Dallas County authorities have found the body of a man who went underwater on the Raccoon River.At about 4:30 p.m. Sunday, rescue crews from several metro-area agencies rushed to the scene in Van Meter. Initial reports indicated that tubers were in distress. Officials told KCCI that a man in his mid-30s went underwater.Authorities have identified the man as Ricco Ray Morrow.Witnesses say Morrow had tried to help two teens who were struggling in the water before he went under himself."He knew there was a danger, and he went ahead trying to make sure the two teenagers didn't go," said William Daggett, director of public safety for Van Meter.Craig Lonneman, a conservation officer with the Iowa Department of Natural Resources, said waterways like the Raccoon River are hard to navigate and come with unseen challenges."We got some construction work going on the interstate, so they're diverting water through some tubes through a diversion channel," Lonneman said. "That's just creating a dangerous situation here."The Iowa DNR urges people to use extra caution if they're going around any of those structures.Officials have closed part of Racoon River Morrow's deathPrevious coverage: