page_title: Apalachia Dam
section_title: Background and construction
hierarchical_section_title: Apalachia Dam / Background and construction
caption_attribution_description: English: TVA's design plan for Apalachia Dam, which was built on the Hiwassee River in Cherokee County, North Carolina, USA, in the early 1940s.
context_page_description: Apalachia Dam is a hydroelectric dam on the Hiwassee River in Cherokee County, in the U.S. state of North Carolina. The dam is the lowermost of three dams on the river owned and operated by the Tennessee Valley Authority, which built the dam in the early 1940s to provide emergency power for aluminum production during World War II. While the dam is in North Carolina, an 8.3-mile underground conduit carries water from the dam's reservoir to the powerhouse located 12 miles downstream across the state line in Polk County, Tennessee. The dam and associated infrastructure were listed on the National Register of Historic Places in 2017.
  Apalachia Dam is named for the crossroads community of Old Apalachia, located near the dam site in North Carolina, and the community's L&N railroad stop, known simply as Apalachia, which was further downstream on the Tennessee side of the state line.
context_section_description: Private and public entities had been aware of the hydroelectric potential of the Hiwassee River since the early 1900s.  The U.S. Army Corps of Engineers identified several potential dams sites, including Apalachia, in the 1920s, and by the time the Tennessee Valley Authority was formed in 1933, several companies had bought up land and flowage rights in the Hiwassee Valley.  TVA took the initiative in the valley, however, with the construction of Hiwassee Dam in the late 1930s.  By 1941, the outbreak of World War II in Europe brought a drastic increase in the demand for electricity— especially to support aluminum production in the Tennessee Valley— and TVA quickly put together a plan to build several new dams, including Apalachia, all of which were authorized July 16, 1941.  Work began on Apalachia the following day.
  The construction of Apalachia Dam and its reservoir required the purchase of 4,500 acres (1,800 ha) of land, most of which was in possession of three private entities— the Union Power Company, the Hiwassee-Nolichucky Power Company, and the Hiwassee River Power Company, with Union holding nearly half of the 4,500 acres (18 km²).  After the initial purchase, the Hiwassee-Nolichucky Power Company sold TVA an additional 8,100 acres (3,300 ha), nearly tripling the reservation size.  Land for the conduit was transferred by the U.S. Forest Service.  Since most of the land was in possession of private companies, only 22 families and 2.4 miles (3.9 km) of roads had to be relocated.
  The construction of the conduit was necessary to exploit the 12-mile (19 km) stretch of river immediately downstream from the dam site in which the river drops on average 26 feet (7.9 m) per mile.  The conduit's tunnel was built using blasting and a drill jumbo, and its  235-foot (72 m) surge tank was excavated into the rock near the valve house.
  Apalachia Dam was completed September 15, 1942, and its gates were closed February 14, 1943.  The tunnel was completed April 1, 1943.  The dam's first generator went online September 22, 1943, and a second went online November 17 of the same year.  The total cost of the project was just over $24 million.
caption: TVA's design plan for Apalachia Dam, circa 1941
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