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Datums Page Page 1 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
To reach the tidal bench marks from Moorehead City, from the U.S. Highway 70
bridge over Beaufort Channel west of Beaufort, proceed west on U.S. Highway 70
for 0.3 km (0.2 mi) to the road leading to Pivers Island, turn left and go 0.6
km (0.4 mi) to Duke Marine Laboratories. The bench marks are along the road
leading to the laboratories and on the grounds. The gauges are at the Duke
Marine Lab dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 11 1964
DESIGNATION: 865 6483 NO 11
MONUMENTATION: Tidal Station disk VM#: 547
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AI9505
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 34° 43.2' N ( 34.72000) LONGITUDE: 76° 40.2' W ( -76.67000)
The primary bench mark is a disk set flush in the SE corner of the SE concrete
base of a flag and wind gage tower on the National Marine Fisheries Service
(NMFS) grounds, 18.59 m (61.0 ft) SE of the SE corner of a maintenance shop,
5.21 m (17.1 ft) east of the SE corner of a concrete tank, 2.01 m (6.6 ft) north
of the NW corner of the NMFS Seawater Lab, and 0.30 m (1 ft) SE of the SE metal
leg of the tower.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 10 1964
DESIGNATION: 865 6483 NO 10
MONUMENTATION: Tidal Station disk VM#: 546
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AI9506
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 34° 43.2' N ( 34.72000) LONGITUDE: 76° 40.2' W ( -76.67000)
The bench mark is a disk set in the top of the sea wall at the National Marine
Fisheries Service on Pivers Island, 23.77 m (78.0 ft) NE of the center of a flag
tower, 13.26 m (43.5 ft) SE of the south corner of a pier, and 10.00 m (32.8 ft)
east of utility pole No. 8146.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: X 112 1963
DESIGNATION: X 112
MONUMENTATION: Bench Mark disk VM#: 549
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EA0107
SETTING CLASSIFICATION: Concrete wing wall OPUS PID:
LATITUDE: 34° 43.1' N ( 34.71831) LONGITUDE: 76° 40.1' W ( -76.66831)
The bench mark is a disk set in the SW concrete wingwall at the SW corner of the
U.S. Highway 70 bridge over Beaufort Channel, 25.30 m (83.0 ft) north of the
north rail of the Beaufort and Morehead Railroad, 6.55 m (21.5 ft) south of the
centerline of the highway, 0.70 m (2.3 ft) south of the south face of the guard
rail, and 0.30 m (1.0 ft) above the road.
BENCH MARK STAMPING: 6483 A 1996
DESIGNATION: 865 6483 A
MONUMENTATION: Tidal Station disk VM#: 13740
AGENCY: National Ocean Service (NOS) IDB PID#: DJ9297
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 34° 43.0' N ( 34.71669) LONGITUDE: 76° 40.3' W ( -76.67169)
The bench mark is a disk set in a rock outcrop with a brass plaque with the
inscription Duke University Marine Laboratory, at the dormitories and dining
hall at Duke Marine Labs, 20.03 m (65.7 ft) north of the NW corner of the
administration office, 17.68 m (58.0 ft) east of the east face of the Dining
Hall Building, and 5.18 m (17.0 ft) west of the center of another rock outcrop.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6483 B 1996
DESIGNATION: 865 6483 B
MONUMENTATION: Tidal Station disk VM#: 13741
AGENCY: National Ocean Service (NOS) IDB PID#: DJ9294
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 34° 43.1' N ( 34.71831) LONGITUDE: 76° 40.4' W ( -76.67331)
The bench mark is a disk located in a grassy area west of the administration
building on the property of the National Marine Fisheries Service (NMFS), 32.16
m (105.5 ft) east of the centerline of the Pivers Island Road, 24.78 m (81.3 ft)
south of the south edge of the drive leading to the administration building,
20.67 m (67.8 ft) west of the SE corner of the administration building, 17.79 m
(58.4 ft) NE of a red fire hydrant, and 6.63 m (21.8 ft) west of a witness post
nailed to a yeopon tree. The bench mark is 9 cm (0.3 ft) below ground, crimped
to the top of a stainless steel rod driven 14.6 m (48 ft) to refusal, and
encased in a 5-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 6483 E 1998
DESIGNATION: 865 6483 E TIDAL
MONUMENTATION: Flange-encased Rod VM#: 13975
AGENCY: National Ocean Service (NOS) IDB PID#: DE7961
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: DE7961
LATITUDE: 34° 43.4' N ( 34.72331) LONGITUDE: 76° 40.4' W ( -76.67331)
The bench mark is a flange-encased rod located along US Highway 70 near the
entrance road to Pivers Island and Duke Marine Lab, 22.00 m (72.2 ft) east of
the centerline of the entrance road, 19.10 m (62.7 ft) south of the south edge
of US Highway 70, and 6.85 m (22.5 ft) north of the north rail of the old train
tracks. The datum point is set 9 cm (0.3 ft) below ground, being the top of a
stainless steel rod driven 21.3 m (70 ft) to refusal, and encased in a 5-inch
NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6483 F 1999
DESIGNATION: 865 6483 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 15891
AGENCY: National Ocean Service (NOS) IDB PID#: DJ9295
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 34° 43.1' N ( 34.71831) LONGITUDE: 76° 40.2' W ( -76.67000)
The bench mark is a disk set flush in the top of a concrete and sheetpile
bulkhead located on the east side of the laboratory property, 24 m (79 ft) west
of the east face of the concrete bulkhead, 21.71 m (71.2 ft) NE of the NE corner
of the cedar shack building, 6.00 m (19.7 ft) ESE of the SE corner of the
maintenance building, 0.69 m (2.3 ft) south of the south face of the concrete
pier, and 0.23 m (0.75 ft) east of the west face of the concrete bulkhead.
