Justin Claus, 21, was last seen in the Lake Conroe area. He was going camping in the Sam Houston National Forest.
His father went looking for him Saturday and found his boat capsized in a foot of water.
Claus' dog went on the camping trip with him but returned home the next day.
Anyone with information on his whereabouts is asked to call the Montgomery County Precinct 1 Constable's Office at 281-364-4211 or Texas EquuSearch at 281-309-9500.