U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8656502 PUBLICATION DATE: 04/21/2003
Name: MOREHEAD CITY HARBOR, HARBOR CHANNEL
NC
NOAA Chart: 11545 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 43.6' W ( -76.72670)
To reach the tidal bench marks from the intersection of US Highway 70 East and
7th Street in Morehead City, proceed south on 7th Street to Evans Street and the
BP Oil docks. The bench marks are located along Evans Street and US Highway 70
between 7th and 8th Streets. The tide gage was located on the BP Oil dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6502 A 1996
DESIGNATION: 865 6502 A
MONUMENTATION: Bench Mark disk VM#: 13337
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 34° 43.2' N ( 34.72000) LONGITUDE: 76° 42.6' W ( -76.71000)
The primary bench mark is a disk set in top of a concrete sea wall at the BP Oil
docks, on the west side of the office building for the docks, 12.98 m (42.6 ft)
south of the centerline of Evans Street, 11.22 m (36.8 ft) SE of a black metal
light pole No. NOK58, 5.94 m (19.5 ft) west of the NE corner of the building,
and 0.15 m (0.5 ft) north of the south edge of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8656502 PUBLICATION DATE: 04/21/2003
Name: MOREHEAD CITY HARBOR, HARBOR CHANNEL
NC
NOAA Chart: 11545 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 43.6' W ( -76.72670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: B M 1 1927
DESIGNATION: TIDAL 1 STA 39
MONUMENTATION: Tidal Station disk VM#: 13334
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EA0115
SETTING CLASSIFICATION: Concrete wall OPUS PID:
LATITUDE: 34° 43.2' N ( 34.72000) LONGITUDE: 76° 42.7' W ( -76.71170)
The bench mark is a disk set on top of a 0.76 m (2.5 ft) high concrete wall at
the south end of a porch at the 8th Street entrance to the Morehead City Police
Station, on the SW corner of 8th and Evans Streets, 24.69 m (81.0 ft) south of
the south curb line of Evans Street, 8.23 m (27.0 ft) west of the west curb line
of 8th Street, 0.61 m (2.0 ft) east of the east face of the building, and 1.22 m
(4.0 ft) above street level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8656502 PUBLICATION DATE: 04/21/2003
Name: MOREHEAD CITY HARBOR, HARBOR CHANNEL
NC
NOAA Chart: 11545 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 43.6' W ( -76.72670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: B M 3 1927
DESIGNATION: TIDAL 3 STA 39
MONUMENTATION: Tidal Station disk VM#: 13335
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EA0114
SETTING CLASSIFICATION: Rock footing OPUS PID:
LATITUDE: 34° 43.2' N ( 34.72000) LONGITUDE: 76° 42.7' W ( -76.71170)
The bench mark is a disk set vertically in the south face of a rock base to a
1.22 m (4.0 ft) square brick pillow at the NW corner of Cheeks Antiques and Fine
Collectables at the SE corner of 8th and Arendel Streets, 5.49 m (18.0 ft) south
of the south curb line of Arendel Street, 2.74 m (9.0 ft) east of the east curb
line of 8th Street, and 0.91 m (3.0 ft) above street level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8656502 PUBLICATION DATE: 04/21/2003
Name: MOREHEAD CITY HARBOR, HARBOR CHANNEL
NC
NOAA Chart: 11545 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 43.6' W ( -76.72670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: K 103 1963
DESIGNATION: K 103
MONUMENTATION: Bench Mark disk VM#: 13336
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EA0113
SETTING CLASSIFICATION: Wall OPUS PID:
LATITUDE: 34° 43.3' N ( 34.72170) LONGITUDE: 76° 42.7' W ( -76.71170)
The bench mark is a disk set vertically in the east face of the SE corner of the
Morehead City Post Office, along Arendell Street (US Highway 70 East) between
7th and 8th Streets, 9.45 m (31.0 ft) north of the north curb line of Arendell
Street, 1.37 m (4.5 ft) north of the SE corner, and 0.61 m (2.0 ft) above the
street.
BENCH MARK STAMPING: 6502 B 1996
DESIGNATION: 865 6502 B
MONUMENTATION: Bench Mark disk VM#: 13338
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: DJ9298
LATITUDE: 34° 43.2' N ( 34.71988) LONGITUDE: 76° 42.7' W ( -76.71218)
The bench mark is a disk set in the concrete sea wall on the west side of Ottis
Fish Market, 37.09 m (121.7 ft) ESE of the NE corner of the Olympus Dive Shop,
10.21 m (33.5 ft) SE of the centerline of Evans Street, 3.14 m (10.3 ft) west of
the NW corner of Ottis Fish Market, and 0.15 m (0.5 ft) east of the west edge of
the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8656502 PUBLICATION DATE: 04/21/2003
Name: MOREHEAD CITY HARBOR, HARBOR CHANNEL
NC
NOAA Chart: 11545 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 43.6' W ( -76.72670)
T I D A L D A T U M S
Tidal datums at MOREHEAD CITY HARBOR, HARBOR CHANNEL based on:
LENGTH OF SERIES: 4 Months
TIME PERIOD: May 1996 - August 1996
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 = 1.065
MEAN HIGH WATER MHW = 0.982
North American Vertical Datum NAVD88 = 0.642
MEAN SEA LEVEL MSL = 0.524
MEAN TIDE LEVEL MTL = 0.513
MEAN LOW WATER MLW = 0.043
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6502 A 1996 1.987 1.005
B M 1 1927 3.012 2.030
B M 3 1927 4.387 3.405
K 103 1963 4.307 3.325
6502 B 1996 1.904 0.922
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8656502 PUBLICATION DATE: 04/21/2003
Name: MOREHEAD CITY HARBOR, HARBOR CHANNEL
NC
NOAA Chart: 11545 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 43.6' W ( -76.72670)
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.