The most common fish in City Creek Canyon is the Bonneville Cutthroat trout. The Rainbow Trout is the next most abundant fish. Brown Trout is found in the lower part of the canyon. These trout were introduced in the late 1800's and have managed to push the native Bonneville Cutthroat trout out of some of its territory. Hybridization of the Bonneville Cutthroat trout with the introduced rainbow trout can be found throughout the area. There has also been hybridization of the Bonneville Cutthroat trout with the introduced Yellowstone cutthroat trout. Only a few isolated protected populations of pure genetic strains of Bonneville Cutthroat trout are known in the Wasatch. City Creek is not one of them.

Other fish that were once present in City Creek, but have long since disappeared, are the Artic Grayling and the Brook Trout. These fish were introduced around the same time as the Brown Trout, but for reasons unknown, have disappeared (Potts 2001).

The importance of trout as an indicator species for the environment is typically underestimated. They are an important component of the ecological system of City Creek. Unfortunately, fish's needs are often pushed aside in order for industrialization, residential, and economical growth.

The whole City Creek watershed is now being managed as a protected nature preserve by Salt Lake City Municipal Water Department as well as a watershed for drinking water. Policy issues regarding the reestablishment of native Cutthroat trout populations needs to be considered. Similarly the presence of beavers on the watershed and their role in watershed protection and ecological restoration needs to be examined. The roles of floods and fires as natural and normal ecological disturbances need to be acknowledged as a part of City Creeks natural area protection program.

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