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ABSTRACT
The results of dredging at Liberty Lake offer some valuable lessons for the conduct of sediment removal operations for lake restoration objectives. It was planned that approximately 50 ha were to be dredged at Liberty Lake. Differing dredge patterns were produced by two different contractors who performed the actual work, which included the removal of over 4 × 105 m3 of sediment material. In Area 1, deeply dug trenches were separated by undredged rows, while the bottom contour was more uniform in Area 2. The trenching pattern resulted in an actual dredged area of only about 21 ha. Because of slumping of undredged material into the trenches, and because of the remaining pool of high-phosphorus sediments, the dredging at Liberty Lake, especially in Area 1 was not as successful in reducing internal phosphorus loading as anticipated. In addition, macrophyte control from the dredging was not realized in Area 1, as macrophyte regrowth has been rapid. Some considerations for sediment removal in lake restoration projects are suggested.