Length from the Fairfax Stone in WV to the mouth at the Chesapeake Bay: 382 miles

Width at its mouth, measured between Point Lookout in MD and Smith Point in VA: 11.3 miles

Average width from Washington to Harpers Ferry: 1,500 feet

Elevation at the Fairfax Stone: 3,125 feet above sea level

Total Watershed: 14,670 square miles. Virginia = 5,723 sq. mi., Maryland = 3,818 sq. mi., West Virginia = 3,490 sq. mi., Pennsylvania = 1,570 sq. mi., and Washington DC = 69 sq. mi.

Shenandoah River Watershed: 3,000 square miles.

Water Flow: Average flow is approx. 7 billion gallons per day. The largest flow measured at Washington, DC, in March 1936 was 275 billion gallons per day. The lowest flow in September 1996, was 388 millon gallons per day before water supply withdrawals.

Water Supply Withdrawals: 486 million gallons are taken out of the river for drinking water every day for the DC area.