Question: How long is the river on which Wilbur Dam is located?

full_context: Document 1: French Broad River: The French Broad River flows 218 mi from near the town of Rosman in Transylvania County, North Carolina, into the state of Tennessee. Its confluence with the Holston River at Knoxville is the beginning of the Tennessee River. The river flows through the counties of Transylvania, Buncombe, Henderson, and Madison in North Carolina, and Cocke, Jefferson, Sevier, and Knox in Tennessee, and drains large portions of the Pisgah National Forest and the Cherokee National Forest.
Document 2: Wilbur Dam: Wilbur Dam is a hydroelectric dam on the Watauga River in Carter County, in the U.S. state of Tennessee. It is one of two dams on the river owned and operated by the Tennessee Valley Authority. The dam impounds Wilbur Lake, which extends for about 3 mi up the Watauga to the base of Watauga Dam. Completed by 1912 the Ocoee Dam No. 1 is the only Hydroelectric dam that is older, Wilbur Dam was one of the first major hydroelectric projects in Tennessee, and remains one of the oldest dams in the TVA system.
Document 3: Nolichucky River: The Nolichucky River is a 115 mi river that flows through Western North Carolina and East Tennessee, in the southeastern United States. Traversing the Pisgah National Forest and the Cherokee National Forest in the Blue Ridge Mountains, the river's watershed is home to some of the highest mountains in the Appalachians, including Mount Mitchell, the highest point in the eastern United States. The river is a tributary of the French Broad River, and is impounded by Nolichucky Dam near Greeneville, Tennessee.
Document 4: Wheeler Dam: Wheeler Dam is a hydroelectric dam on the Tennessee River between Lauderdale County and Lawrence County in the U.S. state of Alabama. It is one of nine dams on the river owned and operated by the Tennessee Valley Authority, which built the dam in the mid-1930s as part of a New Deal-era initiative to improve navigation on the river and bring flood control and economic development to the region. The dam impounds the Wheeler Lake of 67070 acre and its tailwaters feed into Wilson Lake.
Document 5: Ocoee Dam No. 2: Ocoee Dam Number 2 is a hydroelectric dam on the Ocoee River in Polk County in the U.S. state of Tennessee. The dam impounds the Ocoee No. 2 Reservoir and is one of four dams on the Toccoa/Ocoee River owned and operated by the Tennessee Valley Authority. Ocoee Dam No. 2— which was completed in 1913— is perhaps most notable for its design, which utilizes a wooden flume that carries water from the reservoir down the side of the Ocoee Gorge to the dam's powerhouse 5 mi downstream. Ocoee No. 2 is also situated at the center of one of the nation's top whitewater rafting locations, and the dam's releases help to maintain consistent rapids on the river during warmer months.
Document 6: Swannanoa River: The Swannanoa River flows through the Swannanoa Valley of western North Carolina, and is a major tributary to the French Broad River. It begins at its headwaters in Black Mountain, NC, however, it also has a major tributary near its headwaters: Flat Creek, which begins on the slopes of Mount Mitchell. The Swannanoa River ends when it meets the French Broad at Biltmore Estate in Asheville. The river is 22 miles or 35 kilometers long, and it flows entirely within the geographical boundaries of Buncombe County. It is a valuable resource to the county, providing drinking water to the Asheville metropolitan area, and numerous recreational opportunities. In September 2004, massive rains from the remnants of Hurricane Frances and Hurricane Ivan caused the Swannanoa to flood, causing major damage to the Biltmore Village section of Asheville, and to the other communities that it flows through.
Document 7: Hiwassee Dam: Hiwassee Dam is a hydroelectric dam on the Hiwassee River in Cherokee County, in the U.S. state of North Carolina. It is one of three dams on the river owned and operated by the Tennessee Valley Authority, which built the dam in the late 1930s to bring flood control and electricity to the region. The dam impounds the Hiwassee Lake of 6000 acre , and its tailwaters are part of Apalachia Lake. At 307 ft , Hiwassee Dam is the third highest dam in the TVA system, behind only Fontana and Watauga.
