I agree with Brad B., I hired an contractor to cut the dam of an existing 3 acre lake and rebuild it couple of feet taller. He used a track hoe, track loader, and a bulldozer to do the job. One day he was short an operator, so he let me run the D6 bulldozer. Everything was going fine until I cut into a spring. The dozer was instantly stuck. He used the trackhoe to dig out and pull the dozer out. After the dam was complete I rented an ASV-100 rubber track loader and dug out the shallow end, cut some channels, built an underwater hump, a point, and placed cover. Finishing up the lake myself saved money and I really enjoyed building the structure.