U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 02/19/1986
Station ID: 8447355 SUPERCEDED DATE: 04/21/2003
Name: MONUMENT BEACH, BUZZARD'S BAY
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 42.9' N
USGS Quad: POCASSET Longitude: 70° 37.0' W
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
MONUMENTATION: Survey Disk VM#: 2027
AGENCY: PID:
SETTING CLASSIFICATION: Granite Boulder
The bench mark is set in the top of a 8.5 x 4.5 foot (2.6 x 1.4 m) granite
boulder in the lawn of Fred F. Field about 0.4 mile (0.6 km) south of the
Monument Beach railroad station, 132 feet (37 m) NE of the SW corner of the rock
fence around the property and east across the road from the bathing beach, 61
feet (19 m) east of the centerline of the main highway, and 2 feet (0.6 m) above
ground level on the west side of the boulder.
BENCH MARK STAMPING: NO 2 1931
MONUMENTATION: Survey Disk VM#: 2028
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Wall
The bench mark is set in a concrete retaining wall on the south side of the
building used as the post office, about 100 feet (30 m) SE of the SE corner of
the train platform, 27 feet (8 m) 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,
6 feet (2 m) south of the wall of the building, and 0.5 foot (0.2 m) north of
the end of the retaining wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 02/19/1986
Station ID: 8447355 SUPERCEDED DATE: 04/21/2003
Name: MONUMENT BEACH, BUZZARD'S BAY
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 42.9' N
USGS Quad: POCASSET Longitude: 70° 37.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1931
MONUMENTATION: Survey Disk VM#: 2029
AGENCY: PID#: LW1555
SETTING CLASSIFICATION: Granite Doorway
The bench mark is set on the south side of a granite doorway of the waiting room
of the New York, New Haven and Hartford railroad depot at Monument Beach, 14.5
feet (4.4 m) east of the centerline of the railroad tracks, and 0.5 foot (0.2 m)
above ground level.
BENCH MARK STAMPING: 7355 E 1976
MONUMENTATION: Survey Disk VM#: 2030
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Step
The bench mark is located at the Monument Beach Marina in the concrete step of
the Marina office entrance, 5.4 feet (1.6 m) SE of the SW corner of the Marina
office building, and 2.8 feet (0.9 m) south of the southern entrance to the
Marina office, and 0.4 foot (0.1 m) above ground level.
BENCH MARK STAMPING: 7355 F 1976
MONUMENTATION: Survey Disk VM#: 2031
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified
The bench mark is located at an abandoned train depot at Monument Beach, 214
feet (65 m) south of Bench Mark NO 3 1931, 58.6 feet (17.9 m) north of the
southern end of the concrete platform, 57.5 feet (17.5 m) west of the centerline
of Shore Drive, 2.5 feet (0.8 m) east of the railroad tracks and 0.5 foot (0.2
m) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 02/19/1986
Station ID: 8447355 SUPERCEDED DATE: 04/21/2003
Name: MONUMENT BEACH, BUZZARD'S BAY
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 42.9' N
USGS Quad: POCASSET Longitude: 70° 37.0' W
T I D A L D A T U M S
Tidal datums at MONUMENT BEACH, BUZZARD'S BAY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: JULY 1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8452660 NEWPORT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (09/14/1977) = 5.89
MEAN HIGHER HIGH WATER (MHHW) = 4.42
MEAN HIGH WATER (MHW) = 4.13
MEAN TIDE LEVEL (MTL) = 2.14
MEAN LOW WATER (MLW) = 0.15
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (08/28/1977) = -0.93
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 1 1931 18.10 13.97
NO 2 1931 21.89 17.76
NO 3 1931 19.92 15.79
7355 E 1976 7.56 3.43
7355 F 1976 17.51 13.38
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 02/19/1986
Station ID: 8447355 SUPERCEDED DATE: 04/21/2003
Name: MONUMENT BEACH, BUZZARD'S BAY
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 42.9' N
USGS Quad: POCASSET Longitude: 70° 37.0' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.