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sn974 -, n, <br />REPORT DOCUMENTATION ].REPORT NO. 2. 3. Recipient's Accession No. <br />PAGE FWS/OBS-80 13 <br />4. Title and Subtitle Effects of Al terations to Low Gradient Reaches 5. Report Date <br />of Utah Streams: Summary April 1980 <br /> 6. <br />7. Author(s) 8. Performing Organization Rept. No. <br />Richard S. W d k' and William T. Helm <br />9. Performing Organization Name and Address 10. Project/Task/Work Unit No. <br />Utah Cooperative Fishery Research Unit <br />Department of Wildlife Science 11. Contract(C) or Grant(G) No.' <br />Utah State University (c) 14-16-008-1141 <br />Logan, Utah 84322 (G) <br />12.,Sponsoring Organization Name and Address 13. Type of Report & Period Covered <br />Eastern Energy and Land Use Team <br />Office of Biological Services, U. S. Department of the Interior Final Report <br />Route 3, Box 44 <br />Kearneysville, WV 25430 14. <br />15. Supplementary Notes <br />-I& Abstract (Limit: 200 words) <br />Stream channels in the semi-arid intermountain west have been modified for many years by <br />agricultural interests, primarily to provide flood-protection. Little information has <br />been available on the long-term physical and biological consequences of channel modifi- <br />cation in this geographic region. Of special concern is the relationship between stream <br />channel modification and the high value fishery resource. This report describes an <br />investigation of the effects of stream channelization on fish and macroinvertebrates <br />in low gradient reaches of Blacksmith Fork River and the Logan River in the floodplain <br />of Cache Valley in northern Utah. Channelization adversely affected both fish and macro- <br />invertebrate populations and biomass, with the severity of impact directly related to <br />the amount and duration of disturbance of the physical habitat. <br />17. Document Analysis a. Descriptors <br />Fisheries, Stream Improvement, Streambeds, Dredging, Freshwater Fish, Fish Populations, <br />Aquatic Environment, Fish Food Organisms, Invertebrates, Channel Morphology <br />b. Identifiers/Open-Ended Terms <br />Channelization, Brown trout, Mountain Whitefish, Logan River, Blacksmith Fork River, <br />Cache Valley, Utah, Trout <br />c. COSATI Field/Group 57H, 57Z, 48B <br />1& Availability Statement 19. Security Class (This Report) 21. No. of Pages <br />Release unlimited inclaggifiAd 7+covers <br /> 20. Security Class (This Page) 22. Price <br /> unclassified <br />lsee ANSI-239.1 a) <br />13 <br />OPTIONAL FORM 272 (4-77) <br />(Formerly NTIS-35) <br />Department of Commerce <br />U.S. GOVERNMENT PRINTING OFFICE : 1980 0 - 328-608