Abstract
In 1987 the Government of Canada, the Province of British Columbia, and Alcan Aluminum Ltd. entered into a tripartite agreement establishing a program of measures to conserve chinook (Oncorhynchus tshawytscha) and sockeye (Oncorhynchus nerka) salmon stocks in the Nechako River. Large-scale applications of habitat measures are planned to manage the risks caused to chinook salmon by potential reductions in habitat quality associated with the reduction of flows. The reduction of flows result from the planned diversion of an additional portion of the upper Nechako River drainage. Experimental placements of debris structures and channel modifications were conducted from 1988 to 1993. Juvenile chinook salmon highly colonized debris structures, particularly the sweepers and rail-debris catchers installed in 1991, and fry density was similar to sparse natural debris cover. Channel modifications, point bars, and a side channel were durable, but were not as well utilized by young chinook. Physical assessment indicated that durability was medium to high where debris catchers and bundles withstood peak flows of 250--283 m{sup 3}/s.
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