|Carries||US 89A 2nd only|
|Crosses||Colorado River at Marble Canyon|
|Official name||Navajo Steel Arch Highway Bridge|
|Other name(s)||Grand Canyon Bridge 1st (originally)|
Colorado River Bridge 2nd
|Named for||Navajo people|
|Owner||Arizona Department of Transportation (ADOT)|
|Heritage status||National Register of Historic Places 1st only|
|ID number||AZ00051 1st|
|Preceded by||Glen Canyon Dam Bridge|
|Followed by||Hoover Dam|
|Design||open-spandrel arch bridge with 90 feet (27 m) rise (both)|
|Total length||834 feet (254 m) 1st|
909 feet (277 m) 2nd
|Width||18 feet (5.5 m) 1st|
44 feet (13 m) 2nd
|Longest span||616 feet (188 m) 1st|
726 feet (221 m) 2nd
|No. of spans||1 (each bridge)|
|Piers in water||0|
|Load limit||22.5 short tons (20.4 t) 1st|
|Clearance below||467 feet (142 m) 1st|
470 feet (140 m) 2nd
|Construction start||June 1927 (1st)|
May 1993 (2nd)
|Construction end||1929 (1st)|
|Construction cost||$US 390,000 1st (equivalent to $4.6 million in 2019 dollars)|
$US 14.7 million 2nd
|Opened||January 12, 1929 (1st)|
May 2, 1995 (2nd)
Navajo Steel Arch Highway Bridge
|Architect||Arizona Highway Department|
|MPS||Vehicular Bridges in Arizona MPS|
|NRHP reference No.||81000134|
|Added to NRHP||August 13, 1981|
Navajo Bridge is the name of each of a pair of steel spandrel arch bridges that cross the Colorado River in the Grand Canyon National Park[Note 1] (near Lees Ferry) in northern Coconino County, Arizona, United States. The newer bridge of the pair carries vehicular traffic on U.S. Route 89A (US 89A) over Marble Canyon between Bitter Springs and Jacob Lake, allowing travel into a remote region north of the Colorado River including the North Rim of Grand Canyon National Park.
Prior to completion of the first Navajo Bridge, one of the only Colorado River crossings between Arizona and Utah was located about 5 miles (8.0 km) upstream from the bridge site, at the mouth of Glen Canyon where Lees Ferry service had operated since 1873. The ferry site had been chosen as the only relatively easy access to the river for both northbound and southbound travellers. By the 1920s, automobile traffic began using the ferry service though it was not considered a safe and reliable crossing as adverse weather and flooding regularly prevented its operation.
The dedication of the original bridge was on June 14–15, 1929 with an official name of the Grand Canyon Bridge. The state legislature changed the name to Navajo Bridge five years later in 1934. After the new bridge was opened in 1995, the original bridge was closed to vehicular traffic, but is still open for pedestrian and equestrian use.
The dual spans of Navajo Bridge are tied at ninth place among the highest bridges in the United States with nearly identical heights of 467 feet (142.3 m) for the original span, and 470 feet (143.3 m) for the second span.
Construction of the original Navajo Bridge began in 1927, and the bridge opened to traffic in 1929. The bridge was paid for by the nascent Arizona State Highway Commission (now the Arizona Department of Transportation) in cooperation with the United States Department of the Interior's Bureau of Indian Affairs, as the eastern landing is on the Navajo Nation. The steel spandrel bridge was designed and constructed by the Kansas City Structural Steel Company. During construction, worker Lane McDaniel died after falling 470 feet (140 m) to the Colorado River below. Supervisors had rejected the idea of rigging safety netting, believing that it would catch on fire from falling hot rivets.
The original bridge is 834 feet (254 m) in length, with a maximum height of 467 feet (142 m) from the canyon floor. The roadway offers an 18-foot (5.5 m) surface width with a load capacity of 22.5 tons (although the posted legal weight limit was 40 tons). During the design phase, a wider roadway was considered, but ultimately rejected, as it would have required a costly third arch to be added to the design, and the vehicles of the time did not require a wider road. When the Bridge officially opened on January 12, 1929, the Flagstaff paper proclaimed it "the biggest news in Southwest history." 
By 1990, however, officials decided that the traffic flow was too great for the original bridge and that a new solution was needed. The sharp corners in the roadway on each side of the approach had become a safety hazard due to low visibility, and deficiencies resulting from the original design's width and load capacity specifications were becoming problematic. The bridge had also become part of US 89A.
Deciding on a solution was difficult, due to the many local interests. Issues included preservation of sacred Navajo land, endangered plant species in Marble Canyon, and the possibility of construction debris entering the river. The original proposal called for merely widening and fortifying the bridge, but this was ultimately rejected as not able to meet contemporary federal highway standards. Replacement became the only option, and it was eventually decided to entirely discontinue vehicular traffic on the original bridge. A new bridge would be built immediately next to the original and have a considerably similar visual appearance, but would conform to modern highway codes.
