County Geologic Atlas (CGA) Series

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 These older assessments will be superseded by the county atlases as they are completed.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

Atlases by county

Access digital files from the list below. Paper copies of atlases printed after 2022 can be obtained from OceanGrafix. Older atlases can be obtained from OceanGrafix or 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

Aitkin, C-52

  • Part A Geology: 2022

  • Part B Groundwater/Hydrogeology: in progress

Anoka, C-27

  • Part A Geology: 2013

  • Part B Groundwater/Hydrogeology: 2016

B

Becker, C-42

  • Part A Geology: 2016

  • Part B Groundwater/Hydrogeology: 2023

Beltrami

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Benton, C-23

  • Part A Geology: 2010

  • Part B Groundwater/Hydrogeology: 2012

    • Plate 6 - Hydrogeology of the Surficial Sand Aquifer

    • Plate 7 - Hydrogeologic Cross Sections

    • Plate 8 - Hydrogeology of the Buried Aquifers and the Rice Area Aquifer System

    • Plate 9 - Sensitivity of Groundwater Systems to Pollution

    • GIS files

Big Stone

  • No atlas

Blue Earth, C-26

  • Part A Geology: 2011

  • Part B Groundwater/Hydrogeology: 2016

    • Report

    • Plate 7 - Uppermost Bedrock Groundwater Flow Directions and Bedrock Geology

    • Plate 8 - Hydrogeologic Cross Sections, A–Aʹ through D–Dʹ

    • Plate 9 - Hydrogeologic Cross Sections, E–Eʹ through H–Hʹ

    • GIS files

Brown, C-37

C

Carlton, C-19

  • Part A Geology: 2009

  • Part B Groundwater/Hydrogeology: 2011

    • Plate 7 - Hydrogeology of the Surficial Aquifer

    • Plate 8 - Hydrogeologic Cross Sections

    • Plate 9 - Hydrogeology of the Buried Aquifers

    • Plate 10 - Sensitivity of Groundwater Systems to Pollution

    • GIS files

Carver, C-21

  • Part A Geology: 2009

  • Part B Groundwater/Hydrogeology: 2014

Cass, C-43

Chippewa

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Chisago, C-22

Clay, C-29

  • Part A Geology: 2014

  • Part B Groundwater/Hydrogeology: 2018

Clearwater

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Cook

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Cottonwood

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Crow Wing, C-16

  • Part A Geology: 2004

  • Part B Groundwater/Hydrogeology: 2007

    • Plate 7 - Hydrogeology of the buried and surficial aquifers

    • Plate 8 - Hydrogeologic cross sections

    • Plate 9 - Pollution sensitivity of the buried and surficial aquifers

    • Plate 10 - Interaction of lakes and ground water

    • GIS files

D

Dakota, C-57

  • Part A Geology: 2023

  • Part B Groundwater/Hydrogeology: in progress

  • (C-06 1990 archived)

Dodge, C-50

Douglas

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

F

Faribault

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Fillmore, C-08

  • Part A Geology and C: 1995

  • Part B Groundwater/Hydrogeology: 1996

    • Plate 6 - Bedrock hydrogeology

    • Plate 7 - Sensitivity of the St. Peter-Prairie du Chien-Jordan aquifer to pollution

    • Plate 8 - Sinkholes and sinkhole probability

    • Plate 9 - Springsheds

    • GIS files

Freeborn

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

G

Goodhue, C-12

Grant

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

H

Hennepin, C-45

  • Part A Geology: 2018

  • Part B Groundwater/Hydrogeology: 2021

  • (C-04 1989 archived)

Houston, C-33

Hubbard, C-41

I

Isanti, C-44

Itasca

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

J

Jackson

  • No atlas

K

Kanabec, C-38

Kandiyohi, C-46

  • Part A Geology: 2019

  • Part B Groundwater/Hydrogeology: in progress

Kittson

  • No atlas

Koochiching

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

L

Lac qui Parle, C-65

  • Part A Geology: 2023

  • Part B Groundwater/Hydrogeology: in progress

Lake, C-54

  • Part A Geology: 2022

  • Part B Groundwater/Hydrogeology: in progress

Lake of the Woods

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Le Sueur

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Lincoln, C-58

  • Part A Geology: 2023

  • Part B Groundwater/Hydrogeology: in progress

Lyon

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

M

Mahnomen

  • No atlas

Marshall

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Martin

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

McLeod, C-20

  • Part A Geology: 2009

  • Part B Groundwater/Hydrogeology: 2013

    • Plate 7 - Hydrogeology 

    • Plate 8 - Hydrogeologic Cross Sections

    • Plate 9 - Pollution Sensitivity of the Near-Surface Materials, Buried Sand and Gravel Aquifers, and the Bedrock Surface

