U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 07/05/1984
Station ID: 8729039 SUPERCEDED DATE: 04/21/2003
Name: PARKER BRANCH, LAIRD BAYOU, EAST BAY
FLORIDA
NOAA Chart: 11389 Latitude: 30° 8.2' N
USGS Quad: SPRINGFIELD Longitude: 85° 31.0' W
To reach the tidal bench marks from the intersection of Florida Highway 22 and
U.S. Highway 98, proceed 5.5 miles (8.8 km) east on Florida Highway 22 to its
intersection with Florida Highway 167, on Highway 167 proceed south 1.1 miles
(1.8 km) to a dirt drive leading west, on the dirt road continue to the wooden
bridge over Parker Branch. The bench marks are located along the dirt road over
Parker Branch, and the tide gage and staff were located on the SW corner of the
wooden bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9039 A 1976
MONUMENTATION: Survey Disk VM#: 9950
AGENCY: PID#: BE1719
SETTING CLASSIFICATION: Copper-Coated Rod
The bench mark is lcoated 400 feet (122 m) west of Bench mark 9039 B 1976, 135
feet (41 m) NNW of the SW corner of the wooden bridge over Parker Branch, 32
feet (10 m) north of the centerline of the dirt road, and 3 feet (0.9 m) north
of a power pole with a witness post. The bench mark is 0.3 feet (0.09 m) below
ground level, crimped to a copper-coated rod driven 40 feet (12 m) to refusal
and encased in PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 9039 B 1976
MONUMENTATION: Survey Disk VM#: 9951
AGENCY: PID#: BE1718
SETTING CLASSIFICATION: Copper-Coated Rod
The bench mark is located 449 feet (137 m) WNW of Bench Mark 9039 C 1976, 400
feet (122 m) east of Bench Mark 9039 A 1976, 43 feet (13 m) north of the
centerline of the dirt road and 6.3 feet (1.9 m) NE of a power pole with a
witness sign. The bench mark is 0.54 feet (0.2 m) below ground level, crimped
to a copper-coated rod driven 40 feet (12 m) to refusal and encased in PVC pipe
and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 07/05/1984
Station ID: 8729039 SUPERCEDED DATE: 04/21/2003
Name: PARKER BRANCH, LAIRD BAYOU, EAST BAY
FLORIDA
NOAA Chart: 11389 Latitude: 30° 8.2' N
USGS Quad: SPRINGFIELD Longitude: 85° 31.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9039 C 1976
MONUMENTATION: Survey Disk VM#: 9952
AGENCY: PID#: BE1717
SETTING CLASSIFICATION: Copper Coated Rod
The bench mark is located 449 feet (137 m) ESE of Bench Mark 9039 B 1976, 228
feet (69 m) WSW of Bench Mark 9039 D 1976, 45.6 feet (13.9 m) south of the
centerline of the dirt drive and 3 feet (1 m) SW of a power pole with a witness
sign. The bench mark is 0.8 feet (0.2 m) below ground level, crimped to a
copper-coated rod driven 33 feet(10 m) to refusal and encased in PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 9039 D 1976
MONUMENTATION: Survey Disk VM#: 9953
AGENCY: PID#: BE1716
SETTING CLASSIFICATION: Copper-Coated Rod
The bench mark is located 915 feet (279 m) east of the SW corner of the wooden
bridge over Parker Branch, 228 feet (69 m) ENE of Bench Mark 9039 C 1976, 52
feet (16 m) north of the centerline of the dirt drive an 7 feet (2 m) NNW of
power pole #E371SPP730 with a witness sign. The bench mark is crimped to the
top of a copper-coated rod driven 40 feet (12 m) to refusal, and encased in a
PVC pipe an concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 07/05/1984
Station ID: 8729039 SUPERCEDED DATE: 04/21/2003
Name: PARKER BRANCH, LAIRD BAYOU, EAST BAY
FLORIDA
NOAA Chart: 11389 Latitude: 30° 8.2' N
USGS Quad: SPRINGFIELD Longitude: 85° 31.0' W
T I D A L D A T U M S
Tidal datums at PARKER BRANCH, LAIRD BAYOU, EAST BAY based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: JULY-SEPTEMBER 1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8729015 ALLANTON EAST BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (09/26/1976) = 2.17
MEAN HIGHER HIGH WATER MHHW = 1.48
MEAN HIGH WATER MHW = 1.36
MEAN TIDE LEVEL MTL = 0.73
MEAN LOW WATER MLW = 0.11
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (10/12/1976) = -0.40
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
9039 A 1976 3.70 2.34
9039 B 1976 6.85 5.49
9039 C 1976 11.54 10.18
9039 D 1976 14.74 13.38
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 07/05/1984
Station ID: 8729039 SUPERCEDED DATE: 04/21/2003
Name: PARKER BRANCH, LAIRD BAYOU, EAST BAY
FLORIDA
NOAA Chart: 11389 Latitude: 30° 8.2' N
USGS Quad: SPRINGFIELD Longitude: 85° 31.0' 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.