Annual estimates of the abundance of naturally-produced spawners.
The Lower Columbia River Coho ESU includes all populations of coho salmon in the Columbia River and its tributaries in Washington and Oregon, from the mouth of the Columbia up to and including the Big White Salmon and Hood Rivers. It also includes the Willamette River to Willamette Falls.
The State of Oregon only monitors populations occurring in Oregon. There are eight recognized populations of coho in the Lower Columbia ESU, all of which are considered to be functionally independent. Lower Columbia coho were listed as threatened on June 28, 2005.
Oncorhynchus kisutch
Annual estimates of the abundance of naturally-produced spawners.