ATLANTIC OCEAN

LOWER

NEW YORK

BAY

UPPER

NEW YORK

BAY

SMITHTOWN

BAY

JAMAICA

BAY

EAST

RIVER

NORTHPORT

BAY

HUNTINGTON

BAY OYSTER

BAY

HARBOR

MANHASSET 

BAY

LITTLE

NECK

BAY

COLD

SPRING

HARBOR

HEMPSTEAD 

HARBOR

FLUSHING

BAY

HUDSON

RIVER

EAST

BAY

LONG

ISLAND

SOUND

NICOLL

BAY

LONG ISLAND SOUND

ATLANTIC OCEAN

BLOCK ISLAND 

SOUND

GARDINERS

BAY

GREAT

PECONIC

BAY

NAPEAGUE

BAY

LITTLE

PECONIC

BAY

NOYACK

BAY

MORICHES

BAY

SHINNECOCK

BAY

NORTHWEST

HARBOR

THREE

 MILE 

HARBOR

ORIENT

HARBOR

SOUTHOLD

BAY

HOG

NECK

BAY

CUTCHOGUE

HARBOR

MECOX

BAY

FLANDERS

BAY

TIANA

BAY

BELLPORT 

BAY PATCHOGUE 

BAY

GREAT SOUTH BAY

SOUTH

OYSTER

BAY

SHELTER ISLAND SOUND

Long Island Expwy

Middle Country Rd

Sunrise Hwy

Will ai m F ol yd Pkwy

Middle Country Rd

Long Island Expwy

Sunrise Hwy

West Main St

Main Rd

Main Rd

Main Rd

Sunrise Hwy

Montauk Highway

Montauk Hwy

Montauk Hwy

Montauk H wy

Medford Rd

Patchogue - Yaphank Rd

Nesconset Rd

Patchogue - Port Jefferson Rd

Main St

Rocky Po ni t Rd

Sound Ave

Sound Avenue

Parker Road

Nugent Dr

Moriches - Riverhead Rd

Roanoke Ave

East Main St

Cross River Dr

Riverhead - Quogue Rd

Sound Ave

Montauk Hwy

Port Jefferson - West Hampton Rd

O dl R vi erhead Rd

Lewis Rd

Montauk Hwy

Riverhead - Hampton Bays Rd

Montauk Hwy

(Hill St)

Ferry Rd

South Ferry Rd

Hampton St

Sag Harbor Tpke

Main St

William

Floyd Pkwy

Yaphank -

M di dle Island Rd

Gowanus Expwy

Belt Pkwy

(Shore Pkwy)

Belt Pkwy

(Shore Pkwy)

Belt Pkwy

(Shore Pkwy)

