Got an e-mail from Save Our Wild Salmon today with a pretty amazing video.

Most of us have heard about the unbelievable journey that many salmon take to return to their spawning grounds. These native salmon travel from the ocean to the same river where they hatched. On the way, they have quite a bit to overcome.

Some of the obstacles blocking the return of salmon are man made. Massive dams on the Columbia and Snake Rivers and dozens of dams on tributary streams change the migration routes for salmon in astonishing ways. These fish also have to swim through polluted streams and past gill-nets.

Other obstacles are natural. Check out the video after the jump.

This is Dagger Falls on the Middle Fork of the Salmon River in Idaho. The videography is by Skip Armstrong. Unreal.

A 700-mile swim isn't for the faint of heart. Check out the path that these salmon had to take in the map below.

View Dagger Falls in a larger map