Salmon & Steelhead Recovery Tracker

Middle Fork Willamette River (Independent Population)

Middle Fork Willamette River Independent Population

Oncorhynchus tshawytscha

Abundance

Annual estimates of the abundance of naturally-produced spawners for each Upper Willamette River population.

Abundance estimates are only currently available for McKenzie River Spring Chinook.

Spawning Year Wild Adult Count Nat. Origin Spawners 95% Confidence Interval Abundance Goal Average Abundance

Average Abundance

Spawning Year Average Abundance Avg. of Ab.Goal

Hatchery Proportion

The proportion of spawning fish that are of hatchery origin in each Upper Willamette River population.

Hatchery proportions are only currently available for McKenzie River Spring Chinook.

Spawning Year Whole Basin Proportion Hatchery Below Dam Proportion Hatchery

Average Hatchery Proportion

Spawning Year Whole Basin Proportion Hatchery 9-yr. pHOS Avg. WB Whole Basin pHOS Limit Below Dam Proportion Hatchery 9-yr. pHOS Avg. BD Below Dam pHOS Limit