The Shimen Dam is a large concrete gravity dam located in the Shimen District of Taipei City, Taiwan. Completed in 1992, it primarily serves to provide water supply, flood control, and hydroelectric power generation. The dam is built on the Dahan River, which is a significant water source for the surrounding areas. The dam creates the Shimen Reservoir, which is a popular recreational area for activities like fishing and hiking. The reservoir also plays a crucial role in irrigation for local agriculture, supporting the region's economy. Its scenic surroundings make it a favored spot for both locals and tourists.