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Prepared in cooperation with the
<br />COLORADO DEPARTMENT OF NATURAL RESOURCES,
<br />DIVISION OF WATER RESOURCES,
<br />OFFICE OF THE STATE ENGINEER
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<br />INTRODUCTION
<br />This report describes the hydrogeologic char-
<br />acter stir■ of the valley -fill aquifer in a
<br />reach of the Arkansaa River valley in Pueblo
<br />County, southeastern Colorado. The report con-
<br />sists of three map. that show: (1) The alti-
<br />tude and configuration of the bedrock surface;
<br />(2) the altitude and configuration of the water
<br />table in the spring of 1966; and (3) the satu-
<br />rated thickneaa of the valley -fill. aquifer in
<br />the spring of 1966. Each map xhows the extent
<br />of the saturated valley -till material. The
<br />saturated - thickness map also shows selected
<br />values of aquifer t ranseissivity. Three other
<br />reports describe the hydrogeologic character-
<br />istics of the valley -fill aquifer in a reach of
<br />the Arkansas River in Bent County (Hurt and
<br />Moore, 1972); Crowley and Otero Counties (Nelson
<br />and others, 1989x); and Prowers County (Nelson
<br />and others, 1989b), southeastern Colorado.
<br />METHODS OF STUDY
<br />Information presented in this report is based
<br />on data published by Wilson (1965) and M. 3. and
<br />athera (1970) and on data IocrtrA in the files
<br />oI the U.S. Geological Survey. Bedrack- altitude
<br />data were obtained from test holes, wells, and
<br />observation wells. Test holes were drilled by
<br />contractors and by the U.S. Geological Survey.
<br />Water -level data were collected by the U.S.
<br />Geological Survey in the spring of 1966. The
<br />saturated- thickne s map is based on data from
<br />wells in which the, altitude of the bedrock sur-
<br />face and the water level were measured. The
<br />intersections of the bedrock contours and the
<br />water -table contours provided supplemental
<br />saturated - thickness values that were used as an
<br />aid to contoun.ng. Surface mapping and test -
<br />drilling data were used by Major and others
<br />(1970) to define the extent of the valley -fill
<br />aquifer. The tranamissivity values were esti-
<br />mxteA by Wilson (1965) from aquifer -test data.
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<br />REITM14CES CITED
<br />Hurt, R.T., and Moore, J.E., 1972, Hydrogeologic
<br />characteristics of the valley -fill aquifer in
<br />the Arkansas River valley, Bent County,
<br />Colorado: U.S. Geological Survey Hydrologic
<br />Investigations Atlas RA -461, scale 1:62,500,
<br />2 sheets.
<br />Major, T.J., Hurr, R.T., and Moore, J.E., 1970,
<br />Hydrogeologic data for the lower Arkansas
<br />River valley, Colorado: Colorado Water
<br />Conservation Board Water Resources Basic-
<br />Data Release 21, 125 p.
<br />Nelson, G.A., Hurt, R.T., and Moore, J.E.,
<br />1989x, Hydrogeologic characteristics of the
<br />valley -fill aquifer in [he Arkansas River
<br />valley, Crowley and Otero Counties, Colorado:
<br />U.S. Geological Survey Open -File Report
<br />89 -255, scale 1:62,500, 3 sheets.
<br />--1989b, Hydrogeologic characteristics of the
<br />valley -fill aquifer in the Arkansas River
<br />valley, Prowers County, Colorado: U.S. Geo-
<br />logical Survey Open -File Report 89 -254,
<br />scale 1:62,500, 3 sheeta.
<br />Wilson, W.W., 1965, Peeping testa in Colorado:
<br />Colorado Water Conservation Board Circular
<br />11, 361 p.
<br />CONVERSION FACTORS
<br />The inch -pound units in this report may be
<br />converted to the International System (SI) units
<br />by using the following conversion factors:
<br />Ifultiply BY To obtain
<br />foot .3048 meter
<br />mile• 1.609 kilometer
<br />foot squared .0929 meter ■quoted
<br />per day per day
<br />Sea level: In this report "sea level" refers
<br />to the National Geodetic Vertical Danis of 1929
<br />(NGVD of 1929)--a geodetic datum derived from a
<br />general adjustment of the first -order level nets
<br />of both the United States and Canada, formerly
<br />called "Sea Level Datum of 1929."
<br />EXPIANATION
<br />- -400— RIMX- Kl0M(x)R �Vwue abdirle rfthe is.h�.k
<br />raf_ Conlon ".nol lO last IAiiian h w.. kwrl
<br />APPROXIMATI- I MOT 111 1 Al 1 t 1 111 1 M.4 III I:
<br />- -- I ART OF STt DS ART,,
<br />e DATA POINT
<br />MAP SHOWING M TTRIDF. AND C6NFlGtIRAT10N OF THE BEDROCK SURFACE BENEATH THE VAI I FY I'll I AO(!In-.R
<br />HYDROGEOLOGIC CHARACTERISTICS OF THE VALLEY -FILL AQUIFER IN THE ARKANSAS RIVER VALLEY, PUEBLO COUNTY. COLORADO
<br />by
<br />Gregory A. Nelson. R. Theodore Hurt, and John E. Moore
<br />1989
<br />Plate 1 of 3
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