizona County in the United States

Coconino County is a county located in the north central part of the U.S. state of Arizona. The population was 134,421 at the 2010 census. The county seat is Flagstaff. The county takes its name from Cohonino, a name applied to the Havasupai. It is the second-largest county by area in the contiguous United States, behind San Bernardino County, California, with its 18,661 square miles (48,300 km2), or 16.4% of Arizona's total area, making it larger than each of the nine smallest states.

Mohave County, Arizona County in the United States

Mohave County is in the northwestern corner of the U.S. state of Arizona. As of the 2010 census, its population was 200,186. The county seat is Kingman, and the largest city is Lake Havasu City.

Peach Springs, Arizona CDP in Arizona, United States

Peach Springs is a census-designated place (CDP) in Mohave County, Arizona, United States. The population was 1,090 at the 2010 census. Peach Springs serves as the administrative headquarters of the Hualapai people, and is located on the Hualapai Reservation.

Seligman, Arizona CDP in Arizona, United States

Seligman is a census-designated place (CDP) on the northern border of Yavapai County, in northwestern Arizona, the United States. The population was 456 at the 2000 census.

U.S. Route 180 highway in the United States

U.S. Route 180 is an east–west United States highway. Like many three-digit routes, US 180 no longer meets its "parent", US 80. US 80 was decommissioned west of Mesquite, Texas, and was replaced in Texas by Interstate 20 and Interstate 10 resulting in U.S. 180 being longer than U.S. 80. The highway's eastern terminus is in Hudson Oaks, Texas, at an intersection with Interstate 20. Its western terminus is unclear. Signage at an intersection with State Route 64 in Valle, Arizona 40 miles (64 km) northwest of Flagstaff indicates that the route ends at SR 64, which is consistent with the AASHTO U.S. Highway logs. However, many maps continue the US 180 designation to the south rim of the Grand Canyon at Grand Canyon Village. Signage at the SR 64 intersection as late as 2011 indicated that US 180 continues north concurrent with the route. However, no signage along the route exists past this intersection until SR 64 turns east towards Cameron, Arizona. At this intersection, signage makes no mention of US 180 nor is there any mention at the terminus of SR 64 at US 89.

State Route 66 is a surface road in the U.S. state of Arizona in Mohave and Coconino Counties. In 1914, the road was designated "National Old Trails Highway" but in 1926 was re-designated as U.S. Route 66. In 1985, U.S. Route 66 was dropped from the highway system. Parts of the highway were either absorbed into I-40, turned over to the state, or turned over to Yavapai County.

U.S. Route 89 highway in the United States

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Yucca, Arizona unincorporated community in Arizona, United States

Yucca is an unincorporated community in Mohave County, Arizona, United States. Located along Interstate 40, it lies southwest of Kingman, just east of the southern section of the Black Mountains and west of the Hualapai and McCracken Mountains in the Sacramento Valley. Yucca has a ZIP Code of 86438; in 2000, the population of the 86438 ZCTA was 282. Students in Yucca attend schools in the Kingman Unified School District.

Below is a list and summary of the former state highways.

Hackberry, Arizona Unincorporated community in Arizona, United States

Hackberry is an unincorporated community in Mohave County, Arizona, United States. Hackberry is located on Arizona State Route 66 23 miles (37 km) northeast of Kingman. Hackberry has a post office which serves 68 residential mailboxes with ZIP code 86411.

Seligman Commercial Historic District

The Seligman Commercial Historic District is a historic district in central Seligman, Yavapai County, northwestern Arizona.

Aubrey Valley valley in Arizona, United States of America

Aubrey Valley is a 35-mile (56 km) long valley located in southwest Coconino County, Arizona with the northwest border of Yavapai County. The valley is located at the southwest border of the Aubrey Cliffs; to the west and southwest, the Yampai Divide and the Seventyfour Plains form flatlands between four bordering mountain ranges at the northwest terminus of the Arizona transition zone.


  1. 1 2 Special Committee on U.S. Route Numbering (June 26, 1985). "Route Numbering Committee Agenda" (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 5 via Wikisource.
  2. "National Old Trails Highway" . Retrieved February 11, 2012.
  3. "Route 66 Historic Back Country Byway". Bureau of Land Management. Retrieved January 25, 2018.
  4. Special Committee on U.S. Route Numbering (June 25, 1979). "Route Numbering Committee Agenda Showing Action Taken by the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 1 via Wikimedia Commons.
  5. Arizona Department of Transportation. "ADOT Right-of-Way Resolution 1984-10-A-065" (PDF). Retrieved May 5, 2008.
  6. 1 2 3 Arizona Department of Transportation (2014). "Arizona Parkways, Historic and Scenic Roads" (PDF). Phoenix: Arizona Department of Transportation. Retrieved September 11, 2018.
  7. 1 2 Arizona Scenic Roads Map (PDF) (Map). Phoenix: Arizona Department of Transportation. Retrieved September 12, 2018.
  8. 1 2 "Historic Arizona U.S. Route 80 Designation". Tucson Historic Preservation Foundation. August 2017. Retrieved August 23, 2018.
  9. Arizona Department of Transportation. "ADOT Right-of-Way Resolution 1990-07-A-053" . Retrieved May 5, 2008.
  10. "Schoolhouse at Truxton Canyon Training School". National Park Service . Retrieved June 12, 2012.
  11. "Peach Springs Trading Post". National Park Service. Retrieved June 12, 2012.
  12. Howell, Elizabeth (April 26, 2013). "Lowell Observatory: Where Pluto Was Discovered". Space.com. Retrieved April 1, 2015.
  13. "Kingman Commercial Historic District". National Park Service. Retrieved June 12, 2012.
  14. "Seligman Historic District". National Park Service. Retrieved June 12, 2012.
  15. "Railroad Addition Historic District and Boundary Increase". National Park Service. Retrieved June 12, 2012.
  16. "La Posada Historic District". National Park Service. Retrieved June 12, 2012.
  17. "Durlin Hotel". National Park Service. Retrieved June 12, 2012.
  18. "Wigwam Village Motel 6". National Park Service. Retrieved June 12, 2012.
  19. "Painted Desert Inn". National Park Service. Retrieved June 12, 2012.
  20. "Old Trails Bridge". National Park Service. Retrieved June 12, 2012.
  21. "Walnut Canyon Bridge". National Park Service. Retrieved June 12, 2012.
  22. "Querino Canyon Bridge". National Park Service. Retrieved June 12, 2012.
  23. "Arizona Road Segments". National Park Service. October 13, 1984. Retrieved June 12, 2012.
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