The North Fork Dam is on the

Clackamas River The Clackamas River is an approximately tributary of the Willamette River in northwestern Oregon, in the United States. Draining an area of about , the Clackamas flows through mostly forested and rugged mountainous terrain in its upper reaches, a ...

, about five miles upriver from

Estacada, Oregon Estacada is a city in Clackamas County, Oregon, Clackamas County, Oregon, United States, about southeast of Portland, Oregon, Portland. The population was 4,356 at the 2020 United States census, 2020 census, and was estimated to be 5,421 in 20 ...

. It was built in 1958. The North Fork Reservoir is behind it.

Construction

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.

The fish ladder

North Fork's construction entailed the building of the long North Fork

Fish Ladder A fish ladder, also known as a fishway, fish pass, fish steps, or fish cannon, is a structure on or around artificial and natural barriers (such as dams, locks and waterfalls) to facilitate diadromous fishes' natural migration as well as mov ...

, one of the longest in the world. It also required a complex system to provide for downstream fish passage around the dam.

References

External links

North Fork Reservoir Additional Information - Oregon State Marine Board

A map

Helping Fish Find Their Way Up The Clackamas

The elevation, latitude and longitude
Dams in Oregon 1958 establishments in Oregon Dams with fish ladders {{clackamasCountyOR-geo-stub