U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  05/25/1988
Station ID: 8534287                                SUPERCEDED DATE:   04/21/2003
Name:       LITTLE SHEEPSHEAD CREEK, GREAT BAY                
            NEW JERSEY
NOAA Chart: 12316                                  Latitude:         39° 31.1' N
USGS Quad:  TUCKERTON                              Longitude:        74° 19.2' W


To reach the tidal bench marks from the Post Office at Tuckerton, proceed 0.3
mile (0.5 km) south on Great Bay Boulevard, 400 feet (122 m) north of the bridge
over Little Sheepshead Creek.  The bench marks are located along Great Bay
Boulevard.  The tide gage and staff were located on a old warehouse pier.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1974

MONUMENTATION:           Survey Disk                               VM#:     2671
AGENCY:                                                            PID#:  JU0236
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set in the SE corner of a concrete barge loading platform at
the waters edge, 126.9 feet (38.7 m) SW of the SE corner of a 1-story fish
products warehouse, 116.1 feet (35.4 m) west of wood utility pole #P18927, 84.0
feet (25.6 m) west of the centerline of Great Bay Boulevard, 6.2 feet (1.9 m) NE
of a witness post, and 1.0 foot (0.3 m) NW of the SE corner of the concrete
platform.



                         BENCH MARK STAMPING:  P 55 1961

MONUMENTATION:           Survey Disk                               VM#:     2670
AGENCY:                                                            PID#:  JU0238
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in a tile filled with concrete and set on top of a 5-foot
(1.5 m) long cedar post 41.5 feet (12.6 m) east of the centerline of the road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                   PUBLICATION DATE:  05/25/1988
Station ID: 8534287                                SUPERCEDED DATE:   04/21/2003
Name:       LITTLE SHEEPSHEAD CREEK, GREAT BAY                
            NEW JERSEY
NOAA Chart: 12316                                  Latitude:         39° 31.1' N
USGS Quad:  TUCKERTON                              Longitude:        74° 19.2' W


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


                         BENCH MARK STAMPING:  4287 A 1976

MONUMENTATION:           Survey Disk                               VM#:     2672
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is 192.7 feet (58.7 m) SE of Bench Mark NO 1 1974, 171 feet (52
m) north of the south face of the north timber abutment of the wooden bridge
over Little Sheepshead Creek, 23.2 feet (7.1 m) east of the centerline of Great
Bay Boulevard, and 3.6 feet (1.1 m) south of wood utility pole #P37918.  The
bench mark is set 0.1 foot (0.03 m) below ground level, crimped to a copper-clad
steel rod driven 50 feet (15 m) to refusal, and encased in a PVC pipe and
concrete kickblock.



                         BENCH MARK STAMPING:  4319 B 1976

MONUMENTATION:           Survey Disk                               VM#:     2673
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is 49.8 feet (15.2 m) east of the SE corner of the easterly end
of the walkway leading to the former Little Egg Coast Guard Station, 19.4 feet
(5.9 m) east of the centerline of Great Bay Boulevard, and 5.9 feet (1.8 m)
south of wood utility pole #T6619.  The bench mark is set 0.1 foot (0.03 m)
below ground level, crimped to a copper-clad steel rod driven 50 feet (15 m) to
refusal, and encased in a PVC pipe and concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                   PUBLICATION DATE:  05/25/1988
Station ID: 8534287                                SUPERCEDED DATE:   04/21/2003
Name:       LITTLE SHEEPSHEAD CREEK, GREAT BAY                
            NEW JERSEY
NOAA Chart: 12316                                  Latitude:         39° 31.1' N
USGS Quad:  TUCKERTON                              Longitude:        74° 19.2' W


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


                         BENCH MARK STAMPING:  4319 C 1976

MONUMENTATION:           Survey Disk                               VM#:     2674
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is 0.1 mile (0.2 km) north of Bench Mark 4319 B 1976, NE of wood
utility pole #P18944, and 18.7 feet (5.7 m) east of the centerline of Great Bay
Boulevard.  The bench mark is 0.2 foot (0.1 m) below ground level, crimped to a
copper-clad steel rod driven 50 feet (15 m) to refusal, and  encased in a PVC
pipe and concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                   PUBLICATION DATE:  05/25/1988
Station ID: 8534287                                SUPERCEDED DATE:   04/21/2003
Name:       LITTLE SHEEPSHEAD CREEK, GREAT BAY                
            NEW JERSEY
NOAA Chart: 12316                                  Latitude:         39° 31.1' N
USGS Quad:  TUCKERTON                              Longitude:        74° 19.2' W


                            T I D A L   D A T U M S 


Tidal datums at LITTLE SHEEPSHEAD CREEK, GREAT BAY based on:

     LENGTH OF SERIES:      9 MONTHS
     TIME PERIOD:           MARCH 1977 - NOVEMBER 1977
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8557380 LEWES, DE


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

     HIGHEST OBSERVED WATER LEVEL (10/14/1977)         =   6.45
     MEAN HIGHER HIGH WATER                     MHHW   =   3.64
     MEAN HIGH WATER                            MHW    =   3.28
     MEAN TIDE LEVEL                            MTL    =   1.70
     MEAN LOW WATER                             MLW    =   0.13
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (01/22/1977)         =  -1.97

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1974                                   7.17      3.89
     P 55 1961                                   4.73      1.45
     4287 A 1976                                11.30      8.02
     4319 B 1976                                 5.54      2.26
     4319 C 1976                                 4.70      1.42


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

                                                   PUBLICATION DATE:  05/25/1988
Station ID: 8534287                                SUPERCEDED DATE:   04/21/2003
Name:       LITTLE SHEEPSHEAD CREEK, GREAT BAY                
            NEW JERSEY
NOAA Chart: 12316                                  Latitude:         39° 31.1' N
USGS Quad:  TUCKERTON                              Longitude:        74° 19.2' W


                             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 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.