Assessment and Classification of Matanuska-Susitna Fish Habitat— Stream Water Temperature Cottonwood Creek at Edlund Road 24 22 20 18 16 14 12 10 8 Temperature (C) Temperature 6 4 Max Min Ave 2 0 6/1/2007 6/21/2007 7/11/2007 7/31/2007 8/20/2007 9/9/2007 9/29/2007 Jeffrey C. Davis and Gay A. Davis The Aquatic Restoration and Research Institute P.O. Box 923, Talkeetna AK, 99676
[email protected] 907.733.5432 January 2008 Acknowledgments Funding for this project was provided through the National Fish Habitat Initiative Mat-Su Salmon Partnership, and by the State of Alaska Department of Environmental Conservation and the Alaska Clean Water Actions program. We appreciate the support provided by the project managers, Laura Eldred and John DeLapp. We appreciate discussions and assistance provided by Sue Mauger of Cook Inlet Keeper. ARRI January 2008 Habitat Classification—Temperature Abstract Stream water temperatures influence most chemical and biological processes in stream ecosystems. However, we have limited water temperature data for streams within Southcentral Alaska. Recent data have shown that stream water temperatures within the Cook Inlet Ecoregion often exceed State Water Quality Standards and approach tolerance values for anadromous salmon. Stream water temperatures vary with regional climate, elevation, vegetation cover, channel shape, ground water input, and other physical features, which differ widely among streams within Cook Inlet. We summarized stream water temperature data collected through a number of different projects within the Matanuska-Susitna Borough from 2001 to 2007 and evaluated the range of stream temperatures, the factors influencing variability, and the relationship to State Water Quality Standards.