Bill Groth, AECOM Project Manager, represented Morris-Knudsen Company, now a legacy company of AECOM, speaks during the 75th Anniversary Commemoration of Dale Hollow Dam and Reservoir in Celina, Tenn., Oct. 19, 2018. He noted how the contractor built the dam in a year and a half, which is half the time it normally takes to construct a dam the size of Dale Hollow Dam.