Pat Harrison Waterway District (PHWD) is a Mississippi State Agency with headquarters in Hattiesburg. The agency was created in 1962 with a directive of flood control in southeastern and east central Mississippi.

Flint Creek Water Park, located in Wiggins, Mississippi, is part of the Pat Harrison Waterway District, which is a Mississippi State Agency providing outdoor recreation and management of the Pascagoula River Basin. The purpose of the nine water parks located in southeast and east-central Mississippi is to provide flood control, water management, and recreation.