U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 05/09/2000
Station ID: 8447241 SUPERCEDED DATE: 04/21/2003
Name: SESUIT HARBOR, EAST DENNIS
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 45.1' N
USGS Quad: DENNIS Longitude: 70° 9.3' W
To reach the bench marks from the intersection of Bridge Street (Route 134) and
Route 6, proceed north on Bridge Street for 5.3 km (3.3 mi) to the intersection
of Route 6A and Bridge Street, then continue north on Bridge Street for 0.6 km
(0.4 mi) to Sesuit Neck Road, proceed NW on Sesuit Neck Road for 1.0 km (0.6 mi)
to the Town of Dennis Municipal Dock. The bench marks are in the vicinity of
the town dock and the adjacent Northside Marina, and the tide gauge and staff
were on the east end of the town dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7241 A 1993
DESIGNATION: 844 7241 A
MONUMENTATION: Tidal Station disk VM#: 12466
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete footing
The primary bench mark is a disk set in the concrete footing of the SW corner of
the southermost building at the Northside Marina, 37 m (121 ft) west of the SE
corner of the building, 23 m (75 ft) north of the center of the boat ramp, 0.43
m (1.4 ft) ESE of the SW corner of the building, and 0.18 m (0.6 ft) above
ground.
BENCH MARK STAMPING: 7241 B 1993
DESIGNATION: 844 7241 B
MONUMENTATION: Tidal Station disk VM#: 12467
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the concrete sea wall at the NE end of Northside
Marina, 39.78 m (130.5 ft) north of the north edge of the boat deployment dock,
27.58 m (90.5 ft) ENE of the NE corner of the northernmost building of the
marina, 0.09 m (0.3 ft) ESE of the north edge of the seawall, and 0.06 m (0.2
ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 05/09/2000
Station ID: 8447241 SUPERCEDED DATE: 04/21/2003
Name: SESUIT HARBOR, EAST DENNIS
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 45.1' N
USGS Quad: DENNIS Longitude: 70° 9.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7241 C 1993
DESIGNATION: 844 7241 C
MONUMENTATION: Tidal Station disk VM#: 12468
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete wall
The bench mark is a disk set in the top of the south wall of the Dennis Yacht
Club tennis courts, 28.56 m (93.7 ft) east of the west corner of the south wall,
2.68 m (8.8 ft) west of the east corner of the south wall, 0.06 m (0.2 ft) NW of
the south edge of the wall, and 1 m (3 ft) above the tennis court.
BENCH MARK STAMPING: 7241 D 1993
DESIGNATION: 844 7241 D
MONUMENTATION: Tidal Station disk VM#: 12469
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Bedrock outcrop
The bench mark is a disk set in the top of a bedrock outcrop on the west side of
Sesuit Neck Road, 17 m (56 ft) WSW of utility pole #24, 9 m (29 ft) west of the
road centerline, 0.85 m (2.8 ft) east of the west point of the outcrop, and 2 m
(6 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 05/09/2000
Station ID: 8447241 SUPERCEDED DATE: 04/21/2003
Name: SESUIT HARBOR, EAST DENNIS
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 45.1' N
USGS Quad: DENNIS Longitude: 70° 9.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 1974
DESIGNATION: 844 7241 COE D
MONUMENTATION: Survey disk VM#: 12470
AGENCY: US Army Corps of Engineers (COE) PID:
SETTING CLASSIFICATION: Concrete fence post
The bench mark is a disk set in top of a fence post located on the SE side of
Sesuit Neck Road, 16.89 m (55.4 ft) WSW of utility pole 72/20A along the NW edge
of the Municipal Pier parking lot, 11.28 m (37.0 ft) SE of the road centerline,
3.51 m (11.5 ft) ESE of the SE corner of the Shiverick Shipyard monument, and
0.88 m (2.9 ft) above ground.
BENCH MARK STAMPING: 139G
DESIGNATION: 844 7241 139G
MONUMENTATION: Traverse Station disk VM#: 12471
AGENCY: Massachusetts Department of Public Works
(MDPW) PID:
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set in a 0.27 m (0.9 ft) diameter concrete monument
located on the west side of State Route 134 south of the intersection of Route
134 and State Route 6A in the town of East Dennis, 19.32 m (63.4 ft) SW of a
nail in power pole No. 36/449, 11.73 m (38.5 ft) north of a nail in light pole
No. 37C/234, 11 m (36 ft) south of Route 6A, 9.08 m (29.8 ft) NE of the corner
of Clear View Cottage, 6 m (20 ft) west of Route 134, and 0.03 m (0.1 ft) below
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 05/09/2000
Station ID: 8447241 SUPERCEDED DATE: 04/21/2003
Name: SESUIT HARBOR, EAST DENNIS
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 45.1' N
USGS Quad: DENNIS Longitude: 70° 9.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 844 7241 NO STAMPING 1
ALIAS: NO STAMPING 1
MONUMENTATION: Survey disk VM#: 12480
AGENCY: US Army Corps of Engineers (COE) PID:
SETTING CLASSIFICATION: Concrete base
The bench mark is a disk set in a flagpole base at the NE end of Northside
Marina, 15.64 m (51.3 ft) SE of the southern fuel pump, 5.58 m (18.3 ft) north
of the east end of the concrete seawall, and 0.30 m (1.0 ft) west of the
flagpole.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 05/09/2000
Station ID: 8447241 SUPERCEDED DATE: 04/21/2003
Name: SESUIT HARBOR, EAST DENNIS
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 45.1' N
USGS Quad: DENNIS Longitude: 70° 9.3' W
T I D A L D A T U M S
Tidal datums at SESUIT HARBOR, EAST DENNIS based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: May 1993 - July 1993
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8443970 BOSTON, BOSTON HARBOR
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 3.208
MEAN HIGH WATER MHW = 3.071
MEAN SEA LEVEL MSL = 1.599
MEAN TIDE LEVEL MTL = 1.578
MEAN LOW WATER MLW = 0.085
MEAN LOWER LOW WATER MLLW = 0.000
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7241 A 1993 4.974 1.903
7241 B 1993 4.798 1.727
7241 C 1993 6.543 3.472
7241 D 1993 6.452 3.381
D 1974 9.134 6.063
139G 10.828 7.757
844 7241 NO STAMPING 1 4.158 1.087
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 05/09/2000
Station ID: 8447241 SUPERCEDED DATE: 04/21/2003
Name: SESUIT HARBOR, EAST DENNIS
MASSACHUSETTS
NOAA Chart: 13246 Latitude: 41° 45.1' N
USGS Quad: DENNIS Longitude: 70° 9.3' 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.