 The dam on Butt Creek, a tributary of the North Fork Feather River located south of Lake Almanor, was completed in 1924.The high, long dam forms a reservoir of which serves as an afterbay for the Butt Valley Powerhouse.Water from Butt Creek as well as North Fork water diverted through the Butt Valley Powerhouse is fed through tunnels from Butt Valley Reservoir to two powerhouses on the North Fork near Caribou.