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Datums Page Page 1 of 5
Station ID: 8656590 PUBLICATION DATE: 08/03/2004
Name: ATLANTIC BEACH TRIPLE S PIER
NC
NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330)
USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170)
To reach the tidal bench marks from the Atlantic Beach Post Office, proceed
south on Morehead Avenue for 0.5 km (0.3 mi) to Fort Macon Boulevard, then turn
left and proceed east on Fort Macon Boulevard for 2.6 km (1.6 mi) to Henderson
Boulevard, then turn right and proceed south on Henderson Boulevard for 0.3 km
(0.2 mi) to Triple S Fishing Pier. The bench marks are near the pier and along
Henderson Boulevard. The tide gage was located near the outer end of the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6590 B 1976
DESIGNATION: 865 6590 TIDAL B
MONUMENTATION: Tidal Station disk VM#: 3564
AGENCY: National Ocean Survey (NOS) IDB PID#: AC7539
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 34° 41.8' N ( 34.69670) LONGITUDE: 76° 42.7' W ( -76.71170)
The primary bench mark is a disk located at the SW corner of Henderson Boulevard
and Cooper Avenue, 10.36 m (34.0 ft) west of the centerline of Henderson
Boulevard, 8 m (26 ft) south of the centerline of Cooper Avenue, 3.77 m (12.4
ft) east of the NE corner of the Sand and Sea Motel, and 0.43 m (1.4 ft) north
of a wooden street marker. The bench mark is crimped to the top of a
copper-clad steel rod driven an unspecified depth, and surrounded by a 4-inch
PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8656590 PUBLICATION DATE: 08/03/2004
Name: ATLANTIC BEACH TRIPLE S PIER
NC
NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330)
USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1960
DESIGNATION: 865 6590 TIDAL 4
MONUMENTATION: Bench Mark disk VM#: 3561
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EA0180
SETTING CLASSIFICATION: Concrete apron OPUS PID:
LATITUDE: 34° 41.7' N ( 34.69500) LONGITUDE: 76° 42.7' W ( -76.71170)
The bench mark is a disk set in the concrete apron surrounding the Triple S Pier
snack bar building, 10.21 m (33.5 ft) west of the extended centerline of
Henderson Boulevard, 9.45 m (31.0 ft) east of the NW corner of the attached
garage, and 0.12 m (0.4 ft) north of the building.
BENCH MARK STAMPING: NO 6 1960
DESIGNATION: 865 6590 TIDAL 6
MONUMENTATION: Bench Mark disk VM#: 3563
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: EA0177
SETTING CLASSIFICATION: Apartment building OPUS PID:
LATITUDE: 34° 41.9' N ( 34.69830) LONGITUDE: 76° 42.7' W ( -76.71170)
The bench mark is a disk set in a concrete slab beneath the Old Salt II Motel, a
second story overhang on the east side of Henderson Boulevard, 0.24 km (0.15 mi)
north of Triple S Pier, 34 m (113 ft) south of the centerline of Winston Avenue,
and 14 m (46 ft) east of the centerline of Henderson Boulevard.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8656590 PUBLICATION DATE: 08/03/2004
Name: ATLANTIC BEACH TRIPLE S PIER
NC
NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330)
USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6590 C 1976
DESIGNATION: 865 6590 TIDAL C
MONUMENTATION: Tidal Station disk VM#: 3565
AGENCY: National Ocean Survey (NOS) IDB PID#: AC7488
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: AC7488
LATITUDE: 34° 41.9' N ( 34.69830) LONGITUDE: 76° 42.7' W ( -76.71170)
The bench mark is a disk located on the west side of Henderson Boulevard at the
corner of Barefoot Lane, 9.91 m (32.5 ft) west of the centerline of Henderson
Boulevard, 7.44 m (24.4 ft) south of Barefoot Lane, 1.15 m (3.8 ft) NNE of a
fire hydrant, and 1.3 feet (0.4 m) east of a wooden street marker. The bench
mark is crimped to a copper-clad steel rod driven 13.7 m (45 ft), and surrounded
by a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: NO 8 1972
DESIGNATION: 865 6590 NO 8
MONUMENTATION: Tidal Station disk VM#: 14002
AGENCY: National Ocean Service (NOS) IDB PID#: AC7541
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 34° 41.9' N ( 34.69830) LONGITUDE: 76° 42.7' W ( -76.71170)
The bench mark is a disk set flush in the SE corner of the concrete foundation
of the concrete block bathhouse of the Triple S Marina camp ground, 37.77 m
(123.9 ft) north of the centerline of Fort Macon Boulevard, 9.46 m (31.0 ft)
east of the SW corner of the bathhouse, and 0.62 m (2.0 ft) SE of the SE corner
of the building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8656590 PUBLICATION DATE: 08/03/2004
Name: ATLANTIC BEACH TRIPLE S PIER
NC
NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330)
USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170)
T I D A L D A T U M S
Tidal datums at ATLANTIC BEACH TRIPLE S PIER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: June 1999 - May 2000
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:
HIGHEST OBSERVED WATER LEVEL (11/13/1981) = 1.982
MEAN HIGHER HIGH WATER MHHW = 1.264
MEAN HIGH WATER MHW = 1.160
North American Vertical Datum NAVD88 = 0.757
MEAN SEA LEVEL MSL = 0.610
MEAN TIDE LEVEL MTL = 0.604
MEAN LOW WATER MLW = 0.047
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/14/1982) = -0.746
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6590 B 1976 3.573 2.413
NO 4 1960 4.057 2.897
NO 6 1960 4.686 3.526
6590 C 1976 4.008 2.848
NO 8 1972 2.137 0.977
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8656590 PUBLICATION DATE: 08/03/2004
Name: ATLANTIC BEACH TRIPLE S PIER
NC
NOAA Chart: 11547 Latitude: 34° 41.6' N ( 34.69330)
USGS Quad: BEAUFORT Longitude: 76° 42.7' W ( -76.71170)
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.
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Station Location
Published bench mark
Unpublished bench mark