21

4

22

15

62

8

1210

11

9

5

14

1

17

19

73

1620

1318

9

Linn

Sac

Lee

Ida

Tama

Sioux

Polk

Clay

Iowa

Lyon

Kossuth

Cass

Jasper

Story

Page

Adair

Clayton

Fayette

Benton

Clinton

Cedar

Butler

Dallas

Jones

Mills

Plymouth

Davis

Floyd

Scott

Wright

Boone

Webster

Taylor

Monona

Shelby

HardinWoodbury

Carroll

Marion

OBrien

Harrison

Warren

Guthrie

Greene

Wayne

Crawford

Jackson

Keokuk

Henry

UnionLucas

Franklin

Johnson

Decatur

CalhounDubuque

Pottawattamie

Grundy

Marshall

Clarke

Worth

Madison

Hancock

Mahaska

Hamilton

Allamakee

Palo Alto

Delaware

Louisa

Fremont

Howard

Adams

Cherokee

Mitchell

Bremer

Ringgold

WinneshiekEmmet

Monroe

Buchanan

Wapello

Poweshiek

Black Hawk

Osceola

PocahontasBuena Vista

Audubon

Washington

Van Buren

Chickasaw

Jefferson

Cerro Gordo

Appanoose

Humboldt

Muscatine

Dickinson

Des Moines

Winnebago

Montgomery

Des MoinesAdelLogan

Onawa Boone

Osage

HarlanNewton

Nevada Toledo

Vinton

Eldora

AlgonaGarner

Sibley

Waukon

Cresco

Bedford Corydon

Red OakCorning

CrestonOttumwa

Wapello

Audubon

Marengo

DenisonCarroll

Clinton

Anamosa

Le Mars

Dubuque

WaverlyAllison

Spencer

Decorah

Clarinda

Glenwood

Chariton

Atlantic

Sac CityWaterloo

Mount Ayr Keosauqua

Fairfield

Knoxville OskaloosaIndianola

Muscatine

MontezumaDavenport

Iowa City

Jefferson

Ida Grove

Maquoketa

Northwood

Burlington

GreenfieldWashington

Sioux CityFort Dodge

Storm Lake

Manchester

Emmetsburg

West Union

Mason City

Centerville

Dakota City

Orange City

Forest City

Rock RapidsEsthervilleSpirit Lake

Fort Madison

Marshalltown

Cedar Rapids

Webster City

Grundy Center

Mount Pleasant

Council Bluffs

Leon

Albia

Sidney

Tipton

Osceola

Clarion Hampton

Elkader

Cherokee

Primghar

Winterset

Sigourney

Bloomfield

Pocahontas

New Hampton

Independence

Charles City

Rockwell City

Guthrie Center

80

680

35

380

280235

29

52

169

20

151

30

18

75

34

61

65

59

71

69

218

63

275

67

61

63

71

52

52

75

69

63

59

69

169

65

59

151

218

71

65

69

136

64

3

31

62

76

140

130

13

439

12

10

141

15

148

93

281

149

2

183

21

38

57

5

14

210

92

175

48

16

1

17

25

78

7

188

56

22

330

346

212

187150

83

26

191

70

27

37146

117

96

316

415

28

196

51

173

143

110

8

137

9

370

81

38

7

175

16

10

202

21

14

141

2

13

17

141

12

4

149

150

4

21

175

28

7

175

25

15

10

78

80

80

35

35

9

218

218

86

71

9

18

76

18

9

9

52

61

52

136

1

1486

34

169

69

14

5

65

151

60

20

20

30

263

5

18

63

85

61

34

34

1

141

144

44

169 65

3

44

30

29

29

163

34

92

92218

92

Illinois

Missouri

Minnesota

Nebraska

Wisconsin

South Dakota

Iowa Soil Regions

LegendSoil Regions

1 Loess over glacial till - low rainfall

2 Northwest Iowa Loess

3 Tazewell Glacial Till

4 Loamy Wisconsin Glacial Till

5 Clayey Lake Deposits

6 Iowan Erosion Surface

7 Shallow to Bedrock

8 Loess with Bedrock Outcrops

9 Shallow Loess over Glacial Till

10 Loess Ridges and Sideslopes

11 Loess with exposures of Glacial Till

12 Very Deep Loess

13 Missouri River Bluffs

14 Missouri River Alluvium

15 Loess Ridges/Glacial Till - SW Iowa

16 Loess, Shale, and Glacial Till

17 Loess Ridges/Glacial Till - SE Iowa

18 Eolian Sand

19 Loess - Timbered

20 Alluvium

21 Loess Ridges/Glacial Till Sideslopes

22 Loess Ridges/Clay Paleosol

23 Water

0 25 50 7512.5Miles