Ground-Water Levels in Illinois Through 1961

Abstract

. Introduction Scope of report Well-numbering system Acknowledgments Climate . Geology and hydrology Ground-water levels Short-term fluctuations Seasonal and secular fluctuations Water levels in wells remote from pumping centers Water levels in wells within pumping centers Water levels in selected pumping centers Chicago region East St. Louis area References Appendix A Locations of observation wells (Figs. 43-51) Table 1. County abbreviations used in well-numbering system ......... Appendix B Records of observation wells Table 2. Records of wells in northeastern Illinois Table 3. Records of wells in northwestern Illinois Table 4. Records of wells in east-central Illinois Table 5. Records of wells in west-central Illinois Table 6. Records of wells in southeastern Illinois Table 7. Records of wells in southwestern Illinois Appendix C Hydrographs for observation wells remote from pumping centers C-1. Northeastern Illinois (Figs. 52-62) C-2. Northwestern Illinois (Fig. 63) C-3. East-central Illinois (Fig. 64) C-4. West-central Illinois (Figs. 65-66) C-5. Southeastern Illinois (Fig. 67) C-6. Southwestern Illinois (Figs. 68-71) Appendix D Hydrographs for observation wells within pumping centers ..... D-1. Northeastern Illinois (Figs. 72-94) D-2. East-central Illinois (Fig. 95) D-3. Northwestern Illinois (Figs. 96-103) D-4. Southeastern Illinois (Fig. 104) D-5. Southwestern Illinois (Figs. 105-108) 1 1 2 2 2 3 3 10 10 13 13 17 17 17 22 26 27 27 31 31 34 35 35 35 36 37 37 39 39 40 40 41 42 42 48 48 50 51 Figure I L L U S T R A T I O N S Page 1 Average annual precipitation 3 2 Annual precipitation at St. Louis, Peoria, Chicago, and Cairo, 1856-1957 4 3 Frequency of annual maximum and minimum precipitation ......... 5 4 Mean January and July temperatures. 6 5 Generalized bedrock geology 7 6 Sandstone aquifers . 8 .