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beginning of the period of record for the 13 sites listed in table 2. Eight ~ of the sites were missing only dissolved-solids records; their streamflow en records began earlier than 1941. The remaining five sites required extension en of streamflow and dissolved-solids records. C)l Some techniques used for record extension require data from a base- station site having a record that overlaps the record at the extension site and includes the entire extension period. Descriptions of the base-station sites used in this study are listed in table 2 and their locations are shown in figure 1. Base-station sites included five biennial-report sites that had complete records and four additional sites. Table 2.--Record-extension and base-station sites used in this study [dashes indicate data not available] Site number in fig- ure 1 U.S. Geologi- cal Survey station number Station name Historical period of record (water years) 1 Dissolved Streamflow solids2 RECORD-EXTENSION SITES Missing streamflow and dissolved solids data: 5 7 9 12 16 09180000 09217000 09234500 09302000 09328500 Dolores River near Cisco, Utah Green River near Green River, Wyo. Green River near Greendale, Utah Duchesne River near Randlett, Utah San Rafael River near Green River, Utah 1951-83 1952-83 1951-83 1943-83 1946-83 1951-83 1952-83 1957-83 1957-83 1947-83 Missing dissolved-solids data: 1 10 13 17 19 21 23 24 2 4 8 11 14 15 18 20 22 09071100 09251000 09306500 09355500 09380000 09415000 09427520 09429490 09095500 09179500 09225500 09295000 09315000 09324500 09379500 09402500 09421500 Colorado River near Glenwood Springs, Colo. Yampa River near Maybell, Colo. White River near Watson, Utah4 San Juan River near Archuleta, N. Mex. Colorado River at Lees Ferry, Ariz. Virgin River at Littlefield, Ariz. Colorado River below Parker Dam, Ariz.-Calif. Colorado River above Imperial Dam, Ariz.-Calif. 31899-1983 1916-83 1923-83 51928-83 1895-1983 1930-83 1935-83 61935-83 1942-83 1951-83 1951-83 1955-83 1942-83 1949-83 1964-83 71943-83 RASE-STATION SITES Colorado River near Cameo, Colo. Dolores River at Gateway, Colo. Green River near Linwood, Utah Duchesne River at My ton, Utah Green River at Green River, Utah Cottonwood Creek near Orangeville, Utah San Juan River near Bluff, Utah Colorado River near Grand Canyon, Ariz. Colorado River below Hoover Dam, Ariz.-Nev. 1934-83 1937-54 1929-62 1912-83 1905-83 1933-83 1914-83 1923-83 1934-83 1934-83 1929-83 1976-83 1928-83 1926-83 1935-83 lWater year is defined as the period from October 1 through September 30 and is designated by the calendar year in which it ends. 2Computed monthly values. 3Streamflow from streamflow-gaging station 09072500, Colorado River at Glenwood Springs, Colo., prior to water year 1966, and from the difference between values at streamflow-gaging stations 09085000, Roaring Fork River at Glenwood Springs, Colo., and 09085100, Colorado River below Glenwood Springs, Colo., for water years 1966-83. 4After water year 1978, data are from streamflow-gaging station 09306395, White River near ColO.-Utah State line. 5Prior to December 1954, streamflow data are from streamflow-gaging station 09356500, San Juan River near Blanco, N. Mex. 6Computed monthly streamflow (method described in U.S. Geological Survey water-data reports for Arizona published annually). 7Dissolved-solids data for water years 1942-69 from water-quality station 09525500, Yuma Main Canal below Colorado River Siphon, at Yuma, Ariz. 4