Lewis, 28, of Walker is a Baton Rouge firefighter. He and his wife were out scouting locations for crawfish traps, his wife told authorities.
He was attempting to put their boat back on its trailer when his wife, the lone witness, noticed it was taking a long time. She checked on him only to find him floating down the Intercoastal Waterway, waving his arms in the air and yelling to her to call 911, according to Adam Einck, Wildlife and Fisheries public information officer.
When she turned back to the vehicle to retrieve the phone, she lost sight of him, Einck said.
Assumption Sheriff Mike Waguespack said sonar equipment was brought in Thursday to scan the waterway.
Divers were sent to check out a few areas that were potential targets for recovery, but to no avail, Waguespack said.
While all of their missions are considered search and recovery, Einck acknowledged that it is more likely a recovery mission than a rescue at this point.
Agencies assisting in the search include Wildlife and Fisheries; Assumption, St. Martin and East Baton Rouge sheriff’s departments; and the Baton Rouge Fire Department.