Abstract
Abstract Dam removal or breaching (partial removal) is an increasingly common remedy for fish passage, habitat degradation, water quality, and other problems caused by dams in the United States. The Jackson Street Dam, built in 1960 on Bear Creek in Medford, Oregon, resulted in a barrier to migration of Pacific salmon Oncorhynchus spp. and steelhead O. mykiss, loss of stream habitat, eutrophication, and an algae-choked impoundment in downtown Medford. The 11-ft-high concrete and wooden structure was owned and operated by the Rogue River Valley Irrigation District as one of its primary diversions. The dam was breached in 1998, culminating a 13-year, US$1.2 million effort led by the Rogue Valley Council of Governments and the Medford Urban Renewal Agency in collaboration with the irrigation district, other government agencies, and local citizens. Breaching reduced the dam to a series of three concrete steps dropping 1 ft each, thereby providing fish passage and restoring a free-flowing stream within the for...
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