Arizona's Historic Bridges
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About this ebook
Jerry A. Cannon
Jerry A. Cannon is a registered engineer and is well regarded in Arizona for preserving old bridges. Patricia D. Morris is an urban planner and restoration advocate. They tell the story of the state's historic bridges with photographs provided by the Arizona Department of Transportation, Arizona State Historical Societies, private collections, and others.
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Arizona's Historic Bridges - Jerry A. Cannon
authors.
INTRODUCTION
The history of Arizona began long before the arrival of Europeans, but most of the oral stories of Native Americans were not written down. It would take the efforts of archeologists and anthropologists to reveal many of them. The Spanish explorers came in 1593, with Fray Marcos de Niza, followed by Francisco Vasquez de Coronado, and they kept detailed records of their journeys. Arizona was part of the state of Sonora, Mexico, until the Mexican-American War ended in 1848. Arizona’s territorial boundary with Mexico became the Gila River. It would take the Gadsden Purchase in 1853 to establish the future state’s southern boundary. This block of land, which also included a part of New Mexico, was purchased to extend the transcontinental railroad westward along a southern route. The building of the railroads and bridges created bawdy towns overnight, but they lasted only as long as the project. Roadways were built alongside many of the railroads, and the automobile soon eclipsed the rail and wagon paths.
Arizona became a state when Pres. William Howard Taft signed the statehood bill on Valentine’s Day in 1912 surrounded by an entourage of politicians and local Arizonans. Carl Hayden, Arizona’s first congressman and champion of many public works and infrastructure projects, was somewhere in that room. New Mexico had been declared a state five weeks earlier, and the Titanic would sink only two months later. These events, hopeful and tragic, would portend the interesting times to come for the nation’s sixth-largest state.
The declaration of statehood jump-started the building of bridges, dams, and highways. Most of the early bridges were concrete and could span only short chasms, but with the appointment of territorial and state engineers, the structures became more sophisticated and utilized the latest design concepts. J.B. Girand, Lamar Cobb, Daniel Luten, and Ralph Hoffman are some of the early engineers who made their mark by progressively advocating new building methods and materials while trying to keep costs down, a dilemma that has yet to be solved. Concrete arch bridges eventually evolved to allow longer spans. Steel trusses, with their plethora of patented types (Warren, Pony, Pratt, Camelback, and others), came into vogue. The steel parts were fabricated in the Midwest. Local labor, including prisoners, Native Americans, former miners, and farmers, was used to construct the abutments and piers as a cost-saving measure. These workers often had to fabricate tools, bolts, and other parts in the field, since it would have taken too long to get factory replacements.
The public was becoming tired of the rusting steel structures, which reminded them of places they had left. With the World’s Columbian Exposition in Chicago in 1893, people came to appreciate what an ideal city could look like, with white streetlights, clean buildings and bridges with elegant lines, and hard-surfaced streets. The City Beautiful movement was born. It focused on the systems of city life that could be controlled by a local government: public building styles, zoning, parks, transportation, and streetscapes. It was an interdisciplinary approach to urban design and infrastructure planning.
In Arizona, pressure was building for longer spans and more aesthetically appealing bridges. Luten concrete arches with decorative side railings, similar to those seen at the Chicago fair, became popular throughout the state (Padre Canyon, Winkelman, Miami, Holbrook). Steel suspension bridges were built over the Little Colorado River (Cameron Bridge) and Gila River (McPhaul Bridge). Another idea put forth by the young state bridge engineer Ralph Hoffman was to build the majority of the mass of the structure underneath the bridge. He did not want it to detract from the visual surroundings, whether it was the magnificent Marble Canyon near the Grand Canyon, or the rather minor Sand Hollow Wash near the Nevada-Utah border. The innovative practices of these engineers, and public opinion, were critical in the evolution of Arizona bridges. Some of the modern bridges utilize the visionary practices of these early pioneers to integrate the structure into the landscape and to recognize its natural beauty. Other bridges have aesthetically suffered from concerns over lawsuits and have been designed with so many safety features that drivers are unaware they are crossing a bridge and that there is a view over the side.
In 2012, as part of the centennial celebrations of Arizona statehood, the coauthors put together a slide show about Arizona’s historic bridges, most of which are in the National Register of Historic Places. The presentation was taken on the road throughout the state and delivered to various engineering and historical groups. Feedback was positive, but almost everyone wanted to find out the location of and more information about these historic bridges. Hence, this book project was born. It is organized around the major historical routes or roads as much as possible and gives general directional information so that the reader can explore the exact coordinates via other sources, such as the website of the National Register of Historic Places. Some of the bridges appear in more than one chapter because they were the focal points of the ever-changing routes. It was often a challenge to figure out where a bridge was in relation to the historic route, and vice versa.
Engineering and hydrology are not perfect sciences. Judgment is required, and early engineers did not have the data to readily analyze the unpredictable seasonal flows and scour patterns of Arizona’s watercourses. Other bridges were designed for much lighter loads than what is needed for today’s vehicles. Many bridges did not survive, but they were usually replaced with a better design. Some have been restored to their original glory. There are many, however, that need attention and large amounts of money. Local governments have many challenges when it comes to funding, but with the assistance of the federal government, there are great examples around the state that link bridge rehabilitation with economic and tourism resurgence. We hope that this book can elevate enthusiasm for restoration efforts or, if nothing else, encourage a very cool road trip or two.
One
US ROUTE 66
Route 66, from Chicago to Los Angeles, did not follow a predictable or historic route, as did other major highways at the time. It dug its way diagonally across Illinois and Missouri and dipped