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8. 1ne geology, soils, climate, precipitation, and meteorological influences were presented in detail in the 1960 report. .~ .~ JOHN MARTIN RESERVOIR PROJECT ,. "l ~ ~ C.1l ~1 9. ~oject description. John Martin Dam is located on the Arkansas River in Bent County, Colorado, between the towns of Las Animas and Lamar, as shown on plate 1. It is a multiple-purpose project constructed for flood control and irrigation. Pertinent data for some of the fea- tures of the project are shown in table 1. In. Design operation. John Martin Reservoir was designed to operate as a multiple-purpose project with storage allocated to flood control and conservation of irrigation water. Storage was not originally provided for recreational or biological activities but the Flood Control Act of 1965 (Public Law 89-298, 89th Congress, S 2300) authorized and directed the Chief of Engineers to use reservoir flood control storage space, not to exceed 10,000 acre-feet, for the purpose of establishing and maintaining a permanent pool for fish and wildlife and recreational purposes. This is to be performed at such times as storage space may not be available within the conservation pool as defined in Article III F, Arkansas River Compact (63 Stat. 145). 11. The storage and release of water for irrigation at the proj- ect are performed in accordance with the Arkansas River Compact. Release of storage from the flood control pool is at the discretion of the Corps of Engineers. Before 1948 irrigation releases .from John Martin Reservoir were very irregular due partly to lack of agreement between the States of Colorado and Kansas. A temporary agreement between the states was reached in 1948. A final agreement in the form of a compact was signed by the two states and ratified by the United States Congress. A portion of the Arkansas River Compact pertaining to storage and discharge at John Martin Dam is as follows; CoLorado and Kansas hereby agree upon the foLLow- ing basis of apportionment of the waters of the Arkansas River: A. Winter storage in John Martin Reservoir shaH commence on November 1st of each year and continue to and incLude the next succeeding March 31st. During said period aLL water entering said reservoir up to the Limit of the then avaiLabLe conservation capacity shan be stored: ~ovided, that CoLorado may demand reLeases of water equivaLent to the river flow, but such reLeases shaLL not exceed 100 cubic feet per second and water so reLeased shaLL be used without avoidabLe waste. B. Summer storage in John Martin Reservoir shaH comm~nceon April 1st of each year and continue to and 3