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

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

ATLANTIC OCEAN

ATLANTIC OCEAN

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

By

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

2018

Base modified from U.S. Geological Survey digital data 1:100,000 series Hydrology by Jason Finkelstein and Simonette Rivera

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

NEW YORK

CONNECTICUT

NEW JERSEY

Long Island

ATLANTIC OCEAN

20 0 20 KILOMETERS

20 0 20 MILES

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

Inset A

Inferred extent of the Jameco aquifer

 

Inferred extent of the Magothy aquifer 

 

Line of equal potentiometric-surface altitude—Shows 

 altitude at which the water level would have stood in 

 tightly cased wells, April–May 2016. Solid where 

 approximately known; dashed where inferred. 

 Contour interval 10 feet. Datum is NGVD 29

20

S 58922

2.55

Monitoring well—Red circle indicates observation well screened 

 in the Magothy aquifer; Red circle with thick border indicates 

 supply well screened in the Magothy aquifer; Orange circle 

 indicates observation well screened in the Jameco aquifer. Upper number 

 is well number assigned by the New York State Department of 

 Environmental Conservation; lower number is potentiometric-surface 

 altitude in feet, NGVD 29. Asterisk (*) indicates water level is not used in

 contouring because it is influenced by elevated chloride values

EXPLANATION

400 feet 

0 feet 

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

300

200

100

10

20

30

40

50

60

70

10

70

20

30

10

10

50

60

30

30

40

40

40

40

40

50

50

50

50

60

60

70

70

10

10

20

20

20

20

30

30

?

?

?

80

80

30 40 50 60

60

50

40

?

?

?

?

?

?

S 38491

37.80

S 67074

36.90

N 3475

75.17

N 3934

N 7650 48.44

45.38

N 8214

23.52

S 64023

24.43

S 69364

17.61

S 57980

37.35

S 47310

49.71

S 52490

49.46

S 33500

S 34460 42.27

35.73

S 70488

54.31

S 23998

54.27

S 19057

55.29 S 53360

47.18

S 43641

40.48

S 45638

65.59

S 47453

41.54

S 46713

11.98

S 60812

24.56

S 50546

27.17

S 63618

19.35

S 51298

35.19

S 42762

18.56

S 37681

27.26

N 9

18.39

N 180

15.10

N 3867

4.20

S 6455

36.10

N 7161

4.86

N 845

68.35

N 6510

4.35*

N 3862

3.79*

N 11396

52.30

N 7493

35.05

S 15514

36.80 S 71576

7.67

S 59992

5.51

S 60123

7.98

S 82939

3.31

S 77436

8.42

S 79408

6.43

N 2528

66.41

N 1155

65.51

N 7554

38.07

N 6702

-2.16*

S 21311

10.57

N 11166

17.45

S 81831

20.85

S 122477

39.10

S 89534

22.71

S 15622

39.63

S 30230

10.79

S 94489

13.86

N 13713

37.47

S 76673

59.52

S 33380

47.32

S 22577

40.01

S 75454

64.53

S 74585

68.62

S 84806

22.72

S 24773

44.26

S 95965

72.87

S 74284

70.32

S 76016

41.74

S 66145

25.52

S 66138

41.98

S 52163

15.22

S 66156

12.68

N 11823

57.64

N 12522

15.54

N 11454

76.34

N 11732

59.26

N 11659

49.37

N 11577

26.12

N 11168

31.65

N 11579

14.48

S 105710

10.29

S 105711

S 117758 11.45

52.74

S 120188

34.21

S 109074

21.08

S 117439

21.96

S 122348

46.62

S 120717

39.65

S 122349

36.02

No data

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

8.0

10.0

12.0

14.0

16.0

18.0

Altitude, in feet relative to NGVD 29

USGS 404030073293703 N 180

Daily mean altitude (NGVD 1929)

Water level shown on map (NGVD 1929)

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

-8.0

-6.0

-4.0

-2.0

0.0

2.0

Altitude, in feet relative to NGVD 29

NO DATA

USGS 403517073430702 N 6702

Daily mean altitude (NGVD 1929)

Water level shown on map (NGVD 1929)

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

70.0

72.0

74.0

76.0

78.0

80.0

Altitude, in feet relative to NGVD 29

USGS 404818073293101 N 11454

Daily mean altitude (NGVD 1929)

Water level shown on map (NGVD 1929)

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

40.0

42.0

44.0

46.0

48.0

50.0

Altitude, in feet relative to NGVD 29

USGS 404932073055902 S 33380

Daily mean altitude (NGVD 1929)

Water level shown on map (NGVD 1929)

EXPLANATION

NO DATA

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 2 of 4

Pamphlet accompanies map

U.S. Department of the Interior

U.S. Geological Survey

ISSN 2329-132X (online)

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: 

https://doi.org/10.3133/sim3398

Plum Island

Gardiners Island

Fishers Island