U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8652437 PUBLICATION DATE: 10/30/2003
Name: OYSTER CREEK, CROATAN SOUND
NC
NOAA Chart: 12205 Latitude: 35° 50.7' N ( 35.84500)
USGS Quad: WANCHESE Longitude: 75° 39.3' W ( -75.65500)
To reach the tidal bench marks from the Wanchese, NC post office, proceed NW
along Mill Landing Road (SR 345) for 0.5 km (0.3 mi) and bear left onto Old
Wharf Road (SR 1168), then west along Old Wharf Road for 1.4 km (0.9 mi) and
turn right onto Owens Shipyard Road (SR 1137), then continue NW on Owens
Shipyard Road for 0.3 km (0.2 mi) and bear right onto Beverly Drive (SR 1183).
The bench marks are located on and adjacent to the Spencer Marine property at 31
Beverly Drive. The tide gauge was located on the NW corner of the Spencer
Marine property on the dock along Oyster Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2437 A 2002
DESIGNATION: 865 2437 A
MONUMENTATION: Flange-encased Rod VM#: 16749
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 35° 50.7' N ( 35.84500) LONGITUDE: 75° 39.3' W ( -75.65500)
The primary bench mark is a flange-encased rod set on the NW corner of the
Spencer Marine property at the brush/tree line, 34.78 m (114.1 ft) WSW of the NW
corner of a blue, metal clad boat shed, 5.67 m (18.6 ft) south of the south edge
of Oyster Creek, and 0.73 m (2.4 ft) ENE of an orange NOS witness post. The
datum point is set 6 cm (0.2 ft) below grade, being the top of a stainless steel
rod driven 30.5 m (100 ft) to refusal and encased with a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8652437 PUBLICATION DATE: 10/30/2003
Name: OYSTER CREEK, CROATAN SOUND
NC
NOAA Chart: 12205 Latitude: 35° 50.7' N ( 35.84500)
USGS Quad: WANCHESE Longitude: 75° 39.3' W ( -75.65500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2437 B 2002
DESIGNATION: 865 2437 B
MONUMENTATION: Flange-encased Rod VM#: 16750
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 35° 50.6' N ( 35.84330) LONGITUDE: 75° 39.3' W ( -75.65500)
The bench mark is a flange-encased rod set on the west side of the Spencer
Marine property just west of the marina office, 45.04 m (147.8 ft) ENE of the
brush/tree line on the west edge of the Spencer Marine property, 6.74 m (22.1
ft) NNW of the SW corner of the marina office, and 1.86 m (6.1 ft) south of the
NW corner of the marina office. The datum point is set 9 cm (0.3 ft) below
grade, being the top of a stainless steel rod driven 30.8 m (101 ft) to
substantial resistance and encased by a 5-inch NOS logo cap.
BENCH MARK STAMPING: 2437 C 2002
DESIGNATION: 865 2437 C
MONUMENTATION: Flange-encased Rod VM#: 16751
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: DH6243
LATITUDE: 35° 50.6' N ( 35.84330) LONGITUDE: 75° 39.3' W ( -75.65500)
The bench mark is a flange-encased rod set in the south corner of the Spencer
Marine property adjacent to a chain-link security fence, 43.77 m (143.6 ft) west
of the south corner of a concrete block enclosure attached to the south corner
of the tall, blue, metal clad boat sheds, 21.67 m (71.1 ft) NNW of the south
corner of the chain-link security fence at the south corner of the Spencer
Marine property, and 0.76 m (2.5 ft) ENE of the chain-link security fence and
orange NOS witness post attached to the fence. The datum point is set 9 cm (0.3
ft) below grade, being the top of a stainless steel rod driven 8.8 m (29 ft) to
refusal and encased by a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8652437 PUBLICATION DATE: 10/30/2003
Name: OYSTER CREEK, CROATAN SOUND
NC
NOAA Chart: 12205 Latitude: 35° 50.7' N ( 35.84500)
USGS Quad: WANCHESE Longitude: 75° 39.3' W ( -75.65500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2437 D 2002
DESIGNATION: 865 2437 D
MONUMENTATION: Tidal Station disk VM#: 16752
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 35° 50.6' N ( 35.84330) LONGITUDE: 75° 39.3' W ( -75.65500)
The bench mark is a disk set in the NNW end of the 0.6 m wide by 0.15 m high
(2.0 ft wide by 0.5 ft high) concrete foundation for the tall, blue, metal clad
boat shed's sliding door, on the east corner of the Spencer Marine property,
18.93 m (62.1 ft) WSW of the WSW edge of the travel-lift slip, 3.47 m (11.4 ft)
NNW of the north corner the boat shed, and 1.22 m (4.0 ft) east of the east end
of a 3.6 m (12.0 ft) long propane gas tank, and 0.15 m (0.5 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8652437 PUBLICATION DATE: 10/30/2003
Name: OYSTER CREEK, CROATAN SOUND
NC
NOAA Chart: 12205 Latitude: 35° 50.7' N ( 35.84500)
USGS Quad: WANCHESE Longitude: 75° 39.3' W ( -75.65500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: DAR 24 1995
DESIGNATION: DAR 24
MONUMENTATION: Survey disk VM#: 16753
AGENCY: North Carolina Geodetic Survey (NCGS) IDB PID#: AH9292
SETTING CLASSIFICATION: Concrete electrical pad OPUS PID:
LATITUDE: 35° 50.7' N ( 35.84500) LONGITUDE: 75° 39.3' W ( -75.65500)
The bench mark is a disk set in the SW corner of a 1.1 m wide by 1.3 m high (3.5
ft wide by 4.4 ft high) concrete pad that supports a green, electrical utility
box, on the SW side of Beverly Drive (SR 1183), 41.15 m (135.0 ft) NW of the
north corner of a blue, metal clad building on the Spencer Marine property,
19.01 m (62.4 ft) SW of service pole No. Q2106H144 with NC Geodetic Survey
reference tag, 9.14 m (30.0 ft) from the centerline of Beverly Drive, and 2.13 m
(7.0 ft) from the NW edge of the boat basin on the Spencer Marine property, 0.45
m (1.5 ft) higher than Beverly Drive and 0.45 m (1.5 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8652437 PUBLICATION DATE: 10/30/2003
Name: OYSTER CREEK, CROATAN SOUND
NC
NOAA Chart: 12205 Latitude: 35° 50.7' N ( 35.84500)
USGS Quad: WANCHESE Longitude: 75° 39.3' W ( -75.65500)
T I D A L D A T U M S
Tidal datums at OYSTER CREEK, CROATAN 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 = 0.183
MEAN HIGH WATER MHW = 0.157
MEAN TIDE LEVEL MTL = 0.094
MEAN SEA LEVEL MSL = 0.093
MEAN LOW WATER MLW = 0.031
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2437 A 2002 0.665 0.508
2437 B 2002 1.101 0.944
2437 C 2002 1.034 0.877
2437 D 2002 1.601 1.444
DAR 24 1995 1.330 1.173
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8652437 PUBLICATION DATE: 10/30/2003
Name: OYSTER CREEK, CROATAN SOUND
NC
NOAA Chart: 12205 Latitude: 35° 50.7' N ( 35.84500)
USGS Quad: WANCHESE Longitude: 75° 39.3' W ( -75.65500)
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.