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Executive Summary

Crook County Reservoirs and Water Management Study ? Level I

Submitted to:

Wyoming Water Development Commission

Cheyenne, Wyoming

Submitted by: Short Elliott Hendrickson Inc.

Cheyenne, Wyoming Fort Collins, Colorado

In association with: Anderson Consulting Engineers, Inc.

Fort Collins, Colorado Watts and Associates, Inc.

Laramie, Wyoming Office of the Wyoming State Archaeologist

Cheyenne, Wyoming

February 23, 2006

Crook County Reservoirs and Water Management Study - Levell

SEH No. A-WWDC0040S.00 February 23, 2006

I hereby certify that this report was prepared by me or under my direct supervision, and that I am a uly Licensed Professional Engineer under the laws of the State of Wi mingo

Douglas M. Yadon,

Date:

Zh?/c6

/7

Reg. No.: _ _---=P-=E=---4.:..;:6=5..:::..0_ _

Short Elliott Hendrickson Inc. 7000 Yellowtail Road, Suite 230 Cheyenne, Wyoming 82009 307.633.6440

2637 Midpoint Drive, Suite F Fort Collins, CO 80525-4415 970.484.3611

February 23, 2006

Certification Page Table of Contents

Table of Contents

1.0 Purpose and Scope ...................................................................................................1

2.0 Summary of Findings ................................................................................................1 2.1 System Efficiencies and Conservation Opportunities .........................................1 2.2 Needs Analysis and Demand Projections ...........................................................2 2.3 Hydrologic/Water Rights Analysis .......................................................................2 2.4 Field Investigations .............................................................................................3 2.5 Storage Site Screening .......................................................................................3 2.6 Alternatives Analysis...........................................................................................3 2.7 Permitting/Environmental Constraints And Mitigation .........................................5

3.0 Project Configurations and Costs............................................................................6 3.1 Conceptual Designs And Cost Estimates ...........................................................6 3.2 Economic Analysis and Project Financing ..........................................................8

Table ES-1 Table ES-2 Table ES-3 Table ES-4

List of Tables

Supply and Needs Summary Alternative Dams and Reservoirs Summary Detailed Alternative Cost Estimates Economic Analysis and Project Financing Summary

Figure ES-1 Figure ES-2 Figure ES-3

List of Figures

Location Map Supply and Existing Needs Summary Alternative Concepts/Sites Recommended for Advancement to Phase II

Crook County Reservoirs and Water Management Study ? Level I Wyoming Water Development Commission

A-WWDC00405.00 Page ES-i

February 23, 2006

Executive Summary

Crook County Reservoirs and Water Management Study ? Level I

Prepared for Wyoming Water Development Commission

1.0 Purpose and Scope

The primary purposes of the Crook County Reservoirs and Water Management Level I study are to assess the current and potential future needs for water in the Belle Fourche River Basin below Keyhole Dam (and the Redwater Creek Basin) and evaluate alternative concepts/sites for new storage to meet some or all of those needs. The location of the study area is shown on Figure ES-1.

The scope of this study is fully responsive to the Scope of Services in Exhibit "A" of the Consultant Contract for Services. The study was performed in two major phases. Phase I involved the following primary tasks: assessment of the potential for enhanced conservation and water management in the study area; identification and quantification of existing and potential future water needs; and identification, characterization, and screening of alternative storage concepts/sites to meet the identified needs. Selected alternative storage concepts/sites identified in Phase I were then evaluated in more detail in Phase II, including preparation of conceptual designs and order-of-magnitude cost estimates. Phase II also included evaluation of permitting/environmental constraints and mitigation associated with the proposed alternatives, and performing economic analyses and assessing project financing options.

2.0 Summary of Findings

The following subsections present the key findings of the Phase I and Phase II studies undertaken in this Level I study. More detail on any of the findings discussed here can be found in the corresponding named main sections in the Final Report. Note that the organization of this Executive Summary is modified somewhat from the Final Report where appropriate for clarity.

2.1 System Efficiencies and Conservation Opportunities

Conveyance and Diversion. Diversions on the Belle Fourche River main stem are typically made by pumping adjacent to the ground to be irrigated, using the river as the primary conveyance of either direct flows or releases from storage in Keyhole Reservoir. Previous studies have approximated losses in the Belle Fourche River to the state line of water called from storage in Keyhole Reservoir at approximately 50 percent in dry conditions and 40 percent in a wet year.

Crook County Reservoirs and Water Management Study ? Level I Wyoming Water Development Commission

A-WWDC00405.00 Page ES-1

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