一街河,位于中华人民共和国云南省西部,是元江上游礼社江段左岸支流,发源于南华县西部五街镇以南的鸡子地,西南流至一街乡大雪地村转西北流,经一街乡治,于南华与祥云县交界处转西南流,至罗武庄乡西北起成为南华与弥渡县界河,向南一直到红土坡镇山尾村西北转东南流,最后于南华红土坡镇西南汇入礼社将。河流全长57.2公里,流域面积1097平方公里,平均比降14.8‰。年均流量2.8亿立方米。河道两岸属于干热河谷地区,森林植被破坏严重,水土流失较严重,易发生泥石流灾害。[1]
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