Kentucky River

The Kentucky River is a tributary of the Ohio River in Kentucky, United States. The 260-mile (420 km) river and its tributaries drain much of eastern and central Kentucky, passing through the Eastern Coalfield, the Cumberland Mountains, and the Bluegrass region. Its watershed encompasses about 7,000 square miles (18,000 km), and it supplies drinking water to about one-sixth of the population of the state.

The river is no longer navigable above Lock 4 at Frankfort, as concrete bulkheads have been poured behind the upper lock gates of Locks 5–14 to strengthen the dam structures. All fourteen dams are managed by the state-run Kentucky River Authority. The primary importance of the locks today is to maintain a pool that allows the city of Lexington to draw its drinking water from the river. Although the Lexington area receives well over 40 inches (1,000 mm) of precipitation annually, the limestone karst geology of the area allows little natural surface water.