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They are located at mile point 606.8, and control a 72.9 miles (117.3 km) long navigation pool. The locks and their associated canal were the first major engineering project on the Ohio River, completed in 1830 as the Louisville and Portland Canal, designed to allow shipping traffic to navigate through the Falls of the Ohio.
The Rough River is a 136-mile-long (219 km) [1] tributary of the Green River in west-central Kentucky in the United States. It's located about 70 miles southwest of Louisville, and flows through Breckinridge, Hardin, Grayson, and Ohio counties. Via the Green and Ohio rivers, it is part of the watershed of the Mississippi River. [2]
The Kentucky River basin endured many floods during the Great Depression. An Ohio River flood in 1936 backed into the lower Kentucky; the crest reached 42.7 feet (13.0 m) high and flooded half of Frankfort, completely isolating the city. 12,000 square miles (31,000 km 2) of the Ohio Valley were flooded in all. [14]
Kentucky is the only U.S. state to have a continuous border of rivers running along three of its sides – the Mississippi River to the west, the Ohio River to the north, and the Big Sandy River and Tug Fork to the east. [30] Its major internal rivers include the Kentucky River, Tennessee River, Cumberland River, Green River and Licking River.
The Green River is a 384-mile-long (618 km) [3] tributary of the Ohio River that rises in Lincoln County in south central Kentucky. Tributaries of the Green River include the Barren River, the Nolin River, the Pond River and the Rough River. The river was named after Nathanael Greene, a general of the American Revolutionary War. [4]
The Ohio River at Cairo is 281,500 cu ft/s (7,960 m 3 /s); [1] and the Mississippi River at Thebes, Illinois, which is upstream of the confluence, is 208,200 cu ft/s (5,897 m 3 /s). [66] The Ohio River flow is greater than that of the Mississippi River, so hydrologically the Ohio River is the main stream of the river system.
All rivers in Kentucky flow to the Mississippi River, nearly all by virtue of flowing to its major tributary, the Ohio River. Also listed are some important tributaries to the few Kentucky rivers that originate in, or flow through, other states.
The Markland Locks and Dam is a concrete dam bridge and locks that span the Ohio River. It is 1395 feet (425.2 m) long, and connects Gallatin County, Kentucky, and Switzerland County, Indiana. The locks and dam were reviewed by the Board of Engineers for River