North Fork Dam | |
Name origin: Named for the North Fork of the Clackamas, which flows into North Fork Reservoir behind it. | |
Country | United States |
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State | Oregon |
County | Clackamas |
Coordinates | 45°14′36″N 122°16′47″W / 45.24333°N 122.27972°WCoordinates: 45°14′36″N 122°16′47″W / 45.24333°N 122.27972°W |
The North Fork Dam is on the Clackamas River, about five miles upriver from Estacada, Oregon. It was built in 1958. The North Fork Reservoir is behind it.
It is a concrete arched dam, 206 feet high and 676 feet long, is thin-shell of variable thickness. It varies in thickness from 32 feet at the base to 8 feet wide at the top.
North Fork's construction entailed the building of the 1.9-mile-long North Fork Fish Ladder, one of the longest in the world. It also required a complex system to provide for downstream fish passage around the dam.