Tagokura Dam

This dam was built in the upper reaches of the Tadami River in western Fukushima Prefecture. It is located in Tadami Town, Minamiaizu County. Its dam height is 145 meters, its length is 462 meters, and its effective water storage capacity is 370 million cubic meters, which is more than Lake Inawashiro's 330 million cubic meters. Its water area is 9.9 square kilometers. After World War II, the Tadami River Watershed Comprehensive Development Project was carried out as part of the specific regional development projects based on the National Land Comprehensive Development Act, and the construction of this dam and power plant was one of the most important projects. The Electric Power Development Company was in charge of the construction, and construction of the dam began in 1953 (Showa 28) and was completed in 1961. Construction of the power plant was also carried out in parallel, and partial power generation began in 1959, and was completed in 1961 with an output of 380,000 kilowatts. The electricity is sold to both the Tokyo and Tohoku electric power companies. At the time of construction, there were no railways or roads for transporting materials, and the Japanese National Railways (now JR) opened the Aizu Line (now the Tadami Line) between Aizu-Miyashita and Aizu-Kawaguchi, which the Electric Power Development Company extended to Tagokura as a construction-only line. The issue of compensation for the relocation of approximately 50 submerged houses also proved difficult, and an agreement was finally reached in 1956. The surrounding area has returned to being a quiet mountain village, and the dam and Lake Tagokura have become valuable tourist resources as part of the Echigo Sanzan Tadami Quasi-National Park. The construction-only line also runs to Uonuma City in Niigata Prefecture as the JR Tadami Line, connecting with the Joetsu Line.

[Shiro Watanabe]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

福島県西部、只見川(ただみがわ)上流につくられたダム。南会津(あいづ)郡只見町にある。堤高145メートル、長さ462メートル、有効貯水量は3億7000万立方メートルあり、猪苗代(いなわしろ)湖の3億3000万立方メートルよりも多い。湛水(たんすい)面積は9.9平方キロメートル。第二次世界大戦後、国土総合開発法に基づく特定地域開発事業の一環として只見川水系総合開発事業が行われ、そのなかの最重点事業の一つがこのダムと発電所の建設であった。電源開発会社が工事を担当し、1953年（昭和28）ダムの建設に着工し、1961年に完成した。発電所の建設も並行して進められ、1959年に一部発電を始め、1961年には完成して38万キロワットの出力をみた。電力は東京、東北の両電力会社に販売。建設当時は資材輸送の鉄道や道路もなく、国鉄（現、JR）が会津線（現、只見線）の会津宮下―会津川口間を開通し、電源開発会社がそれを田子倉まで延長して工事専用線とした。また約50戸の水没家屋の移転補償問題も難航し、最終的に合意が成立したのは1956年である。周囲は静かな山村に戻り、ダムや田子倉湖は越後(えちご)三山只見国定公園の一部として貴重な観光資源となっている。工事専用線もJR只見線として新潟県魚沼(うおぬま)市まで通じ、上越線と接続している。

［渡辺四郎］

出典　小学館　日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について　情報 | 凡例