U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8679511 PUBLICATION DATE: 02/05/2004
Name: KINGS BAY
GA
NOAA Chart: 11503 Latitude: 30° 47.8' N ( 30.79670)
USGS Quad: HARRIETTS BLUFF Longitude: 81° 30.9' W ( -81.51500)
To reach the tidal bench marks from the exit for State Highway 40 off of
Interstate Highway 95, proceed SE on State Highway 40 for about 5 km (3 mi) to
Kings Bay Road (State Highway 40 Spur), then turn left and proceed north for
about 5 km (3 mi) to the entrance gate (Stimson Gate) to the Naval Submarine
Base, then go straight ahead on USS Henry L. Stimson Drive to its end at Port
Services T-pier. The bench marks are on T-pier, the wharves on each side of
T-pier and along USS Henry L. Stimson Drive. The tide gage and staff were on
the north inside corner of T-pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9511 G 1989
DESIGNATION: 867 9511 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 4945
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 48.1' N ( 30.80170) LONGITUDE: 81° 30.9' W ( -81.51500)
The primary bench mark is a disk located at the intersection of USS Henry L.
Stimson Drive and USS James Monroe Avenue, 38.47 m (126.2 ft) NE of the
centerline of USS James Monroe Avenue, 33.56 m (110.1 ft) west of the west
corner of a 7.01 m x 7.32 m (23.0 ft x 24.0 ft) concrete fuel pad, 11.95 m (39.2
ft) SE of the centerline of USS Henry L. Stimson Drive, and 6.49 m (21.3 ft) SSW
of the south post of the Port Services sign. The bench mark is crimped to the
top of a stainless steel rod driven 12.2 m (40 ft) to refusal, and encased in a
5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8679511 PUBLICATION DATE: 02/05/2004
Name: KINGS BAY
GA
NOAA Chart: 11503 Latitude: 30° 47.8' N ( 30.79670)
USGS Quad: HARRIETTS BLUFF Longitude: 81° 30.9' W ( -81.51500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: EHW1 BB 1988
DESIGNATION: 867 9511 EHW1 BB
MONUMENTATION: Gravity Station disk VM#: 4941
AGENCY: Defense Mapping Agency (DMA) IDB PID#:
SETTING CLASSIFICATION: Bull rail OPUS PID:
LATITUDE: 30° 48.1' N ( 30.80170) LONGITUDE: 81° 30.9' W ( -81.51500)
The bench mark is a disk set in the top of a bull rail on the west side of the
submarine basin at Explosive Handling Wharf NO. 1 east of T-pier, 16.40 m (53.8
ft) ENE of the north corner of door NO. 6, 11.98 m (39.3 ft) NNW of the fourth
bollard from the south entrance to Explosive Handling Wharf NO. 1, 3.69 m (12.1
ft) south of the south edge of the north brow, and 0.82 m (2.7 ft) south of the
compressed air compartment.
BENCH MARK STAMPING: MONROE ASTRO 1988
DESIGNATION: 867 9511 MONROE ASTRO
MONUMENTATION: Survey disk VM#: 4942
AGENCY: Defense Mapping Agency (DMA) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 48.1' N ( 30.80170) LONGITUDE: 81° 30.9' W ( -81.51500)
The bench mark is a disk set in a concrete monument on the west side of the dirt
road leading north from the Port Nerrias parking lot, 123 m (404 ft) SSE of the
SW inshore corner of the concrete wharf on the north side of Trident Refit
Wharf, 31.24 m (102.5 ft) ENE of a 0.3 m (1 ft) diameter pine tree on the west
side of the dirt road, and about 10 m (34 ft) SW of the approximate high water
line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8679511 PUBLICATION DATE: 02/05/2004
Name: KINGS BAY
GA
NOAA Chart: 11503 Latitude: 30° 47.8' N ( 30.79670)
USGS Quad: HARRIETTS BLUFF Longitude: 81° 30.9' W ( -81.51500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TRF1 BB 1988
DESIGNATION: 867 9511 TRF1 BB
MONUMENTATION: Gravity Station disk VM#: 4943
AGENCY: Defense Mapping Agency (DMA) IDB PID#:
SETTING CLASSIFICATION: Bull Rail OPUS PID:
LATITUDE: 30° 48.1' N ( 30.80170) LONGITUDE: 81° 30.9' W ( -81.51500)
The bench mark is a disk set in the top of the SE-NW bull rail at Trident Refit
Wharf west of T-pier, 49 m (160 ft) north of the SE corner of the wharf
building, 31.24 m (102.5 ft) east of the NE corner of the wharf building, 6.34 m
(20.8 ft) SE of the tenth cleat of the north end of the bull rail, 5.79 m (19.0
ft) NW of the eleventh cleat of the north end of the bull rail, and about 0.70 m
(2.3 ft) NW of a permanent concrete crossover to the bull rail.
