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a USGS U.S. DEPARTMENT OF THE INTERIOR

science forachanging world U.S. GEOLOGICAL SURVEY

PROFESSIONAL PAPER 1411-B

Potentiometric surfaces of the Madison and Canyonland aquifers—PLATE 11
Geldon, A, 2002, Hycrologic properties and ground-water flow systems ofthe Paleozoic rocks inthe Upper
Colorado River Basin in Arizona, Colorado, New Mexico, Utah, and ‘Wyoming, excluding the San Juan Basin

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107°

25 50 75 100 MILES
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25 50 75 100 KILOMETERS

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REDWALL-LEADVILLE ZONE OF MADISON AQUIFER

108°

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110° FROM STUDY
108°
1:2,000,000
0 25 50 75 100 MILES
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47 Happy Springs

3° OBrien Springs
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BOUNDARY OF
107° UPPER COLORADO
.. RIVER BASIN

Springs ¢
—=737°
Navajo :

Reservoir Z

AREA EXCLUDED

WEBER-DE CHELLY AND CUTLER-MAROON ZONES OF CANYONLANDS AQUIFER

EXPLANATION

Area where the Redwall-Leadville, Weber-De Chelly, or Cutler-Maroon
zone is missing because of erosion or nondeposition

+ 5.000 Potentiometric contour—Shows altitude at which water level would have stood
in tightly cased wells. Dashed where approximately located. Arrow indicates
direction of ground-water movement assuming the aquifer is isotropic.
Contour interval, in feet, is variable. National Geodetic Vertical Datum of
1929. For the Weber—De Chelly and Cutler-Maroon aquifers, potentiometric
contours south of latitude 37° are based in part on Cooley and others (1969,
fig. 9); Levings and Farrar (1977a, 1977b, 1977c); and Eychaner (1983,
fig. 3); potentiometric contours between Grand Junction and Glenwood
Springs, Colorado, are based in part on topography

Limit of data
—-—-— _ Ground-water divide—Dashed where approximately located
B—— B' Location of hydrogeologic section shown in figures 94 and 98

—i——_ Eastern extent of Weber—De Chelly zone as a fully saturated, productive
hydrogeologic unit—East of this line the Weber-De Chelly zone pinches
out and where present is partially saturated to unsaturated. The principal
productive zone in the Canyonlands aquifer east of the line is the
Cutler-Maroon zone. Heads shown west of the line are for the Weber-De
Chelly zone. Heads shown east of the line are for the Cutler-Maroon zone.
At the line heads in the Weber—De Chelly and Cutler-Maroon zones are
equal, and heads for both zones are shown

Data sites
° Borehole—Static water level is plotted
a Flowing well—Altitude of land surface is plotted if static water level is not
known
? Spring—Altitude of land surface is plotted. Springs with discharges of

1,000 gallons per minute or more are plotted

x Sink—Altitude of land surface is plotted

Base from U.S. Geological Survey
U.S. base map, 1:2,500,000

IN ARIZONA, COLORADO, NEW MEXICO, UTAH, AND WYOMING

By
Arthur L. Geldon
2002

POTENTIOMETRIC SURFACES OF THE MADISON AND CANYONLANDS AQUIFERS IN THE UPPER COLORADO RIVER BASIN AND VICINITY,