Range

Range of Salmon in the PNW
 

In the PNW, salmon range from the coast of Alaska to its southern limit of San Francisco Bay, California. Several species migrate as far inland as far as Montana and Idaho.

Maps of critical PNW salmon habitats that including Washington, Oregon, Montana and parts of Idaho.    Source: NOAA Special Project

However, as far as this range seems to encompass, according to a 1996 report by the National Research Council (U.S.) Committee on Protection and Management of PNW Anadromous Salmonids, over the past century salmon have disappeared from over 40% of their historical range in California, Washington, Oregon and Idaho*.

 

Salmon hatcheries and sea cages are across the globe as well. 

References:

*National Research Council (U.S.). Committee on Protection and Management of Pacific Northwest Anadromous Salmonids