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<br />resources of the entire Arkansas Ri\'er basin. The reservOlr provides <br />270.Ji'5 acre-feet of storage capacity for flood control. It protects the <br />fertile Arkansas River valley below the dam from floods originating m <br />Ule ]R,91~ square miles of the Arkansas River basin aoove the <br />dam It provides :J50.951 acre-feet of storage space for conservation <br />and recreatIOn John Martin Reservior supplies \\.'aler to (he <br />irngatcd lands below the dam as far as Garden City, Kansas The <br />lop of the conservatIOn pool is 3,8.51 feet above mean sea level. which <br />pro\;des 350,951 acre-feet of storage for irrigation. The release of <br />slared flood waters in excess of the conservatlOn and recreation pools <br />and above elevation 3.8.51 feet is planned so that. when combmed with <br />flows originating downstream from the dam, the capacity of the <br />channel will not be exceeded, Upon request of the Arkansas River <br />Compact AdminIstration, irrigation water for downstream water users <br />IS released through the outlet works in the base of the darn. Down. <br />slream flood d.1.mages prevented by John Marlin Dam already exceed <br />the l'ost of the project Benefits have already passed the $92 million <br />mark <br />Recreation and favorable frsh and wildlife habitats are deflved from <br />thl~ PI'oJec! With reservoir lands Qpen to 011. there are many attractive <br />puulic u.se area=. for uutdoor reae-at ion, W<lter s.ports. fishmg and <br />hntltin~. or iust relaxed living. During c()ll~lruction some cmb<lnkment <br />m<ltcri;Il was obt;;lined from <-l i'5-atre tract of land Immediatel\' <br />downstre<lm of the dam. This excavated area, averagmg 1:.1 feet deep, <br />liUed With water and formed Lake Hasty, the center of year-rOlmd <br />recreation. <br />John l\lartin Dam consists of a concrete gravitj. structure 1,644 feet <br />long and l:!u fee! high, and an earLhfill structure 2.GOO feet long. The <br />concrete gravIty structure contams a gClted spillway prOVided with <br />sixteen :lU feet by 6-1 feet tainter gates with their operating machinery. <br />There are earthen v.'ing dams on either side of the main dam. The <br />north wing dam is 3.RRO feet long, connecting to the earthfill structure <br />or the mall1 dam at the north abutment. The south wing dam is 5,807 <br />feel long and l'onnects to the south end of the concrete structure of the <br />main dam. A bitwninous-surfaced roadway, 21 feet wide, extends along <br />the crest of the north wing dam. main dam, and south wing darn. The <br />o\'erall length uf the struclure is 2.fi miles. Detailed project data are <br />shown heluw. <br /> <br />1),\,,\1 <br />Total length. feet <br />MaXimum heighl abo\'e strei.:lmhed, feet <br />WIdth of roadway all dam, feet <br /> <br />13.945 <br />118 <br />21 <br /> <br />SPILLWAY <br />Totalll~llgth, induding piers, feet <br />Crest gi-ltes. :w' x 64' . <br />Discharge capacity, cubic feet per second <br /> <br />1,174 <br />16 <br />,639.200 <br /> <br />nUTLE:T W{)fU(S <br />Sh/icing t'onduit.<;, V' X 71:::' <br />Kegulating conduits, .r X ,t' <br /> <br />4 <br />2 <br /> <br />}{Es!':}{Vnm <br />Capi'lcity. acre-feet <br />Fluod control storage, acre-feet <br /> <br />621.326 <br />.270,375 <br /> <br />-7- <br />