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📘 The brown ribbon under the wing

You are crossing a river that does not look like it is in a hurry. From up here it is a single wide stroke of brown or green-brown water, held between wooded hills, with towns and bridges pinned to both banks. This is the Ohio. It starts wh

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. Ice-age channelExplain the Ohio as an ice-margin channel from Pittsburgh west.Teays blockage and Lake Tight spill formed the modern trench.
  2. Border and fallsConnect the Northwest Ordinance border and Rankin House crossings.River paired towns and Underground Railroad crossings made the water a line.
  3. Locks and floodsRead Falls of the Ohio geology, canal and lock-and-dam staircase.Devonian fossil beds and twenty locks turned rapids into managed pools.
  4. Cairo confluenceArrive at Cairo where Ohio and Mississippi waters meet.Two-tone confluence and ORSANCO drinking-water role mark the end.

Questions this course answers

Where does the Ohio River begin?

NPS and ORSANCO place the start at the confluence of the Allegheny and Monongahela in downtown Pittsburgh.

Why did Louisville grow where it did?

Indiana DNR and Falls of the Ohio materials describe a long shallow drop that forced portage and piloting.

What did the Northwest Ordinance make the Ohio?

Article VI barred slavery north-west of the River Ohio while Kentucky remained a slave state to the south.

Grounded in trusted sources

  • National Park Service — The Ohio River (Lewis & Clark National Historic Trail); Lewis's Departure from Pittsburgh
  • ORSANCO — Ohio River Facts (length, locks, cargo, drinking water, basin)
  • USGS / Wikipedia compilation of National Hydrography figures — length 981 mi; basin 203,940 sq mi; elevations at Pittsburgh and Cairo
  • Ohio Geological Survey and USGS Professional Paper 826 — Teays drainage, ice-margin Ohio, Lake Tight
  • National Archives — Northwest Ordinance, 13 July 1787, Article VI
  • Falls of the Ohio National Wildlife Conservation Area; Indiana DNR — Falls of the Ohio State Park (26-foot drop; Devonian beds)
  • U.S. Army Corps of Engineers — Louisville and Portland Canal (1830); McAlpine Locks and Dam; 20 locks and dams
  • National Weather Service, Louisville — Great Flood of 1937 (McAlpine crest 85.4 ft; 70 percent of Louisville submerged)

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

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