Belt Pkwy

Van Wyck Expwy

Cross Is al nd Pkwy Sunrise Hwy

Southern State Pkwy

Brooklyn - Queens Expressway

Long Island Expwy

Queens Blvd

Grand Central Pkwy

Whitestone Expwy

Van Wyck Expwy

Linden Blvd

Clearview Expwy

Cross Island Pkwy

Jericho Tpke

Long Island Expwy

Mead owbrook State Pkwy

Jericho Turnpike

Jericho Tpke

Long Island Expwy

Wantagh State Pkwy

Seaford - Oyster Bay Expwy

Northern State Pkwy

Loop Pkwy

Meadowbrook State Pkwy

Sunrise Hwy

Ocean Pkwy

Wantagh State Pkwy

Southern State Pkwy

Southern State Pkwy

Sunrise Hwy

Ocean Pkwy

Robert Moses Twin Causeway

Jericho Tpke

Northern State Pkwy

Long Island Expwy

Sunken Meadow State Pkwy

Sagt ki os State Parkway

Southern State Pkwy

Heckscher State Pkwy

Long Island Expwy

Middle Country Rd

Ocean Pkwy

Kings Highway

Flatbush Ave

Prospect Ave

Flatbush Avenue

Broadway

Eastern Parkway

Bay Pkwy

Northern Blvd

Woodhaven Blvd

Union Tpke Myrtle Ave

Myrtle Ave

Cross Bay Blvd

Rockaway Blvd Linden Blvd

Hillside Ave Rockaway Blvd

Merrick Blvd

Utop ai Pkwy

Northern Blvd

Northern Blvd

M di d el Neck

Franklin Ave

Hempstead Tpke

Merrick Rd

Lido Blvd

Peninsula Blvd

Merrick Rd

Newbr di ge Rd

Hempstead Tpke

Port Washington Blvd

Hicksville Rd

Northern Blvd

Jer ci ho - Oys et r Bay Rd

Cedar Swamp Rd

Montauk Hwy

New York Ave

Deer Park Ave

New York Ave

Northern Blvd

NorthernBlvd

Elwood Rd

Wheeler Rd

Hauppauge Rd

North Country Rd

Nesconset - Port Jefferson Hwy

Stony Brook Rd

Car el ton Ave

Smithtown Ave

Montauk Hwy

Sunrise Hwy

Veterans Memorial Hw

No

y

rthern State Pkwy

Jamaica Ave

Hillside Ave

Union Tpke

Grand Central Pkw

Lo

y

ng Island Expwy

Rd

Veterans Memorial Hwy

NEW YORK

NEW YORK

COUNTY

HUDSON

COUNTY

BRONX COUNTY

RICHMOND

COUNTY

WESTCHESTER

COUNTY

KINGS

COUNTY

QUEENS

COUNTY

NEW YORK

NEW JERSEY

NEW YORK

NEW JERSEY

NEW YORK

NEW YORK COUNTY

SUFFOLK COUNTY

KINGS COUNTY

NEW YORK COUNTY

QUEENS COUNTY

BRONX COUNTY

QUEENS COUNTY

NASSAU COUNTY

BRONX COUNTY

WESTCHESTER COUNTY

BRONX COUNTY

WESTCHESTER COUNTY

NASSAU COUNTY

CONNECTICUT

NEW YORK

FAIRFIELD COUNTY

NASSAU COUNTY

CONNECTICUT

SUFFOLK COUNTY

NASSAU COUNTY

SUFFOLK COUNTY

NASSAU COUNTY SUFFOLK COUNTY

NASSAU COUNTY

NASSAU COUNTY

QUEENS COUNTY

QUEENS COUNTY

NASSAU COUNTY

QUEENS COUNTY

KINGS COUNTY

KINGS COUNTY

QUEENS COUNTY

NEW YORK COUNTY

HUDSON COUNTY RICHMOND COUNTY KINGS COUNTY

NASSAU 

COUNTY

SUFFOLK COUNTY

CONNECTICUT

NEW HAVEN COUNTY

NEW JERSEY

NEW YORK

NEW JERSEY

NEW YORK

-72°

-72°

-72°30'

-72°30'

-73°

-73°

-73°30'

-73°30'

-74°

-74°

41°10'

41°

40°50'

40°50'

40°40'

40°30'

2 0 2 4 6 8 10 MILES

2 0 2 4 6 8 10 KILOMETERS

SCALE 1:125 000

Hydrology by Michael Como and Ronald Busciolano

By

Michael D. Como, Jason S. Finkelstein, Simonette L. Rivera, Jack Monti, Jr., and Ronald Busciolano

2018

Water-Table and Potentiometric-Surface Altitudes in the Upper Glacial, Magothy, and Lloyd Aquifers of Long Island, New York, April–May 2016

Prepared in cooperation with the 

Manhasset-Lakeville Water District

New York State Department of Environmental Conservation

Sands Point Water Department

Suffolk County Water Authority

Town of Shelter Island

Nassau County Department of Public Works

Port Washington Water District

Suffolk County Department of Health Services

Town of North Hempstead

Water Authority of Great Neck North

Scientific Investigations Map 3398

Sheet 1 of 4

Pamphlet accompanies map

U.S. Department of the Interior

U.S. Geological Survey

Base modified from U.S. Geological Survey digital data 1:100,000 series

Coordinate reference system: NAD_1983_StatePlane_New_York_Long_Island_FIPS_3104_Feet 

WKID: 2263 Authority: EPSG. Horizontal datum is North American Datum of 1983 

If this map is printed on an electronic plotter directly from digital files, dimensional calibration may vary

between X and Y directions on the same plotter, and paper may change size due to atmospheric conditions; 

therefore, scale and proportions may not be true on plots of this map.

