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000iB1 ANGOSTURA UNIT Description: Angostura Dam is located on the Cheyenne River, seven miles southeast of Hot Springs, South Dakota. It will be a concrete structure about 160 feet high M,d 960 feet long, with an earth dike 9/1) feet long on the right abutment. With a total stora38 capacity of 220,000 acre-feet; 92,000 acre-feet will be utilized for irrigation of 12,3/1) acres of land; 60,000 acre-feet will provide flood control and 68,000 acre-feet of dead storage will allow for silt detention and provide a sufficient altitude for diversion for irrigation of lands below the dam. The entire Angostura Unit is estimated to cost ~14,198,000. The contract for construction of Angostura Dam was awarded to the Utah Construction Company on June 28, 1946 for (~4,237,476. As of June 30, 1949 a total of $8,430,105 had been spent on Angostura Unit. The dam is scheduled for completion in November 1949. Plans for canal and lateral construction are well advanced and it is planned to begin contruction on this feature during the latter part of fiscal year 1950 or early in fiscal year 1951. A total of 20,480 acres was covered by detailed land classifica- tion bringing the total to 28,680. Farm budgets, payI1lent capacity and water charGe studies were completed in the field. The following is a brief comparison of the fiscal year 1949 pro- gram with accomplishments. A graphic representation of the work per- formed during the year is sho..m on the opposite page. Program FY49 Funds available - $3,975,060. Accomplishments FY49 Costs to June )0, 1949 - $4,025,244. Construction of AnGostura Dam was to be 88 percent complete at the end of the fiscal year according to the contractor's ,schedule. Construction of the dam lias 86 percent complete on June )0, 1949 with 87 percent of the contract time elapsed. Clearing of the reservoir was to be essentially completed. Concrete work is now 92 percent complete and embankment is 78 percent complete. 23