Route
The Green River flows through Mammoth Cave National Park, located along river miles 190 to 205. The river drains the cave and controls the master base level of the Mammoth Cave system: the construction of a 9-foot (2.7 m) dam at Brownsville in 1906 has raised the water level in some parts of the cave system by as much as 6 feet (1.8 m) above its natural value.
The 384-mile-long (618 km) Green River, an important transportation artery for the coal industry, is open to traffic up to the closed Lock and Dam #3 (known as the Rochester Dam) at mile 108.5. Muhlenberg County, once the largest coal-producing county in the nation, benefits greatly from access to the river, as does the aluminum industry in Henderson County. In 2002, more than 10 million short tons were shipped on the river, primarily sub-bituminous coal, petroleum coke and aluminum ore.
Read more about this topic: Green River (Kentucky)
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