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Three watershed models are used to simulate the point and non point source loads draining off the Caloosahatchee River Watershed between 2003 through 2005. These models are 1) the Hydrologic Simulation Model in Fortran (HSPF), 2) the Watershed Management Model (WMM), and 3) the Watershed Assessment Model (WAM-View). The Caloosahatchee River watershed is over 1,300 square miles of low relief land that contains a 25 mile long tidal portion separated from the freshwater up-river area by a canal dam structure. Most of the water flowing through the River originates in Lake Okeechobee which plays a major role on the river water quality. Besides slowing the flow of the tributaries draining into the Caloosahatchee River, the flat terrain also increases the extent of the tidal influence up the tributaries of the western Caloosahatchee. These tidally impacted tributaries are part of the watersheds to be modeled, thus presenting a complication not easily handled by most watershed models.