Streams within the forest include one of several Indian Rivers in the park (originating at Brook Trout Lake), the Red River, Cobblestone Creek, Mountain Lake Outlet, Horn Lake Outlet, Ice Cave Mountain Outlet, Benedict Brook, Muskrat Creek, Silver Run, Otter Brook, Twin Lakes Outlet, the headwaters of the North Branch of the Black River (beginning just over the hill behind Horn Lake), the South Branch of the Moose River and the 675 acres Cedar River Flow, as well as Mitchell Ponds, Lost Ponds, Twin Lakes, Icehouse and Helldiver Ponds, Beaver Lake, Squaw Lake, Balsam Lake, Stink Lake, Mountain Lake, Monument Lake, Snyder Lake, and furthest in, Horn Lake.