Document 8: Mills River (North Carolina): The Mills River is located in Transylvania and Henderson counties, North Carolina, United States is a tributary of the French Broad River. The river flows out of the Pisgah Ranger District of the Pisgah National Forest in two forks: the North Fork, which drains the slopes just south of the Blue Ridge Parkway between Asheville and Mount Pisgah, and the South Fork, which drains the area of the Pisgah Ranger District just east of the Cradle of Forestry in America, including the slopes of Black Mountain. The Mills River flows into the French Broad River northwest of Hendersonville between NC 191 and Interstate 26.
Document 9: Watauga River: The Watauga River is a large stream of western North Carolina and East Tennessee. It is 78.5 mi long with its headwaters on the slopes of Grandfather Mountain and Peak Mountain in Watauga County, North Carolina.
Document 10: Toccoa/Ocoee River: The Toccoa River and Ocoee River are the names in use for a single 93 mi river that flows northwestward through the southern Appalachian Mountains of the southeastern United States. It is a tributary of the Hiwassee River, which it joins in Polk County, Tennessee, near the town of Benton. Three power generating dams are operated along it.
Document 11: Watauga Dam: Watauga Dam is a hydroelectric and flood control dam on the Watauga River in Carter County, in the U.S. state of Tennessee. It is owned and operated by the Tennessee Valley Authority, which built the dam in the 1940s as part of efforts to control flooding in the Tennessee River watershed. At 318 ft , Watauga is the second-highest dam in the TVA river and reservoir system (behind only Fontana), and at the time of its completion was one of the highest earth-and-rock dams in the United States. The dam impounds the TVA Watauga Reservoir of 6430 acre , and its tailwaters feed into Wilbur Lake. The Appalachian Trail crosses the top of Watauga Dam.
Document 12: Cherokee Dam: Cherokee Dam is a hydroelectric dam located on the Holston River in Grainger County and Jefferson County, Tennessee, in the southeastern United States. The dam is operated and maintained by the Tennessee Valley Authority, which built the dam in the early 1940s to help meet urgent demands for energy at the outbreak of World War II. Cherokee Dam is 175 ft high and impounds the 28780 acre Cherokee Lake. It has a generating capacity of 135,200 kilowatts. The dam was named for the Cherokee, a Native American tribe that controlled much of East Tennessee when the first European settlers arrived in the mid-18th century.
Document 13: Chatuge Dam: Chatuge Dam is a flood control and hydroelectric dam on the Hiwassee River in Clay County, in the U.S. state of North Carolina. The dam is the uppermost of three dams on the river owned and operated by the Tennessee Valley Authority, which built the dam in the early 1940s for flood storage and to provide flow regulation at Hiwassee Dam further downstream. The dam impounds the 7000 acre Chatuge Lake, which straddles the North Carolina-Georgia state line. While originally built solely for flood storage, a generator installed at Chatuge in the 1950s gives the dam a small hydroelectric output.
Document 14: Western North Carolina: Western North Carolina (often abbreviated as WNC) is the region of North Carolina which includes the Appalachian Mountains, thus it is often known geographically as the state's Mountain Region. It contains the highest mountains in the Eastern United States. Western North Carolina is sometimes included with upstate South Carolina as the "Western Carolinas", which is also counted as a single media market. The region covers an area of about 11000 sqmi , and is roughly the size of the state of Massachusetts. The population of the region, as measured by the 2010 U.S. Census, is 1,473,241, which is approximately 15% of North Carolina's total population.
Document 15: Watts Bar Dam: Watts Bar Dam is a hydroelectric dam on the Tennessee River in Meigs and Rhea counties in Tennessee, United States. The dam is one of nine dams on the main Tennessee River channel operated by the Tennessee Valley Authority, which built the dam in the early 1940s to provide flood control and electricity and to help create a continuous navigable channel along the entire length of the river. The dam is the technical boundary between the 39090 acre Watts Bar Lake— which it impounds— and Chickamauga Lake, which stretches from the dam's tailwaters southward to Chattanooga.
ground_truth: 78.5 mi