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. from Caddoa Reservoir Project to John Martin Reservoir Project, in honor of the late Congressman John A. Martin of Colorado. It is operated by the United Stales Anny Engineer District, Albuquerque, New Mexico. Mr. Russell Smith has been the resident superintendent of the project since Octoher, 1!176. The John Martin Reservoir Project is part of the comprehensive plan for the control of floods and the development of the water resources of the entire Arkansas River basin. The reservoir provides 270.:f75 acre-feet of storage capacity for flood control. It protecta the fcrtile Arkansas River Valley below the dam from floods originating in the 18.915 square miles of the Arkansas River basin above the dam. It provides 350.951 acre-feet of storage space for conservation and recreation. John Martin Reservoir suppliea water to the irrigated lands below the dam as far as Garden City. Kansas. The top of the con- servation pool is 3,851 feet above mean sea level. which prOVides 350,951 acre-feet of storage for irrigation. The release of stored flood waters in excess of the conservation and recreation poolll and ahove elevation 3,851 feet is planned so that, when combined with flows originating downstream from the dam, the capacity of the channel will not be exceeded. 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 dam. Downstream flood damages prevented by John Martin Dam already exceed the cost of the project. Benefits ha ve already passed the $92 million mark. Recreation and favorable fish and wildlife habitats are derived from this project. With reservoir lands open to all, there are many attractive public use areas for outdoor recreation, water sports, fishing and boating. or just relaxed living. During construction some embankment material was obtained from a 75-acre tract of land immediately downstream of the dam, This excavated area. averaging 12 feet deep, filled with water and fonned Lake Hasty, the center of year-roWld recreation. John Martin Dam consists of a concrete gravity structure 1,644 feet long and 120 feet high, and an earthfill structure 2,600 feet long, The concrete gravity stJ1lCture contains a gated spillway provided with sixteen 30 feet by 64 feet tainter gales with their operating machinery. There are earth... wing dams on either side of Ihe main dam. The north wing dam is 3,880 feel long, connecting to the earthfill structure of the main dam at the north abuboent. The south wing dam is 5,807 feel long and connects 10 the south end of the concrele stJ1lCIure 01 the main dam. A bitwninous-llurfaced roadway, 21 feet wide, extends along the crest of the north wing dam, main dam, and south wing dam. The oveTllll I...gth of the stJ1lCture is 2.6 miles. Detailed project data are shown below. DAM Totall...gth, feet. . . . .. .. . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . . . . . .13,MS Maximum height above atreambed, feel ..... . .. .. .. .. .. . .. .. . .. . 118 Width of roadway on dam, feet..... ............. ................. 21 SPILLWAY Total length, including piers. feet.....................,.......... 1,174 Crest gales, 30' x 64' ............................................. 18 Discharge capacity, cubic feet per second. . . . . . . . . . . . . . . . . . . . . . .839,200 -7-