U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8652648 PUBLICATION DATE: 02/05/2004
Name: OLD HOUSE CHANNEL, PAMLICO SOUND
NC
NOAA Chart: 12205 Latitude: 35° 46.6' N ( 35.77670)
USGS Quad: OREGON INLET Longitude: 75° 35.1' W ( -75.58500)
To reach the tidal bench marks from the Oregon Inlet Fishing Center at the north
end of the State Highway 12 bridge over Oregon Inlet, proceed by boat SW through
Walter Slough, then bear left at the SW end of Walter Slough and continue SSW
through Oregon Inlet Channel. Channel access to the dock on the spoil island is
in the vicinity of day marker #41 and buoy #40 in Oregon Inlet Channel. The
bench marks are found in an alignment range formed by the nine pilings that are
set along the NW side of the wood dock on the NE side of the island. Before
accessing the island, obtain permission from Mr. Bill Boykin at 252-473-4824 ro
252-531-4333. The tide gauge was located on the end of the T-dock on the NE
side of the island.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2648 A 2002
DESIGNATION: 865 2648 A
MONUMENTATION: Flange-encased Rod VM#: 16755
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 35° 46.6' N ( 35.77670) LONGITUDE: 75° 35.1' W ( -75.58500)
The primary bench mark is a flange-encased rod set on the NE side of the island
in the vicinity of the wood dock, 61.51 m (201.8 ft) NE of bench mark (2648 B
2002), 20.60 m (67.6 ft) SW of the SW corner of the dock, 1.49 m (4.9 ft) NE of
an orange NOS witness post, SSE (175 magnetic) to the NNE roof peak of the
island's only house, and NNE (035 magnetic) to the Bodie Island lighthouse.
The datum point is set 9 cm (0.3 ft) below grade, being the top of a stainless
steel rod driven 23.7 m (78 ft) to substantial resistance and encased in a
5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8652648 PUBLICATION DATE: 02/05/2004
Name: OLD HOUSE CHANNEL, PAMLICO SOUND
NC
NOAA Chart: 12205 Latitude: 35° 46.6' N ( 35.77670)
USGS Quad: OREGON INLET Longitude: 75° 35.1' W ( -75.58500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2648 B 2002
DESIGNATION: 865 2648 B
MONUMENTATION: Flange-encased Rod VM#: 16756
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBCL77
LATITUDE: 35° 46.5' N ( 35.77500) LONGITUDE: 75° 35.1' W ( -75.58500)
The bench mark is a flange-encased rod set on the NE side of the island, 61.51 m
(201.8 ft) SW of bench mark 2648 A 2002, 62.45 m (205.2 ft) NE of bench mark
2648 C 2002, 1.58 m (5.2 ft) east of an orange NOS witness post, SSE (155
magnetic) to the NNE roof peak of the island's only house, and NNE (35
magnetic) to the Bodie Island lighthouse. The datum point is set 9 cm (0.3 ft)
below grade, being the top of a stainless steel rod driven 24.9 m (82 ft) to
substantial resistance and encased in a 5-inch NOS logo cap.
BENCH MARK STAMPING: 2648 C 2002
DESIGNATION: 865 2648 C
MONUMENTATION: Flange-encased Rod VM#: 16757
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 35° 46.5' N ( 35.77500) LONGITUDE: 75° 35.1' W ( -75.58500)
The bench mark is a flange-encased rod set on the NE side of the island, 62.45 m
(205.2 ft) SW of bench mark 2648 B 2002, 63.58 m (208.6 ft) NE of NOS bench mark
2648 D 2002, 1.61 m (5.3 ft) NE of an orange NOS witness post, SE (125
magnetic) to the NNE roof peak of the island's only house, and NNE (35
magnetic) to the Bodie Island lighthouse. The datum point is set 9 cm (0.3 ft)
below grade, being the top of a stainless steel rod driven 23.5 m (77 ft) to
substantial resistance and encased in a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8652648 PUBLICATION DATE: 02/05/2004
Name: OLD HOUSE CHANNEL, PAMLICO SOUND
NC
NOAA Chart: 12205 Latitude: 35° 46.6' N ( 35.77670)
USGS Quad: OREGON INLET Longitude: 75° 35.1' W ( -75.58500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2648 D 2002
DESIGNATION: 865 2468 D
MONUMENTATION: Flange-encased Rod VM#: 16758
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 35° 29.7' N ( 35.49500) LONGITUDE: 75° 39.2' W ( -75.65330)
The bench mark is a flange-encased rod set near the center of the island, 63.58
m (208.6 ft) SW of bench mark 2648 C 2002, 63.52 m (208.4 ft) (slope distance),
NE of bench mark 2648 E 2002, 1.0 m (3 ft) NE of an orange NOS witness post, ESE
(100 magnetic) to the NNE roof peak of the island's only house, and NNE (35
magnetic) to the Bodie Island lighthouse. The datum point is set 12 cm (0.4 ft)
below grade, being the top of a stainless steel rod driven 21.0 m (69 ft) to
substantial resistance and encased in a 5-inch NOS logo cap.
BENCH MARK STAMPING: 2648 E 2002
DESIGNATION: 865 2648 E
MONUMENTATION: Flange-encased Rod VM#: 16759
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 35° 29.5' N ( 35.49170) LONGITUDE: 75° 39.2' W ( -75.65330)
The bench mark is a flange-encased rod set near the center of the island, 63.52
m (208.4 ft) (slope distance), SW of bench mark 2648 D 2002, 0.79 m (2.6 ft) NE
of an orange NOS witness post, east (90 magnetic) to the NNE roof peak of the
island's only house, and NNE (35 magnetic) to the Bodie Island lighthouse. The
datum point is set 9 cm (0.3 ft) below grade, being the top of a stainless steel
rod driven 23.5 m (77 ft) to substantial resistance and encased in a 5-inch NOS
logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8652648 PUBLICATION DATE: 02/05/2004
Name: OLD HOUSE CHANNEL, PAMLICO SOUND
NC
NOAA Chart: 12205 Latitude: 35° 46.6' N ( 35.77670)
USGS Quad: OREGON INLET Longitude: 75° 35.1' W ( -75.58500)
T I D A L D A T U M S
Tidal datums at OLD HOUSE CHANNEL, PAMLICO SOUND based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: June 2002 - September 2002
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8652587 OREGON INLET MARINA, PAMLICO SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.275
MEAN HIGH WATER MHW = 0.235
MEAN SEA LEVEL MSL = 0.140
MEAN TIDE LEVEL MTL = 0.136
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
2648 A 2002 0.811 0.576
2648 B 2002 1.673 1.438
2648 C 2002 2.708 2.473
2648 D 2002 3.525 3.290
2648 E 2002 5.438 5.203
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8652648 PUBLICATION DATE: 02/05/2004
Name: OLD HOUSE CHANNEL, PAMLICO SOUND
NC
NOAA Chart: 12205 Latitude: 35° 46.6' N ( 35.77670)
USGS Quad: OREGON INLET Longitude: 75° 35.1' W ( -75.58500)
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.