U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8729015 PUBLICATION DATE: 07/14/2003
Name: ALLANTON, EAST BAY
FL
NOAA Chart: 11389 Latitude: 30° 1.8' N ( 30.03000)
USGS Quad: ALLANTON Longitude: 85° 27.9' W ( -85.46500)
To reach the tidal bench marks from the intersection of U.S. Highway 98 and
State Road 22 at Callaway, proceed east on State Road 22 for 9.2 km (5.7 mi) to
County Road 2297, turn right and go south on County Road 2297 for 15.0 km (9.3
mi) to the end of the paved road and Allanton Road on the left, turn left and go
east for 0.6 km (0.4 mi) to the end of pavement, continue on the dirt road for
1.2 km (0.8 mi) to the E.R. Allan driveway (No. 13926), turn right and go south
for 0.3 km (0.2 mi). The bench marks are located on C.D. King's and E.R.
Allan's properties. The tide gage and staff were located at the end of a wooden
dock on the Allan property.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1975
DESIGNATION: 872 9015 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 9942
AGENCY: National Ocean Survey (NOS) IDB PID#: BE1733
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 1.9' N ( 30.03170) LONGITUDE: 85° 27.9' W ( -85.46500)
The primary bench mark is a disk set 0.3 km (0.2 mile) south of C.D. King's
mailbox along the driveway to his residence, 32 m (105 ft) north of the
approximate shoreline, 23 m (75 ft) ESE of the SE corner of C.D. King's
residence, and 1.49 m (4.9 ft) east of a 0.67 m (2.2 ft) diameter pecan tree.
The bench mark is crimped to a copper-clad steel rod driven to an unspecified
depth.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8729015 PUBLICATION DATE: 07/14/2003
Name: ALLANTON, EAST BAY
FL
NOAA Chart: 11389 Latitude: 30° 1.8' N ( 30.03000)
USGS Quad: ALLANTON Longitude: 85° 27.9' W ( -85.46500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C D KING 1975
DESIGNATION: 872 9015 TIDAL C D KING
MONUMENTATION: Tidal Station disk VM#: 9943
AGENCY: National Ocean Survey (NOS) IDB PID#: BE1731
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 1.9' N ( 30.03170) LONGITUDE: 85° 27.9' W ( -85.46500)
The bench mark is a disk set 0.24 km (0.15 mile) south of C.D. King's mailbox
along the driveway to his residence, 53.9 m (177 ft) south of Bench Mark NO 4
1975, 4.54 m (14.9 ft) west of the centerline of C.D. King's driveway, 3 m (10
ft) east of a fence line, 2 m (7 ft) NE of a barn, and 0.49 m (1.6 ft) north of
a power pole. The bench mark is set level with the dirt driveway, crimped to a
copper-clad steel rod driven to an unspecified depth.
BENCH MARK STAMPING: NO 3 1975
DESIGNATION: 872 9015 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 9944
AGENCY: National Ocean Survey (NOS) IDB PID#: BE1732
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 1.9' N ( 30.03170) LONGITUDE: 85° 27.9' W ( -85.46500)
The bench mark is a disk set in the top of a concrete monument, 0.3 km (0.2
mile) south of C.D. King's mailbox along the driveway to his residence, 33 m
(108 ft) north of a sea wall, 16.31 m (53.5 ft) WNW of the NW corner of the C.D.
King residence, 16 m (52 ft) ESE of power pole #4, and 0.3 m (1 ft) below the
level of the driveway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8729015 PUBLICATION DATE: 07/14/2003
Name: ALLANTON, EAST BAY
FL
NOAA Chart: 11389 Latitude: 30° 1.8' N ( 30.03000)
USGS Quad: ALLANTON Longitude: 85° 27.9' W ( -85.46500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 5 1975
DESIGNATION: 872 9015 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 9945
AGENCY: National Ocean Survey (NOS) IDB PID#: BE1729
SETTING CLASSIFICATION: Concrete monument OPUS PID#: BE1729
LATITUDE: 30° 2.0' N ( 30.03330) LONGITUDE: 85° 27.9' W ( -85.46500)
The bench mark is a disk set in the top of a concrete monument, 0.08 km (0.05
mile) south of C.D. King's mailbox along the driveway to his residence, 6.86 m
(22.5 ft) west of the centerline of the driveway, 4.42 m (14.5 ft) NE of a fence
corner post, 0.3 m (1 ft) north of a power pole, and about level with the
driveway.
BENCH MARK STAMPING: 9015 A 1988
DESIGNATION: 872 9015 A
MONUMENTATION: Tidal Station disk VM#: 9946
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 1.9' N ( 30.03170) LONGITUDE: 85° 28.0' W ( -85.46670)
The bench mark is a disk set in a concrete monument on E.R. Allan's property
(residence just west of C.D. King's), 137 m (450 ft) south of a graded dirt
road, 91 m (300 ft) east of the E.R. Allan Residence, and 69 m (225 ft) north of
the approximate shoreline.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8729015 PUBLICATION DATE: 07/14/2003
Name: ALLANTON, EAST BAY
FL
NOAA Chart: 11389 Latitude: 30° 1.8' N ( 30.03000)
USGS Quad: ALLANTON Longitude: 85° 27.9' W ( -85.46500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1975
DESIGNATION: 872 9015 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 12509
AGENCY: National Ocean Survey (NOS) IDB PID#: BE1730
SETTING CLASSIFICATION: Concrete monument OPUS PID#: BE1730
LATITUDE: 30° 2.0' N ( 30.03330) LONGITUDE: 85° 27.9' W ( -85.46500)
The bench mark is a disk set 0.16 km (0.10 mile) south of C.D. King's mailbox
along the driveway to his residence, 61 m (200 ft) south of bench mark NO 5
1975, 2.41 m (7.9 ft) east of a fence line, and 0.3 m (1 ft) west of a power
pole.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8729015 PUBLICATION DATE: 07/14/2003
Name: ALLANTON, EAST BAY
FL
NOAA Chart: 11389 Latitude: 30° 1.8' N ( 30.03000)
USGS Quad: ALLANTON Longitude: 85° 27.9' W ( -85.46500)
T I D A L D A T U M S
Tidal datums at ALLANTON, EAST BAY based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: February 1976 - January 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8729840 PENSACOLA, PENSACOLA BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (05/15/1976) = 0.805
MEAN HIGHER HIGH WATER MHHW = 0.466
MEAN HIGH WATER MHW = 0.431
MEAN TIDE LEVEL MTL = 0.232
MEAN SEA LEVEL MSL = 0.231
North American Vertical Datum NAVD88 = 0.192
MEAN LOW WATER MLW = 0.033
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/19/1977) = -0.567
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1975 0.968 0.537
C D KING 1975 1.380 0.949
NO 3 1975 1.106 0.675
NO 5 1975 1.809 1.378
9015 A 1988 1.404 0.973
NO 4 1975 0.878 0.447
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8729015 PUBLICATION DATE: 07/14/2003
Name: ALLANTON, EAST BAY
FL
NOAA Chart: 11389 Latitude: 30° 1.8' N ( 30.03000)
USGS Quad: ALLANTON Longitude: 85° 27.9' W ( -85.46500)
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.