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National Ocean Service
Datums Page Page 1 of 6
Station ID: 8656841 PUBLICATION DATE: 10/15/2004
Name: CAPE LOOKOUT, LOOKOUT BIGHT
NC
NOAA Chart: 11545 Latitude: 34° 36.8' N ( 34.61330)
USGS Quad: CAPE LOOKOUT Longitude: 76° 32.3' W ( -76.53830)
To reach the tidal bench marks from Shell Point on Harkers Island, proceed by
boat SSW for about 8.9 km (4.8 nm) through Barden Inlet to the Coast Guard pier
near Catfish Point on Cape Lookout. The bench marks are near the pier, along
the concrete road leading to the Coast Guard Station and within the Coast Guard
compound about 0.6 km (0.4 mi) south of the pier. The tide station was on the
pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 2 1928
DESIGNATION: 865 6841 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 3568
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID:
SETTING CLASSIFICATION: Concrete cistern OPUS PID:
LATITUDE: 34° 36.8' N ( 34.61330) LONGITUDE: 76° 32.3' W ( -76.53830)
The primary bench mark is a disk set in the NW corner of a concrete cistern
located at the Lookout Bight Coast Guard station, 15 m (50 ft) NE of the main
building at the Coast Guard Station.
BENCH MARK STAMPING: SCR 296 1942
DESIGNATION: 296 USE
MONUMENTATION: Survey disk VM#: 3569
AGENCY: US Army Corps of Engineers (USE) IDB PID#: EA0197
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 34° 36.1' N ( 34.60170) LONGITUDE: 76° 32.5' W ( -76.54170)
The bench mark is a disk set in the top of a concrete monument in the center of
four concrete footings that apparently were the foundation of an observation
tower, about 0.2 km (0.1 mi) west of the Coast Guard Station, and 137 m (450 ft)
SW of the SW end of the concrete road leading to the Coast Guard docks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8656841 PUBLICATION DATE: 10/15/2004
Name: CAPE LOOKOUT, LOOKOUT BIGHT
NC
NOAA Chart: 11545 Latitude: 34° 36.8' N ( 34.61330)
USGS Quad: CAPE LOOKOUT Longitude: 76° 32.3' W ( -76.53830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 21 1969
DESIGNATION: 865 6841 TIDAL 21
MONUMENTATION: Tidal Station disk VM#: 3570
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID:
SETTING CLASSIFICATION: Concrete road OPUS PID:
LATITUDE: 34° 36.8' N ( 34.61330) LONGITUDE: 76° 32.3' W ( -76.53830)
The bench mark is a disk set in the concrete road leading from the pier to the
Coast Guard Station, 53 m (175 ft) south of the base of the pier, and along the
east edge of the road.
BENCH MARK STAMPING: 6841 A 1976
DESIGNATION: 865 6841 A
MONUMENTATION: Tidal Station disk VM#: 3571
AGENCY: National Ocean Survey (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete road OPUS PID:
LATITUDE: 34° 36.8' N ( 34.61330) LONGITUDE: 76° 32.3' W ( -76.53830)
The bench mark is a disk set in the NW corner of the concrete road where it
terminates at the SW corner of the Coast Guard pier, 56 m (185 ft) north of
bench mark NO 21 1969.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8656841 PUBLICATION DATE: 10/15/2004
Name: CAPE LOOKOUT, LOOKOUT BIGHT
NC
NOAA Chart: 11545 Latitude: 34° 36.8' N ( 34.61330)
USGS Quad: CAPE LOOKOUT Longitude: 76° 32.3' W ( -76.53830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6841 B 1976
DESIGNATION: 865 6841 B
MONUMENTATION: Tidal Station disk VM#: 3572
AGENCY: National Ocean Survey (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete road OPUS PID:
LATITUDE: 34° 36.8' N ( 34.61330) LONGITUDE: 76° 32.3' W ( -76.53830)
The bench mark is a disk set in the west side of the concrete road leading from
the pier to the beach, 229 m (750 ft) west of the generator house at the Coast
Guard station, and 10 m (33 ft) south of the split in the road, where the main
road turns east towards the Coast Guard station.
BENCH MARK STAMPING: 6841 C 1976
DESIGNATION: 865 6841 C
MONUMENTATION: Tidal Station disk VM#: 3573
AGENCY: National Ocean Survey (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID#: BBCJ86
LATITUDE: 34° 36.2' N ( 34.60333) LONGITUDE: 76° 32.3' W ( -76.53838)
The bench mark is a disk set in the SW corner of the concrete foundation for an
incinerator at the Coast Guard Station, 41 m (135 ft) west of the west side of
the mess hall, 9 m (28 ft) north of the centerline of the road leading to the
station parking lot, and 1 m (4 ft) NE of the SW corner of the foundation.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8656841 PUBLICATION DATE: 10/15/2004
Name: CAPE LOOKOUT, LOOKOUT BIGHT
NC
NOAA Chart: 11545 Latitude: 34° 36.8' N ( 34.61330)
USGS Quad: CAPE LOOKOUT Longitude: 76° 32.3' W ( -76.53830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6841 D 1976
DESIGNATION: 865 6841 D
MONUMENTATION: Tidal Station disk VM#: 3574
AGENCY: National Ocean Survey (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 34° 36.8' N ( 34.61330) LONGITUDE: 76° 32.3' W ( -76.53830)
The bench mark is a disk set in the top of a concrete foundation that previously
supported a boathouse, 48 m (156 ft) south of the south side of the mess hall,
29 m (96 ft) SE of the SE corner of the generator house, 17 m (56 ft) west of
the projected west mess hall wall, and 4 m (12 ft) south of a ramp.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8656841 PUBLICATION DATE: 10/15/2004
Name: CAPE LOOKOUT, LOOKOUT BIGHT
NC
NOAA Chart: 11545 Latitude: 34° 36.8' N ( 34.61330)
USGS Quad: CAPE LOOKOUT Longitude: 76° 32.3' W ( -76.53830)
T I D A L D A T U M S
Tidal datums at CAPE LOOKOUT, LOOKOUT BIGHT based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: March 1976 - April 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8656483 BEAUFORT, DUKE MARINE LAB
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.391
MEAN HIGH WATER MHW = 1.283
MEAN SEA LEVEL MSL = 0.669
MEAN TIDE LEVEL MTL = 0.666
MEAN LOW WATER MLW = 0.049
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 2 1928 2.856 1.573
SCR 296 1942 4.559 3.276
NO 21 1969 2.330 1.047
6841 A 1976 2.608 1.325
6841 B 1976 1.866 0.583
6841 C 1976 2.527 1.244
6841 D 1976 2.676 1.393
Foot Notes:
Bench Mark SCR 296 1942 has only one level run. Use with caution.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8656841 PUBLICATION DATE: 10/15/2004
Name: CAPE LOOKOUT, LOOKOUT BIGHT
NC
NOAA Chart: 11545 Latitude: 34° 36.8' N ( 34.61330)
USGS Quad: CAPE LOOKOUT Longitude: 76° 32.3' W ( -76.53830)
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.