U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8656201 PUBLICATION DATE: 12/04/2012
Name: CORE SOUND
NC
NOAA Chart: 11545 Latitude: 34° 47.8' N ( 34.79675)
USGS Quad: DAVIS Longitude: 76° 27.3' W ( -76.45547)
To reach the tidal bench marks from Beaufort-Morehead City airport in Morehead
City North Carolina, proceed SE on Airport Rd for 0.3 km (0.2 mi) to the
intersection with Highway 101, turn right and proceed SSE on Highway 101 1.1 km
(0.7 mi) to the intersection with Highway 70 (Live Oak Street), turn left and
proceed north on Highway 70 (Live Oak Street) for 7.0 km (4.3 mi) to the
intersection with Merrimon Road (a natural extension of Highway 70 (Live Oak
Street), turn right and continue SE on Highway 70 for 10.3 km (6.4 mi) to the
intersection with Marshallberg Road in Smyrna, North Carolina, turn left and
continue NE?ly on Highway 70 for 9.9 km (6.2 mi ) to the intersection with
Community Road in Davis, North Carolina, then continue east onto Horseshoe Road
and then Grady Davis Lane for 0.4 km (0.3 mi) to the ferry dock. The bench
marks are in the vicinity of the ferry dock and along Horseshoe Road. The tide
gauge is located on the foot dock east of the ferry dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6201 B 2012
DESIGNATION: 865 6201 B
MONUMENTATION: Metal Rod VM#: 20377
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Flange-encased rod. OPUS PID#: BBCS41
LATITUDE: 34° 47.8' N ( 34.79739) LONGITUDE: 76° 27.4' W ( -76.45611)
The primary bench mark is a flange-encased rod located near a seawall in the
northwest corner of the Cape Lookout cabins and camp s ferry service parking
area, 45.43 m (149.0 ft)west of the stairs to a store, 42.12 m (138.2 ft) north
of the center of the north edge of the metal grate at the ferry ramp, 41.28 m
(135.4 ft)north-northeast of the southeast corner of a white cinderblock house,
9.62 m (31.6 ft)west of a 30-degree bend in the parking area seawall, 1.50 m
(4.9 ft)south of a corner in the seawall and 0.93 m (3.1 ft) south of a 6 x 6
timber post for a rope railing. The datum point is set 26 cm (0.9 ft) below
grade, being the top of a stainless steel rod driven 29.3 m (96.1 ft) to
substantial resistance, in a sleeve extending to a depth of 0.9 m (3.0 ft) and
encased in a 5-inch National Geodetic Survey logo cap with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8656201 PUBLICATION DATE: 12/04/2012
Name: CORE SOUND
NC
NOAA Chart: 11545 Latitude: 34° 47.8' N ( 34.79675)
USGS Quad: DAVIS Longitude: 76° 27.3' W ( -76.45547)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6201 C 2012
DESIGNATION: 865 6201 C
MONUMENTATION: Bench Mark disk VM#: 20378
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Disk set in concrete seawall. OPUS PID:
LATITUDE: 34° 47.8' N ( 34.79703) LONGITUDE: 76° 27.4' W ( -76.45669)
The bench mark is a disk set in the top of a concrete seawall, 17.73 m (58.2 ft)
west of power pole cb38 near the northwest corner of a white house, 17.01 m
(55.8 ft) southeast of power pole cb37 on the south side of the road near the
street intersection, 14.42 m (47.3 ft) northwest of the southwest corner of a
white house, 10.25 m (33.6 ft) southeast of the northwest end of the seawall and
0.43 m (1.4 ft)
BENCH MARK STAMPING: 6201 D 2012
DESIGNATION: 865 6201 D
MONUMENTATION: See descriptive text VM#: 20379
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Flange-encased rod. OPUS PID:
LATITUDE: 34° 47.9' N ( 34.79789) LONGITUDE: 76° 27.6' W ( -76.45964)
