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大(da)(da)(da)河口水(shui)電站位(wei)于重慶市酉陽縣(xian)境內(nei)阿(a)蓬江大(da)(da)(da)灘河段，是阿(a)蓬江梯(ti)級(ji)開(kai)發(fa)(fa)的(de)(de)第八(ba)個梯(ti)級(ji)水(shui)利(li)樞紐工(gong)程(cheng)，是流域內(nei)九個梯(ti)級(ji)開(kai)發(fa)(fa)最 大(da)(da)(da)的(de)(de)一(yi)個。壩址控制(zhi)流域面積4619km2，總庫容1.15億m3，總裝(zhuang)機7.5萬KW， 年發(fa)(fa)電量3.75億KW·h。是一(yi)座以發(fa)(fa)電為主，兼有防洪(hong)、灌溉(gai)、養殖、旅游開(kai)發(fa)(fa)等綜合效益的(de)(de)水(shui)電工(gong)程(cheng)。

電站樞紐工(gong)程由(you)攔河壩(ba)(ba)、發電廠(chang)房、戶內式開(kai)關(guan)站等組成。攔河壩(ba)(ba)為混(hun)凝(ning)土空腹(fu)重力(li)壩(ba)(ba)，壩(ba)(ba)頂泄洪(hong)，壩(ba)(ba)高(gao)84.5m，壩(ba)(ba)頂長393.3m。左右(you)岸非溢流(liu)(liu)(liu)重力(li)壩(ba)(ba)長分(fen)別為35.5m、15.5m，空腹(fu)溢流(liu)(liu)(liu)重力(li)壩(ba)(ba)長86m，溢流(liu)(liu)(liu)前(qian)緣(yuan)總長55m，設(she)有開(kai) 敞(chang)式溢流(liu)(liu)(liu)壩(ba)(ba)5孔，每孔寬11m，堰頂設(she)弧形工(gong)作門和(he)(he)平(ping)板(ban)檢(jian)修門，分(fen)別由(you)懸(xuan)吊式液壓 啟閉機和(he)(he)壩(ba)(ba)頂雙向門機控制。主廠(chang)房為壩(ba)(ba)內式廠(chang)房，位(wei)于空腹(fu)溢流(liu)(liu)(liu)壩(ba)(ba)內，長80m，寬 22m，高(gao)32.59m，安裝3臺單機容(rong)量為2.5萬(wan)KW的(de)水(shui)輪發電機組。

電(dian)站工(gong)(gong)(gong)程(cheng)于1993年(nian)4月經(jing)國家計委批準(zhun)立(li)項，由香港中貫集團(tuan)和黔(qian)江(jiang)區烏江(jiang)電(dian)力集團(tuan)合資建(jian)設(she)。工(gong)(gong)(gong)程(cheng)建(jian)設(she)管(guan)(guan)理實行(xing)業主(zhu)負(fu)責(ze)制,由大河(he)口(kou)水電(dian)工(gong)(gong)(gong)程(cheng)指 揮(hui)部負(fu)責(ze)工(gong)(gong)(gong)程(cheng)建(jian)設(she)管(guan)(guan)理。1992年(nian)通(tong)過議(yi)標(biao)方式，由八局(ju)承擔施工(gong)(gong)(gong)導(dao)流洞開挖和人工(gong)(gong)(gong)砂石系(xi)統(tong) 工(gong)(gong)(gong)程(cheng)。1993年(nian)7月主(zhu)體工(gong)(gong)(gong)程(cheng)及(ji)安裝(zhuang)工(gong)(gong)(gong)程(cheng)，經(jing)評(ping)標(biao)推薦，并(bing)經(jing)決標(biao)領導(dao)小組批準(zhun)確(que)定(ding)(ding)，亦(yi)由八局(ju)承建(jian)，并(bing)與大河(he)口(kou)水電(dian)工(gong)(gong)(gong)程(cheng)指揮(hui)部簽定(ding)(ding)《四川(chuan)省(sheng)黔(qian)江(jiang)地區大河(he)口(kou)水電(dian)站 第(di)三標(biao)主(zhu)體工(gong)(gong)(gong)程(cheng)土(tu)建(jian)及(ji)安裝(zhuang)工(gong)(gong)(gong)程(cheng)合同協(xie)議(yi)書》，由大河(he)口(kou)施工(gong)(gong)(gong)局(ju)負(fu)責(ze)施工(gong)(gong)(gong)。?

該工(gong)(gong)程(cheng)實物(wu)工(gong)(gong)程(cheng)總量：土石(shi)方(fang)(fang)開挖53萬m3、土石(shi)方(fang)(fang)回(hui)填7萬m3、混(hun)凝(ning)土35.23萬m3、 漿砌石(shi)2.4萬m3、帷幕灌漿43658m、固(gu)結(jie)灌漿2256m、金(jin)屬結(jie)構制作安裝1147.5t。199 3年11月開工(gong)(gong)，1994年1月河床(chuang)截流，導流洞通水，1996年12月首臺(tai)機組(zu)發電，1998年竣(jun)工(gong)(gong)。