北川河,位于中华人民共和国青海省东北部的一条河流,为湟水左岸支流,上游称宝库河,发源于大通回族土族自治县西北达坂山西段的开甫托山,自西北向东南贯穿大通县境,于廿里铺镇上孙家寨村流入西宁市城北区,向南流经西宁市区,过祁连路北川河桥后汇入湟水。河长154.2千米,流域面积3371平方千米,河道平均比降14.6‰。年均径流量6.57亿立方米。[1]

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大通县城河段

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