Ground-Water Atlas of Colorado Special Publication 53

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Colorado Geological Survey 108' 2� M O F 4 F A T 3 � 9� _ a o� Wn+ f R 1 0 E L A N O G A R F I E L D c 0lOr`Q0 M E S A Grand • -- ' junction E L T A M O S A N M I G U E L D O L)O R E S R O U T T River JACKSON Steamboat* ; S rin G R A N D ^j Riz, by, E A G L Springs � SUMf IT SAN kUA MONTEZUMA Cortez 'Durango. i L A P L A T A f 108' 1 P I T K I N LAKE NN'G O N r. r a E{ rCHAFF E`°= Gunnison. A,.,. INSDALE i S A G U A C H E L A R I M E •: f 7• ` r• p• Fort it Vi 47— Collins Y 111•im l GILPINI Z DEI UD R �° o LC EAR +., nvei , CRETE w c "th I LL LU Fork LL DOU LAS P A R K TELLER F R E M O(Z T CUSTER i r H U R �—� S MINERAL; 1 ALAMOSA r RIO GRANDE Alannosa; r <ARCHULETA C O N E J O S; COSTILLA �� 0 L O G A N SEDGWICK w£ `" ;; •� , �, •S rung P H 4 L L I P S 11`00 ' R nm` 40` Y U M A A D A M S W i A R A P A O • nr?P`pe F'. E L B E R I T C A R S O N f Colorado IJIJ31J311JJ4 Springs E L C H E Y E N N E i P A S O SP 5 .P L I N C O L N from zero where it crops out along the Front._ Range on the western edge of the Denver Paeblo .. A0 4 ground surface near the center of the Denver Basin. The depth is less than 2,000 feet in the f southern part of Colorado on the crests and flanks of the Apishapa and Las Animas •S Arches. It crops out along the margins of t,N•`O. a`.r.° •• 4 PROWERS most of the major sedimentary basins of the state, including the San Juan and Raton Basins. Well permit records filed with the r ZsP• S °• A t IA C A EXPLANATION Trinidad , r•.o ` Dakota — Cheyenne aquifer boundary Dakota - Cheyenne aquifer, list well comple- 104' Water well data from Colorado Division of Water Resources (DWR) 0 100 Miles Figure 6.8 -2. Distribution of water wells by depth within the Dakota - Cheyenne aquifer. r+t J t IJIJ31J311JJ4 GROUND -WATER ATLAS OF COLORADO SP 5 The depth to the top of the aquifer ranges from zero where it crops out along the Front._ Range on the western edge of the Denver Basin, to greater than 9,000 feet below ground surface near the center of the Denver Basin. The depth is less than 2,000 feet in the f southern part of Colorado on the crests and flanks of the Apishapa and Las Animas Arches. It crops out along the margins of most of the major sedimentary basins of the state, including the San Juan and Raton Basins. Well permit records filed with the Colorado Division of Water Resources (DWR), EXPLANATION for wells potentially completed within the Dakota — Cheyenne aquifer boundary Dakota - Cheyenne aquifer, list well comple- Water Well tion depths from very shallow to several Depths in Feet r; 100 -199 thousand feet. The distribution of water well 4 depths is presented in Figure 6.8 -2. 200 -299 • 300 -399 While the name Dakota Sandstone and /or e 400 -499 Dakota Group is used throughout Colorado, • 500 -999 the individual units within the group and • >1000 the overlying shales are named differently in various parts of the state. In eastern Colorado, the Graneros Shale overlies the Dakota Group, forming a confining layer, and con- sists of dark gray to black, fissile, noncalcare- ous shale. In western Colorado, the equiva- lent overlying shale is termed the Mowry Shale. Specific sandstones included in the statewide context of the Dakota - Cheyenne aquifer are the Dakota, Lakota, Burro Canyon, Plainview, Kassler, Muddy, and Cheyenne Sandstones and their equivalents. WATER IEVEIS/AQU/FER CHARACTERISTICS Due to the complexity and extent of the Dakota - Cheyenne aquifer in Colorado it is difficult, if not impossible, to create a single potentiometric surface map for the state. The available ground -water elevation data indicate that ground water typically moves from recharge areas along basin fringes towards the basin centers. A significant amount of discontinuities exist, however, that are both structural and stratigraphic in