"It is a big area that we're looking at, so we're going to try and review the statements that we have from our eyewitnesses and narrow that down today," Matt Majors, boating accident investigator with the Tennessee Wildlife Resources Agency, told WSMV.
Morgan and his wife have four children, including Greer. The family lives in Dickson.
"Recovery efforts to locate him are underway," the family said in a statement released to WSMV. "The family is grateful for everyone's support and prayers and request(s) privacy during this difficult time."
Morgan, a U.S. Army veteran, started his music career in 2000. He's had commercial success with hits including "That's What I Love About Sunday," "Love Remembers" and "Almost Home."