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Draft Coast Fork Willamette River, Oregon: Surplus Water Letter Report

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Draft Coast Fork Willamette River, Oregon: Surplus Water Letter Report Coast Fork Willamette River, Oregon Surplus Water Letter Report December 18, 2013 Final Draft Surplus Water Letter Report Coast Fork Willamette River Surplus Water Letter Report EXECUTIVE SUMMARY The City of Creswell (City), a small bedroom community in Lane County, Oregon, has expressed an interest in purchasing surplus storage for water supply to support municipal and industrial needs from the U.S. Army Corps of Engineers (Corps). The City requested water from Dorena and Cottage Grove Reservoirs, both of which are operated as part of the Willamette Valley Project, a system of 11 dams and reservoirs and 2 reregulating dams located in the Willamette River Basin, Oregon. To meet the immediate needs of the City of Creswell, the Corps initiated a general investigation study in the Coast Fork Willamette River sub-basin. The Oregon Water Resources Department acted as the non- federal, cost-share sponsor for this study. The purpose of the study was to identify whether a quantity of joint-use storage, up to 437 acre-feet, is available as surplus for municipal and industrial (M&I) use. A major outcome of the study was determining the price charged to municipal and industrial entities for Willamette Valley Project storage space. This report, titled Coast Fork Willamette River, Oregon Surplus Water Letter Report, outlines the study purpose and authority, including a description of the study’s relationship to the Willamette Basin Review Feasibility Study, which was placed on hold in 2000 to allow for Endangered Species Act consultation among federal agencies. The City of Creswell’s water supply needs and potential alternatives are also discussed in this report. Of those alternatives, using surplus conservation storage from the Willamette Valley Project, specifically Dorena and Cottage Grove Reservoirs, is the most efficient water supply alternative for meeting the City of Creswell’s immediate water needs. The Willamette River Basin was modeled using the Hydrologic Engineering Center (HEC) Reservoir System Simulation Program (ResSim) to assess the individual project and system effects of the proposed action. The authorized project purposes of the Willamette Valley Project, including impacts from the proposed action, were examined as part of the study and are detailed in this report. The small amount of water released from the project reservoirs is not expected to measurably impact the authorized purposes, namely flood damage reduction, navigation/flow augmentation, hydropower, fish and wildlife, water quality, irrigation, municipal and industrial water supply, and recreation. Other considerations, such as the financial feasibility of purchasing storage, environmental aspects, and dam safety considerations were also examined as part of this study. The ResSim Program was also used to analyze the system-wide impacts of using stored water from all eleven Willamette storage projects to meet projected M&I basin-wide demands in the future. The results from this analysis were used in the cost analysis to determine the price structure for reallocated and surplus storage in the Willamette Project. A discussion of the modeling results and the calculations to determine user costs are detailed in the appendices. The report closes with steps needed for implementation, findings of the study, and recommendations from the District Engineer. Final Draft December 2013 ES-1 Coast Fork Willamette River Surplus Water Letter Report TABLE OF CONTENTS EXECUTIVE SUMMARY ACRONYMS, ABBREVIATIONS AND GLOASSARY LIST OF FIGURES AND TABLES 1 INTRODUCTION ............................................................................................................................ 1-1 1.1 STUDY PURPOSE ......................................................................................................................... 1-1 1.2 STUDY AUTHORITY .................................................................................................................... 1-1 1.3 STUDY BACKGROUND ................................................................................................................ 1-1 2 PROJECT BACKGROUND ........................................................................................................... 2-1 2.1 PROJECTS AUTHORIZATION ....................................................................................................... 2-1 2.2 WILLAMETTE SYSTEM RESERVOIR OPERATION ........................................................................ 2-1 2.3 COAST FORK WILLAMETTE SUBBASIN ...................................................................................... 2-1 2.3.1 Reservoir Descriptions ....................................................................................................... 2-1 2.4 AUTHORIZED PROJECT PURPOSES (EXISTING CONDITIONS) ..................................................... 2-2 2.4.1 Flood Damage Reduction ................................................................................................... 2-2 2.4.2 Hydropower ....................................................................................................................... 2-3 2.4.3 Fish and Wildlife ................................................................................................................ 2-3 2.4.4 Irrigation ............................................................................................................................ 2-4 2.4.5 Municipal and Industrial Water Supply ............................................................................. 2-5 2.4.6 Navigation .......................................................................................................................... 2-5 2.4.7 Recreation .......................................................................................................................... 2-5 2.4.8 Water Quality ..................................................................................................................... 2-6 2.5 OREGON WATER LAW ................................................................................................................ 2-6 2.5.1 The Water Code ................................................................................................................. 2-6 2.5.2 Prior Appropriation ............................................................................................................ 2-6 2.5.3 Obtaining New Water Rights ............................................................................................. 2-7 2.6 CORPS OF ENGINEERS EASEMENTS AND PERMITS ..................................................................... 2-7 2.6.1 Easements .......................................................................................................................... 2-7 2.6.2 Regulatory Permits ............................................................................................................. 2-8 2.6.3 Existing and Pending Agreements, Easements, and Permits ............................................. 2-8 2.7 CURRENT WATER USE ............................................................................................................... 2-8 3 PLAN FORMULATION ................................................................................................................. 3-1 3.1 NEED FOR WATER ...................................................................................................................... 3-1 3.2 WATER SUPPLY DEMAND ANALYSIS ......................................................................................... 3-1 3.2.1 Water Supply Demand: Existing Water Users ................................................................... 3-1 3.2.2 Total M&I Water Demand in the Study Area .................................................................... 3-2 3.2.3 City of Creswell Water Supply .......................................................................................... 3-2 3.3 ALTERNATIVES .......................................................................................................................... 3-4 3.3.1 Natural Flow ...................................................................................................................... 3-4 3.3.2 Purchase Water from Another Municipal Entity ............................................................... 3-4 3.3.3 Groundwater ...................................................................................................................... 3-5 3.3.4 Conservation ...................................................................................................................... 3-5 3.3.5 Surplus Water from Federal Storage .................................................................................. 3-5 3.4 ALTERNATIVES STUDIED IN DETAIL .......................................................................................... 3-5 3.4.1 No Action Alternatives ...................................................................................................... 3-5 3.4.2 Proposed Action – Surplus Agreement .............................................................................. 3-6 i Final Draft December 2013 Coast Fork Willamette River Surplus Water Letter Report 4 IMPACTS TO AUTHORIZED PURPOSES ................................................................................ 4-1 4.1.1 Flood Damage Reduction ................................................................................................... 4-1 4.1.2 Navigation and Flow Augmentation .................................................................................
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