County Geologic Atlas (CGA)

A complete county atlas provides information about the geology and groundwater resources of a county. Most atlases are produced in two parts.

Part A - Geology

The Minnesota Geological Survey produces the Part A atlas, which includes the geology, sand distribution, bedrock topography, and depth to bedrock. The Geologic Atlas User's Guide has a general overview of Minnesota geology and suggestions on how to use a county atlas (27 pages). For the Part A status map see the County Geologic Atlas website.

Part B - Groundwater/Hydrogeology

After Part A is completed, the DNR produces the Part B atlas, which includes maps and reports identifying the direction of groundwater flow, aquifer properties, groundwater chemistry, and pollution sensitivity of aquifers. In older atlases the groundwater information is included in Part A. See the Groundwater Atlas User Guide for an overview of reading Part B (8 pages).

Regional Hydrogeologic Assessment (RHA)

RHAs are larger areas (typically 4-9 counties) covered in less detail than a county atlas and do not include bedrock. These older assessments will be superseded by the county atlases as they are completed. See the RHA page.

Part B Status

Click to enlarge

thumbnail of sample_b

Atlas status by county

Counties are added to the list as they are begun. Paper copies can be obtained from MGS Map Sales.

A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

A -back to top

Aitkin

  • Part A Geology: in progress
  • Part B Groundwater/Hydrogeology: future start

Anoka, C-27

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Becker, C-42

  • Part A Geology: 2016
  • Part B Groundwater/Hydrogeology: in progress

Benton, C-23

  • Part A Geology: 2010
  • Part B Groundwater/Hydrogeology: 2012
    • Plate 6 - Hydrogeology of the Surficial Sand Aquifer (3.0 MB)
    • Plate 7 - Hydrogeologic Cross Sections (5.8 MB)
    • Plate 8 - Hydrogeology of the Buried Aquifers and the Rice Area Aquifer System (3.7 MB)
    • Plate 9 - Sensitivity of Groundwater Systems to Pollution (3.4 MB)
    • GIS files

Blue Earth, C-26

  • Part A Geology: 2011
  • Part B Groundwater/Hydrogeology: 2016
    • Report (22 MB)
    • Plate 7 - Uppermost Bedrock Groundwater Flow Directions and Bedrock Geology (8 MB)
    • Plate 8 - Hydrogeologic Cross Sections (8 MB)
    • Plate 9 - Hydrogeologic Cross Sections (8 MB)
    • GIS files

Brown, C-37

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Carlton, C-19

  • Part A Geology: 2009
  • Part B Groundwater/Hydrogeology: 2011
    • Plate 7 - Hydrogeology of the Surficial Aquifer (5.5 MB)
    • Plate 8 - Hydrogeologic Cross Sections (1.8 MB)
    • Plate 9 - Hydrogeology of the Buried Aquifers (3.7 MB)
    • Plate 10 - Sensitivity of Groundwater Systems to Pollution (5.8 MB)
    • GIS files

Carver, C-21

  • Part A Geology: 2009
  • Part B Groundwater/Hydrogeology: 2014
    • Plate 6 - Quaternary Hydrogeology (3 MB)
      Plate 6 - Quaternary Hydrogeology with LiDAR (41 MB)
    • Plate 7 - Hydrogeologic Cross Sections (6.1 MB)
    • Plate 8 - Bedrock Hydrogeology (6.2 MB)
    • Plate 9 - Pollution Sensitivity (6.1 MB)
    • GIS files

Cass, C-43

Chisago, C-22

Clay, C-29

Crow Wing, C-16

  • Part A Geology: 2004
  • Part B Groundwater/Hydrogeology: 2007
    • Plate 7 - Hydrogeology of the buried and surficial aquifers (11 MB)
    • Plate 8 - Hydrogeologic cross sections (7 MB)
    • Plate 9 - Pollution sensitivity of the buried and surficial aquifers (13 MB)
    • Plate 10 - Interaction of lakes and ground water (7 MB)
    • GIS files

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    Dakota, C-06

    • Part A Geology: 1990
    • Part B Groundwater/Hydrogeology: included in Part A

    Dakota update

    • Part A Geology: in progress
    • Part B Groundwater/Hydrogeology: future start

    Dodge, C-50

    • Part A Geology: 2019
    • Part B Groundwater/Hydrogeology: in progress

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    Fillmore, C-08

    • Part A Geology and C: 1995
    • Part B Groundwater/Hydrogeology: 1996
      • Plate 6 - Bedrock hydrogeology (1.8 MB)
      • Plate 7 - Sensitivity of the St. Peter-Prairie du Chien-Jordan aquifer to pollution (2.3 MB)
      • Plate 8 - Sinkholes and sinkhole probability (600 K)
      • Plate 9 - Springsheds (1.5 MB)
      • GIS files

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    Goodhue, C-12

    • Part A Geology: 1998
    • Part B Groundwater/Hydrogeology: 2003

    H - back to top

    Hennepin, C-45

    • Part A Geology: 2018
    • Part B Groundwater/Hydrogeology: 2021
    • C-04 1989 archived

