Great Lakes Dredge & Dock Corporation (GLDD) says it has signed an US$89 million contract with the City of Decatur (IL) to provide dredging services to increase the capacity of Lake Decatur. Lake Decatur, the largest lake on the Sangamon River, was created after the river was dammed in 1922. The reservoir serves as the primary raw water source for Decatur’s 76,000 residents and large industrial sector. In recent years, the city has been forced to enact water restrictions due to low water levels and drought conditions.