U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 03/13/1989
Station ID: 8728853 SUPERCEDED DATE: 04/21/2003
Name: WHITE CITY, INTRACOASTAL WATERWAY
FLORIDA
NOAA Chart: 11393 Latitude: 29° 52.8' N
USGS Quad: WHITE CITY Longitude: 85° 13.4' W
To reach the tidal bench marks from the junction of U.S. Highway 98 and State
Highway 71 at Port St. Joe, proceed NE on State Highway 71 for 6.8 miles (10.9
km) to the F. Eglin Bayless Bridge over the Intracoastal Waterway. The bench
marks are located on the bridge and north of the bridge along State Highway 71.
The tide gage and staff were located on the NW wing wall of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8853 A 1977 CLB
MONUMENTATION: Survey Disk VM#: 9897
AGENCY: PID#: AS0915
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument, 124.3 feet (37.9 m) SE
of the centerline of the highway, 90.3 feet (27.5 m) NE of Bench Mark 6.785 U44
1934, 52 feet (16 m) NE of a 2-foot (1 m) diameter palm tree, 34.3 feet (10.5 m)
SE of the south corner of a white frame house, 1.2 feet (0.4 m) north of the
north corner of the fence around the U.S. Corps of Engineers facility, and 0.3
foot (0.1 m) above the ground.
BENCH MARK STAMPING: 6.785 U44 1934
MONUMENTATION: Survey Disk VM#: 9895
AGENCY: PID#: AS0034
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument, 420 feet (128 m) north
of the north end of the bridge, 71 feet (22 m) SW of the SE corner of a large
two story frame house, 62 feet (19 m) east of the centerline of the highway,
56.5 feet (17.2 m) west of a palm tree, and 3 feet (1 m) below the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 03/13/1989
Station ID: 8728853 SUPERCEDED DATE: 04/21/2003
Name: WHITE CITY, INTRACOASTAL WATERWAY
FLORIDA
NOAA Chart: 11393 Latitude: 29° 52.8' N
USGS Quad: WHITE CITY Longitude: 85° 13.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Y 294 1967
MONUMENTATION: Survey Disk VM#: 9896
AGENCY: PID#: AS0033
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set in the top of the west end of the south concrete abutment
of the bridge, 21 feet (6 m) west of the centerline of the highway, and 1 foot
(0.3 m) above the highway.
BENCH MARK STAMPING: 8853 B 1977 CLB
MONUMENTATION: Survey Disk VM#: 9898
AGENCY: PID#: AS0914
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 73 feet (22 m) NE of the NW wing wall of the bridge, 54 feet
(16 m) SW of the NW bridge barricade, 50.9 feet (15.5 m) west of the centerline
of the highway, 30 feet (9 m) NW of a utility pole with three transformers, and
1.5 feet (0.5 m) SW of a witness post. The bench mark is 15 feet (5 m) below
the highway, crimped to a copper-clad steel rod driven 48 feet (15 m) to
refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 8853 C 1977 CLB
MONUMENTATION: Survey Disk VM#: 9899
AGENCY: PID#: AS0916
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is at the intersection of State Highway 71 and Sealey Drive, 63.3
feet (19.3 m) WNW of the centerline of the highway, 20 feet (6 m) SSW of the
centerline of Sealey Drive, 6.3 feet (1.9 m) NE of a utility pole, and 1.6 feet
(0.5 m) NE of a witness post. The bench mark is 1.2 feet (0.4 m) below the
ground, crimped to a copper-clad steel rod driven 48 feet (15 m) to refusal, and
encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 03/13/1989
Station ID: 8728853 SUPERCEDED DATE: 04/21/2003
Name: WHITE CITY, INTRACOASTAL WATERWAY
FLORIDA
NOAA Chart: 11393 Latitude: 29° 52.8' N
USGS Quad: WHITE CITY Longitude: 85° 13.4' W
T I D A L D A T U M S
Tidal datums at WHITE CITY, INTRACOASTAL WATERWAY based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: DECEMBER 1977 - MAY 1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8728690 APALACHICOLA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/25/1978) = 2.35
MEAN HIGHER HIGH WATER MHHW = 1.03
MEAN HIGH WATER MHW = 0.95
MEAN TIDE LEVEL MTL = 0.52
MEAN LOW WATER MLW = 0.09
MEAN LOWER LOW WATER MLLW = 0.00
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = -0.31
LOWEST OBSERVED WATER LEVEL (12/10/1977) = -1.41
* NGVD is based on elevations published in Quad 290851, June 1973, and NOS
leveling of 1978.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
8853 A 1977 CLB 7.23 6.28
6.785 U44 1934 6.47 5.52
Y 294 1967 17.33 16.38
8853 B 1977 CLB 4.33 3.38
8853 C 1977 CLB 8.27 7.32
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 03/13/1989
Station ID: 8728853 SUPERCEDED DATE: 04/21/2003
Name: WHITE CITY, INTRACOASTAL WATERWAY
FLORIDA
NOAA Chart: 11393 Latitude: 29° 52.8' N
USGS Quad: WHITE CITY Longitude: 85° 13.4' 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.