BENCH MARK STAMPING: 9511 F 1989
DESIGNATION: 867 9511 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 4944
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pier OPUS PID#: BBBW69
LATITUDE: 30° 48.1' N ( 30.80170) LONGITUDE: 81° 30.9' W ( -81.51500)
The bench mark is a disk set flush on the north side of T-pier, 30.21 m (99.1
ft) NE of a fire hydrant on the same side of the pier, 4.27 m (14.0 ft) NW of
the centerline of the pier, 1.04 m (3.4 ft) SE of the north edge of the pier,
and about 0.3 m (1 ft) above the pier deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8679511 PUBLICATION DATE: 02/05/2004
Name: KINGS BAY
GA
NOAA Chart: 11503 Latitude: 30° 47.8' N ( 30.79670)
USGS Quad: HARRIETTS BLUFF Longitude: 81° 30.9' W ( -81.51500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9511 H 1989
DESIGNATION: 867 9511 H TIDAL
MONUMENTATION: Tidal Station disk VM#: 4946
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 48.1' N ( 30.80170) LONGITUDE: 81° 30.9' W ( -81.51500)
The bench mark is a disk located along USS Henry L. Stimson Drive, 52.67 m
(172.8 ft) SW of the fifth light pole west of the intersection of USS James
Monroe Avenue and USS Henry L. Stimson Drive, 39.65 m (130.1 ft) south of the
centerline of USS Henry L. Stimson Drive, and 2.65 m (8.7 ft) north of a witness
post. The bench mark is crimped to the top of a stainless steel rod driven 7.3
m (24 ft) to refusal, and encased in a 5-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 9511 J 1989
DESIGNATION: 867 9511 J TIDAL
MONUMENTATION: Tidal Station disk VM#: 4947
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 48.1' N ( 30.80170) LONGITUDE: 81° 30.9' W ( -81.51500)
The bench mark is a disk located along USS Henry L. Stimson Drive, 47.85 m
(157.0 ft) SW of the fifth light pole east of the intersection of USS Henry L.
Stimson Drive and USS Kamehameha Avenue, 39.96 m (132.1 ft) south of the
centerline of USS Henry L. Stimson Drive, and 2.50 m (8.2 ft) north of the tree
line. The bench mark is crimped to the top of a stainless steel rod driven 15.8
m (52 ft) to refusal, and encased in a 5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8679511 PUBLICATION DATE: 02/05/2004
Name: KINGS BAY
GA
NOAA Chart: 11503 Latitude: 30° 47.8' N ( 30.79670)
USGS Quad: HARRIETTS BLUFF Longitude: 81° 30.9' W ( -81.51500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9511 K 1989
DESIGNATION: 867 9511 K TIDAL
MONUMENTATION: Tidal Station disk VM#: 4948
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 48.1' N ( 30.80170) LONGITUDE: 81° 30.9' W ( -81.51500)
The bench mark is a disk located along USS Henry L. Stimson Drive, 16.18 m (53.1
ft) north of the centerline of the road leading to the fire station, 16.15 m
(53.0 ft) west of the centerline of USS Kamehameha Avenue, and 10.33 m (33.9 ft)
south of USS Henry L. Stimson Drive. The bench mark is crimped to the top of a
stainless steel rod driven 4.9 m (16 ft) to refusal, and encased in a 5-inch PVC
pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8679511 PUBLICATION DATE: 02/05/2004
Name: KINGS BAY
GA
NOAA Chart: 11503 Latitude: 30° 47.8' N ( 30.79670)
USGS Quad: HARRIETTS BLUFF Longitude: 81° 30.9' W ( -81.51500)
T I D A L D A T U M S
Tidal datums at KINGS BAY based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: January 1990 - December 1990
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8720030 FERNANDINA BEACH, AMELIA RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (05/24/1990) = 2.696
MEAN HIGHER HIGH WATER MHHW = 2.134
MEAN HIGH WATER MHW = 2.023
MEAN SEA LEVEL MSL = 1.084
MEAN TIDE LEVEL MTL = 1.043
MEAN LOW WATER MLW = 0.062
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/24/1990) = -0.757
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9511 G 1989 4.131 2.108
EHW1 BB 1988 5.520 3.497
MONROE ASTRO 1988 5.288 3.265
TRF1 BB 1988 5.533 3.510
9511 F 1989 5.051 3.028
9511 H 1989 3.955 1.932
9511 J 1989 3.455 1.432
9511 K 1989 4.595 2.572
Foot Notes:
Bench marks EHW1 BB 1988, MONROE ASTRO 1988 and TRF1 BB 1988 are based on one
differential leveling connection and do not meet the quality control standards
of the NOS. Therefore, caution should be used when deriving elevations for
these marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8679511 PUBLICATION DATE: 02/05/2004
Name: KINGS BAY
GA
NOAA Chart: 11503 Latitude: 30° 47.8' N ( 30.79670)
USGS Quad: HARRIETTS BLUFF Longitude: 81° 30.9' W ( -81.51500)
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.