A key streams program was initiated in 1984 by the Department of Fisheries and Oceans to monitor the success of management actions in several important chinook producing streams throughout British Columbia. The objectives of the key streams program are: 1) to accurately estimate wild escapement on key streams; 2) to estimate harvest rates, and contributions to fisheries and escapement, based on an analysis of coded wire tagged (CWT) and adipose clipped returns, including estimates of the total escapement of CWTs to the key stream system; and 3) to estimate contribution of hatchery production to the total key stream escapement.