U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8448376 PUBLICATION DATE: 07/15/2004
Name: CUTTYHUNK
MA
NOAA Chart: 13230 Latitude: 41° 25.5' N ( 41.42500)
USGS Quad: CUTTYHUNK Longitude: 70° 55.0' W ( -70.91670)
To reach the tidal bench marks from the U.S. Coast Guard Station at Cuttyhunk
Pond on Cuttyhunk Island, proceed by boat east on the Cuttyhunk Pond entrance
channel to the north jetty. The bench marks are located in the vicinity of the
west end of the north jetty. The bench marks are located in the vicinity of the
west end of the north jetty at the SE end of Copicut Neck. The tide gage and
staff were located near the north jetty light.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8376 D
DESIGNATION: 844 8376 D
MONUMENTATION: Tidal Station disk VM#: 2096
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete and rock OPUS PID:
LATITUDE: 41° 25.5' N ( 41.42500) LONGITUDE: 70° 55.0' W ( -70.91670)
The primary bench mark is a disk set in the west end of the concrete and rock
north jetty at the entrance to Cuttyhunk Pond (the mark may be periodically
covered by sand).
BENCH MARK STAMPING: 8376 E
DESIGNATION: 844 8376 E
MONUMENTATION: Tidal Station disk VM#: 2097
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified steel rod OPUS PID:
LATITUDE: 41° 25.5' N ( 41.42500) LONGITUDE: 70° 55.0' W ( -70.91670)
The bench mark is a disk located 91 m (297 ft) NW (300 magnetic) of Bench Mark
8376 D, and next to a witness post. The bench mark is crimped to an unspecified
steel rod driven 1.2 m (4 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8448376 PUBLICATION DATE: 07/15/2004
Name: CUTTYHUNK
MA
NOAA Chart: 13230 Latitude: 41° 25.5' N ( 41.42500)
USGS Quad: CUTTYHUNK Longitude: 70° 55.0' W ( -70.91670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8376 F
DESIGNATION: 844 8376 F
MONUMENTATION: Tidal Station disk VM#: 2098
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified steel rod OPUS PID:
LATITUDE: 41° 25.5' N ( 41.42500) LONGITUDE: 70° 55.0' W ( -70.91670)
The bench mark is a disk located 68 m (224 ft) NNW (335 magnetic) of Bench Mark
8376 E, 15 m (50 ft) SW of a rock beach, and next to a witness post. The bench
mark is crimped to an unspecified steel rod driven 1.2 m (4 ft).
BENCH MARK STAMPING: 8376 G
DESIGNATION: 844 8376 G
MONUMENTATION: Tidal Station disk VM#: 2099
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified steel rod OPUS PID:
LATITUDE: 41° 25.5' N ( 41.42500) LONGITUDE: 70° 55.0' W ( -70.91670)
The bench mark is a disk located 51 m (167 ft) SW (225 magnetic) of Bench Mark
8376 F, and next to a witness post. The bench mark is crimped to an unspecified
steel rod driven 1.2 m (4 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8448376 PUBLICATION DATE: 07/15/2004
Name: CUTTYHUNK
MA
NOAA Chart: 13230 Latitude: 41° 25.5' N ( 41.42500)
USGS Quad: CUTTYHUNK Longitude: 70° 55.0' W ( -70.91670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8376 H
DESIGNATION: 844 8376 H
MONUMENTATION: Tidal Station disk VM#: 2100
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified steel rod OPUS PID:
LATITUDE: 41° 25.5' N ( 41.42500) LONGITUDE: 70° 55.0' W ( -70.91670)
The bench mark is a disk located 65 m (213 ft) SE (135 magnetic) of Bench Mark
8376 G, 9 m (30 ft) north of the shoreline of the entrance channel, and next to
a witness post. The bench mark is crimped to an unspecified steel rod driven
1.2 m (4 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8448376 PUBLICATION DATE: 07/15/2004
Name: CUTTYHUNK
MA
NOAA Chart: 13230 Latitude: 41° 25.5' N ( 41.42500)
USGS Quad: CUTTYHUNK Longitude: 70° 55.0' W ( -70.91670)
T I D A L D A T U M S
Tidal datums at CUTTYHUNK based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: August 1976 - October 1976
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 = 1.136
MEAN HIGH WATER MHW = 1.064
MEAN TIDE LEVEL MTL = 0.551
MEAN SEA LEVEL MSL = 0.509
MEAN LOW WATER MLW = 0.038
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8376 D 1.937 0.873
8376 E 1.943 0.879
8376 F 2.446 1.382
8376 G 2.283 1.219
8376 H 2.733 1.669
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8448376 PUBLICATION DATE: 07/15/2004
Name: CUTTYHUNK
MA
NOAA Chart: 13230 Latitude: 41° 25.5' N ( 41.42500)
USGS Quad: CUTTYHUNK Longitude: 70° 55.0' W ( -70.91670)
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.