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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3'7SU <br /> <br />1975 to be 1,400,000 tons. Of the total, about 600,000 tons came <br />from natural sources and about 840,000 tons (440,000 tons from <br />on-farm irrigation sources and 400,000 tons from off-farm <br />distribution systems) are attributed to irrigated agriculture. <br /> <br />It is probably important to note that these figures are <br />based on a study of only a portion of the Gunnison River Basin. <br />The study unit encompasses the Lower Gunnison River drainage from <br />the Black Canyon of the Gunnison National Monument to just <br />downstream from the confluence of the Uncompahgre and the <br />Gunnison. Estimates of salt loading for irrigated acreage <br />within this area were developed. That portion of the total basin <br />annual salt yield not accounted for by irrigated agriculture in <br />the Lower Gunnison unit was then attributed to natural sources <br />from the remaining unstudied portion of the basin. <br /> <br />BuRec-Feasibility Report <br /> <br />The Bureau of Reclamation describes salt loading from the <br />area within their study. The Bureau studied that portion of the <br />Lower Gunnison River Basin which is within the Uncompahgre River <br />valley and specifically is the area encompassed by the boundaries <br />of the Uncompahgre Project. Seepage from canals and laterals in <br />combination with inefficient irrigation practices result in a <br />salt loading to the Colorado River of about 360,000 tons <br />annually. <br /> <br />BLM-1978-79 Status Report <br /> <br />It is estimated that approximately 53% of the total salt <br />load in the Gunnison River at Grand Junction is contributed by <br /> <br />-27- <br /> <br />, - <br />