U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                                                
Station ID: 8518750                         PUBLICATION DATE:  11/20/2012
Name:       THE BATTERY, NEW YORK HARBOR                      
            NY
NOAA Chart: 12335                           Latitude:   40° 42.0' N (  40.70060)
USGS Quad:  NEW JERSEY CITY                 Longitude:  74°  0.9' W ( -74.01420)


To reach the tidal bench marks from New Jersey, take exit 14-C on the New Jersey
Turnpike for the Holland Tunnel to Manhattan, then take the Downtown exit to
Broadway.  Proceed south on Broadway to its end at The Battery. Turn onto State
Street and proceed on State Street for 0.3 km (0.2 mi) to the U.S. Coast Guard
Inspection Office. The bench marks are located in the area around Battery Park.
The tide gage and staff are located on the pier behind the Inspection Office.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  NO 7 1975
                         DESIGNATION:          851 8750 TIDAL 7

MONUMENTATION:           Tidal Station disk                    VM#:          291
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AB6736
SETTING CLASSIFICATION:  Loading dock                          OPUS PID:        
LATITUDE:   40° 42.2' N (  40.70344)          LONGITUDE:  74°  0.9' W ( -74.01464)


The primary bench mark is a disk set in a concrete loading dock, 68.6 m (225 ft)
east of the SW corner of the Coast Guard Building, 13.87 m (45.5 ft) SW of the
westernmost corner of a blue brick guard house, 0.91 m (3.0 ft) SW of the south
corner of the building, and 0.82 m (2.7 ft) above ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8518750                         PUBLICATION DATE:  11/20/2012
Name:       THE BATTERY, NEW YORK HARBOR                      
            NY
NOAA Chart: 12335                           Latitude:   40° 42.0' N (  40.70060)
USGS Quad:  NEW JERSEY CITY                 Longitude:  74°  0.9' W ( -74.01420)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  NO 3
                         DESIGNATION:          851 8750 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:          287
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  KV0584
SETTING CLASSIFICATION:  Concrete wall                         OPUS PID:        
LATITUDE:   40° 42.2' N (  40.70378)          LONGITUDE:  74°  1.0' W ( -74.01656)


The bench mark is a disk set in the north end of a low concrete wall surrounding
the Castle Clinton National Monument, 61.36 m (201.3 ft) SW of the face of the
John Ericsson Statue, 23.80 m (78.1 ft) NW of the NW corner of the marble base
of the monument - The Immigrants, and 20.76 m (68.1 ft) north of the main
entrance to the castle.



                         BENCH MARK STAMPING:  NO 6 1975
                         DESIGNATION:          851 8750 TIDAL 6

MONUMENTATION:           Tidal Station disk                    VM#:          290
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AB6737
SETTING CLASSIFICATION:  Concrete bulkhead                     OPUS PID:        
LATITUDE:   40° 42.1' N (  40.70097)          LONGITUDE:  74°  0.8' W ( -74.01381)


The bench mark is a disk set at the NW corner of a boat slip at the U.S. Coast
Guard Inspection Office, 22.9 m (75 ft) east of the building, 15.2 m (50 ft)
west of the Staten Island Ferry Terminal, 0.6 m (2 ft) west of the west bulkhead
line of the slip, and 0.3 m (1 ft) north of the north bulkhead line of the slip.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8518750                         PUBLICATION DATE:  11/20/2012
Name:       THE BATTERY, NEW YORK HARBOR                      
            NY
NOAA Chart: 12335                           Latitude:   40° 42.0' N (  40.70060)
USGS Quad:  NEW JERSEY CITY                 Longitude:  74°  0.9' W ( -74.01420)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  BM
                         DESIGNATION:          851 8750 TIDAL 748

MONUMENTATION:           Bolt                                  VM#:          292
AGENCY:                                                        IDB PID#:  KV0579
SETTING CLASSIFICATION:  Concrete buttress                     OPUS PID:        
LATITUDE:   40° 42.2' N (  40.70378)          LONGITUDE:  74°  0.8' W ( -74.01400)


The bench mark is the horizontal line on a 7/8 inch copper bolt set vertically
in the north face of the south buttress on the west side of the U.S. Custom
House building at the intersection of State and Bridge Street, 18.0 m (59 ft)
north of the north curb of Bridge Street, 3.51 m (11.5 ft) south of the
centerline of the south entrance to the Custom House on State Street, 3.02 m
(9.9 ft) east of the east curb of State Street, 0.15 m (0.5 ft) west of the
buttress, and 0.82 m (2.7 ft) above the sidewalk.



