The purpose of this study was to investigate the population dynamics of juvenile steelhead trout (Salmo gairdneri Richardson) in an artificial freshwater impoundment of 13.3 hectares situated in Western Oregon. Data were collected from May 1962 until May 1963. The specific objectives of the investigation were (a) to determine the limnological characteristics of the pond, and (b) to make a detailed study of the dynamics of survival, growth, and production of the fish population. In the study of fish population dynamics, data were obtained on population size, growth and mortality rates, net production, and total yield. The feeding habits of the fish were studied and related to the standing crop estimates of the available food organisms. The concept of rearing fingerling steelhead trout and Pacific salmon (Oncorhynchus spp.) in controlled impoundments is relatively new. It originated a few years ago in the northwestern regions of the United States as a reaction against the increasing civilization pressure on the natural areas suitable for salmonid production. Fresh and saltwater areas were set aside for producing smolts in one-year cycles.