Director, New York Water Science Center, U.S. Geological Survey, 2045 Route 112, Building 4, Coram, NY 11727

or visit our website at https://ny.water.usgs.gov

Digital files are available at https://doi.org/10.3133/sim3398

Any use of trade, firm, or product names in this publication is for descriptive purposes only and does not 

imply endorsement by the U.S. Government.

For additional information about this publication, contact:

Como, M.D., Finkelstein, J.S., Rivera, S.L., Monti, Jack, Jr., and Busciolano, Ronald, 2018, 

 Water-table and potentiometric-surface altitudes in the upper glacial, Magothy, and Lloyd aquifers of 

 Long Island, New York, April–May 2016: U.S. Geological Survey Scientific Investigations Map 3398, 4 sheets, 

 scale 1:125,000, 5-p. pamphlet, https://doi.org/10.3133/sim3398.

Suggested citation: 

ISSN 2329-132X (online)

https://doi.org/10.3133/sim3398

NEW YORK

CONNECTICUT

NEW JERSEY

Long Island

ATLANTIC OCEAN

20 0 20 KILOMETERS

20 0 20 MILES

Inset A

1 0 1 2 3 4 5 MILES

1 0 1 2 3 4 5 KILOMETERS

SUFFOLK COUNTY

No data

-72° -71°55'

41°16'

41°14'

Inset A

Plum Island

Gardiners Island

Fishers Island

Water-table contour—Shows altitude of water table, 

 April–May 2016. Solid where approximately known; 

 dashed where inferred. Contour interval is variable. Datum is NGVD 29

20

S 58922

2.55

Monitoring well—Green circle indicates observation well screened 

 in the upper glacial aquifer; green circle with thick border indicates 

 supply well screened in the upper glacial aquifer; red circle indicates 

 observation well screened in the Magothy aquifer. Upper number 

 is well number assigned by the New York State Department of 

 Environmental Conservation; lower number is water-table altitude in 

 feet, NGVD 29

EXPLANATION

400 feet 

0 feet 

Land surface topography—Shows land surface altitude in feet, NAVD 88

300

200

100

# Streamgage or Lake level—Black triangle indicates streamgage; green 

 triangle with black border indicates lake level gage. Upper number is 

 downstream order number assigned by the U.S. Geological Survey; 

 lower number is altitude of water in the stream or lake in feet, NGVD 29 

01305000

19.25

Water-table groundwater divide—Shows approximate location of the

 regional groundwater divide for the water table. Conditions will vary 

 locally due to variations in geology

20

60

10

40

50

60

70

80

60

80

10

50

30

10

20

30

60

30

30

40

50

10

70

10

20

70

40

50

10

100

10 20

20

?

10

30

40

50

60

80

70

60

40

30

20

10

70

60

50

40

30

20

10

70

40

30

20

10

50

20

10

70

50

40

30

20

10

70

60

50

40

30

20

10

60

50

40

30

20

10

30

30

10

40

20

20

?

?

?

?

?

?

?

? ?

