Built 124 years ago in 1901 to generate power, Swan Falls is the oldest hydroelectric dam on the Snake River.

Strike Dam, built upriver from Swan Falls in the early 1950s, was not equipped with fish passage facilities.

Thus, the two dams combined to become the first artificial barrier to anadromous fish migration up the Snake River.

Today, Hells Canyon Dam (1967) is the first total barrier to fish migration on the Snake.

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