U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 01/25/1988
Station ID: 8720215 SUPERCEDED DATE: 04/21/2003
Name: JACKSONVILLE NAVY FUEL DEPOT, ST. JOHNS RIVER
FLORIDA
NOAA Chart: 11491 Latitude: 30° 24.0' N
USGS Quad: ARLINGTON Longitude: 81° 37.6' W
To reach the tidal bench marks from the intersection of U.S. Highway 17 (Main
Street) and Heckscher Drive, proceed 0.67 miles (1.1 km) east on Heckscher Drive
to the paved drive leading south into the Navy Fuel Depot, follow the driveway
to the large concrete fuel loading pier which is on the north shore of St. Johns
River. The tide gage and staff were located on a platform in the St. Johns
River.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 3 1958
MONUMENTATION: Survey Disk VM#: 5095
AGENCY: PID#: BC0275
SETTING CLASSIFICATION: Concrete Base of Building
The bench mark is set on the top of the west end of the concrete base of the
foundation of Building 92, 48 feet (15 m) north of the center of a large steel
gate for the entrance to Pier 2, 20 feet (6 m) north of the centerline of a
black-topped street, and 0.9 foot (0.3 m) SE of the SW corner of Building 92.
BENCH MARK STAMPING: BM OIL 3 1945
MONUMENTATION: Survey Disk VM#: 5093
AGENCY: PID#: BC0272
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set on the top of a concrete monument 150 feet (46 m) NE of
the north end of Pier 1, 42 feet (13 m) south of the centerline of the street,
16.6 feet (5.1 m) north of the SW corner of Building 30, and 1.9 feet (0.6 m)
west of the west face of Building 30.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 01/25/1988
Station ID: 8720215 SUPERCEDED DATE: 04/21/2003
Name: JACKSONVILLE NAVY FUEL DEPOT, ST. JOHNS RIVER
FLORIDA
NOAA Chart: 11491 Latitude: 30° 24.0' N
USGS Quad: ARLINGTON Longitude: 81° 37.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1958
MONUMENTATION: Survey Disk VM#: 5094
AGENCY: PID#: BC0274
SETTING CLASSIFICATION: Concrete Wall
The bench mark is set on the top of the east end of the north concrete lead
wall, 165 feet (50 m) NE of the north end of Pier 1, 73 feet (22 m) north of and
directly across the street from Bench Mark OIL 3 1945, 24 feet (7 m) north of
the centerline of an east-west street, and 23 feet (7 m) east of the centerline
of the street leading north, opposite Building 30.
BENCH MARK STAMPING: 0215 D 1977
MONUMENTATION: Survey Disk VM#: 5096
AGENCY: PID#: BC1557
SETTING CLASSIFICATION: Concrete Slab
The bench mark is set in a concrete slab supporting the Guard House, 47 feet (14
m) NW of the front door of the Administration Building, 23.5 feet (7.1 m) east
of the SW corner of the entrance gate, and 13.9 feet (4.2 m) south of the
centerline of Sommers Road.
BENCH MARK STAMPING: B 325 1970
MONUMENTATION: Survey Disk VM#: 5097
AGENCY: PID#: BC0265
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument near the NW corner of a
high steel fence around a power sub-station at the junction of Sommers Road
leading south, 108.8 feet (33.2 m) west of the west rail of a spur track, 56
feet (17 m) east of the centerline of Sommers Road, 1.9 feet (0.6 m) east of the
NW corner fence post, and 1 foot (0.3 m) north of the fence line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 01/25/1988
Station ID: 8720215 SUPERCEDED DATE: 04/21/2003
Name: JACKSONVILLE NAVY FUEL DEPOT, ST. JOHNS RIVER
FLORIDA
NOAA Chart: 11491 Latitude: 30° 24.0' N
USGS Quad: ARLINGTON Longitude: 81° 37.6' W
T I D A L D A T U M S
Tidal datums at JACKSONVILLE NAVY FUEL DEPOT, ST. JOHNS RIVER based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: SEPTEMBER-DECEMBER 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8720220 MAYPORT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (11/02/1977) = 3.77
MEAN HIGHER HIGH WATER MHHW = 2.83
MEAN HIGH WATER MHW = 2.71
MEAN TIDE LEVEL MTL = 1.40
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.84
MEAN LOW WATER MLW = 0.08
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (01/09/1978) = -1.01
* NGVD reference based on elevations published in Quad 300813, 1973, and NOS
leveling of 1978.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 3 1958 6.69 3.98
BM OIL 3 1945 6.08 3.37
NO 2 1958 6.04 3.33
0215 D 1977 8.56 5.85
B 325 1970 7.29 4.58
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 01/25/1988
Station ID: 8720215 SUPERCEDED DATE: 04/21/2003
Name: JACKSONVILLE NAVY FUEL DEPOT, ST. JOHNS RIVER
FLORIDA
NOAA Chart: 11491 Latitude: 30° 24.0' N
USGS Quad: ARLINGTON Longitude: 81° 37.6' W
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 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.