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<br />. <br /> <br />~... <br />o <br />-.J <br />0) <br /> <br />.; <br /> <br />. <br /> <br />EVALUATIONS OF EXISTING SALINITY CONDITIONS (continued) <br /> <br />as no perennial stream enters between the gages. <br />quality records were estimated by correlations witll <br /> <br />The missing periods of <br />flow records. <br /> <br />San Juan River near Archuleta, New Mexico (Station No. 13). For the <br />period 1954-74 flow and quality data presented are a combination of mea- <br />surements obtained near Archuleta and at Blanco) New Mexico, with a few <br />adjustments and correlations. Correlations 'Mere emlJloyed to estimate the <br />data for 1941-54. Quality data for 1969 through 1976 were estimated frum <br />once-a-month sampling at the Archuleta gaging station. Quality data iur <br />1977 and 1978 were estimated by correlation with the quality data at <br />the Navajo Dam Stat ion. In 1974 electrical conduct LV ity measureloents <br />were started on a 3-time per week basis along with occasional chemical <br />analyses. These measurements indicate the quality to be very unifonll since <br />the station is close to the outlet works of the Navajo Dam. <br /> <br />San Juan River near Bluff, Utah (Station No. 14). For the period <br />from 1941-76 the records of flow and water quality are complete. For 1977 <br />missing quality data were estimated by correlations with the quality data <br />at the Shiprock, New Mexico Station, and in 1978 by the quality data at tile <br />Farmington) New Mexico Station. <br /> <br />Colorado River at Lees Ferry, Arizona (Station No. 15). This station <br />has cOhlplete flow records available for the study period but lacks quality <br />of water rr,easurements for 1941, 1942, 1946, and 1947. Quality dat~ for <br />these years were estimated by extensive multiple correlations using data <br />for the Colorado River near Cisco) Utah, and near Grand Canyon, Arizona; <br />the Green River at Green River, Utah; and the San Juan River llear Bluff, <br />Utah. Water samples are collected monthly by the Geological Survey for a <br />chemical analysis of major constituents and nutrients analysis. Samples <br />for minor element analyses are collected quarterly. Specific conductance <br />and field water temperature measurements are made daily. <br /> <br />Colorado River near Grand Canyon, Arizona (Station No. 16). How <br />records are available for the report period and cherr.ical quality records <br />are also available except for the perio<i December 194" to AuguRt 1943. <br />Quality data for the period of missing records were estimated from records <br />at upstream stations. Water samples are collected and chemical analyses <br />are made monthly by the Geological Survey, with records dating baCK to <br />[925. <br /> <br />Virgi n River at Li tt Ie fie Id, Arizona (St at ion No. 17). Flow records <br />are available for the report period, but quality data are available only <br />fro," July 1949 to the present. Detailed correlations were employed to <br />estimate the data for the missing period. Determinations are ~ade daily <br />by the Geological Survey for specific conductance, and water ter:lperature <br />cher.1ical analyses are made r.J.onthly unless significant changes in con- <br />ductivity occur." <br /> <br />Colorado River below Hoover Darn, Arizona-Nevada (Station No. 18). <br />Discharge and quality records are available from October 1939 until the <br /> <br />40 <br />