Condon-Johnson & Associates is proud of a long and successful record installing Drilled Shafts of all sizes and depths. Our fleet of modern drills includes the very best of North American and European designs. Shafts range from diameters of 18 inches to greater than 12 feet and to depths of 160 feet. CJA is adept at slurry drilling and cased methods including casing rotation and vibration. Our shafts, which are regularly tested through advanced non-destructive methods, receive approval ratings high above industry standards.