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Download This Document As A This is a digital document from the collections of the Wyoming Water Resources Data System (WRDS) Library. For additional information about this document and the document conversion process, please contact WRDS at [email protected] and include the phrase “Digital Documents” in your subject heading. To view other documents please visit the WRDS Library online at: http://library.wrds.uwyo.edu Mailing Address: Water Resources Data System University of Wyoming, Dept 3943 1000 E University Avenue Laramie, WY 82071 Physical Address: Wyoming Hall, Room 249 University of Wyoming Laramie, WY 82071 Phone: (307) 766-6651 Fax: (307) 766-3785 Funding for WRDS and the creation of this electronic document was provided by the Wyoming Water Development Commission (http://wwdc.state.wy.us) IRON CREEK PROJECT LEVEL II FEASIBILITY STUDY INTERIM REPO T TO SHOSHONE AND HEART MOUNT AI IRRIGATION DISTRICTS AND WYOMING WATER DEVELOPMENT COMMISSION BY HARZA ENGINEERING COMPANY ENGLEWOOD, COLORADO DECEMBER 1982 ENGINEERING COMPANY CONSULTING ENGINEERS December 7, 1982 Shoshone and Heart Mountain Irrigation Districts 337 East 1st Street Powell, Wyoming 82435 Subject: Iron Creek Level II Feasibility Study Interim Report Gentlemen: We are pleased to present our Interim Report on the Iron Creek Project, prepared in accordance with our contract dated September 28, 1982. Objective The studies described in this report are the first phase of the Iron Creek Level II Feasibility Study_ They were undertaken to compare two alternatives that would provide for continued diversion of irrigation water to the Garland and Frannie Di­ visions of the Shoshone Project in a reliable, cost effective manner. The alternatives are: 1. Rehabilitating the existing Corbett Darn, Tunnel, and associated works, to provide for continued reliable operation, and 2. Constructing a new diversion dam across the Shoshone River at Iron Creek and retiring Corbett Tunnel and perhaps Corbett Dam. Hydroelectric installations, which could generate revenues to partly offset construction costs, were evaluated for both al­ ternatives. The second phase of the Iron Creek Study will be a feasibility study of the selected alternative. Background Water for irrigation of more than 50,000 acres in the Gar­ land and Frannie Divisions of the Shoshone Project is diverted from the Shoshone River at Corbett Dam, located about six miles northeast of Cody_ Irrigation flow enters the 3.3-mile-long Corbett Tunnel through an intake immediately above the dam on the left bank. The tunnel discharges to a settling pool formed 150 SOUTH WACKER DRIVE CHICAGO, ILLINOIS 60606 TEL (312) 855-7000 CABLE: HARZENG CHICAGO TELEX 25-3540 Shoshone and Heart Mountain Irrigation Districts Page 2 by a dam across Iron Creek, a tributary of the Shoshone River. Garland Canal (which also feeds the Frannie Canal) begins at a headworks structure on the north bank of this pool. The Corbett Dam and Tunnel diversion system was placed into service in 1908, and only minor repairs and improvements have been made in the 74 years since then. The Irrigation District has expressed concern over the continued serviceability and reliability of the tunnel, given its age. Tunnel failure could result in loss of irrigation water in the Garland and Frannie Divisions for an extended period of time. Therefore, a study of methods to extend the service life of the existing dam and tun­ nel, and a comparison of the costs of dam and tunnel rehabilita­ tion with the costs of building a new diversion dam to supply water directly to the Garland Canal, was undertaken. Scope The study of the existing facilities, including Corbett Dam and Tunnel, included a review of construction records and pre­ vious reports and evaluations~ a field inspection to determine the existing condition of the dam, tunnel, and appurtenant works~ and evaluation of this information to develop repair and rehabilitation needs, methods, and costs. The location, layout, and cost of the proposed replacement diversion dam, located near the mouth of Iron Creek, were drawn from a preliminary report by Tudor Engineering Company and from a site reconnaissance and limited review made during ~lis study. Hydroelectric power plant arrangements and estimates of costs and benefits were also developed, and any net henefits were used in cost comparisons to defray part of project construction cost. More detailed studies of the selected alternative are to be conducted during later phases of work. Results A reliable diversion of irrigation water can be assurred either by rehabiliting the existing system or by constructing a new dam. Shoshone and Heart Mountain Irrigation Districts Page 3 Rehabilitation Alternative The rehabilitation measures recommended for the existing system include: 1. At Corbett Dam, repairing sluice gate seats, constructing a training wall to improve sediment