🌊 The River That Makes the Potomac

What you’ll learn

1. The river’s shapeTrace the South Branch from its high Virginia source to the confluence where it takes the Potomac name.The river’s course is a lesson in how folded Appalachian rock organizes valleys, gaps, and tributaries.
2. Gorges and tributariesSee how the North Fork, Seneca Rocks, Smoke Hole, and the Trough shape the river’s middle course.The South Branch alternates between farmed valley floors and remote gorges where roads give way to water and rail.
3. People, names, and bordersConnect surveying, settlement, town charters, older names, and the legal boundary around the Potomac.The river’s flat ground attracted farms and towns, while names and surveys turned a watershed into property and state lines.
4. Flood, fish, and the PotomacUnderstand the river’s flood record, introduced fishery, and final change of name.A destructive flood, a human-assisted fishery, and one confluence complete the South Branch’s story.

Questions this course answers

Grounded in trusted sources

• USGS Geographic Names Information System — South Branch Potomac River (source near Hightown, Va.; source elevation 3,520 ft; mouth east of Green Spring, W.Va.; mouth elevation 525 ft)
• USGS National Hydrography Dataset — South Branch 139 mi; North Fork South Branch 43.6 mi; South Fork South Branch 68.4 mi
• U.S. EPA South Branch Potomac River Watershed Report — basin 1,438.61 sq mi; mean discharge at mouth 1,535.65 cfs
• e-WV: The West Virginia Encyclopedia — Gerald E. Lewis, The South Branch (course, Smoke Hole and Trough access, bald eagles, smallmouth introduction); Smoke Hole
• George Washington, A Journal of My Journey Over the Mountains, March 1748 (Mount Vernon / Papers of George Washington) — Cresap opposite the mouth; travel to the South Branch; lots surveyed
• National Register nomination for Hampshire County / South Branch resources — Lord Fairfax South Branch Manor about 55,000 acres
• Virginia General Assembly, 23 December 1762 — Romney and Mecklenburg (Shepherdstown) charters
• Maryland v. West Virginia, 217 U.S. 1 (1910) — North Branch as the Potomac boundary; south bank at low water

Every Wunder lesson is built from real, reputable sources — never invented.

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