    Houston, C-33

    • Part A Geology: 2014
    • Part B Groundwater/Hydrogeology: in progress

    Hubbard, C-41

    • Part A Geology: 2018
    • Part B Groundwater/Hydrogeology: in progress

    I - back to top

    Isanti, C-44

    • Part A Geology: 2017
    • Part B Groundwater/Hydrogeology: in progress

    K - back to top

    Kanabec, C-38

    Kandiyohi, C46

    • Part A Geology: 2019
    • Part B Groundwater/Hydrogeology: in progress

    L - back to top

    Lake

    M - back to top

    McLeod, C-20

    • Part A Geology: 2009
    • Part B Groundwater/Hydrogeology: 2013
      • Plate 7 - Hydrogeology (5.8 MB)
      • Plate 8 - Hydrogeologic Cross Sections (3.7 MB)
      • Plate 9 - Pollution Sensitivity of the Near-Surface Materials, Buried Sand and Gravel Aquifers, and the Bedrock Surface (3.4 MB)
      • GIS files

    Meeker, C-35

    Morrison, C-31

    Mower, C-11

    • Part A Geology:1998, RI-50: 2000
    • Part B Groundwater/Hydrogeology: 2002
      • Plate 7 - Bedrock hydrogeology (2.3 MB)
      • Plate 8 - Ground-water flow in bedrock aquifers (800 K)
      • Plate 9 - Sensitivity to pollution of the uppermost bedrock aquifers (1.7 MB)
      • Plate 10 - Karst hydrogeomorphic units (1.2 MB)
      • Technical Appendix - Potentiometric surfaces of the uppermost bedrock aquifers (5.3 MB)
      • GIS files

    N - back to top

    Nicollet, C-25

    Nobles, C-48

    • Part A Geology: 2020
    • Part B Groundwater/Hydrogeology: in progress

    O - back to top

    Olmsted update, C-49

    • Part A Geology: 2020
    • Part B Groundwater/Hydrogeology: in progress
    • C-03 1988 archived

    P - back to top

    Pennington

    • Part A Geology: in progress
    • Part B Groundwater/Hydrogeology: future start

    Pine, C-13

    Pope, C-15

    • Part A Geology: 2003
    • Part B Groundwater/Hydrogeology: 2006
      • Plate 6 - Hydrogeology of the surficial aquifers (4.0 MB)
      • Plate 7 - Hydrogeology of the buried aquifers (2.2 MB)
      • Plate 8 - Hydrogeologic cross sections (3.7 MB)
      • Plate 9 - Sensitivity to pollution of the buried aquifers (6.2 MB)
      • GIS files

    R - back to top

    Ramsey, C-07

    • Part A Geology: 1992
    • Part B Groundwater/Hydrogeology: included in Part A

    Redwood, C-36

    Renville, C-28

    Rice, C-09

    • Part A Geology: 1995
    • Part B Groundwater/Hydrogeology: 1997
      • Plate 7 - Water-table hydrogeology (1.3 MB)
      • Plate 8 - Bedrock hydrogeology (1.8 MB)
      • Plate 9 - Sensitivity of bedrock aquifer systems to pollution (1.5 MB)
      • Plate 9 Supplement - Sensitivity of near-surface aquifers to pollution (354 KB)
      • GIS files

    Rock, C-47

    • Part A Geology: 2020
    • Part B Groundwater/Hydrogeology: in progress

    S - back to top

    St. Louis

    Scott, C-17

    Sherburne, C-32

    Sibley, C-24

    Stearns, C-10

    Part A Geology: 1995 and 1996

    • Plate 1 Data base (1.8Mb)
    • Plate 2 Bedrock geology (1.8Mb)
    • Plate 3 Surficial geology (2Mb)
    • Plate 4 Quaternary stratigraphy (1.8Mb)
    • Plate 5 Depth to bedrock and thickness of Cretaceous strata (1.3Mb)
    • Plate 6 Bedrock topography (1.5Mb)
    • Plate 7 Geologic resources (2Mb)

    Part B Groundwater/Hydrogeology: 1998

    • Plate 8 Hydrogeology of the Quaternary water-table system (shaded relief map not included) (1.4 Mb)
    • Plate 9 Hydrogeology of the Quaternary confined aquifers and bedrock aquifers (2.1Mb)
    • Plate 10 Sensitivity of ground-water systems to pollution (1.8Mb)
    • GIS files

    Buried aquifer supplement and cross sections: 2007

    Steele, C-53

    • Part A Geology: in progress
    • Part B Groundwater/Hydrogeology: future start

    T - back to top

    Todd, C-18

    • Part A Geology: 2007
    • Part B Groundwater/Hydrogeology: 2010
      • Plate 7 - Distribution of the Surficial and Buried Sand Aquifers (5 MB)
      • Plate 8 - Hydrogeologic Cross Sections (1.8 MB)
      • Plate 9 - Hydrogeology of the Surficial and Buried Sand Aquifers (9.6 MB)
      • Plate 10 - Pollution Sensitivity of the Buried Sand Aquifers and the Near-Surface Materials (8.1 MB)
      • GIS files

    W - back to top

    Wabasha, C-14

    • Part A Geology: 2001, RI-59: 2002
    • Part B Groundwater/Hydrogeology: 2005
      • Plate 8 - Hydrogeology of the unconsolidated and bedrock aquifers (1.7 MB)
      • Plate 9 - Hydrogeologic cross sections (2.1 Mb)
      • Plate 10 - Sensitivity to pollution of the uppermost aquifers(2.9 MB)
      • GIS files

    Wadena, C-40

    • Part A Geology: 2016
    • Part B Groundwater/Hydrogeology: in progress

    Washington, C-39

    Winona, C-34

    Wright, C-30

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