The Dade County Department of Environmental Resources Management and other local interests request removal of sediments from the existing Miami Harbor (Miami River) Project and the Seybold Canal for the purposes of improving navigation efficiency and abating pollution. This report was prepared in response to that request through multiple congressional resolutions and authorizations. The results of these feasibility studies indicate that there is no apparent justification for either water quality work or new navigation improvements. This report does note an apparent justification for maintenance dredging of the Miami River. The removal of river sediments would allow deep draft vessels to more efficiently use the Miami River and would impede harmful sediments from being reintroduced into the river and transported to Biscayne Bay.