For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov/ or call 1-888-ASK-USGS (1-888-275-8747).For an overview of USGS information products, including maps, imagery, and publications, visit http://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Holmquist-Johnson, Chris; Hanson, Leanne; Daniels, Joan; Talbert, Colin; and Haegele, Jeanette, 2016, Development of a decision support tool for water and resource management using biotic, abiotic, and hydrological assessments of Topock Marsh, Arizona: U.S. Geological Survey Open-File Report 2016-1065, 121 p., http://dx.doi.org/10.3133/ofr20161065. ISSN 2331ISSN -1258 iii AcknowledgmentsWe would like to thank the U.S. Geological Survey (USGS) for their base support for this project, Doug Andersen, USGS, for his valuable advice throughout the project, and James Roberts, USGS, for his assistance in the editing of this document.We would also like to thank the Bureau of Reclamation Technical Service Center (TSC) in Denver, Colorado, for their support in this project; the U.S. Fish and Wildlife Service (FWS)-Region 2, for funding the work reported herein, particularly Andrew Hautzinger for his continued support and patience; the Havasu National Wildlife Refuge (Havasu NWR) staff plus Mitch Thorson and Rob Randall, Arizona Fish and Wildlife Conservation Office (AZFWCO), and their respective staffs who helped us fulfill this task in so many ways; Janet Kirsch, Chris Pope, Chris Dodge, Barbara Raulston, and Joe Kahl, Bureau of Reclamation, Lower Colorado Region; Rick Wydoski and Eric Best, Reclamation, TSC; C. Doug Adams, Bureau of Land Management; and Gregg Cummins, Arizona Game and Fish Department, for sharing their data and knowledge; plus Joaquin Baca, FWS-Region 2, for his assistance in the editing of this document. A special thanks to volunteer Marge Penton for her invaluable assistance in the field as well as the Havasu NWR Student Conservation Association whose students provided assistance with numerous data collection efforts. Without everyone's involvement and assistance, this work could not have been performed. AbstractTopock Marsh is a large wetland adjacent to the Colorado River and the main feature of Havasu National Wildlife Refuge (Havasu NWR) in southern Arizona. In 2010, the U.S. Fish and Wildlife Service (FWS) and Bureau of Reclamation began a project to improve water management capabilities at Topock Marsh and protect habitats and species. Initial construction required a drawdown, which caused below-average inflows and water depths in 2010-11. U.S. Geological Survey Fort Collins Science Center (FORT)...
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