A series of load tests were performed underwater at the site of a new gated dam to be constructed by the U. S. Army Corps of Engineers. Axial and lateral loading tests were performed on 60 to 66-inch drilled shafts in a siltstone with a compressive strength ranging from 50 to 300 psi, overlain by a granular alluvium. The dimensions of the excavations were measured prior to placement of concrete using a caliper system developed by LCR&A for the project. The concrete integrity was determined prior to load testing using cross-hole sonic loading and gamma density logging. Lateral loads up to 355 kips were applied in the lateral loading tests using an underwater loading system and axial capacities of over 6,700 kips were measured in the axial loading tests using Osterberg load cells. Instrumentation included load cells, vibrating wire strain gages on reinforcing steel, vibrating wire concrete embedment strain gages, in-place inclinometers, telltales, electro-level beam sensors, and shaft-head displacement gages. All instrumentation was monitored using dual-computer controlled data loggers monitoring over 140 gauges.