The Stony River is a 26.7adj=midNaNadj=mid[1] tributary of the North Branch Potomac River in Grant County in West Virginia's Eastern Panhandle. The Stony River joins with the North Branch at the Mineral County border. Its source lies north of the Dolly Sods Wilderness on the Tucker County border in the Allegheny Front. Tributaries of the Stony River include Mud Run, Red Sea Run, Morgan Run, Helmick Run, Fourmile Run, Laurel Run, and Mill Run.
Near its source, the Stony River was once dammed by the Stony River Dam to create Stony River Reservoir between 4377feet Cabin Mountain and 2733feet Fore Knobs. The center portion of the dam has since been demolished and the reservoir drained. Further north, the Stony River is dammed again to form the 1200acres Mount Storm Lake.