The Delaware River is one of the last large free-flowing rivers left in the contiguous 48 states - one of the last major rivers without any dams or control structures on its main stem. It is considered to be a river of exceptional water quality. For 40 miles the Middle Delaware River passes between low forested mountains with barely a house in sight. Then the river cuts through the mountain ridge to form the famed Water Gap. Leashed pets are allowed in most park areas. Leashes must be no longer than six feet. They are not allowed on the McDade Trail, at Milford Beach, Hidden Lake Beach, Smithfield Beach or on the mowed areas at Kittatinny Point Visitor Center, Bushkill Visitor Center, Watergate Recreation Site or Hialeah Picnic Area. Pets are not allowed in any of the campsites in New Jersey.