永豐水(shui)(shui)庫(ku)(ku)樞(shu)紐座落在慈利(li)縣許家(jia)坊鄉(xiang)新(xin)界村境內,壩(ba)址(zhi)(zhi)下距(ju)慈利(li)縣城(cheng)75 km。水(shui)(shui)庫(ku)(ku)控制集(ji)雨面積(ji)0.71km2,壩(ba)址(zhi)(zhi)上游干(gan)流長(chang)度1.79km,干(gan)流平(ping)均坡降(jiang)63.68‰,大(da)壩(ba)為(wei)(wei)心墻土壩(ba),水(shui)(shui)庫(ku)(ku)正(zheng)常(chang)蓄水(shui)(shui)位(wei)(wei)365.60m,相應(ying)正(zheng)常(chang)庫(ku)(ku)容(rong)174萬(wan)m3,設計洪(hong)水(shui)(shui)位(wei)(wei)366.31m,相應(ying)庫(ku)(ku)容(rong)191萬(wan)m3,校(xiao)核洪(hong)水(shui)(shui)位(wei)(wei)366.65m,死水(shui)(shui)位(wei)(wei)345.5m,相應(ying)死庫(ku)(ku)容(rong)5萬(wan)m3。樞(shu)紐工(gong)(gong)(gong)程(cheng)(cheng)主要(yao)(yao)由大(da)壩(ba)、溢(yi)洪(hong)道和輸(shu)水(shui)(shui)設施等永久性建(jian)筑物(wu)(wu)組成(cheng)。工(gong)(gong)(gong)程(cheng)(cheng)于1959年2月動工(gong)(gong)(gong)興建(jian),1975年10月竣工(gong)(gong)(gong)。最大(da)壩(ba)高28.59m,壩(ba)頂高程(cheng)(cheng)367m,頂寬(kuan)4m,壩(ba)頂軸(zhou)長(chang)84m,總庫(ku)(ku)容(rong)191萬(wan)m3,是一座以(yi)灌溉為(wei)(wei)主、兼顧(gu)防洪(hong)、供(gong)水(shui)(shui)綜合利(li)用的小(xiao)(一)型水(shui)(shui)庫(ku)(ku)。根據《水(shui)(shui)利(li)水(shui)(shui)電工(gong)(gong)(gong)程(cheng)(cheng)等級(ji)劃(hua)分及洪(hong)水(shui)(shui)標(biao)準》(SL252-2000),該水(shui)(shui)庫(ku)(ku)工(gong)(gong)(gong)程(cheng)(cheng)等別為(wei)(wei)Ⅳ等,主要(yao)(yao)建(jian)筑物(wu)(wu)級(ji)別為(wei)(wei)4級(ji),次要(yao)(yao)建(jian)筑物(wu)(wu)級(ji)別為(wei)(wei)5級(ji)。