U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 5
Station ID: 8656084 PUBLICATION DATE: 03/16/2012
Name: CORE CREEK BRIDGE
NC
NOAA Chart: 11545 Latitude: 34° 49.5' N ( 34.82500)
USGS Quad: Core Creek Longitude: 76° 41.4' W ( -76.69000)
To reach the tidal bench marks from the intersection of US Highway 70 and State
Route 101 in Beaufort, proceed west on State Route 101 for 11.3 km (7.0 mi) to
Core Creek Road, turn right on a dirt and gravel road and go 0.5 km (0.3 mi) to
Bock Marine Builders Inc. sign on the left. The bench marks are in the vicinity
of Bock Marine property and at the east end of the old Core Creek Bridge. The
tide gage and staff were located on the dock of Bock Marine.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6084 B 1996
DESIGNATION: 865 6084 B
MONUMENTATION: Bench Mark disk VM#: 13342
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge pile OPUS PID:
LATITUDE: 34° 49.5' N ( 34.82500) LONGITUDE: 76° 41.4' W ( -76.69000)
The primary bench mark is a disk set vertically in the 4th bridge support east
of the waterway, 27.43 m (90.0 ft) west of the 5th support east of the water,
26.06 m (85.5 ft) east of the 3rd support east of the water, and 1.37 m (4.5 ft)
above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8656084 PUBLICATION DATE: 03/16/2012
Name: CORE CREEK BRIDGE
NC
NOAA Chart: 11545 Latitude: 34° 49.5' N ( 34.82500)
USGS Quad: Core Creek Longitude: 76° 41.4' W ( -76.69000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6084 A 1996
DESIGNATION: 865 6084 A
MONUMENTATION: Bench Mark disk VM#: 13343
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Pavements (street, sidewalk, curb,
apron, etc.) OPUS PID:
LATITUDE: 34° 49.4' N ( 34.82330) LONGITUDE: 76° 41.4' W ( -76.69000)
The bench mark is a disk set in the SW corner of a concrete pad for the boat
travel lift at Bock Marine Builders, 19.17 m (62.9 ft) east of the west end of
the metal ramp for the lift, 12.86 m (42.2 ft) west of the east end of the
concrete, and 0.24 m (0.8 ft) north of the south edge of the concrete.
BENCH MARK STAMPING: CORPS 7
DESIGNATION: 865 6084 NO 7
MONUMENTATION: Survey disk VM#: 13344
AGENCY: US Army Corps of Engineers (USE) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 34° 49.7' N ( 34.82830) LONGITUDE: 76° 41.4' W ( -76.69000)
The bench mark is a disk set in top of a concrete monument below the pavement at
the east end of the old State Route 101 bridge over Core Creek, 30.96 m (101.6
ft) NW of Bench Mark CORPS 9, 17.62 m (57.8 ft) SW of the north end of the road,
and 0.15 m (0.5 ft) below the pavement under a small manhole cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8656084 PUBLICATION DATE: 03/16/2012
Name: CORE CREEK BRIDGE
NC
NOAA Chart: 11545 Latitude: 34° 49.5' N ( 34.82500)
USGS Quad: Core Creek Longitude: 76° 41.4' W ( -76.69000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: CORPS 8
DESIGNATION: 865 6084 NO 8
MONUMENTATION: Survey disk VM#: 13345
AGENCY: US Army Corps of Engineers (USE) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 34° 49.7' N ( 34.82830) LONGITUDE: 76° 41.4' W ( -76.69000)
The bench mark is a disk set in top of a concrete monument below the pavement at
the east end of the State Route 101 bridge over Core Creek, 30.97 m (101.6 ft)
NE of Bench Mark CORPS 9, 17.62 m (57.8 ft) SE of the north end of the road, 5.5
m (18.2 ft) NE of Bench Mark CORPS 7, and 0.15 m (0.5 ft) below the pavement
under a small manhole cover.
BENCH MARK STAMPING: CORPS 9
DESIGNATION: 865 6084 NO 9
MONUMENTATION: Survey disk VM#: 13346
AGENCY: US Army Corps of Engineers (USE) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 34° 49.6' N ( 34.82670) LONGITUDE: 76° 41.4' W ( -76.69000)
The bench mark is a disk set in top of a concrete monument under the pavement at
the east end of the State Route 101 bridge over Core Creek, 30.97 m (101.6 ft)
SE of Bench Mark CORPS 7, 25.48 m (83.6 ft) west of a road barricade, 5.09 m
(16.7 ft) south of the north edge of the pavement, and 0.15 m (0.5 ft) below the
pavement under a small manhole cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8656084 PUBLICATION DATE: 03/16/2012
Name: CORE CREEK BRIDGE
NC
NOAA Chart: 11545 Latitude: 34° 49.5' N ( 34.82500)
USGS Quad: Core Creek Longitude: 76° 41.4' W ( -76.69000)
T I D A L D A T U M S
Tidal datums at CORE CREEK BRIDGE 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 = 0.758
MEAN HIGH WATER MHW = 0.687
MEAN TIDE LEVEL MTL = 0.357
MEAN SEA LEVEL MSL = 0.341
MEAN LOW WATER MLW = 0.027
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6084 B 1996 3.020 2.333
6084 A 1996 1.727 1.040
CORPS 7 5.903 5.216
CORPS 8 5.834 5.147
CORPS 9 5.283 4.596
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8656084 PUBLICATION DATE: 03/16/2012
Name: CORE CREEK BRIDGE
NC
NOAA Chart: 11545 Latitude: 34° 49.5' N ( 34.82500)
USGS Quad: Core Creek Longitude: 76° 41.4' W ( -76.69000)
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.