Dredging work is underway for the year in two parts of Lake Decatur, with more than half of the $91 million project now complete. Great Lakes Dredge and Dock, the city’s contractor on the project, started work March 31 in Basin two and the Sand Creek area, said Keith Alexander, the city’s director of water management. The crews shut down for the winter each year. Because Basin two includes the Nelson Park shoreline, this part of the work is when boaters are most likely to encounter the dredging equipment that includes booster stations, the large dredge and a significant length of floating dredge pipeline. No major boating accidents have occurred since the project began in fall 2014, Alexander said, but there have been a few run-ins.