                         BENCH MARK STAMPING:   
                         DESIGNATION:          851 8750 TIDAL 749

MONUMENTATION:           Chiseled Square                       VM#:          293
AGENCY:                                                        IDB PID#:  KV0580
SETTING CLASSIFICATION:  Granite step                          OPUS PID:        
LATITUDE:   40° 42.2' N (  40.70375)          LONGITUDE:  74°  0.9' W ( -74.01428)


The bench mark is a chiseled square cut in the top of the SE corner of the fifth
granite step to the south entrance of the U.S. Customs House on State Street in
Battery Park, 23.8 m (78 ft) north of the centerline of Bridge Street, 4.05 m
(13.3 ft) east of the east curb of State Street, 0.09 m (0.3 ft) south of the
south end of the sixth step, and 0.76 (2.5 ft) above the sidewalk.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8518750                         PUBLICATION DATE:  11/20/2012
Name:       THE BATTERY, NEW YORK HARBOR                      
            NY
NOAA Chart: 12335                           Latitude:   40° 42.0' N (  40.70060)
USGS Quad:  NEW JERSEY CITY                 Longitude:  74°  0.9' W ( -74.01420)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  R 340 1952
                         DESIGNATION:          R 340

MONUMENTATION:           Bench Mark disk                       VM#:        15533
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  KV0587
SETTING CLASSIFICATION:  Granite sea wall                      OPUS PID:        
LATITUDE:   40° 42.1' N (  40.70089)          LONGITUDE:  74°  0.9' W ( -74.01517)


The bench mark is a disk set in the SW edge of the concrete base of a mooring
cleat in a granite seawall at the extreme south corner of Battery Park, next to
the west side of the U.S. Coast Guard property, 2.56 m (8.4 ft) NW of the south
corner of the seawall, 0.61 m (2.0 ft) NE of the SW edge of the seawall, and
0.09 m (0.3 ft) SW of the edge of the mooring cleat.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8518750                         PUBLICATION DATE:  11/20/2012
Name:       THE BATTERY, NEW YORK HARBOR                      
            NY
NOAA Chart: 12335                           Latitude:   40° 42.0' N (  40.70060)
USGS Quad:  NEW JERSEY CITY                 Longitude:  74°  0.9' W ( -74.01420)


                            T I D A L   D A T U M S 


Tidal datums at THE BATTERY, NEW YORK HARBOR based on:

     LENGTH OF SERIES:      19 YEARS
     TIME PERIOD:           January 1983 - December 2001
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:   


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     HIGHEST OBSERVED WATER LEVEL (10/30/2012)         =  4.280
     MEAN HIGHER HIGH WATER                     MHHW   =  1.541
     MEAN HIGH WATER                            MHW    =  1.443
     North American Vertical Datum              NAVD88 =  0.846
     MEAN SEA LEVEL                             MSL    =  0.783
     MEAN TIDE LEVEL                            MTL    =  0.753
     MEAN LOW WATER                             MLW    =  0.063
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (02/02/1976)         = -1.307

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 7 1975                                   4.468    3.025
     NO 3                                        4.277    2.834
     NO 6 1975                                   3.556    2.113
     BM                                          5.719    4.276
     851 8750 TIDAL 749                          5.689    4.246
     R 340 1952                                  2.849    1.406


Foot Notes:

 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  6

                                                                                
Station ID: 8518750                         PUBLICATION DATE:  11/20/2012
Name:       THE BATTERY, NEW YORK HARBOR                      
            NY
NOAA Chart: 12335                           Latitude:   40° 42.0' N (  40.70060)
USGS Quad:  NEW JERSEY CITY                 Longitude:  74°  0.9' W ( -74.01420)


                             D E F I N I T I O N S


Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch.  It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).

NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint.  NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights.  Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at 
National Geodetic Survey.

NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded.  NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads.  NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929.  Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at 
National Geodetic Survey.

NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.

The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum.  As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.