7504 Colton-Bluff Springs Road
Austin, TX 78744
Phone 512.647.9370
235 Morgan Avenue
Dallas, Texas 75203
Phone 214.941.3808 | Fax 214.943.7645
Texas Firm Registration #F-1238


HJA staff conducts and provides consulting geotechnical engineering, engineering geology, geomechanics and construction materials testing and inspection services for geotechnical investigations… (more)

About Us

HJA's long history in the North Texas area makes it uniquely qualified to perform the services requested by each client. The professionals at HJA have studied and evaluated soil and rock conditions… (more)


Since its establishment over 60 years ago, our firm has offered and developed a wide range of technical expertise and special qualifications involving the geologic formations and settings found in the Southwest and the impact these subsurface conditions have on the built environment... (more)

Henley-Johnston & Associates, Inc., a privately owned Texas Corporation, was established to provide consulting geotechnical engineering and geosciences services from Dallas, Texas, over 60 years ago and is a leader and innovator in this highly specialized field of civil engineering and geology. Since inception, in 1951, the firm has provided engineering consulting and testing services in the professional fields of geotechnical engineering, engineering geology, geomechanics (soil and rock), foundation engineering, and construction materials engineering, inspection and testing. Henley-Johnston & Associates, Inc. (HJA) brings forth an unparalleled record of experience and achievement in working with major geologic formations underlying the greater northern Texas and southern Oklahoma subsurface region.

Recent Projects

One Arts Plaza
Dallas, TX

Castle Hills Development
Lewisville, TX

Kimbell Art Museum
Fort Worth, TX

Celina High School
Celina, TX

One Victory Park
Dallas, TX

Custer Road Pump Station
Plano, TX