崇陽(yang)(yang)溪(xi)(xi)(xi)(xi)(xi)發源于武夷山脈(mo)崇安(an)縣(xian)崗谷(gu)(gu)(gu)鄉銅(tong)鈸山,源流上無數(shu)溝(gou)壑山澗(jian)匯成小溪(xi)(xi)(xi)(xi)(xi),西(xi)南流向,經崗谷(gu)(gu)(gu)、吳屯,過崇安(an)城關后即(ji)為(wei)崇陽(yang)(yang)溪(xi)(xi)(xi)(xi)(xi),流域面積,在(zai)建(jian)(jian)陽(yang)(yang)宸前水電站以上為(wei)5458平(ping)方公里(li)。干流長(chang)162公里(li)。崇安(an)縣(xian)境內(nei),有西(xi)溪(xi)(xi)(xi)(xi)(xi)、坑口溪(xi)(xi)(xi)(xi)(xi)、黃柏溪(xi)(xi)(xi)(xi)(xi)、九曲(星村)溪(xi)(xi)(xi)(xi)(xi)、梅溪(xi)(xi)(xi)(xi)(xi)、東溪(xi)(xi)(xi)(xi)(xi)等(deng)支(zhi)流匯入(ru)(ru)干流;建(jian)(jian)陽(yang)(yang)縣(xian)境內(nei)有崇雛(chu)溪(xi)(xi)(xi)(xi)(xi)、麻陽(yang)(yang)溪(xi)(xi)(xi)(xi)(xi)、宸溪(xi)(xi)(xi)(xi)(xi)等(deng)支(zhi)流匯入(ru)(ru)干流。徑流量極為(wei)豐富(fu),為(wei)建(jian)(jian)溪(xi)(xi)(xi)(xi)(xi)河(he)水主要補(bu)給區。河(he)流兩岸青山連綿,峽谷(gu)(gu)(gu)和寬谷(gu)(gu)(gu)相間呈串珠形態。河(he)床底質多(duo)(duo)基(ji)巖(yan)和河(he)卵石(shi),沿(yan)溪(xi)(xi)(xi)(xi)(xi)淤(yu)積砂洲甚多(duo)(duo)。溪(xi)(xi)(xi)(xi)(xi)谷(gu)(gu)(gu)交(jiao)錯(cuo),多(duo)(duo)斷崖、懸(xuan)谷(gu)(gu)(gu)。有灘瀨71處。1979年,沿(yan)溪(xi)(xi)(xi)(xi)(xi)攔河(he)閘壩后,只(zhi)在(zai)閘壩間有少數(shu)采砂作業船,運輸船絕跡(ji)。