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6, FACTS ABOUT THE JOHN MARTIN PROJECT: The John Manin ReservoirProjecl was buill by the United States Army Corps of Engineers. The project was authorized by Congress in the Flood Control Act of June 22. 1936, when the federal responsibility forfloodconlrol throughoullhe country was assigned [0 the Corps of Engineers. It is located on the Arkansas River. 58 miles upstream from the Colorado. Kansas stateline and 18 miles upstream from the city of Lamar. Colorado. Construction of [he project began in the fall of 1939, but work was suspended by World War 1I from Ihe spring of 1943 to the spring of 1946. The project was completed in October 1948 at a cost of about $15 million. The War Department Civil Appropriation Act of June 24,1940 changed the name of the project from Caddoa Reservoir Project to John Martin Reservoir Project. in honor of the laleCongressman John A. Martin of Colorado. It is operated by the Uni(ed States Army Engineer District, Albuquerque, New Mexico. Mr. Russell Smith has been the resident superintendent of the project since October 1976. The John Martin Reservoir Project is a pan of the comprehensive plan for the control of floods and the development of water resources in the Arkansas River basin. A survey of the reservoir made in 1986 and officially effective as of February I. 1988 shows 259.562 acre~ feet of storage capacity above elevation 3S51.87 for flood control and protection of the fertile Arkansas River Valley below lhed<.lln. The reservoir also provides 348.683 acre-feet of storage sp3ce for conservation and recrealion below c1cv3tion 3R51.R7. John Martin Reservoir supplies water to the irrigated lands below the dam as far down- stream as Garden City. Kansas. The top uf [he con~ervation pool, excluding recreation storage, is 3,851 feet above mean sea level. which provides 338,639 acre-feet of water fOf irrigation. Upon request of the Arkansas River Compact Administration. irrigation water for downstream water users is released through the outlet works in the base of the d3m. The release of stored flood waters in excess of the conservation and permanent (recreation) pool. above elevation 3,851.87 feet is planned so that, when combined with flows originating downstream from the dam. the capacity of the channel will not be exceeded. Downstre3m flood damages prevented by John Martin Dam already exceed the cost of the project and the total project benefits to date have surpassed the $115 million mark. Recreation and favorable fish and wildlife habitats are also derived from this project. With reservoir lands open to all, there are many attractive public use areas for outdoor recreation, water spons. fishing and boating, or just relaxed living. A h31fmile segment of the historic Santa Fe Trail nonh of the reservoir has been enclosed by a fence. An appropriate sign marks this historic site. During conslnlction some embankment material was obtained from a 75 acre tract ofland immediately downstream of the d3m. This excavated area, averaging 12 feet deep. filled with water and formed Lake Hasty, center of year-round recreation. John Martin Dam consists ofaconcrele gravity structure 1,644 feet long and 120 feet high. and an earthfill structure 2.600 feet long. The concrete gravity structure contains a gated spillway provided with sixteen 30 foot by 64 foot tainler gates and their operating machinery. There are earthen wing dams on eilher side of the main dam. The nonh wing dam is 3.880 feel long. connecting to the earth rill structure of the main dam at the north abutment The south wing dam is 5.807 feet long and connects to the south end of the concrete structure of the main dam. A bituminous-surfaced roadway, 21 feet wide. eXlends along the crest of the north wing dam, main dam. and south wing dam. The overall length of the SU1)cture is 2.6 miles. Detailed project data are shown below. 5