Question: What hydroelectric dam located on the Little Tennessee River in Swain and Graham counties, North Carolina, United States is home to MINIs on the Dragon is an annual gathering of MINI Coopers in Robbinsville, North Carolina? 

<P0-S0>  The dam is operated by the Tennessee Valley Authority, which built the dam in the early 1940s to accommodate the skyrocketing electricity demands in the Tennessee Valley at the height of World War II. <P0-S1>  At 480 ft high, Fontana is the tallest dam in the Eastern United States, and at the time of its construction, it was the fourth tallest dam in the world. <P0-S2> Fontana Dam is a hydroelectric dam on the Little Tennessee River in Swain and Graham counties, North Carolina, United States. <SEP> <P1-S0> Fontana Lake is a reservoir impounded by Fontana Dam on the Little Tennessee River located in Graham and Swain counties in North Carolina. <P1-S1>  The lake forms part of the southern border of Great Smoky Mountains National Park and the northern border of part of the Nantahala National Forest. <P1-S2>  Depending on water levels, the lake is about 17 mi long. <P1-S3>  The eastern end is the Tuckasegee River near Bryson City. <P1-S4>  It has an average depth of 135 ft and reaches a maximum depth of 440 ft , making it the deepest lake in North Carolina. <P1-S5>  The lake has many inlets into coves and many islands formed from former mountain peaks, especially near the eastern end. <P1-S6>  As with most dam-impounded lakes, the steep banks are exposed when water levels are low. <P1-S7>  Many towns were submerged shortly after the creation of Fontana Lake, such as Proctor and Judson. <SEP> <P2-S0> Watts Bar Dam is a hydroelectric dam on the Tennessee River in Meigs and Rhea counties in Tennessee, United States. <P2-S1>  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. <P2-S2>  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. <SEP> <P3-S0>  Started in 2003, the event takes place over the first weekend of May each year. <P3-S1>  The event is in part named after the legendary section of US 129 known as "The Dragon" which runs from North Carolina to Tennessee and has 318 curves in 11 miles. <P3-S2> MINIs on the Dragon is an annual gathering of MINI Coopers in Robbinsville, North Carolina. <P3-S3>  The event attracts over 900 attendees and over 600 MINI Coopers. <P3-S4>  The record was over 800 cars. <P3-S5>  The event primarily is attended by the newer BMW MINI Coopers but also attracts several classic Mini Coopers each year. <P3-S6>  This is the largest grassroots MINI Cooper event in the US each year. <P3-S7>  The event "headquarters" is in Fontana Village, a quaint vacation resort that was originally built to house the workers as they built the Fontana Dam during World War II. <P3-S8>  Each year MINI owners from over 30 different States and Canada make the pilgrimage to Fontana Village to participate in this event. <P3-S9>  Starting off as a three-day event, it has currently grown into its newer format of four days and includes a vendor alley, group dinners, a Brewswap, Bingo Night and a host of various drives and other activities, there is the Friday morning Dragon Parade, the Saturday night Midnight on the Dragon. <P3-S10>  Brave MINI's gather at Deals Gap and at 00:00 depart and drive the Dragon.