The new steel arch bridge was commissioned by the Arizona Department of Transportation and the Federal Highway Administration, and was completed in May 1995, at a cost of $14.7 million. A formal dedication was held on September 14, 1995.
The original Navajo Bridge is still open to pedestrian and equestrian use, and an interpretive center has been constructed on the west side to showcase the historical nature of the bridge and early crossing of the Colorado River. The original bridge has been designated as a Historic Civil Engineering Landmark, and was placed on the National Register of Historic Places on August 13, 1981.
Original bridge (1929)
Total length: 834 feet (254 m)
Steel arch length: 616 feet (188 m)
Arch rise: 90 feet (27 m)
Height above river: 467 feet (142 m)
Width of the roadway: 18 feet (5.5 m)
Amount of steel: 2,400,000 pounds (1,100,000 kg)
Amount of concrete: 500 cubic yards (382 m3)
Amount of steel reinforcement: 82,000 pounds (37,000 kg)
Construction cost: $390,000 (equivalent to $5.81 million in 2019)
New bridge (1995)
Total length: 909 feet (277 m)
Steel arch length: 726 feet (221 m)
Arch rise: 90 feet (27 m)
Height above river: 470 feet (143 m)
Width of the roadway: 44 feet (13 m)
Amount of steel: 3,900,000 pounds (1,800,000 kg)
Amount of concrete: 1,790 cubic yards (1,370 m3)
Amount of steel reinforcement: 434,000 pounds (197,000 kg)
Construction cost $14.7 million (equivalent to $24.66 million in 2019)
- List of bridges in the United States by height
- List of bridges on the National Register of Historic Places in Arizona
- National Register of Historic Places listings in Coconino County, Arizona
- While the Navajo Bridges are officially located in the Grand Canyon National Park, the actual location is a little more complicated. The southeast approach to the bridges is located within the Navajo Nation, which was original established in 1868 and had its boundaries extended west to the east rim of Marble Canyon prior to the construction of the first bridge in 1929. The northwest approach to the bridges is located within the Glen Canyon National Recreation Area, having been established in 1972 (well after the construction of the first bridge, but a few decades prior to the construction of the second).
The bridges themselves span Marble Canyon. In 1965 the Marble Canyon National Monument was established and included the section of the Colorado River between the canyon rims from the (then) northeastern boundary of the Grand Canyon National Park (which was established in 1919) to Lees Ferry. However, in 1975, the entirety of the Marble Canyon National Monument was added to the Grand Canyon National Park.
- "Navajo Bridge". nps.gov. National Park Service. Retrieved May 18, 2020.
- "National Register Information System". National Register of Historic Places. National Park Service. July 9, 2010.
- "The American Presidency Project: Proclamation 3889 – Establishing Marble Canyon National Monument, Arizona". presidency.ucsb.edu. University of California, Santa Barbara. January 20, 1969. Retrieved May 22, 2020.
- Repanshek, Kurt (January 2, 2010). "Pruning the Parks: Whatever Became of Marble Canyon National Monument (1969–1975)?". nationalparkstraveler.org. Park City, Utah: National Parks Traveler. Retrieved May 22, 2020.
- Ghiglieri, Michael P.; Myers, Thomas M. (2001). Over the Edge: Death in Grand Canyon (First Edition, sixth printing, first revision ed.). p. 25. ISBN 0-9700973-0-1.
Months later, on June 12, 1928, Lane McDaniels, age 42, was working on the partially constructed Navajo Bridge at River Mile 4. Despite this being the tallest steel bridge in the world at the time, the supervisors vetoed rigging safety netting under the bridge because they were sure that hot rivets dropping by accident might ignite it. McDaniels, unfortunately, missed his footing on a scaffold. He fell. And there being no net, he plummeted about 470 feet into the Colorado River. His fellow workers stared down in horror. They said that, upon impact, McDaniels' body seemed to "burst and flatten out" on the surface of the water. Four steelworkers quit after McDaniels death, not from fear of falling, but from the dismal prospect of being swallowed up by the turbulent waters of the Colorado if they did fall, with no hope that their bodies would ever be recovered.
- Gulliford, Andrew. "Up in the air, a living memorial". High Country News. High Country News. Retrieved September 22, 2020.
- "Glen Canyon". National Park Service. National Park Service. Retrieved September 22, 2020.
|Wikimedia Commons has media related to Navajo Bridges.|
- Excellence in Highway Design: Navajo Bridge (archive)
- Historic American Engineering Record (HAER) No. AZ-28, "Navajo Bridge, Spanning Colorado River at U.S. Highway 89 Alternate, Page vicinity, Coconino County, AZ"
- American Society of Civil Engineers – Navajo Bridge (archive)
- Navajo Arch Bridge (original) at Structurae
- Navajo Bridge (new) at Structurae (note: year of completion is listed incorrectly as 1997)
- 85 photos from the construction of Grand Canyon/Navajo bridge
- U.S. Geological Survey Geographic Names Information System: Navajo Bridge