BENCH MARK STAMPING: 6483 G 1999
DESIGNATION: 865 6483 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 15892
AGENCY: National Ocean Service (NOS) IDB PID#: DJ9296
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID#: DJ9296
LATITUDE: 34° 43.0' N ( 34.71669) LONGITUDE: 76° 40.3' W ( -76.67169)
The bench mark is a disk set flush in the top of a concrete and sheetpile
bulkhead, 32.42 m (106.4 ft) south of the northernmost end of bulkhead, 31.00 m
(101.7 ft) NE of the SE corner of the Cartography Office, 29.54 m (96.9 ft) SE
of Dorm No.1, 11.93 m (39.1 ft) north of the angle in the bulkhead, 0.45 m (1.5
ft) west of the east face of the bulkhead, and 0.26 m (0.85 ft) east of the west
face of the concrete bulkhead.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6483 J 2009
DESIGNATION: 865 6483 J
MONUMENTATION: Tidal Station disk VM#: 19576
AGENCY: National Ocean Survey/Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete wing wall OPUS PID:
LATITUDE: 34° 43.2' N ( 34.71986) LONGITUDE: 76° 40.5' W ( -76.67561)
The bench mark is set flush in the SW wing wall of the Pivers Island bridge,
15.2 m (49.9 ft) west of a power pole number NOK44, 5.85 m (19.19 ft) east of
the centerline of Pivers Island road, 1.57 m (5.15 ft) south of the south end of
the wing wall, and 0.91 m (2.99 ft) above the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: NCCOS BEAUFORT
MONUMENTATION: Tidal Station disk VM#: 20547
AGENCY: NOAA IDB PID#: DG9239
SETTING CLASSIFICATION: Granite monument OPUS PID:
LATITUDE: 34° 43.1' N ( 34.71870) LONGITUDE: 76° 40.3' W ( -76.67130)
The bench mark is located 27.7 m (91.0 ft) east-southeast of a single phase
utility pole marked NKC63, 20.7 m (67.8 ft) south-southeast of the easternmost
of two yellow plastic bollards protecting a water meter, 16.2 m (53.3 ft) east
northeast of a fire hydrant, and 12.3 m (40.4 ft) east of the center of gravel
road. The bench marks is a 0.65 ft diameter NOAA commemorative disk set in a 3ft
X 3ft X 1ft granite monument on a 5.6 ft x 3.4 ft base and is set 2 feet deep
and anchored with rebar.
BENCH MARK STAMPING: 6483 K 2018
DESIGNATION: 865 6483 K
MONUMENTATION: Survey disk VM#: 22583
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 34° 43.1' N ( 34.71844) LONGITUDE: 76° 40.4' W ( -76.67314)
The bench mark is a disk 46.5 m (152.5 ft) SSW of the NOAA Beaufort Laboratory
sign on the side of the road as you drive on to island, 35.5 m (116.6 ft) WNW of
a red firehydrant, and 1.2 m (3.95 ft ) WSW of the NE edge (water's edge) of
concrete seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
T I D A L D A T U M S
Tidal datums at BEAUFORT, DUKE MARINE LAB based on:
LENGTH OF SERIES: 19 YEARS
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/14/2018) = 2.183
MEAN HIGHER HIGH WATER MHHW = 1.078
MEAN HIGH WATER MHW = 0.991
North American Vertical Datum NAVD88 = 0.633
MEAN SEA LEVEL MSL = 0.521
MEAN TIDE LEVEL MTL = 0.517
MEAN LOW WATER MLW = 0.043
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (03/08/2004) = -0.751
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 11 1964 2.535 1.544
NO 10 1964 1.564 0.573
X 112 1963 5.161 4.170
6483 A 1996 2.758 1.767
6483 B 1996 2.038 1.047
6483 E 1998 1.782 0.791
6483 F 1999 2.135 1.144
6483 G 1999 2.134 1.143
6483 J 2009 3.215 2.224
NCCOS BEAUFORT 2.864 1.873
6483 K 2018 2.101 1.110
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
Foot Notes:
Bench mark 6483 K 2018 is based on one differential leveling connection and does
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 10
Station ID: 8656483 PUBLICATION DATE: 08/22/2019
Name: BEAUFORT, DUKE MARINE LAB
NC
NOAA Chart: 11547 Latitude: 34° 43.2' N ( 34.72000)
USGS Quad: BEAUFORT Longitude: 76° 40.2' W ( -76.67000)
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.