94°30' W. 94°45' W. 94°15' W. 94° W. 44°15' N. 44°22'30" N. North Mankato Nicollet Courtland Lafayette St. Peter ) 169 14 14 99 ) 22 111 15 4 22 169 ) ) ) ) Fort Ridgely State Park E F F’ E’ B’ A A’ B C D D’ C’ E F E’ F’ D’ B’ A A’ B C D C’ Symbols Part B line of cross section shown on this plate Well used to generate cross section A A’ Part A line of cross section A A’ 1 0 1 2 3 4 SCALE 1:300 000 1012 45678 3 9 KILOMETERS 5 MILES _j g1 g2 p_u _e st et _tc _tc lower lh tt mt sg2 g1 uh tt Op _m g2 _w ss lh ups _sl st 25 24,000 North Mankato US Hwy 14 Minnesota River 146 1.41 Recharge zone F 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 Elevation (feet) 300 250 200 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 300 250 200 350 F’ ups et g2 sg1 sm _e st mt _tc _tc lower st _j ups tt lh lh g1 p_u tt _sl Kd Kd st mt g1 tt ups sb uh Ka mt sg1 sh g1 _w ss ss bt sh sge _e uh g1 tt sm sge g2 uh sg2 sb lh Kd tt _m sg1 18 126 311 14.3 44.2 1390 18,000 800 825 850 Seven Mile Creek US Hwy 14 Swan Lake Nicollet Courtland Swan Lake Outlet Minnesota River Minnesota River <500 E 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 Elevation (feet) 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 E’ _m mt Op _j sg1 lh _m tt ss mt _w st sg1 _e sh tt g1 lh sm tt _e lh ss tt mt sh tt bt Ka Ka mt st sg1 _sl uh p_u ups mt sm g2 Ka sh ups mt st g1 sb _tc _tc lower g2 Ka sm 17.6 25.1 7.81 13.8 189 1030 10.3 460 790 900 850 775 800 825 775 850 875 800 875 900 825 Heymans Creek Swan Lake Middle Lake St. Peter Minnesota River Minnesota River Recharge zone Recharge zone D 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 Elevation (feet) 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 D’ ss st sg2 tt vt ups sm sg2 g2 g1 Ka sg1 _m lh ups ss sm g1 ups _tc _tc lower ups p_u tt Ka sh st mt st _j ups _sl ups st g2 mt sm ss g2 ups sh sg2 sg1 _e sm mt st tt g1 tt g1 sh Op g2 _w sge g2 uh 5.84 10.6 48.7 8.9 22,000 8000 100 17 165 22.8 6.4 191 204 1820 1670 800 825 775 800 750 State Hwy 111 Minnesota River State Hwy 15 State Hwy 22 Minnesota River St. Peter Erickson Lake Recharge zone C 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 Elevation (feet) 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 C’ sh uh p_u st ss ss _m sm sv sg2 ups ups sm vt _tc g1 sh _e g1 sg1 sg1 sm sh sg2 vt sge tt g2 lh lh lh Ka _w _j tt uh _sl tt g2 sm sge mt mt ups sm ups Op sm _tc lower sh mt sg1 ss Kd st sv ups st ups 5.58 22,000 1130 9.28 19.5 216 140 182 540 21 860 152 4000 7000 775 800 825 800 State Hwy 15 Minnesota River State Hwy 111 Minnesota River State Hwy 22 Eight Mile Creek Recharge zone B 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 Elevation (feet) 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 B’ _e sge suu g3 sge lh g2 _tc ups sh _sl g3 sh g1 sg2 lh g2 ss g2 Ka sh sg2 sg1 lh lh uh uh uh uh sm Kd sv sv vt sv lh sg1 tt mt mt suu Kd tt sm sg1 Kr Kr st ups g1 tt ss sg1 suu g1 mt g1 Ka tt sg1 vt Kd sg1 mt ups _e st ups g1 _w tt tt _m ups p_u lh 9.9 9.9 311 490 7 19.3 570 970 1150 25.6 875 800 900 775 875 825 850 825 State Hwy 4 Minnesota River Clear Lake State Hwy 22 Lafayette Little Rock Creek Minnesota River _tc lower A 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 Elevation (feet) 1050 1100 1000 950 900 850 800 750 700 650 600 550 500 450 400 350 A’ 1 0 1 2 3 4 5 MILES 1 0 1 2 4 5 6 7 8 3 9 KILOMETERS SCALE 1:100 000 VERTICAL EXAGGERATION X 50 uh sh/sv lh,vt sm mt st tt sb bt sg1 g1 sg2 g2 sge et suu Undifferentiated sediment (ups) ss Aquifers and aquitards grouped by stratigraphy Quaternary unconsolidated sediment (see figure 4 for geologic unit correlation) Quaternary aquitards Grouped by texture ranging from highest to lowest sand content, indicating relative hydraulic conductivity. Lighter shades of gray represent units with higher hydraulic conductivity and darker shades of gray have lower hydraulic conductivity. Surficial sand and gravel Buried aquifers and aquitards Hydrogeologic unit code Percent sand Bedrock Dakota Unnamed Saprolith Prairie du Chien Jordan St. Lawrence Formation Upper Tunnel City Lower Tunnel City Group Wonewoc Eau Claire Formation Mt. Simon Precambrian crystalline bedrock _j Op _e _tc lower _w _tc _sl p_u Kd Ka Kr _m mt, tt g2, lh, vt bt, g1, uh, et >50% and ≤60% >40% and ≤50% >30% and ≤40% Groundwater flowpath is unknown (deep groundwater, recent or mixed tritium age). Groundwater flows laterally. Groundwater moves from an overlying buried aquifer to an underlying buried aquifer. Groundwater conditions Water from the surface moves through a thin layer of overlying fine-grained material to an underlying aquifer. Groundwater moves from an overlying surficial aquifer to a buried aquifer. If shown, chloride concentration equals or exceeds 5 parts per million. 