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84

TACONIC STATE PARKWAY

73°55' 73°50' 73°45'

41°45'

41°40'

41°35'

41°30'

Base from U.S. Geological Survey digital raster graphics, 1:24,000 Hydrology modified from Moore and others, 1982

Universal Transverse Mercator projection, North American Datum 1983, Zone 18N

EXPLANTION

Water-table contour—Shows the average altitude of the water table 

in the surficial sand and gravel aquifer that occupies the Sprout and 

Fishkill Creek valleys. Water-table contours are extended into adjacent 

permeable units, such as kame sand and gravel and fine-grained 

lacustrine units, to show the general direction of groundwater flow. 

Contour interval is 10 feet. Datum is National Geodetic Vertical 

Datum of 1929

Groundwater divide—Shows approximate location of local 

groundwater divides as inferred from average water-table conditions 

shown here

Direction of groundwater flow—Shows the general direction of 

groundwater flow under average, non-pumping conditions

Aquifer boundary—Shows the boundary between the surficial sand 

and gravel aquifer that occupies the Sprout and Fishkill Creek valleys 

and adjacent till and bedrock hills

Limit of mapped area—Indicates arbitrary truncation of mapped area

Altitude of the water table

The water table in an unconfined aquifer is defined by the static levels to which 

groundwater rises in tightly cased shallow wells that extend a few feet into the 

zone of saturation. Streams and rivers that are fed by groundwater also reflect the 

approximate water-table altitude during dry-weather streamflow conditions (base 

flow). This map shows the estimated altitude of the water table in the surficial 

sand and gravel aquifer that occupies the Sprout and Fishkill Creek valleys under 

average conditions. It was constructed from (1) historic water-level data from 

shallow drilled and dug wells that were obtained from drillers’ records during a 

well inventory of Dutchess County (Simmons and others, 1961), (2) water-level 

measurements made by drillers at the time a well was drilled as reported to the 

NYSDEC under the Water Well Program, (3) water-level measurements made in 

monitoring wells installed by consulting firms as part of remedial investigations of 

the Hopewell Precision and Shenandoah Road Superfund sites, and (4) the altitude 

of stream surfaces as indicated on the topographic base map.

Prepared in cooperation with the

NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

Hydrogeologic Data Update for the Stratified-Drift Aquifer in the Sprout and Fishkill Creek Valleys, Dutchess County, New York

by

Richard J. Reynolds and F.J. Calef III

2010

SCALE 1:24,000

SCIENTIFIC INVESTIGATIONS MAP 3136

Altitude of the water table - SHEET 3 of 4

Reynolds, R.J., and Calef, F.J., III., 2010,

Hydrogeologic data update for the stratified-drift aquifer in the Sprout

and Fishkill Creek valleys, Dutchess County, New York

0 0.25 0.5 0.75 1 MILE

0 0.5 1 KILOMETER

Lake Ontario

Lake

Erie

DUTCHESS

COUNTY

NEW YORK

CANADA

VERMONT

PENNSYLVANIA

Atlantic

Ocean

NEW

HAMPSHIRE

MASSACHUSETTS

CONNECTICUT

NEW

JERSEY

41 ̊

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80 ̊ 79 ̊ 78 ̊ 77 ̊ 76 ̊ 75 ̊ 74 ̊ 73 ̊

45 ̊

72 ̊

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0 25 50 75 100 KILOMETERS

Study area