Data from: An integrated population model for estimating the relative effects of natural and anthropogenic factors on a threatened population of steelhead trout

This collection includes data on the abundance, age composition, and harvest of adult steelhead trout, as well as the numbers of juveniles released from a hatchery, for steelhead trout (<em>Oncorhyncus mykiss</em>) from the Skagit River in Washington, USA. It also includes estimates of the marine survival of hatchery-origin steelhead.