9.9 If shown, nitrate-nitrogen concentration equals or exceeds 1 part per million. 8.9 If shown, groundwater residence time in years, estimated by carbon-14 ( 14 C) isotope analysis 4000 Symbols and labels Land or bedrock surface General groundwater flow direction Geologic contact Approximate equipotential contour; contour interval 25 feet 900 Water table Tritium age Darker color in small vertical rectangle (well screen symbol) indicates tritium age of water sampled in well. Lighter color indicates interpreted age of water in aquifer. Mixed: water is a mixture of recent and vintage (greater than 1 TU to less than 8 TU). Well not sampled for tritium. Enhanced-permeability zone Vintage: water entered the ground before 1953 (less than or equal to 1 TU). Recent: water entered the ground since about 1953 (8 to 15 tritium units [TU]). CROSS SECTION EXPLANATION Interpreted tritium age is indicated by background color Interpreted tritium age is indicated by pattern color Groundwater discharge to a surface-water body. Groundwater movement is out of cross section. If shown, arsenic concentration equals or exceeds 5 parts per billion. 5.4 If shown, manganese concentration equals or exceeds 100 parts per billion. 273 LOCATION DIAGRAM GEOLOGIC ATLAS OF NICOLLET COUNTY, MINNESOTA The DNR Information Center Minnesota Department of Natural Resources Ecological and Water Resources Division 500 Lafayette Road St. Paul, MN 55155-4025 For more information call 651-296-6157 or 888-646-6367 http://www.mndnr.gov/waters This information is available in alternative format on request. The Minnesota DNR prohibits discrimination in its programs and services based on race, color, creed, religion, national origin, sex, public assistance status, age, sexual orientation or disability. Persons with disabilities may request reasonable modifications to access or participate in DNR programs and services by contacting the DNR ADA Title II coordina- tor at [email protected] or 651-259-5488. Discrimination inquiries should be sent to Minnesota DNR, 500 Lafayette Road, St. Paul, MN 55155-4049; or Office of Civil Rights, U.S. Department of the Interior, 1849 C Street NW, Washington, DC 20240. © 2016, State of Minnesota, Department of Natural Resources and the Regents of the University of Minnesota This map was compiled and generated in a geographic information system (GIS). Digital data products, including chemistry data, are available from the Minnesota Department of Natural Resources (DNR) Ecological and Water Resources Division at http://www.mndnr.gov/waters. This map was prepared from publicly available information. Every reasonable effort has been made to ensure the accuracy of the factual data on which this map interpretation is based. How- ever, the DNR does not warrant the accuracy, completeness, or any implied uses of these data. Users may wish to verify critical information; sources include both the references in the report and information on file in the offices of the Minnesota Geological Survey and the DNR. Every effort has been made to ensure the interpretation shown conforms to sound geologic and carto- graphic principles. This map should not be used to establish legal title, boundaries, or locations of improvements. Base modified from Minnesota Geological Survey, Nicollet County Geologic Atlas, Part A, 2012. Universal Transverse Mercator projection, zone 15N, North American Datum of 1983. North American Vertical Datum of 1988. GIS and cartography by Vanessa M. Baratta and Holly Johnson. Edited by Ruth MacDonald. COUNTY ATLAS SERIES NICOLLET COUNTY Atlas C-25, Plate 8 of 8 Hydrogeologic Cross Sections Prepared and published with the support of the MINNESOTA ENVIRONMENT AND NATURAL RESOURCES TRUST FUND and the CLEAN WATER, LAND AND LEGACY AMENDMENT STATE OF MINNESOTA DEPARTMENT OF NATURAL RESOURCES ECOLOGICAL AND WATER RESOURCES DIVISION Hydrogeologic Cross Sections By Vanessa M. Baratta and Todd A. Petersen 2016