Superseded Bench Mark Sheet for 8447386, Fall River MA

Present Epoch

Printable version

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

                                                   PUBLICATION DATE:  10/30/1985
Station ID: 8447386                                SUPERCEDED DATE:   04/21/2003
Name:       FALL RIVER, STATE PIER, MOUNT HOPE BAY            
            MASSACHUSETTS
NOAA Chart: 13221                                  Latitude:         41° 42.2' N
USGS Quad:  FALL RIVER                             Longitude:        71°  9.9' W


To reach the tidal bench marks from Tiverton, Rhode Island travel along State
Route 24 north 4 miles (6 km) to Interstate Route 195 West, then Interstate
Route 195 west 3 miles (5 km) to the State Routes 79/138 North Exit, then before
crossing over the bridge, exit at Davol Street (Route 6 East) to State Route 138
South towards Battleship Cove.  The bench marks are located in the retaining
wall south of the State Pier Warehouse and extend between the Fall River
Monument and the Battleship.  The tide gage and staff were located on the State
Pier.


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


                 PRIMARY BENCH MARK STAMPING:   

MONUMENTATION:                                                     VM#:    16015
AGENCY:                                                            PID#:  LW2264
SETTING CLASSIFICATION:  






                         BENCH MARK STAMPING:  1 1955

MONUMENTATION:           Survey Disk                               VM#:     2043
AGENCY:                                                            PID#:  AC8618
SETTING CLASSIFICATION:  Concrete Retaining Wall


The bench mark is set flush in the SE corner of a concrete retaining wall on the
west side of the State Pier, 21.5 feet (6.6 m) SW of the SW corner of the south
warehouse, and 2.5 feet (0.8 m) west of the east end of the retaining wall, with
a fence strung along it.

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

                                                   PUBLICATION DATE:  10/30/1985
Station ID: 8447386                                SUPERCEDED DATE:   04/21/2003
Name:       FALL RIVER, STATE PIER, MOUNT HOPE BAY            
            MASSACHUSETTS
NOAA Chart: 13221                                  Latitude:         41° 42.2' N
USGS Quad:  FALL RIVER                             Longitude:        71°  9.9' W


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


                         BENCH MARK STAMPING:  2 1955

MONUMENTATION:           Survey Disk                               VM#:     2044
AGENCY:                                                            PID#:  AC8619
SETTING CLASSIFICATION:  Concrete Retaining Wall


The bench mark is set flush in top of a 3 foot (1 m) concrete retaining wall,
south of the State Pier Warehouse, 44.5 feet (13.6 m) south of the north end of
the retaining wall, 44.5 feet (13.6 m) SE of the SE corner of the warehouse, and
35.5 feet (10.8 m) north of the south end of the retaining wall.



                         BENCH MARK STAMPING:  7386 D 1977

MONUMENTATION:           Survey Disk                               VM#:     2045
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in the concrete seawall extending from the snack bar
to the pathway to the ships at the east side of the pier, 124 feet (38 m) SSE
from the east end of the seawall and 30.2 feet (9.2 m) east from a bridge
support.



                         BENCH MARK STAMPING:  7386 E 1977

MONUMENTATION:           Survey Disk                               VM#:     2046
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Block


The bench mark is set flush in a concrete block supporting 2 bollards at the SE
end of the pier, 87 feet (27 m) SSE from the fenced entrance to the ships, 18
feet (5 m) NE of the pathway leading to the ships, and 9 feet (3 m) SW of the
east edge of the pier.

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

                                                   PUBLICATION DATE:  10/30/1985
Station ID: 8447386                                SUPERCEDED DATE:   04/21/2003
Name:       FALL RIVER, STATE PIER, MOUNT HOPE BAY            
            MASSACHUSETTS
NOAA Chart: 13221                                  Latitude:         41° 42.2' N
USGS Quad:  FALL RIVER                             Longitude:        71°  9.9' W


                            T I D A L   D A T U M S 


Tidal datums at FALL RIVER, STATE PIER, MOUNT HOPE BAY based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           OCTOBER 1977
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8454000 PROVIDENCE, RI


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

     HIGHEST OBSERVED WATER LEVEL (10/15/1977)         =   6.73
     MEAN HIGHER HIGH WATER                     MHHW   =   4.90
     MEAN HIGH WATER                            MHW    =   4.62
     MEAN TIDE LEVEL                            MTL    =   2.39
     MEAN LOW WATER                             MLW    =   0.16
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (09/15/1977)         =  -0.95

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     0                                           0.00      0.00
     1 1955                                     12.93      8.31
     2 1955                                     11.59      6.97
     7386 D 1977                                 9.67      5.05
     7386 E 1977                                 7.84      3.22


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

                                                   PUBLICATION DATE:  10/30/1985
Station ID: 8447386                                SUPERCEDED DATE:   04/21/2003
Name:       FALL RIVER, STATE PIER, MOUNT HOPE BAY            
            MASSACHUSETTS
NOAA Chart: 13221                                  Latitude:         41° 42.2' N
USGS Quad:  FALL RIVER                             Longitude:        71°  9.9' 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.

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