U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 06/13/1988
Station ID: 8447584 SUPERCEDED DATE: 04/21/2003
Name: NEW BEDFORD-FAIRHAVEN BRIDGE, NEW BEDFORD HARBOR
MASSACHUSETTS
NOAA Chart: 13230 Latitude: 41° 38.4' N
USGS Quad: NEW BEDFORD NORTH Longitude: 70° 55.1' W
To reach the tidal bench marks from the Post Office near the intersection of
Pleasant Street and U.S. Highway 6 (Rempton Street) in New Bedford, proceed NE
on U.S. Highway 6 to the New Bedford-Fairhaven Bridge. The bench marks are
located along U.S. Highway 6 and in the vicinity of Glen Petroleum, Inc. (north
of the west end of the bridge). The tide gage and staff were located on the
Glen Petroleum, Inc. oil pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7584 L 1977
MONUMENTATION: Survey Disk VM#: 2061
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set in the top surface of the west face of the stone and
cement sea wall on the Glen Petroleum, Inc. oil pier, 3 feet (1 m) south of the
intersection of the pier and the sea wall, and 1 foot (0.3 m) east of the edge
of the sea wall.
BENCH MARK STAMPING: 7584 D 1977
MONUMENTATION: Survey Disk VM#: 2057
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is set flush in the sidewalk on the south side of U.S. Highway 6,
150 feet (45 m) east of Bench Mark 7584 G 1977, 75 feet (23 m) west of the swing
gate to the swing bridge on the New Bedford-Fairhaven Bridge, 5 feet (1 m) east
of a fire hydrant, 3 feet (1 m) south of U.S. Highway 6, and level with the
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 06/13/1988
Station ID: 8447584 SUPERCEDED DATE: 04/21/2003
Name: NEW BEDFORD-FAIRHAVEN BRIDGE, NEW BEDFORD HARBOR
MASSACHUSETTS
NOAA Chart: 13230 Latitude: 41° 38.4' N
USGS Quad: NEW BEDFORD NORTH Longitude: 70° 55.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7584 E 1977
MONUMENTATION: Survey Disk VM#: 2058
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is set flush in the sidewalk on the north side of U.S. Highway 6
across from the Mobil Service Station, 30 feet (9 m) SE of the edge of the sea
wall, 4 feet (1 m) north of the edge of U.S. Highway 6, 2 feet (1 m) north of a
light pole, and level with the ground.
BENCH MARK STAMPING: 7584 G 1977
MONUMENTATION: Survey Disk VM#: 2059
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is set flush in the sidewalk on the south side of U.S. Highway 6,
130 feet (40 m) east of Bench Mark 7584 J 1977, 1 foot (0.3 m) south of the edge
of U.S. Highway 6, 1 foot (0.3 m) NE of a steel water main cover in the
sidewalk, and level with the ground.
BENCH MARK STAMPING: 7584 J 1977
MONUMENTATION: Survey Disk VM#: 2060
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is set flush in the surface of the sidewalk on the south side of
U.S. Highway 6 on the north side of the Mobil Service Station, 4 feet (1 m) west
of a fire hydrant, 1 foot (0.3 m) south of the edge of U.S. Highway 6, and level
with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 06/13/1988
Station ID: 8447584 SUPERCEDED DATE: 04/21/2003
Name: NEW BEDFORD-FAIRHAVEN BRIDGE, NEW BEDFORD HARBOR
MASSACHUSETTS
NOAA Chart: 13230 Latitude: 41° 38.4' N
USGS Quad: NEW BEDFORD NORTH Longitude: 70° 55.1' W
T I D A L D A T U M S
Tidal datums at NEW BEDFORD-FAIRHAVEN BRIDGE, NEW BEDFORD HARBOR based on:
LENGTH OF SERIES: 70 HWS & 69 LWS
TIME PERIOD: OCTOBER 8 - NOVEMBER 13, 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8452660 NEWPORT, RI
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (11/13/1977) = 5.63
MEAN HIGHER HIGH WATER MHHW = 4.16
MEAN HIGH WATER MHW = 3.89
MEAN TIDE LEVEL MTL = 2.00
MEAN LOW WATER MLW = 0.12
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (11/12/1977) = -0.77
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
7584 L 1977 7.74 3.85
7584 D 1977 16.96 13.07
7584 E 1977 14.81 10.92
7584 G 1977 16.03 12.14
7584 J 1977 15.10 11.21
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 06/13/1988
Station ID: 8447584 SUPERCEDED DATE: 04/21/2003
Name: NEW BEDFORD-FAIRHAVEN BRIDGE, NEW BEDFORD HARBOR
MASSACHUSETTS
NOAA Chart: 13230 Latitude: 41° 38.4' N
USGS Quad: NEW BEDFORD NORTH Longitude: 70° 55.1' 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.