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CTL|Thompson Founder Bob Thompson Receives the ENR Mountain State Legacy Award

by Tracy Henderson

October, 2017

CTL | Thompson founder Bob Thompson has been named as the 2017 recipient of the ENR Mountain States Legacy Award.  CTL | Thompson is the largest full-service geotechnical, structural, environmental and materials engineering firm headquartered in Denver.

Thompson was honored at the ENR Mountain States 2017 Best Projects breakfast on Oct. 25. The prestigious award recognizes an individual who has achieved a lifetime legacy of service in design and construction. Recipients have contributed above and beyond to the engineering profession and their communities.

In his 55-year career, Thompson emerged as a national leader for devising engineering solutions to challenging slope stabilization and earth retention projects, especially in mountainous areas. He is also one of the foremost experts on expansive soil behavior and introduced technologies and testing that more effectively evaluated swell potential, prediction of heave, and mitigation techniques for building in expansive soil regions.  Finally, Thompson has led the field on foundation design, mine remediation and anchor wall design for large excavations. His firm, CTL | Thompson, has provided geotechnical, structural and environmental expertise and materials testing on an estimated 100,000 residential and commercial building projects.

“Bob’s work cast a long shadow on our industry, the Colorado community, and the individuals he mentored and taught,” said CTL | Thompson Vice President Marc Cleveland. “Most of our leadership team has stayed with the company for 20-plus years, because of the corporate culture created by Bob, the remarkable wisdom he has imparted and the many essential and exciting projects that his leadership attracted to the firm.”

ENR Mountain States also recognized Thompson’s commitment to elevating engineering practices. Specifically, his work established standard practices for geotechnical firms across the U.S. In 1995, Thompson joined forces with like-minded colleagues to establish what became the Colorado Association of Geotechnical Engineers (CAGE). He also was Past President with ASFE (GBA) and served on a board charged with accreditation approval for college engineering schools at universities nationwide.

One of a Kind Helical Pile Testing Lab

Thompson’s work had a major impact on foundations, and specifically the growing use of helical piles for stabilization. CTL | Thompson participated in the original development of the primary evaluation standard, AC358, for helical products to be certified by ICC-ES.

In 2007, CTL | Thompson gained accreditation with the International Accreditation Service (IAS) for ISO-17025 (Testing Laboratory TL-342 per AC89) to perform testing of helical products for the requirements of AC358. CTL’s testing lab is the only lab in the world that can perform every aspect of AC358.  In addition, the firm is accredited to perform testing for AC443, Screw Piles, and AC406, Segmented Push Piles.  As a part of the primary accreditations, CTL is also specifically accredited for ASTM Standards for full scale foundation load testing D1143, D3689 and D3966, as well as ASTM Standards for concrete C 31 and C 39.

The firm maintains a 1,000,000 inch-pound torsion bench along with a wide variety of fixtures, load frames and other laboratory equipment necessary to fulfill the requirements of AC358, AC443 and AC406. CTL is also accredited for ISO-17020 (Inspection Agency AA-735 per AC304) to provide quality inspections of manufacturing facilities for AC10.  Our Colorado based inspection staff regularly travels worldwide to offer critical review of quality processes and programs for helical manufacturers.

Bob and his team have collaborated with more than 30 helical pile foundation manufacturers -- the bulk of the industry – on testing, document preparation, assistance with ICC-ES interface, structural product calculations and even helical pile engineered design for specific building sites.

CTL | Thompson now has nine offices throughout Colorado and Wyoming. It celebrated its 45th anniversary last year.

About CTL|Thompson

CTL | Thompson is a full-service geotechnical, structural, environmental and materials engineering firm. Established in 1971, the firm currently employs 230 technical and non-technical employees and provides expertise in small and large-scale projects in all areas of construction. CTL|Thompson is headquartered in Denver and has offices in Fort Collins, Pueblo, Colorado Springs, Glenwood Springs and Summit County, Colorado, and Cheyenne, Wyoming. For more information, please visit

Engineering leader established engineering practices that paved the way for Colorado’s growth

CTL | Thompson