Technical Report

Habitat improvement to enhance anadromous fish production [Clear Creek]

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  • Clear Creek, tributary of North Fork John Day River, is a mountain stream located in the Blue Mountains of eastern Oregon. It joins Granite Creek about 1.5 miles below the old abandoned mining town of Granite. Gravel removed from Clear Creek by gold dredging activity was replaced in a 3.37-mile section of the stream in 1961. The purpose of this work was to provide new spawning areas and resting pools to accommodate adult spring chinook salmon. A total of 123 hours was required to move an estimated 13,158 cubic yards of gravel into the channel. The cost was $1,470 or 11¢ per cubic yard. Physical stream surveys indicated that a considerable amount of the introduced gravel washed from the areas of introduction but in most cases was still usable. Log barriers worked satisfactorily as a means of stabilizing the gravel. At the peak of the spawning period each year, observations were conducted to determine the amount of spring chinook activity on the introduced and natural gravels of the stream. These observations indicated that the run of salmon increased during the study period. One chinook redd was examined periodically to determine the rate of development and approximate time of fry emergence from the gravel. The young salmon remained in the gravel for eight months before emerging. The slow rate of development is attributed to low temperatures during the winter months. A limited number of intragravel dissolved oxygen samples were also taken during the time of egg development. The dissolved oxygen content was satisfactory for egg and fry development.
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  • 14-17-0001-1014
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