Analysis of regional runoff-______________________ Streamflow variability_____________________ Streamflow expressed in units of standard deviation ____ _________________________________ Regional runoff characteristics.________--____-__-_ Streamflow as indicated by tree rings____________ Problems of correlation______________________ Results of correlation studies.________________

EXPLANATIONThis index lists the streamflow and reservoir stations in the Western Gulf of Mexico basins for which records have been or are to be published in reports of the Geological Survey for periods prior to September 30, 1955. Periods of record for the same station published by other agencies are listed only when they contain more detailed information or are for periods not reported in publications of the Geological Survey. Station names are given in their most recently published forms. Parentheses around part of a station name indicate that the enclosed word or words were used in an earlier published name of the station or in a name under which records were published by some agency other than the Geological Survey.The drainage areas, in square miles, are the latest figures published or otherwise available at this time. Drainage areas that were obviously inconsistent with other drainage areas on the same stream have been omitted. Under 11 period of record 11 breaks of less than a 12-month period are not shown. A dash not followed immediately by a closing date shows that the station was continued in operation beyond September 30, 1955. The years given are calendar years. All periods of record not contained in water-supply papers on surface-water supply of the United States are. indicated by appropriate footnotes.

EXPLANATIONThis index lists th~ streamflow and reservoir stations in the Lower Mississippi River basin for which records have been or are to be published in reports of the Geological Survey for periods prior to September 30, 1955. Periods of record for the same station published by other agencies are listed only when they contain more detailed information or are for periods not reported in publications of the Geological Survey. Station names are given in their most recently published forms. Parentheses around part of a station name indicate that the enclosed word or words were used in an earlier published name of the station or in a name under which records were published by some agency other than the Geological Survey.The drainage areas, in square miles, are the latest figures published or otherwise available at this time. Drainage areas that were obviously inconsistent with other drainage areas on the same stream have been omitted. Under 11 period of record 11 breaks of less than a 12-month period are not shown. A dash not followed immediately by a closing date shows that the station was continued in operation beyond September 30, 1955. The years given are calendar years. All periods of record not contained in water-supply papers on surface-water supply of the United States are indicated by appropriate footnotes.

EXPLANATIONThis index lists the streamflow and reservoir stations in the Pacific slope basins in California for which records have been or are to be published in reports of the Geological Survey for periods prior to September 30, 1955. Pe~ibds of record for the same station published by other agencies are listed only when they contain more.detailed information or are for periods not reported in publications of the Geological Survey. Station names are given in their most recently published forms. Parentheses around part of a station name indicate that the enclosed word or words were used in an earlier published name of the station or in a name under which records were published by some agenc·y other than the Geological Survey.The drainage areas, in square miles, are the latest figures published or otherwise available at this time. Drainage areas that were obviously inconsistent with other drainage areas on the same stream have been omitted.Under "period of record" breaks of less than a 12-month period are not shown. A dash not followed immediately by a closing date shows that the station was continued in operation beyond September 30, 1955. ·The years given are calendar years. All periods of record not contained in water-supply papers on surface-water supply of the United States are indicated by appropriate footnotes.

This index lists the streamflow and reservoir stations in the Colorado River basin for whi records have been or are to be published in reports of the Geological Survey for periods prior September 30, 1955. Periods of record for the same station published by other agencies are listed only when they contain more detailed information or are for periods not reported in publications of the Geological Survey.The stations are listed in the downstream order first adopted for use in the 1951 series o water-supply papers on surface-water supply of the United States. Starting at the headwater of each stream all stations are listed in a downstream direction. Tributary streams are indicated by indention and are inserted between main-stem stations in the order in which they enter the main stream. To indicate the rank of any tributary on which a record is available and the stream to which it is immediately tributary, each indention in the listing of stations represents one rank. A stream name only is inserted where necessary for the purpose of showing the proper rant or order of tributaries.Station names are given in their most recently published forms. Parentheses around part of a station name indicate that the enclosed word or words were used in an earlier published name Df the station or in a name under which records were published by,some agency other than the Geolo leal Survey.The drainage areas, in square miles, are the latest figures published or otherwise available at this time. Drainage areas that were obviously inconsistent with other drainage areas on the same stream have been omitted.Under "period of record" breaks of less than a 12-month period are not shown. A dash not followed immediately by a closing date shows that the station was continued in operation beyond September 30, 1955. The years given are calendar years. All periods of record not contained ii water-supply papers on surface-water supply of the United States are indicated by appropriate footnotes.Records both of gage height and of discharge are listed for streamflow stations, and recoris of gage height and of contents (or of change in contents) are listed for stations on reservoirs Records of gage heights only and records consisting only of monthly figures either of streamflo*r or reservoir contents are designated by symbols and footnotes. For early years when daily discharges were not generally published by the Geological Survey, published daily gage heights and a published rating table were considered to be equivalent to daily discharges.An alphabetical index of streams, canals, and reservoirs is given on pages 26 to 31. Drainage areaGaging station (aq ml) Period of record Colorado River:Transmountain diversion Grand River ditch 'at La Poudre Pass, Colo.