StoneLake

CR 1000 W

CR 750 N

120

5

80 90

CR 500 N

CR 400 W

Pigeon River

CR 700 N

North Twin Lake

PigeonLake

SouthTwin Lake

Scott

Seyberts

Twin Lakes

Fawn River Fawn River

CedarLake

CR 10

0 E

CR 400 N

Pigeon River Fish And

Wildlife Area

9

Ontario

Howe

80 90

CR 70

0 E

CR 400 N

CR 600 N

CR 750 N

CR 90

0 E

Brighton

3

Fawn River

Wall Lake

CR 11

00 E

80

120

GreenfieldMills

90

T . 38 N.T . 37 N.

CR 75

0 E

Pigeon RiverFish and Wildlife Area

Mongo Reservoir

20Brushy Prairie

Mongo

Pigeon River

East Fly Creek

CR 60

0 E

CR 20

0 E

CR 100 N

PlatoLaGrange

Buck Creek

CR 300 N

9

Shipshewana

ShipshewanaLake

CR 100 N

CR 700 W

20

Cass Lake

CR 1100 W

Little Elkhart River

T . 38 N.T . 37 N.

Emma Creek

CR 900 W

CR 300 S

5

T . 37 N.T . 36 N.

Rowe-Eden Ditch

CR 200 S

CR 400 S

Emma

Emma Lake

CR 100 S

CR 30

0 E

Fish Lake

Co un ty R o a d 300 S

Valentine

East Buck C reek

Fly Creek CR 200 S

Little Turkey Lake

CR 400 S

Mt.Pisgah

Elmira

3

Big Turkey

Lake

Stroh

T . 37 N.T . 36 N.

Blackman Lake

CR 90

0 E

CR 600 S Big Long

Lake

Pretty Lake

SouthMilford

3

T . 36 N.T . 35 N.

R . 11 E. R . 12 E.R . 10 E. R . 11 E.

Nauvoo Lake

Witmer Lake

Atwood Lake

Olin Lake Nature Preserve

Adams Lake

Eddy

9

Woodruff

Oliver Lake

Dallas Lake

Olin Lake

Wolcottville

R . 9 E. R . 10 E.

CR 300 W

Topeka

CR 400 W

CR 500 W

R . 8 E. R . 9 E.

CR 700 S

CR 700 W

CR 600 S

Honeyville

5

CR 1125 W

R . 7 E. R . 8 E.

T . 36 N.T . 35 N.

Scott Mill PondPublic Fishing Area

950

900

840

850

880

89090

0

830

840

850 860

870 900

910

920

950

910

920

930

940

930

R . 11 E. R . 12 E.R . 10 E. R . 11 E.

R . 9 E. R . 10 E.R . 8 E. R . 9 E.

R . 7 E. R . 8 E.

