永(yong)豐水(shui)庫樞紐(niu)座落在(zai)慈(ci)利縣許家坊鄉新界村境(jing)內,壩址下距(ju)慈(ci)利縣城75 km。水(shui)庫控制集雨(yu)面(mian)積0.71km2,壩址上游干(gan)流長度1.79km,干(gan)流平均(jun)坡(po)降63.68‰,大(da)壩為心(xin)墻土壩,水(shui)庫正常(chang)蓄水(shui)位365.60m,相應正常(chang)庫容174萬m3,設計洪(hong)水(shui)位366.31m,相應庫容191萬m3,校核洪(hong)水(shui)位366.65m,死(si)水(shui)位345.5m,相應死(si)庫容5萬m3。樞紐(niu)工(gong)程(cheng)(cheng)主(zhu)要(yao)由大(da)壩、溢洪(hong)道和(he)輸水(shui)設施(shi)等(deng)(deng)永(yong)久性建(jian)(jian)筑物組成。工(gong)程(cheng)(cheng)于1959年(nian)2月(yue)動工(gong)興建(jian)(jian),1975年(nian)10月(yue)竣工(gong)。最(zui)大(da)壩高28.59m,壩頂(ding)高程(cheng)(cheng)367m,頂(ding)寬4m,壩頂(ding)軸長84m,總庫容191萬m3,是一座以灌溉為主(zhu)、兼顧防洪(hong)、供水(shui)綜(zong)合利用(yong)的小(一)型(xing)水(shui)庫。根據《水(shui)利水(shui)電工(gong)程(cheng)(cheng)等(deng)(deng)級劃(hua)分及洪(hong)水(shui)標準》(SL252-2000),該水(shui)庫工(gong)程(cheng)(cheng)等(deng)(deng)別(bie)為Ⅳ等(deng)(deng),主(zhu)要(yao)建(jian)(jian)筑物級別(bie)為4級,次要(yao)建(jian)(jian)筑物級別(bie)為5級。