Copco 1 Dam Site (Removed in 2024)

The Copco 1 Dam was completed in 1918 (and raised higher in 1922). It was a 120' high concrete gravity dam. The dam began blocking anadromous fish passage around 1911 during its construction. The dam was breached with the blasting of a tunnel at the base of the dam on January 23, 2024 and fully removed by August of 2024. All that remains now are light colored bands of concrete on the canyon walls marking where the dam once spanned the river and, on river right, some log cribs just upstream that were the foundation of the cofferdam used to divert the river during dam construction.