    • GIS files

Meeker, C-35

Mille Lacs

  • No atlas

Morrison, C-31

  • Part A Geology: 2014

  • Part B Groundwater/Hydrogeology: 2019

Mower, C-11

Murray

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

N

Nicollet, C-25

Nobles, C-48

  • Part A Geology: 2020

  • Part B Groundwater/Hydrogeology: in progress

Norman

  • No atlas

O

Olmsted, C-49

  • Part A Geology: 2020

  • Part B Groundwater/Hydrogeology: in progress

  • C-03 1988 archived

Otter Tail, C-55

  • Part A Geology: 2023

  • Part B Groundwater/Hydrogeology: in progress

P

Pennington

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Pine, C-13

Pipestone, C-59

  • Part A Geology: 2024

  • Part B Groundwater/Hydrogeology: in progress

Polk

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Pope, C-15

  • Part A Geology: 2003

  • Part B Groundwater/Hydrogeology: 2006

    • Plate 6 - Hydrogeology of the surficial aquifers

    • Plate 7 - Hydrogeology of the buried aquifers

    • Plate 8 - Hydrogeologic cross sections

    • Plate 9 - Sensitivity to pollution of the buried aquifers

    • GIS files

R

Ramsey, C-07

  • Part A Geology: revision in progress

  • Part B Groundwater/Hydrogeology: future start

  • (C-07 1992 archived)

Red Lake

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Redwood, C-36

Renville, C-28

Rice, C-09

  • Part A Geology: 1995

  • Part B Groundwater/Hydrogeology: 1997

    • Plate 7 - Water-table hydrogeology

    • Plate 8 - Bedrock hydrogeology

    • Plate 9 - Sensitivity of bedrock aquifer systems to pollution

    • Plate 9 Supplement - Sensitivity of near-surface aquifers to pollution

Rock, C-47

  • Part A Geology: 2020

  • Part B Groundwater/Hydrogeology: in progress

Roseau

  • No atlas

S

Scott, C-17

  • Part A Geology: revision in progress

  • Part B Groundwater/Hydrogeology: future start

  • (C-01 1982; C-17 2006, 2008 archived)

Sherburne, C-32

Sibley, C-24

Stearns, C-10

Part A Geology: 1995 and 1996

Part B Groundwater/Hydrogeology: 1998

  • Plate 8 Hydrogeology of the Quaternary water-table system (shaded relief map not included) 

  • Plate 9 Hydrogeology of the Quaternary confined aquifers and bedrock aquifers

  • Plate 10 Sensitivity of ground-water systems to pollution

  • GIS files

Buried aquifer supplement and cross sections: 2007

Steele, C-53

  • Part A Geology: 2022

  • Part B Groundwater/Hydrogeology: in progress

Stevens

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Swift

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

T

Todd, C-18

  • Part A Geology: 2007

  • Part B Groundwater/Hydrogeology: 2010

    • Plate 7 - Distribution of the Surficial and Buried Sand Aquifers

    • Plate 8 - Hydrogeologic Cross Sections

    • Plate 9 - Hydrogeology of the Surficial and Buried Sand Aquifers

    • Plate 10 - Pollution Sensitivity of the Buried Sand Aquifers and the Near-Surface Materials

    • GIS files

Traverse

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

W

Wabasha, C-14

  • Part A Geology: 2001, RI-59: 2002

  • Part B Groundwater/Hydrogeology: 2005

    • Plate 8 - Hydrogeology of the unconsolidated and bedrock aquifers

    • Plate 9 - Hydrogeologic cross sections

    • Plate 10 - Sensitivity to pollution of the uppermost aquifers

    • GIS files

Wadena, C-40

Waseca

  • Part A Geology: in progress

  • Part B Groundwater/Hydrogeology: future start

Washington, C-39

  • Part A Geology: 2016

  • Part B Groundwater/Hydrogeology: 2019

  • (C-05 1990 archived)

Watonwan

  • No atlas

Wilkin

  • No atlas

Winona, C-34

Wright, C-30

  • Part A Geology: 2013

  • Part B Groundwater/Hydrogeology: 2018

Y

Yellow Medicine

  • Part A Geology: 2025

  • Part B Groundwater/Hydrogeology: future start

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