910900

920

930

940

Lake of the Woods

North

Bran

chElk

hart R

iver

7

98

1

7

7

4

3

8

2

2

6

5

8

54

9

6

2

8

11

9

9

9

56

98

7

9

3

4

8

4

98

3

1

3

2

5

2

23

4

5

4

8

3

45

1

2 1

5

6

6

1

7

13

7

6

7

23

7

5 46

6

13

24

1111

11

11 11

13

12

11

11

25

11

33

35

36

23

17

28

10

21

24

32

36

25

33

18

22

16

18

13

15

20

27

20

12

13

34

13

15

14

30

15

14

29

23

36

2825

27

21

24

13

28

24

26

16

34

35

21

24

35 36

32

26

10

33

15

20

34

19

26

12

16

16

15

18

32

2729

33

27

28

16

27

14

21

28

32 35

31

22

25

35

2826

21

25

34

29

15

32

29

17

10

23

22

25

32

29

21

14

33

19

36

27

28

23

33

16

17

25

17

33

21

16

30

27

32

17

23

23

29

21

31

16

17

23

10

3436

27

19

23

21

26

33

23

28

28

15

20

22

15

27

14

27

10

14

26

24

35

28

34

26

20

32

22

33

14

14

20

26

25

22

22

12

28

35

29

25

31

16

35

21

26

36

2324

34

30

35

12

36

26

16

3333

20

16

34

3332

22 23

13

34

36

29

35

10

29

32

20

20

2022

21

36

26

14

25

34

17

21

24

17

22

34

35

14

28

15

14

19

16

29

26

12

17

32

29

10

27

25

34

25

22

14

24

30

12

31

17

27

30

15

31

35

2423

20

24

32

13

31

24

36

36

15

19

13

18

30

29

13

13

17

12

10

22

18

19

20

17

18

31

15

19

31

18

31

18

19

13

30

19

30

30

18

18

30

31

18

19

31

18

31

19

30

30

19

7 8 9 10711 12

900

880

890

870

920

910

860850

840

830

930

820

940

950

960

970

810

960

930

940

930

920

900

930

910

950

820

940

870

910

950

960

Hillshade Map of LaGrange County, Indiana

Map gen erated b y S c o tt H. Dea nIDNR , Divisio n o f Water, R eso urc e Assessm en t S ec tio n

Divisio n o f Water Po ten tio m etric S urfac e Map 04-AMitc hell E. Da n iels, Jr., Go vern o rDepartm en t o f Natural R eso urc es

R o b ert E. Ca rter Jr., Direc to r

POT ENT IOMET R IC S UR FACE MAP OF T HE UNCONS OLIDAT ED AQUIFER S OF LAGR ANGE COUNT Y , INDIANA

Location Map

T his m ap was c reated fro m several existin g shapefiles. T o wn ship an d R an ge Lin es o f In dian a (lin e shapefile, 20020621), Lan d S urvey Lin es o f In dian a (po lygo n shapefile, 20020621), an d Co un ty Bo un daries o f In dian a (po lygo n shapefile, 20020621), were all fro m the In dian a Geo lo gic al S urvey an d b ased o n a 1:24,000 sc ale. Draft ro ad shapefiles, S ystem 1 an d S ystem 2 (lin e shapefiles, 2003), were fro m the In dian a Departm en t o f T ran spo rtatio n an d b ased o n a 1:24,000 sc ale. Po pulated Areas in In dian a 2000 (po lygo n shapefile, 20021000) was fro m the U.S . Cen sus Bureau an d b ased o n a 1:100,000 sc ale. Hydro graphy, S tream s (NHD) (lin e shapefile, 20081218), R ivers (NHD) (po lygo n shapefile, 20081218), Lakes (NHD) (po lygo n shapefile, 20081218) was fro m the U.S . Geo lo gic al S urvey an d the U.S . En viro n m en tal Pro tec tio n Agen c y an d b ased o n a 1:24,000 sc ale. Man aged Lan ds IDNR IN (po lygo n shapefile, 20100920) was fro m IDNR an d b ased o n a 1:24,000 sc ale. Co un ty Hillshade im age was fro m the U.S . Geo lo gic al S urvey Natio n al Elevatio n Dataset (raster im age, 20100324). Po ten tio m etric S urfac e Map o f the Un c o n so lidated Aquifers o f LaGran ge Co un ty, In dian a (lin e shapefiles, Gro ve, 2012) was b ased o n a 1:24,000 sc ale.

Map Use and Disclaimer StatementWe request that the fo llo win g agen c y b e ac kn o wledged in pro duc ts derived fro m this m ap: In dia n a Departm en t o f Natura l R eso urc es, Divisio n o f Water.T his m ap was c o m piled b y staff o f the In dia n a Departm en t o f Natural R eso urc es, Divisio n o f Water usin g da ta b elieved to b e reaso n a b ly ac c ura te. Ho wever, a degree o f erro r is in heren t in all m aps. T his pro duc t is distrib uted “as is” witho ut warran ties o f an y kin d, either expressed o r im plied. T his m ap is in ten ded fo r use o n ly a t the pub lished sc ale.

