Arrowrock Spillway, looking south, Boise River

Some Notes on Arrowrock Dam


Arrowrock Dam is one of three major dams along the course of the Boise River. It’s the oldest of the three, completed in 1915. At 348 feet tall, Arrowrock was the highest dam in the world at the time. It’s primary purpose is irrigation; it holds the winter’s rain and snowmelt so that water is…