Project cost estimate Summary construction program (PB-1), fiscal years 1964 and 1965 Item DARDANELLE LOCK AND DAM, ARKANSAS RIVER, ARK. (Continuing) Location. On the Arkansas River in Pope and Yell Counties, Ark., about 2 miles upstream from the town of Dardanelle, Ark., and 257.8 miles above the mouth. Authorization.-1946 River and Harbor Act. Benefit-cost ratio.-1.4 to 1 (multiple-purpose plan for lower Arkansas River Basin). Summarized financial data Type: Gate controlled, concrete ogee weir with stilling basin. Design capacity: (maximum probable flood) 1,500,000 cubic feet per second. Lock: Type: Single chamber, single lift, with miter gates. Size: 110 feet wide by 600 feet long. Normal (maximum) lift: 54 feet. Reservoir capacity: Power and dead storage, 500,000 acre-feet. Power installation: Presently planned: 4 units at 31,000 kilowatts; 124,000 kilowatts. The Dardanelle Lock and Dam is a unit of the overall comprehensive plan of development of the Lower Arkansas River Basin and provides for navigation and generation of hydroelectric power. The navigation plan for the Arkansas River will provide a dependable waterway for transportation of iron and steel products, general commerce, and will open commercial navigation to one of the most important regions in the United States for the production, processing, and shipment of petroleum and its products. Many existing industries are being relocated, and numerous new industries are being established in the tributary area. The power-generating capacity of the Dardanelle Lock and Dam will total 124,000 kilowatts, all of which would be installed initially. All of the energy to be generated at this project can be absorbed by the Southwest power pool system and used in this area. Fiscal year 1965.-The requested amount of $10 million will be applied to: Complete relocations___ Complete right abutment and Russellville dike. Powerplant, continue construction and procurement Initiate operational roads.. Complete Hartman bottom levee (lower section). Complete McLean bottom and Russellville pumping stations. Continue public-use facilities__ Initiate overlook shelter and grading and landscaping- Supervision and administration__ Total... $3, 264, 000 121, 800 4, 461, 600 1,000 594, 000 139, 800 490, 000 3,000 77, 600 240, 000 607, 200 10, 000, 000 Completion of Dardanelle Lock and Dam as scheduled is desirable in order to realize, prior to completion of navigation to Dardanelle, the maximum benefits from the degradation dowrstream expected to result from its construction. To meet this schedule, it is necessary that relocations in the reservoir area and construction of the powerplant and other features be continued in fiscal year 1965. Non-Federal costs. Costs allocable to power, presently estimated at $37,968,000, are reimbursable. Status of local cooperation.-None required for construction. Responsibility for repayment of power costs rests with the Department of the Interior pursuant to Federal laws. Comparison of Federal cost estimates.-The current Federal cost estimate of $79 million is a decrease of $5 million from the latest estimate submitted to Congress ($84 million). This change includes a net reduction of $6,199,000 due to bids received for powerhouse construction and electrical supply contracts, a decrease of $98,000 based on costs of completed work, a reduction of $1,447,000 in allowance for contingencies, and a reduction of $932,000 for supervision and administration based on a recent reanalysis of requirements. These decreases were partially offset by an increase of $3,676,000 to provide for the addition of the Russellville sewage outfall system authorized by Public Law 87-874, dredging below Ozark Lock and Dam, and other items based on a recent reanalysis of requirements. Summary construction program (PB-1), fiscal years 1964 and 1965 Location.-On Mountain Fork River 20.3 miles above its confluence with Little River, a tributary of Red River, near Broken Bow, Okla. Authorization.-1958 Flood Control Act; 1962 Flood Control Act (added power). Benefit-cost ratio.-2.4 to 1. 1 Costs allocable to power are reimbursable, amounts not yet determined. 3, 000, 000 7, 116, 000 4,800,000 27,684,000 Spillway: 9, 500 439, 200 1, 368, 800 Type: Gate controlled, concrete ogee weir, with chute apron (8-40 feet by 40 feet tainter gates). Design capacity (maximum pool): 443,000 cubic feet per second. Presently planned: 2 units at 50,000 kilowatts; 100,000 kilowatts. This project is a key unit of the seven-reservoir system in the Little River Basin, consisting of the authorized Millwood, Dierks, Gillham, DeQueen, Broken Bow, Lukfata and Pine Creek Reservoirs. Operation of this system would provide a high degree of protection to 139,000 acres of land in the Little River Basin and to 663,000 acres of flood plain area along Red River. The annual crop production for these areas under present conditions is about $20 million and the value of other property, excluding minerals, is in excess of $100 million. Little River is one of the principal flood producing streams on Red River below Denison Dam, 30 as demonstrated by the 157 floods that have occurred at the Millwood Dam site during a 21-year period (October 1937 through September 1958). Construction of the project would provide urgently needed flood protection to farm lands and physical properties in the Little River and Red River Basins. In addition ro providing flood protection, the project has 80,600 acre-feet of storage allocated to industrial and municipal water supply, which is expected to yield about 175 million gallons per day. Also the project will provide 100,000 kilowatts dependable capacity at the site which will be needed to supply the loads by the poweron-line dates. Fiscal year 1965.-The requested amount of $4,800,000 will be applied toContinue acquisition of land in reservoir area.. Continue relocations... Continue construction of embankment and dike. Continue powerplant.... Complete construction of left abutment access road.. Initiate recreation facilities... Continue permanent operating equipment.. Engineering and design... Supervision and administration.___ Total..... $472, 000 245, 000 1, 700, 000 1, 011, 000 475, 000 346, 000 200, 000 2,000 Non-Federal cost.-Local interests are required to reimburse the Federal Government for costs allocated to water supply storage over a period not to exceed 50 years after use of this storage is initiated. This reimbursement is presently estimated at about $2,970,000 exclusive of interest. The costs allocable to power are reimbursable. determined by cost allocation studies at this time. The amount has not been Status of local cooperation.-Local cooperation required is limited to repayment of costs allocated to water supply features of the project under contracts to be negotiated at the proper time. The Mountain Lakes Water District, by resolution dated September 7, 1961, requested that water supply storage be included in the project for future water supply needs, recognized the requirements of repayment of costs allocated to water supply, within the life of the project, and assured that demand for the use of this storage will be made within a period of time which will permit paying out the cost allocated to water supply. Responsibility for repayment of power costs rests with the Department of Interior pursuant to Federal laws. Comparison of Federal cost estimates.-No change in the latest estimate submitted to Congress. Summary construction program (PB-1), fiscal years 1964 and 1965 |