Laserfiche WebLink
<br /> <br />. <br /> <br />~ <br />IV <br />~ <br /> <br />EVALUATIONS OF EXISTING SALINITY CO~~ITIONS <br /> <br />, , <br />~~ the Green River, Utah; and the San Juan River near Bluff, Utah. Water <br />samples are collected monthly by the Geological Survey for a chemical <br />analysis of major constituents and nutrients analysis. Samples for minor <br />element analyses are collected quarterly. Specific conductance and field <br />water temperature measurements are made daily. <br /> <br />Colorado River near Grand Canyon, Arizona (Station No. 13).--Flow <br />records are available for the report period and chemical quality records <br />are also available except for the period December 1942 to August 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 1925. <br /> <br />Virgin River at Littlefield, Arizona (Station No. l4).--Flow records <br />are available for the report period, but quality data are available only <br />from July 1949 to the present. Detailed correlations were employed to <br />estimate the data for the missing period. Determinations are made daily <br />by the Geological Survey for specific conductance, and water temperature <br />chemical analyses are made monthly unless significant changes in con- <br />ductivity occur. <br /> <br />. <br /> <br />Colorado River below Hoover Dam, Arizona-Nevada (Station No. 15).-- <br />Discharge and quality records are available from October 1939 until the <br />present. except for water quality records during the period November 1944 <br />to September 1950. The water quality for this time period is based on <br />specific conductance records and intermittent chemical analyses. The <br />samples used for the chemical analyses are collected monthly by the <br />Geological Survey stream gaging station below the dam. <br /> <br />Colorado River below Parker Dam. Arizona-California (Station No. 16).-- <br />Flow records at this station are available from October 1934 and have <br />been published or are available from the Geological Survey. The water <br />quality data for the period January 1964 through December 1970 were <br />taken at the Geological Survey station, Colorado River below Parker Dam. <br />The water quality data for the period January 1941 through December 1963 <br />used in the "Quality of Water Colorado River Basin Progress Report No. <br />5" were based on chemical analyses of Colorado River Aqueduct flows made <br />by the Metropolitan ~ater District. These data have been adjusted based <br />on a correlation of concurrent Metropolitan Water District records with <br />records made by the Geological Survey below Parker Dam for the year <br />1964-70. The correlated data was then used for the period 1941-63. <br /> <br />. <br /> <br />Colorado River at Imperial Dam. Arizona-California (Station Xo. 17).-- <br />Although Figure 2 indicates flow records are available for the report <br />period. no single station was used to obtain the record. It was obtained <br />from a combination of several stations. Records from January 1941 <br />through September 1942 are from the station. Colorado River near Picacho. <br />California. Records from October 1942 through September 1960 are based <br />on the combined records of discharge obtained at gaging stations <br /> <br />40 <br />