The Moose River is a beautiful mountain waterway consisting of three branches; North Branch, Middle Branch, and South Branch. In northern Herkimer County, the North Branch is formed by the outlet of Big Moose Lake. In Old Forge, the Middle Branch starts at the Fulton Chain Lakes. In Hamilton County, the South Branch starts in Little Moose Lake. After the Moose River flows westward through Herkimer County and enters into Lewis County, it merges into the Black River at Lyons Falls. Whitewater rafters, kayakers and canoeists all claim the Moose to be a favorite destination due to its high gradient as it drops out of the mountains.