The bench mark is a flange-encased rod located in the northeast corner of the
intersection of Highway 70 and community road, 49.64 m (162.9 ft) northwest of
power pole CB30, 30.90 m (101.4 ft) north of a flag pole in a small park in the
southeast corner of the intersection, 13.65 m (44.8 ft) east of the intersection
centerline, 7.45 m (24.4 ft) south of a black steel groundwater monitoring well
and 3.41 m (11.2 ft) east-northeast of a wooden telephone pole. The datum point
is set 14 cm (0.5 ft) below grade, being the top of a stainless steel rod driven
22.3 m (73.2 ft) to refusal, in a sleeve extending to a depth of 0.9 m (3.0 ft)
and encased in a 5-inch National Geodetic Survey logo cap with concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8656201 PUBLICATION DATE: 12/04/2012
Name: CORE SOUND
NC
NOAA Chart: 11545 Latitude: 34° 47.8' N ( 34.79675)
USGS Quad: DAVIS Longitude: 76° 27.3' W ( -76.45547)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6201 A 2012
DESIGNATION: 865 6201 A
MONUMENTATION: Bench Mark disk VM#: 20380
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Disk set in concrete seawall. OPUS PID:
LATITUDE: 34° 47.8' N ( 34.79703) LONGITUDE: 76° 27.3' W ( -76.45556)
The bench mark is a disk set in the top of a concrete seawall, 43.91 m (144.1
ft) east of the ferry loading ramp, 17.76 m (58.3 ft) west-southwest of the
southeast end of the seawall, 13.89 m (45.6 ft) south-southwest of the southeast
corner of the store, 1.75 m (5.7 ft) east the outside corner of a 30-degree bend
in the seawall and 0.61 m (2.0 ft) east of the wooden post for the railing on
the east side of the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8656201 PUBLICATION DATE: 12/04/2012
Name: CORE SOUND
NC
NOAA Chart: 11545 Latitude: 34° 47.8' N ( 34.79675)
USGS Quad: DAVIS Longitude: 76° 27.3' W ( -76.45547)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: CAR 62 1982
DESIGNATION: CAR 62
MONUMENTATION: Bench Mark disk VM#: 20382
AGENCY: NOS IDB PID#: EA1526
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 34° 48.1' N ( 34.80108) LONGITUDE: 76° 28.0' W ( -76.46683)
The bench mark is a disk located on the southeast side of the Free Will Baptist
Church driveway, 24.08 m (79.0 ft) north-northeast of the northwest corner of
the church, 23.47 m (77.0 ft) west of western end of driveway culvert, 21.74 m
(71.3 ft) north of wooden light pole cb78, 17.67 m (58.0 ft) south-southwest of
the centerline of highway 70, 1.19 m (3.9 ft) southwest of the north end of the
brick foundation for the church sign and 0.15 m (0.5 ft) below grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8656201 PUBLICATION DATE: 12/04/2012
Name: CORE SOUND
NC
NOAA Chart: 11545 Latitude: 34° 47.8' N ( 34.79675)
USGS Quad: DAVIS Longitude: 76° 27.3' W ( -76.45547)
T I D A L D A T U M S
Tidal datums at CORE SOUND based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: April 2012 - July 2012
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 = 0.405
MEAN HIGH WATER MHW = 0.359
MEAN TIDE LEVEL MTL = 0.194
MEAN SEA LEVEL MSL = 0.193
MEAN LOW WATER MLW = 0.028
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6201 B 2012 1.290 0.931
6201 C 2012 1.262 0.903
6201 D 2012 1.267 0.908
6201 A 2012 1.516 1.157
CAR 62 1982 0.881 0.522
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8656201 PUBLICATION DATE: 12/04/2012
Name: CORE SOUND
NC
NOAA Chart: 11545 Latitude: 34° 47.8' N ( 34.79675)
USGS Quad: DAVIS Longitude: 76° 27.3' W ( -76.45547)
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.