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Bench Mark Sheet for 8447355, MONUMENT BEACH T-8 MA

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                                                
Station ID: 8447355                         PUBLICATION DATE:  06/28/2004
Name:       MONUMENT BEACH  T-8                               
            MA
NOAA Chart: 13246                           Latitude:   41° 42.9' N (  41.71500)
USGS Quad:  POCASSET                        Longitude:  70° 37.0' W ( -70.61670)


To reach the tidal bench marks from the intersection of Interstate 195 and Route
6 on Cape Cod, proceed east on U.S. Route 6 to the town of Bourne to Monument
Beach on Shore Road.  The bench marks are between Shore Road and the shoreline. 
The tide gage and staff were located at the town wharf.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1931
                         DESIGNATION:          844 7355 TIDAL 1

MONUMENTATION:           Survey disk                           VM#:         2027
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:        
SETTING CLASSIFICATION:  Granite boulder                       OPUS PID:        
LATITUDE:   41° 42.9' N (  41.71500)          LONGITUDE:  70° 37.0' W ( -70.61670)


The primary bench mark is a disk set in the top of a 2.6 m x 1.4 m (8.5 ft x 4.5
ft) granite boulder in the lawn of Fred F. Field about 0.6 km (0.4 mi) south of
the Monument Beach railroad station, 37 m (132 ft) NE of the SW corner of the
rock fence around the property and east across the road from the bathing beach,
19 m (61 ft) east of the centerline of the main highway, and 0.6 m (2 ft) above
ground level on the west side of the boulder.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                                                
Station ID: 8447355                         PUBLICATION DATE:  06/28/2004
Name:       MONUMENT BEACH  T-8                               
            MA
NOAA Chart: 13246                           Latitude:   41° 42.9' N (  41.71500)
USGS Quad:  POCASSET                        Longitude:  70° 37.0' W ( -70.61670)


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


                         BENCH MARK STAMPING:  NO 2 1931
                         DESIGNATION:          844 7355 TIDAL 2

MONUMENTATION:           Survey disk                           VM#:         2028
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:        
SETTING CLASSIFICATION:  Concrete wall                         OPUS PID:        
LATITUDE:   41° 42.9' N (  41.71500)          LONGITUDE:  70° 37.0' W ( -70.61670)


The bench mark is a disk set in a concrete retaining wall on the south side of
the building used as the post office, about 30 m (100 ft) SE of the SE corner of
the train platform, 8 m (27 ft) east of the curb line of the street, and level
with a concrete sidewalk leading from the street to the south door of the house,
2 m (6 ft) south of the wall of the building, and 0.15 m (0.5 ft) north of the
end of the retaining wall.



                         BENCH MARK STAMPING:  7355 E 1976
                         DESIGNATION:          844 7355 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         2030
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete step                         OPUS PID:        
LATITUDE:   41° 42.9' N (  41.71500)          LONGITUDE:  70° 37.0' W ( -70.61670)


The bench mark is a disk set in the concrete step of the Marina office entrance
located at the Monument Beach Marina , 1.65 m (5.4 ft) SE of the SW corner of
the Marina office building, and 0.85 m (2.8 ft) south of the southern entrance
to the Marina office, and 12 cm (0.4 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                                                
Station ID: 8447355                         PUBLICATION DATE:  06/28/2004
Name:       MONUMENT BEACH  T-8                               
            MA
NOAA Chart: 13246                           Latitude:   41° 42.9' N (  41.71500)
USGS Quad:  POCASSET                        Longitude:  70° 37.0' W ( -70.61670)


                            T I D A L   D A T U M S 


Tidal datums at MONUMENT BEACH  T-8 based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           August 1977
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8452660 NEWPORT, NARRAGANSETT BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.352
     MEAN HIGH WATER                            MHW    =  1.265
     MEAN TIDE LEVEL                            MTL    =  0.660
     MEAN SEA LEVEL                             MSL    =  0.582
     MEAN LOW WATER                             MLW    =  0.055
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1931                                   5.461    4.196
     NO 2 1931                                   6.623    5.358
     7355 E 1976                                 2.245    0.980


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

                                                                                
Station ID: 8447355                         PUBLICATION DATE:  06/28/2004
Name:       MONUMENT BEACH  T-8                               
            MA
NOAA Chart: 13246                           Latitude:   41° 42.9' N (  41.71500)
USGS Quad:  POCASSET                        Longitude:  70° 37.0' W ( -70.61670)


                             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.

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Revised: 08/08/2018
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