North Fork of the Koyukuk River
NPS Photograph Teri McMillan
The North Fork of the Koyukuk flows from the south flank on the Arctic Divide through broad, glacially carved valleys in the rugged Endicott Mountains of the Central Brooks Range. It passes between Boreal Mountain and Frigid Crags dubbed the "Gates to the Arctic" by Bob Marshall. The North Fork joins the Middle Fork and can be run all the way to Bettles Field.
Did You Know?
Chert is a fine-grained rock used by the prehistoric inhabitants of the Brooks Range to create tools like scrapers, knives and spear points. The Brooks Range contains one of the richest deposits of "tool quality" chert in the world.