Test borings and surface samples during the 1928-1930 construction of Frank D. Comerford Dam, in the Connecticut River, provided new geologic information regarding de-glaciation of the White Mountains, and became the namesake of the "Comerford Suite". The dam, located on what was once called "Fifteen Mile Falls", is now used for flood control, irrigation and generation of electrical power for transmission to New England states. At the time of its construction, it was the largest "retaining wall" in the United States, representing more than of concrete.