Centennial Celebration
Historic Timeline
Assembled by
the Arizona Section
of the American Society of Civil Engineers
Celebrating 100 years
1925-2025
of the Arizona Section
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The Arizona Section of the
American Society of Civil Engineers
would like to
give special thanks to:
Lawrence A. Hansen, PhD, PE
Historical Record Search
& Timeline Subcommittee Chair
Elizabeth Olaiz-Rockwell, PE, MBA, CFM
Centennial Committee Graphic Designer
Austin Olaiz-Rockwell, PhD, PE
Centennial Timeline Website Developer
as well as the following
companies, organizations, and people
who contributed to the timeline development:
Arizona Historical Society
Arizona Department of Transportation
United States Bureau of Reclamation
Salt River Project
Arizona Public Service
Palo Verde Generating Station
City of Phoenix
Central Arizona Project
Flood Control District of Maricopa County
University of Arizona Libraries
University of Arizona Civil & Architectural Engineering and Mechanics
Arizona State University School of Sustainable Engineering and the Built Environment
Civil Engineering Magazine staff
Pima County
Carollo Engineers
Dibble Corporation
HNTB Corporation
Carey Kyler (daughter of Charles O’Bannon)
Bob Ribokas/Grand Canyon Explorer
James Bell Girand Family
Hoffman Collection/Mary Lou Vaughn
The Bolton Company/Randy Irvine & Norm Arnold
TwinPinShare/ADOT
Mariordo Roberto Duran Ortiz
Larry Hanson
Historical Record Search & Timeline subcommittee members:
Benny Young
Seth Chalmers
Enamul Hoque