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. . . ~ 1\) OJ (C) Center, Denver, Colo. 80225; and at U,S, Geological Survey Public Inquiries Offices, Rm, 8102, Federal Building, 125 South State Street, Salt Lake City, Utah 84138, and Rm. 1012, Federal Bui lding, 1961 Stout Street, Denver, Colo. 80202. Copies may be made at the requestor's expense at either of the above U.S. Geological Survey Public Inquiries Offices, by writing to the depository and referring to the report by title. The data used in this report are all of the historical streamflow and water-quality records for the following U.S. Geological Survey stations and periods of records listed below; the stations are shown on figure 1, Station no. Stream and S t reamf 1 ow Water location qual ity Colorado River near Cameo, Colo. 1 934-74 1936-74 Plateau Creek near Cameo, Colo, 1936-74 1972-74 Gunnison River near Grand Junc- tion, Colo. 1897-99 1902-06 1917-74 1936-74 Colorado River near Colorado-Utah State 1 i ne, 1951-74 Colorado River below Colorado-Utah State 1 ine. 1962-69 1973-74 Dolores River near Cisco, Utah. 1952-74 1952-74 Colorado River near Cisco, Utah. 1914-17 1936-74 1923-74 D9095500 09105000 09152500 09163500 09163530 09180000 09180500 ,The computations give several alternative methods that can be used to calculate salt load and they indicate that different methods can produce different loads. Most of the salt loads give values within about +30 percent of the average of all methods combined, but differences of 70 percent do occur, Periods of missing record for the Colorado River at the State line as well as missing periods for the Dolores River near Cisco, Utah, and the Colo- rado River near Cisco, Utah, prevent the direct computation of salt load by all methods for the complete time period. Estimates for the missing periods must be used. Complete water-quality records for all stations where this type of data are derived is very rare and, therefore, statistical methods, such as C and E (see "Salt-Load Computations"), which build a water-qual ity record from streamflow are very valuable if they will give results that are within error 1 imits that are acceptable, There is no perfect substitute for good data over the required time period and, therefore, it is desirable to continue to collect data for future use. Regression curves of discharge versus specific conductanc~ and of speci- fic conductance versus calcium, magnesium, hardness, sodium, bicarbonate, chloride, dissolved sol ids, and sulfate are presented on figures 2-54. 2