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<br />recreation, John Martin Reseryoir supplies water to the irrigated lands
<br />below the dam as far as Garden City, Kansas. The top of the con-
<br />servation pool is 3,851 feel above mean sea level, which provides
<br />350,951 acre-feet of storage for irrigation. The release of stored flood
<br />waters in excess of the conservation and recreation pools and above
<br />elevation 3,851 feet is planned so that, when combined with flows
<br />originating downstream from the dam, the capacity of the channel will
<br />oot be exceeded. Upon request of the Arkansas River Compact
<br />Administration, irrigation water for downstream water users is
<br />released through the outlet works in the base of the dam, Downstream
<br />flood damages prevented by John Martin dam already exceed the cost
<br />of the project. Benefits haye already passed the $92 million mark.
<br />Recreation and favorable fish and wildlife habitats are derived from
<br />this project. With reservoir lands open to all, there are many attractive
<br />public use areas for outdoor recreation, water sports. fishing and
<br />boating, or just relaxed living. During construction some embankment
<br />material was obtained from a 75-acre tract of land immediately
<br />downstream of the dam. This excavated area, averaging 12 feet deep,
<br />filled with water and formed Lake Hasty, the center of year-round
<br />recreation.
<br />John Martin Dam consists of a concrete gravity structure 1,644 feet
<br />long and 120 feet high. and an earthfill structure 2,600 feet long. The
<br />concrete gravity structure contains a gated spillway provided with
<br />sixteen 30 feet by 64 fooftainter gates with their operating machinery..
<br />There are earthen wing dams on either side of the main darn. The
<br />north wing dam is 3,880 foot long, connecting to the earthfill structure
<br />of the main dam at the north abutment. The south wing dam is 5,807
<br />feet long and connects to the south end of the concrete structure of the
<br />main dam. A bituminous-surfaced roadway, 21 feet wide, extends along
<br />the crest of the north wing dam, main dam, and south wing dam. The
<br />oyerall length of the structure is 2.6 miles. Detailed project data are
<br />shown below.
<br />DAM
<br />Total length, feet,
<br />Maximum height aboye streambed, foot,
<br />Width of roadway on dam, feet,
<br />
<br />13,945
<br />118
<br />21
<br />
<br />SPILLWAY
<br />Total length, including piers, feet,
<br />Crest gates, 30' x 64' ,
<br />Discharge capacity, cubic feet per second.
<br />
<br />1,174
<br />16
<br />",.... ,639,200
<br />
<br />OUTLET WORKS
<br />Sluicing conduits, 6' x 7',>'
<br />Regulating conduits, 4' x 4' ,
<br />
<br />4
<br />2
<br />
<br />RESERVOIR
<br />Capacity, acre-feet, , " , ,621,326
<br />Flood control storage, acre-feet, ' , , , , , , , ,270,375
<br />Conservation <irrigation) and recreation, storage, acre-feet. . . ..350951
<br />Water surface at spillway crest, acres. 8:960 .
<br />Water surface at top of conservation pool, acres 11,655
<br />Water surface at top of flood control pool, acres, , 17,630
<br />Drainage area, square miles. 18,915
<br />A Ih-mile of the historic Santa Fe Trail north of the reservoir has
<br />
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