Madatsar ruwa ta Kainji wata madatsar ruwa ce da ke hayin Kogin Neja a Jihar Neja ta Tsakiyar Nijeriya . (haɗin gwiwar ƴan kwangila daga Italiya ne sukayi dam ɗin) ne ya aiwatar da gina madatsar ruwan don tsarawa ta da kuma ƙwararru da Balfour Beatty da Nedeco, kuma an fara shi a 1964 an kammala shi a 1968. Jimlar kudin da aka kiyasta sun kai dalar Amurka miliyan 209 (kwatankwacin kusan dalar Amurka biliyan 1.3 a dala ta 2019 [1] ), tare da kashi daya cikin hudu na wannan kudin don sake tsugunar da mutanen da aikin gina madatsar ruwa da madatsar ruwa ta, Kainji dam ya daidaita . Kainji Dam ya faɗaɗa kimanin kilomita 10 kilometres (6.2 mi) gami da madatsar ruwan sirdinsa, wanda ke rufewa daga kwarin tara haraji . Bangaren firamare a fadin fitowar zuwa Niger shine 550 metres (1,800 ft) Yawancin ginin an yi su ne daga ƙasa, amma sashin tsakiya, wanda ke ɗauke da injin tobin wanda ake haƙa dashi a cikin ruwa na hydroelectric, an gina shi ne daga kankare. Wannan sashin 65 metres (213 ft) babba Madatsar ruwa ta Kanji tana daga cikin manyan madatsun ruwa a duniya.