5

5

S 71785

34.38

N 9059

79.00

N 8309

41.50

N 1195

77.60

S 98651

38.30

N 1243

54.36

N 2635

26.32

N 9089

80.14

N 9983

47.35

S 74286

71.17

N 10608

69.43

N 10607

74.99

N 1615

39.16

S 72782

3.00

S 2485

33.00

S 8831

6.30

S 74289

43.00

N 53

11.42

S 16780

8.10

S 70618

3.90

S 51170

2.40

S 8844

6.58

S 39269

S 6558 3.70

5.37

S 54885

S 4523 8.50

9.82

S 69781

6.8

S 8836

7.47

S 5517

38.40

S 3521

36.50

S 1808

9.98

N 5250

N 9116 52.50

7.66

N 8891

8.41

N 9609

N 8052 6.62

5.88

N 9909

10.10

N 1102

N 8970 42.60

34.30

N 8269

66.60

N 9979

35.20

N 3707

1.64

N 1115

9.46

N 1422

6.28

N 1129

28.29

S 16787

3.21

S 16783

2.97 S 51182

2.46 S 75435

1.97 S 52084

3.24

S 75433

1.51

S 75432

1.63

S 73974

6.26

S 51176

4.22

S 58923

9.27

S 38461

5.67

S 58922

2.71

S 51169

2.09

S 51183

2.92

S 51177

3.61

S 48579

3.96

S 75438

2.01

S 90279

1.77

S 48519

3.87

S 75437

1.55

S 70614

6.33

S 70263

S 48577 4.31

4.59

S 51185

2.64

S 62397

4.33

S 53324

6.03

S 57371

8.04

S 51186

2.71

S 58921

5.33

S 91814

8.56

S 15048

6.68

S 53325

2.96

S 58925

9.72

S 58924

8.89 S 57372

3.01

S 53333

5.45

S 51568

8.83

S 51571

7.87

S 6411

28.85

S 46549

23.40

S 62395

6.62

S 47231

S 52449 2.69

7.13

S 74291

38.80

S 46530

9.95

S 3955

52.87

S 42683

57.80

S 57366

4.29

S 77435

8.59

S 6413

47.15

S 46965

44.20

S 6431

41.73 S 6441

35.42

S 46532

4.43

S 3513

60.41

S 3870

53.89

S 3543

16.11

S 65602

70.80

S 3871

46.47

S 1812

45.19

S 66847

74.40

N 9314

20.33

N 9189

43.43

N 9152

24.36

S 9129

13.75

S 22579

40.40

S 75456

72.10

S 9130

10.78

S 47489

11.1

S 3529

24.16

S 1814

36.87

S 57458

31.30

S 65603

24.20

S 1815

45.71

S 54882

8.97

S 1810

48.78

S 47751

7.87

S 11240

52.50

S 76019

50.80

S 3516

36.95

S 45636

8.82

S 1806

51.34

S 11204

41.80

S 1809

27.71

S 63835

7.98

S 1807

S 1805 21.22

38.96

S 1803

16.23 S 64192

9.42

S 67537

2.25

N 12743

4.51

N 6668

67.59

N 1152

49.43

N 2269

30.29 N 4223

N 9809 26.73

31.37

N 1184

19.19

Q 3810

16.91

N 1118

84.76

N 6294

66.52

N 1228

62.17

N 9608

N 9896 16.63

77.22

N 1120

48.83

N 9607

27.89

N 9899

15.87 N 9902

76.45 N 9906

86.42

N 9099

25.89

N 9313

47.74 N 9897

29.79

N 9892

10.95

N 9711

60.18

N 1616

72.78

N 7397

66.53

N 1614

58.69

N 1197

69.65

N 1233

66.88

N 9662

49.23

N 1259

47.21

N 9945

42.92

N 9668

28.09

N 1110

16.89

N 10001

9.52

S 70627

13.95

S 70617

11.45

S 46524

S 58960 10.05

S 58959 21.31

15.66

S 106189

13.30

S 46525

12.14 S 33921

17.39

S 40852

29.65

S 66511

12.57

S 51586

22.53

S 51577

17.37

S 40853

36.32

S 62407

13.09

S 46529

14.26

S 51579

26.08

S 40849

39.29

S 36013

20.61

S 66512

49.59

S 76834

46.26

S 74302

18.14

S 47230

12.93

S 47754

23.83

S 42681

30.21 S 16883

28.78

S 66510

54.48

S 65855

46.33

S 46536

11.12

S 74292

33.31

S 46542

22.46

S 36147

33.64

S 74308

18.49

S 67564

55.76

S 66506

50.54

S 46281

20.03

S 46517

71.68

S 46534

10.22

S 41050

67.62

S 40842

47.63

S 50512

37.72

S 46544

23.51

S 45207

61.05

S 46546

26.03

S 46537

11.13

