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铜街子水电站位于四川省乐山市新华乡境内,系大渡河梯级中最末一级,坝址距上游已建成的龚嘴水电站33 km. 大渡河多年平均流量为1500 m~3/s,迳流平稳,年际、年内变化小,历年实测最大流量为10800m~3/s,最小流量为342m~3/s.坝址位于大渡河高山峡谷到丘陵的过渡地带,河谷宽约400 m,左岸岩坡平缓,右岸岸坡较陡,两岸基岩裸露、冲沟发育,地形欠完整.
Tongjiezi Hydropower Station is located in the territory of Xinhua Township, Leshan City, Sichuan Province, and is the last of the Dadu River cascade, with a dam site of 33 km from Gongzui Hydropower Station, which has been built up to the upstream. The average annual flow of Dadu River is 1500 m 3 / s, The flow is stable, interannual, and has little change during the year. The maximum measured flow over the years is 10800m ~ 3 / s and the minimum flow is 342m ~ 3 / s. The dam site is located in the transition zone between the alpine valley and the hills in Dadu River. The rock slope is gentle, the bank slope on the right bank is steep, the bedrock on both sides of the bank is exposed, the gully is developed and the terrain is not complete.