U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8447281 PUBLICATION DATE: 05/20/2004
Name: STEEPBROOK
MA
NOAA Chart: 13221 Latitude: 41° 44.4' N ( 41.74000)
USGS Quad: FALL RIVER Longitude: 71° 7.9' W ( -71.13170)
To reach the tidal bench marks from Fall River, Massachusetts, take Interstate
195 west to State Route 79. Take Route 79 north to the North Main Road and Fall
River exit, continue north on North Main Road to Clark Street, turn left (west)
onto Clark Street, then proceed to River Street and turn left (south) onto River
Street. The bench marks are located in the vicinity of 180 River Street the
Capt. J.J. O'Connell Company, Incorporated. The tide gage and staff were
located at the SE corner of the old wharf behind the residence at 180 River
Street.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7281 B 1977
DESIGNATION: 844 7281 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 1542
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete step OPUS PID:
LATITUDE: 41° 44.4' N ( 41.74000) LONGITUDE: 71° 7.9' W ( -71.13170)
The primary bench mark is a disk set flush in the first step of west stone wing
wall at the NNW support of the New York, New Haven, and Hartford Railroad
overpass #34-67, located between 3200 North Main Street and 180 River Street, 7
m (23 ft) NW from the north side of the overpass, 6 m (20 ft) west of the
centerline of River Street and 5 m (16 ft) NNE from the centerline of a unnamed
road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8447281 PUBLICATION DATE: 05/20/2004
Name: STEEPBROOK
MA
NOAA Chart: 13221 Latitude: 41° 44.4' N ( 41.74000)
USGS Quad: FALL RIVER Longitude: 71° 7.9' W ( -71.13170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C 147 41 1934 18
DESIGNATION: 844 7281 C 147
MONUMENTATION: Survey disk VM#: 1543
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Stone step OPUS PID:
LATITUDE: 41° 44.4' N ( 41.74000) LONGITUDE: 71° 7.9' W ( -71.13170)
The bench mark is a disk set flush in the east stone wingwall on the fourth step
from the bottom of the New York, New Haven and Hartford railroad bridge overpass
#34-67, located between 3200 North Main Street and 180 River Street.
BENCH MARK STAMPING: 7281 C 1977
DESIGNATION: 844 7281 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 1544
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete step OPUS PID:
LATITUDE: 41° 44.4' N ( 41.74000) LONGITUDE: 71° 7.9' W ( -71.13170)
The bench mark is a disk set flush on the top concrete step located between the
residence at 180 River Street, and a old warehouse, 5 m (17 ft) north of the
north wall of the warehouse, 3.44 m (11.3 ft) north of the NE corner of the
warehouse and 3.26 m (10.7 ft) NW of the centerline of River Street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8447281 PUBLICATION DATE: 05/20/2004
Name: STEEPBROOK
MA
NOAA Chart: 13221 Latitude: 41° 44.4' N ( 41.74000)
USGS Quad: FALL RIVER Longitude: 71° 7.9' W ( -71.13170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7281 D 1977
DESIGNATION: 844 7281 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 1545
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 41° 44.4' N ( 41.74000) LONGITUDE: 71° 7.9' W ( -71.13170)
The bench mark is a disk set flush in the concrete foundation of the warehouse
south of the residence at 180 River Street, located on the north side of the
warehouse near the tracks used by the hoist to lift boats out of the water,
15.97 m (52.4 ft) from the centerline of a paved path to the docks, 12.95 m
(42.5 ft) SW of the NW end of the warehouse and 0.3 m (1 ft) from a drop off to
the tracks.
BENCH MARK STAMPING: 7281 E 1977
DESIGNATION: 844 7281 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 1546
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete seawall OPUS PID#: BBDH98
LATITUDE: 41° 44.4' N ( 41.74000) LONGITUDE: 71° 7.9' W ( -71.13170)
The bench mark is a disk set flush in top of a concrete seawall south of the
boat shed at 180 River Street, 15.64 m (51.3 ft) NW of the SE end of the
seawall, and 5.36 m (17.6 ft) south of the south wall of the boat shed.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8447281 PUBLICATION DATE: 05/20/2004
Name: STEEPBROOK
MA
NOAA Chart: 13221 Latitude: 41° 44.4' N ( 41.74000)
USGS Quad: FALL RIVER Longitude: 71° 7.9' W ( -71.13170)
T I D A L D A T U M S
Tidal datums at STEEPBROOK based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: October 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8454000 PROVIDENCE, PROVIDENCE RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.504
MEAN HIGH WATER MHW = 1.428
MEAN TIDE LEVEL MTL = 0.742
MEAN SEA LEVEL MSL = 0.690
MEAN LOW WATER MLW = 0.056
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7281 B 1977 4.084 2.656
C 147 41 1934 18 5.942 4.514
7281 C 1977 4.085 2.657
7281 D 1977 2.289 0.861
7281 E 1977 2.813 1.385
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8447281 PUBLICATION DATE: 05/20/2004
Name: STEEPBROOK
MA
NOAA Chart: 13221 Latitude: 41° 44.4' N ( 41.74000)
USGS Quad: FALL RIVER Longitude: 71° 7.9' W ( -71.13170)
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.