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, high and long, is thin-shell of variable thickness. It varies in thickness from at the base to wide at the top.
North Fork's construction entailed the building of the 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.