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ANGOSTURA UNIT (19) Description: Angostura Unit is located on the Cheyenne River, 7 miles southeast of Hot Springs, South Dakota. The dam will be a con- crete structure about 150 feet high and 960 feet long, with an earth .~ dike 940 feet long on the right abutment. The reservoir capacity will be 220,000 acre-feet for the irrigation of 16,180 acres. Program FY48 ($3.309.000): Angostura Dam was under construction at the start of the fiscal year (30 percent complete). The contractor scheduled the dam to be 77 percent complete at the end of the fiscal year. Designs and specifications were to be initiated for the main canal. Accomplishments FY48: By the end of fiscal year all foundation excavation was completed for the. dam and 48.5 percent (135,824 yards) of the total concrete placed. The contract for the dam was 63 percent complete, with 71 percent of contract ttme elapsed. The sheet-piling diversion wall failed on March 16, 1948 and was again over-topped by a flash flood on June 18, causing considerable delay in construction operations. Costs to June 30, 1948 were $2,800,634. HEART RIVE~ UNIT (18) Description: Heart River Unit, in southwest North Dakota, involves construction of two reservoirs and a system of pumping plans and canals. Irrigation will be provided for approximately 14,000 acres of dry land. Heart Butte Dam will be an earthfill structure with a height of 124 feet and a crest length of 1,850 feet. Reservoir storage will be 425,000 acre-feet. Dickinson Dam will be an earthfill-t~~ with a height of 45 feet and a crest length of 1,600 feet. Reservoir storage. will be 16,500 acre-feet. Program FY48 ($830.000): Construction of Heart Butte Dam and re- location of State Highway No. 49 will be started. Invitations to bid will be issued for the pumping plants. Construction of a Government camp at Glen Ullin was to be started. Construction is to be started on Dickinson Dam. (.) --I Accomplishments FY48: Notice to proceed on Heart Butte Dam was acknowledged by the contractor on }~rch 22, 1948, and 15 percent of the contract was completed at the end of the fiscal year. Building of the access road was started and excavation for spillway dam, foundation, _ and outlet works was underway. Three contracts were let for residences; ~ sewerage and water system, and a laboratory for the Government camp at Glen Ullin. Invitations to bid for Dickinson Dam were ready for issu- ance but were withheld due to insufficient funds for normal construc- tion during the entire year. Costs to June 30, 1948 were $868,399, or $.38,399 in excess of the program. 16