Bridging the Grand Canyon of Arizona

ARIZONA HIGHWAYS Get Acquainted With Arizona Condition of Roads On Arizona State Highway System U. S. ROUTE, 80-518 Miles-Yuma to Rodeo

U. S. ROUTE 66-396 Miles-Topock to Lupton

U. S. ROUTE 180-181 Miles-Florence Junction to State Line.

U. S. ROUTE 89-631-Miles-Nogales to Fredonia

U S. ROUTE 70-109 Miles Holbrook to State Line

STATE ROUTE 79-91 Miles-Prescott to Jerome

STATE ROUTE 88-83 Miles-Apache Junction to Globe

STATE ROUTE 81-127 Miles-Douglas to Safford

STATE ROUTE 74-121 Miles-Wickenburg to Ehrenberg

STATE ROUTE 73-104 Miles-Cutter to McNary

STATE ROUTE 187-13 Miles-Blackwater to Casa Grande

STATE ROUTE 71-26 Miles-Solomonville to Clifton

STATE ROUTE 83-28 Miles-Vail to Sonoita

STATE ROUTE 82-70 Miles-Nogales to Vail Junction

November, 1927 ARIZONA HIGHWAYS Page Fifteen Arizona Highway Department's Exhibit at the State Fair to Attract Thousands of Visitors

VISITORS from every county in Arizona and the majority of the state will view the exhibit of the Arizona Highway Department on the midway, near the entrance gates, at the Arizona State Fair, November 7 to 12, both inclusive. The exhibit is being conducted, under the personal supervision of M. C. Hankins, secretary of the Arizona State Highway Commission. More than 35,000 persons viewed the exhibit last year. The exhibit is a composite relief map 40 feet in length and four feet in width, built in eight sections, each section showing a type of highway construction, including tunnels and bridges, as well as irrigation engineering, with roads passing through irrigated sections. The building housing the exhibit was specially constructed for the purpose. It was 60 feet in length and 14 feet in width.

The exhibit, constructed last year under the direction of State Engineer W. C. Lefebvre, was built by Major J. D. York in cooperation with state highway engineers and draftsmen. Although the road is continuous each section of the map shows a separate and distinct state highway project. The map is built on the scale of ten feet to the inch, except in the Coolidge Dam section which is 20 feet to the inch, Upon entering the exhibit, the first section that confronts the visitor is a scene on the Prescott-Ashfork highway, showing the Hell Canyon curved bottom girder bridge, with the water rippling over the rocks below. The next section is a representation of the Miami-Superior Highway.

Then follows a section of the Ash Fork-Holbrook highway, with Canyon Diablo and the highway bridge across the canyon. The road then crosses over the Queen Creek Bridge, a typical concrete arch structure. Another part shows a typical flume carrying water over a wash.

The road from here leads down through an irrigated district, with lat erals, ditches, verdant fields, homes, livestock, a section which is typical of the Salt River Valley. Also there is shown a typical highway junction.

The next section is a replica of the Safford-Duncan Highway, with the steel bridge over the San Simon river. An overhead crossing of a railroad, similar to one near Prescott is reproduced.

From here the road leads to the Cool idge Dam, giving in detail the new sec tion of road to be constructed on the Globe-Rice-Safford highway through the San Carlos Indian reservation, and across the Coolidge Dam.

The dam is reproduced to scale from the plans of the new dam, showing the power house, the spillways and the pow er lines. The reservoir back of the dam was filled with water, and a pump, fur nished by the Crane Company supplied the power for pumping the water back into the reservoir after it had passed through the canals from the dam into a basin under the exhibit.

The mountains on the exhibit are constructed of wire mesh, papier mache and plaster of paris. The canals and waterways are of zinc, covered with wood stone. The road sections are of concrete and gravel surface, with the culverts and flumes furnished by the California Corrugated Culvert Company of West Berkeley, California. The high way guards on the bridge approaches and curves were miniatures built spe cially for the exhibit by the Western Metals Manufacturing company of El Paso .

SURVEY STARTED

Survey of 25 miles of roadway in Santa Cruz County, extending from the end of the paving north of Nogales to the Pima County line on the Tucson Nogales Highway, has been started by J. W. McFarlane, locating engineer, un der the direction of C. C. Small, engineer of surveys.

The curvature and grades will be re duced with a view to bringing this sec tion of the road up to Federal Aid standards. Section of road will be im proved from the $45,000 available at this time for the purpose, $20,000 from state funds and $25,000 from Federal Aid funds.