How deep is Built-A-Raft River? The water in the Build-A-Raft River is 3 feet deep. Was this article helpful? Related articles Is the water heated in the Water Park? Can children who can’t swim ride the slides? Is there shade in the Water Park? Is there an area to lay down towels and sit in the Water Park? Can a special needs guest use their floating wheelchair in the Build-A-Raft River?