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<br /> <br />COLORADO ARKANSAS <br />RIVER BASIN <br /> <br />.. Saline8oilson <br />Non-Irrigated Land <br /> <br />. Saline Soils on <br />Irrigated Land <br /> <br />'& <br /><& <br />~ <br />. ~. <br />75mlles .~ <br />I <br /> <br />o <br />I <br />o <br /> <br />25 <br />I <br />I <br />50 <br /> <br />50 <br />I <br />I <br />75 kilometers <br /> <br />I <br />25 <br /> <br />1050 <br /> <br />THE PROBLEM <br /> <br />The Lower Arkansas River in Colorado <br />is the most saline stream of its size in the United <br />States. The average salinity levels increase from <br />300 ppm Total Dissolved Solids (TDS) near <br />Pueblo to over 4,000 ppm TDS near the state <br />line. Water containing more than 2,000 ppm <br />TDS has often been assumed to be unsuitable <br />, for irrigation, but such waters have been used in <br />the Arkansas Valley for many years. High sedi- <br />ment loads are also found in this reach of the <br />river. The presence of the sediment load pro- <br />vides a vehicle of transport for pesticides 111 <br />their movement to the river. <br /> <br />Colorado's Nonpoint Assessment Report <br />identified the Arkansas River as being impacted <br />by salinity and sediment pollutants. Agricultural <br />practices contribute to the sediment load of the <br />river. <br /> <br /> <br />37" <br /> <br />NEW MEXICO <br /> <br />1030 <br />OKLAHOMA <br /> <br /> <br />en <br />...: <br />en <br />z <br />>2 <br />