deflection, and installing a trashboom; 2. In Corbett Tunnel, grouting, constructing new drains in the invert and in sidewalls where leakage is serious, relining the tunnel with fibrous shotcrete, and resurfacing the tunnel invert: and 3. At the Iron Creek Pool, installing trashracks at the Garland Canal Headworks, rehabilitating the head gates, and repairing the damaged outlet sluice. A low-head hydroelectric installation at Corbett Dam was evaluated. Preliminary cost estimates indicate that the power plant addition may not be economically feasible, but more detailed studies and estimates are required to verify this conclusion. Iron Creek Dam Alternative ~le proposed Iron Creek Dam is based on the project outlined by Tudor, and consists of: 1. A 100-ft-high embankment dam with a crest length of about 1,040 ft; 2. A chute spillway with three 35-ft-high by 40-ft-wide radial crest gates; 3. A diversion, river outlet, and power tunnel: 4. A 6.5 MW hydro power plant; and 5. A new gated headworks structure for the Garland Canal, with a 1,000 cfs capacity. The costs of developing a new darn and the cost of the rehabilitation alternative are shown in Table 1. The cost of a new dam will be higher. Shoshone and Heart Mountain Irrigation Districts Page 4 Table 1 COST COMPARISON Repair Exist- Construct ing Corbett New Dam at Dam and Tunnel Iron Creek Capital Cost of Repairing Existing Diversion Works or Constructing New Dam $2,500,000 $23,500,000 Capital Cost of Hydroelectric Power Plant 3,500,000 7,200,000 Present Worth of O&M Cost~/ 300,000 500,000 Present Worth of Hydro Power Benefits1./ (2,100,000) (13,QOO,000) Net Hydro Power Benefits 0]./ (6,200,000) Net Capital Cost of Repair or New Construction $2,500,000 $17,300,000 .!.I Estimated annual O&M, interest at 10 percent, project life 50 years. ~/ Power sales at $0.044 per kWh, interest at 10 percent, and a project life of 50 years. Initial reconnaissance estimates suggest that the Corbett Dam hydro installation may not be economical. More detailed studies may show lower cost or higher benefits, but at this time no net hydro development benefits can be assumed. Shoshone and Heart Mountain Irrigation Districts Page 5 Closing It has been a pleasure working with the District on the studies presented in this Interim Report. We look forward to assisting the District and the Wyoming Water Development Commission in the upcoming Public Information Meeting, and to discussion of the scope of activities for continuing work in Phase II of these stuoies. TABLE OF CONTENTS Page SUMMARY LETTER TABLE OF CONTENTS i LIST OF TABLES iii LIST OF EXHIBITS iii FOREWORD Objective 1 Scope 1 Contents of Report 2 Chapter I - DESCRIPTION OF PROJECT AREA Shoshone Project I-I Buffalo Bill Dam 1-2 Irrigation Development 1-2 Corbett Dam Diversion ~qorks 1-3 Dam 1-4 Tunnel Intake 1-4 Tunnel 1-5 Iron Creek Pond 1-5 Chapter II - CORBETT DAM PROJECT studies Conducted 11-1 Condition of Project 11-1 Corbett Dam 11-1 Corbett Tunnel Intake 11-2 Corbett Tunnel 11-2 Garland Canal Headworks 11-3 Iron Creek Sluice 11-3 Recommended Improvements 11-4 Corbett Dam 11-4 Corbett Tunnel Intake and Sluice 11-4 Corbett Tunnel 11-4 Garland Canal Headworks and Iron Creek Sluice 11-6 Summary of Costs 11-6 -i- TABLE OF CONTENTS (Cont'd) Page Chapter III - CORBETT DAM HYDRO DEVELOPMENT Water Supply 111-1 Corbett Dam Development 111-2 Iron Creek Pool Development 111-4 Comparison of Developments 111-6 Chapter IV - IRON CREEK DAM PROJECT Project Review IV-l Hydroelectric Benefits IV-3 Chapter V - PROJECT COMPARISON Appendix A - REPORT ON CORBETT DAM AND TUNNEL -ii- TABLE OF CONTENTS (Cont'd) LIST OF TABLES Number Title Page I-I Irrigable Areas, Shoshone Project Vicinity 1-3 11-1 Repairs and Modifications to Corbett Dam and Tunnel, Reconnaissance Cost Estimate 11-7 111-1 Average Monthly Flows 111-3 111-2 Corbett Dam Hydro Development, Reconnaissance Cost Estimate III-4 111-3 Iron Creek Pool Hydro Development, Reconnais- sance Cost Estimate 111-6 IV-l Summary of Project Data, Iron Creek Dam IV-2 IV-2 Iron Creek Dam Project, Reconnaissance Cost Estimate IV-4 V-I Cost Comparison V-2 LIST OF EXHIBITS Number Title I-I Project Area Map 1-2 Corbett Dam and Tunnel Intake, Existing Conditions 1-3 Corbett Dam, Plan and Sections 1-4 Corbett Tunnel, Tunnel Sections and Lower Portal 11-1 Proposed Intake Modifications at Corbett Tunnel 11-2 Corbett Tunnel Rehabilitation 111-1 Corbett Dam Hydro Development, Schematic Layout -iii- FOREWORD Harza Engineering Company (Harza) has been retained by the Shoshone and Heart Mountain Irrigation Districts (Districts), of Powell, Wyoming, to evaluate replacing the existing Corbett Dam and Tunnel with a diversion dam at Iron Creek. The purpose of Corbett Dam or the replacement dam at Iron Creek is to divert water from the Shoshone River to the Garland and Frannie Divisions of the Bureau of Reclamation's Shoshone Project.
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