S 40843

36.83

S 57484

11.13

S 54883

31.35

S 55049

55.52

S 50500

69.96

S 50513

45.24

S 57488

27.81

S 94486

14.36

S 16881

32.04

S 66508

38.54

S 40840

59.39

S 36152

18.62

S 50505

46.41

S 45208

75.36

S 47750

26.18

S 65607

49.61

S 45210

61.36

S 24774

45.55

N 13631

13.91

N 12711

31.15

S 48442

12.55

S 36142

42.96

S 65604

20.91

S 45594

47.95

S 64317

74.28

S 76478

45.77

S 24771

53.51

S 65601

38.42

S 44918

42.85

S 95963

73.46

S 16874

73.18

S 64313

71.94

S 36143

31.83 S 57470

24.52

S 36144

34.35 S 17987

27.03

S 63814

17.04

S 56030

18.66 S 63830

12.51

S 10370

26.74

S 43815

S 10314 26.11

30.16

S 43809

19.84

S 10142

12.58

N 10606

64.77

N 12240

27.08

N 10245

47.44

N 12469

22.53

N 10035

52.15

N 12239

42.26

N 12250

45.39

N 12249

23.69

N 13374

26.27

N 13373

23.18

N 13372

18.09

S 120292

58.67

N 9694

112.49

N 12451

120.93 S 51581

7.75

S 8833

15.08

S 4271

10.20

S 123414

24.58

S 12091

61.39

01304250

5.94

01305500

3.33

01308000

6.98

01306499

2.03

01306460

17.70

01305000

19.10

01304500

6.92

01303500

5.63

01310500

11.19 01309990

18.99

01309950

16.19

01309500

18.99

01308500

11.26

01304000

10.29

01304705

4.93

No data

Date

Oct 2015

Nov 2015Dec 2015

Jan 2016

Feb 2016

Mar 2016

Apr 2016

May 2016

Jun 2016

Jul 2016

Aug 2016

Sep 2016

20.0

22.0

24.0

26.0

28.0

30.0

Altitude, in feet relative to NGVD 29

USGS 404757073440401 N 9099

Daily mean altitude (NGVD 29)

Water level shown on map (NGVD 29)

EXPLANATION

Date

Oct 2015

Nov 2015

Dec 2015

Jan 2016

Feb 2016

Mar 2016

Apr 2016

May 2016

Jun 2016

Jul 2016

Aug 2016

Sep 2016

Altitude, in feet relative to NGVD 29

66.0

68.0

70.0

72.0

74.0

76.0

USGS 404553073351201 N 1616

Daily mean altitude (NGVD 29)

Water level shown on map (NGVD 29)

EXPLANATION

Date

Oct 2015

Nov 2015

Dec 2015

Jan 2016

Feb 2016

Mar 2016

Apr 2016

May 2016

Jun 2016

Jul 2016

Aug 2016

Sep 2016

38.0

40.0

42.0

44.0

46.0

48.0

Altitude, in feet relative to NGVD 29

USGS 404958073085001 S 1812

Daily mean altitude (NGVD 29)

Water level shown on map (NGVD 29)

EXPLANATION

NO DATA

Date

Oct 2015

Nov 2015Dec 2015

Jan 2016

Feb 2016

Mar 2016

Apr 2016

May 2016

Jun 2016

Jul 2016

Aug 2016

Sep 2016

32.0

34.0

36.0

38.0

40.0

42.0

Altitude, in feet relative to NGVD 29

USGS 405149072532201 S 5517

Daily mean altitude (NGVD 29)

Water level shown on map (NGVD 29)

EXPLANATION

Date

Oct 2015

Nov 2015Dec 2015

Jan 2016

Feb 2016

Mar 2016

Apr 2016

May 2016

Jun 2016

Jul 2016

Aug 2016

Sep 2016

8.0

10.0

12.0

14.0

16.0

18.0

Altitude, in feet relative to NGVD 29

Daily mean altitude (NGVD 29)

Water level shown on map (NGVD 29)

EXPLANATION

USGS 405756072173502 S 8833

NO DATA

Date

Oct 2015

Nov 2015Dec 2015

Jan 2016

Feb 2016

Mar 2016

Apr 2016

May 2016

Jun 2016

Jul 2016

Aug 2016

Sep 2016

4.0

6.0

8.0

10.0

12.0

14.0

Altitude, in feet relative to NGVD 29

USGS 405743072425701 S 4271

Daily mean altitude (NGVD 29)

Water level shown on map (NGVD 29)

EXPLANATION

NO DATA

?

5

5

5

5

5 5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5 5

5

5

5

5

5

5

5