Salmon Creek Dam, Concrete arch dam in Juneau, United States.

Salmon Creek Dam is a concrete arch structure in Juneau that spans a river valley and holds back water in a large reservoir. The structure powers the city through hydroelectric generation and supplies drinking water to the community.

The dam was built in 1914 for a mining company operating in the area and represented a breakthrough in engineering design. Its innovative arch approach later became a model that many other dam projects adopted.

The dam's name comes from Salmon Creek, which it impounds; the reservoir and creek remain a drinking-water source for Juneau and support aquaculture and fishing. The Alaska-Gastineau Mining Company built it for its mines at Sheep Creek, and the concrete arch has stood since 1914.

The dam and surrounding area are accessible for visitors who want to see the valley and landscape. Bring sturdy footwear and be prepared for Alaska's variable weather, as conditions can shift quickly between clear and rainy.

Salmon Creek Dam was the world's first constant-angle, variable-radius arch dam; its central opening angle is 113°, with the arch radius growing from 147.5 feet at the base to 331 feet at the crest. The design cut construction costs by 20% through reduced concrete use, and the American Society of Civil Engineers named it a National Historic Civil Engineering Landmark in 2022.