GRAPEVINE - Crews resumed their search Friday morning for a missing man at Grapevine Lake.
The 21-year-old man disappeared at about 5 p.m. Thursday. He was one among more than 50 guests on a party boat that made multiple stops at swimming areas around the lake, fire officials said.
During a headcount at the final stop, the boat's crew realized one person was missing.
Searchers have been focusing on an area near Mustang Island, where he was last seen on a second stop. Crews searched late into the evening Thursday, but suspended their efforts once it got dark.
Grapevine Fire Chief Steve Bass said the water in the area is about 40 feet deep.
"It's a relatively clear sandy, muddy kind of bottom here," he said. "Typically in this area there are not a lot of obstructions."
Searchers are using sonar equipment and have divers on standby.
Authorities have not released the identity of the missing man. Friday afternoon, his family traveled from out of state to the lake to standby as the search was under way.