Dean Construction Co. Ltd. is one of the foremost deep foundation and marine construction companies in the Great Lakes Region. Heightened international concern over the poor quality of the Great Lakes has focused attention on the need to reduce pollution, contain or remove contaminated sediment and remediate our environment. Dean has helped to protect and restore environmentally sensitive wetlands, fish habitats and recreational areas through the construction of sediment traps, fish ladders, artificial reefs, spawning areas, and beach sills.