Potentiometric Surface Map of the Unconsolidated Aquifers of LaGrange County, Indiana

b yGlen n E. Gro ve

Divisio n o f Water, R eso urc e Assessm en t S ec tio n

Feb ruary 2012

LaGran ge Co un ty, In dia n a is lo c ated in the n o rtheastern po rtio n o f the state an d is situated en tirely within the S t. Jo seph R iver Basin . Majo r drain age system s in c lude the Pigeo n R iver, Fawn R iver an d the Little Elkhart R iver alo n g with several trib utaries. T he Po ten tio m etric S urfac e Map (PS M) o f the Un co n so lidated Aquifers o f LaGran ge Co un ty was m apped b y c o n to urin g the elevatio n s o f appro xim ately 4400 static water-levels repo rted o n well reco rds rec eived o ver a 50 year perio d. T hese wells are co m pleted in aquifers at vario us depths, an d typically, un der c o n fin ed c o n ditio n s (b o un ded b y im perm eab le layers ab o ve an d b elo w the water b earin g fo rm atio n ). Ho wever, so m e wells were c o m pleted un der un co n fin ed (n o t b o un ded b y im perm ea b le layers) settin gs. T he po ten tio m etric surfac e is a m easure o f the pressure o n water in a water b earin g fo rm atio n . Water in a n un c o n fin ed aquifer is at atm o spheric pressure an d will n o t rise in a well a b o ve the to p o f the water b earin g fo rm atio n , in c o n trast to water in a c o n fin ed aquifer which is un der hydro static pressure an d will rise in a well a b o ve the to p o f the water b earin g fo rm atio n . S tatic water-level m easurem en ts in in dividual wells used to co n struct c o un ty PS M’s are in dic ative o f the water-level at the tim e o f well co m pletio n . T he gro un dwater level within a n aquifer c o n stan tly fluc tuates in respo n se to rain fall, evapo tran spiratio n , gro un dwater m o vem en t, an d gro un dwater pum page. T herefo re, curren t site spec ific co n ditio n s m ay differ due to lo cal o r seaso n al variatio n s in m easured static water-levels. Because fluc tuatio n s in gro un dwater are typic ally sm all, static water-levels c an b e used to co n struct a gen eralized PS M. Gro un dwater flo w is n aturally fro m areas o f rec harge to ward areas o f discharge. As a gen eral rule, b ut c ertain ly n o t always, gro un dwater flo w appro xim ates the o verlyin g to po graphy an d in tersects the la n d surfa ce at m ajo r stream s. T he o b jec tive in c reatin g c o un ty PS M's is to m ap static water-levels in the upper 100 feet o f un co n so lidated m aterials. If a sec tio n o f a co un ty has few lo c ated wells within the 100 feet in terval, then the static water-levels in wells c o m pleted b etween 100 to 200 feet, if availa b le, are used to co m plem en t the area. Lo catio n al Un iversal T ran sverse Merc ato r (UT M) c o o rdin ates were either physic ally o b tain ed in the field, determ in ed thro ugh address geo co din g, o r repo rted o n water well reco rds; ho wever, the well lo c atio n fo r the m ajo rity o f the water well reco rds used to m ake the PS M were field verified. Elevatio n data were either o b tain ed fro m to po graphic m aps o r a digital elevatio n m o del. Quality c o n tro l/quality assuran c e pro c edures were utilized to refin e o r rem o ve data where erro rs were readily apparen t. Po ten tio m etric surfac e c o n to ur elevatio n s in LaGran ge Co un ty ran ge fro m a high o f appro xim ately 970 feet m ea n sea level (m sl) in the so utheast po rtio n o f the c o un ty, to a lo w o f a b o ut 810 feet m sl in the n o rthwestern c o rn er. Gen eralized gro un dwater flo w directio n appears to b e to the west-n o rthwest in the western an d n o rtheastern po rtio n s o f the c o un ty, an d to the n o rtheast an d so uthwest o ff o f a gro un dwater high in the so utheastern part o f the co un ty. T he c o un ty PS M c an b e used to defin e the regio n al gro un dwater flo w path an d to iden tify sign ifica n t areas o f gro un dwater rec harge an d disc harge. Co un ty PSM’s are in ten ded to represen t o verall regio n al c hara cteristic s an d n o t in ten ded to b e a sub stitute fo r site-spec ific studies.

1 0 10.5 Mile

1 0 10.5 K ilo m eter

Lin e o f equal elevatio n , in feet ab o ve m ean sea levelPo ten tio m etric Co n to ur in terval 10 feet

EXPLANATION

Lake & R iver

Mun ic ipal Bo un dary

US Highway

Co un ty R o ad

S tream

S tate Ma n aged Pro perty

950

In terstate

S tate R o a d

20

9

80