The Delaware River Story: Water Wars, Trout Tales, and a River RebornThe Delaware River flows some 330 miles from its headwaters near Hancock, New York, to the mouth of the Delaware Bay. It is the longest free flowing river east of the Mississippi and one of America's most important rivers. Not only is it the primary water supply for New York City, but it provides clean drinking water to every home within a 150 mile radius. When the reservoirs were built on the East and West Branches, they disrupted the natural flows