The Delaware River Basin Commission (DRBC) conducted research for this report under a New Jersey Department of Environmental Protection (NJDEP) grant that supported development of a hydrodynamic model of the tidal section of Rancocas Creek. This report documents the completion of this effort, and forwards the resultant model to NJDEP. Conceptually, flows in the tidal Rancocas Creek model are driven by flows from the nontidal upstream portion of the watershed from the North and South Branches, and by the tidal boundary at the confluence with the Delaware River. During the model calibration period, nontidal flows ranged from very low to very high, providing an extraordinary opportunity to develop the model through a wide range of conditions. After a thorough screening process of model platforms, the authors recommend the use of DYNHYD5 above the other potentially suitable platforms due to several advantages.