U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8729329 PUBLICATION DATE: 05/20/2004
Name: CHOCTAWHATCHEE RIVER
FL
NOAA Chart: 11388 Latitude: 30° 23.8' N ( 30.39670)
USGS Quad: BUNKER Longitude: 86° 5.3' W ( -86.08830)
To reach the tidal bench marks from the north end of the State Highway 79 bridge
over West Bay Creek (Intracoastal Waterway) in West Bay, proceed north on State
Highway 79 for 4.5 km (2.8 mi) to Steelfield Road, then west on Steelfield Road
for 15.9 km (9.9 mi) to the Y-junction of Bunker Road, then west and north on
Bunker Road for 12.4 km (7.7 mi) to a sand road leading west. The bench marks
are along the sand road and Bunker Road. The tide gage and staff were located
on the end of a wood dock behind the residence of Olin Cheshire.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9329 A 1977
DESIGNATION: 872 9329 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 10075
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4631
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 23.8' N ( 30.39670) LONGITUDE: 86° 5.3' W ( -86.08830)
The primary bench mark is a disk set in the top of a concrete monument, 122 m
(400 ft) west of Bunker Road, 22 m (73 ft) north of the centerline of the
east-west sand road, 11 m (35 ft) ESE of the easternmost end of the dock of a
private residence, 8 m (25 ft) east of the NE corner of the remaining foundation
of a burned out A-frame residence, 0.37 m (1.2 ft) north of the NW corner of the
small A-frame shed that is east of the burned out residence, and 6 cm (0.2 ft)
below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8729329 PUBLICATION DATE: 05/20/2004
Name: CHOCTAWHATCHEE RIVER
FL
NOAA Chart: 11388 Latitude: 30° 23.8' N ( 30.39670)
USGS Quad: BUNKER Longitude: 86° 5.3' W ( -86.08830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9329 C 1977
DESIGNATION: 872 9329 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 10077
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4632
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 23.8' N ( 30.39670) LONGITUDE: 86° 5.3' W ( -86.08830)
The bench mark is a disk set in the top of a concrete monument, 130 m (425 ft)
west of Bunker Road, 65 m (212 ft) ENE of bench mark 9329 D 1977, 3.17 m (10.4
ft) north of the centerline of the sand road, 0.52 m (1.7 ft) ESE of a powerline
pole with a witness sign, 130 m (425 ft) west of Bunker Road, and 3 cm (0.1 ft)
below ground level.
BENCH MARK STAMPING: 9329 D 1977
DESIGNATION: 872 9329 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 10078
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4633
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 23.8' N ( 30.39670) LONGITUDE: 86° 5.3' W ( -86.08830)
The bench mark is a disk set flush in the top of a concrete monument, 183 m (600
ft) west of the end of Bunker Road, 15 m (50 ft) SSE of the SE corner of the
black house on the north side of and near the west end of the sand road, 4 m (12
ft) south of the centerline of the sand road, and 2 m (5 ft) north of a
powerline pole with a witness sign.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8729329 PUBLICATION DATE: 05/20/2004
Name: CHOCTAWHATCHEE RIVER
FL
NOAA Chart: 11388 Latitude: 30° 23.8' N ( 30.39670)
USGS Quad: BUNKER Longitude: 86° 5.3' W ( -86.08830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9329 E 1977
DESIGNATION: 872 9329 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 10079
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4630
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 23.8' N ( 30.39670) LONGITUDE: 86° 5.3' W ( -86.08830)
The bench mark is a disk set in the top of a concrete monument, 5 m (16 ft) east
of the drive to the house at the NW corner of the junction of the sand road and
Bunker Road, 3.44 m (11.3 ft) north of the centerline of the sand road, and 1.58
m (5.2 ft) SW of a powerline pole with a witness sign.
BENCH MARK STAMPING: 9329 F 1985
DESIGNATION: 872 9329 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 10080
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4629
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 23.8' N ( 30.39670) LONGITUDE: 86° 5.3' W ( -86.08830)
The bench mark is a disk set in the top of a concrete monument, 0.4 km (0.25 mi)
south of bench mark 9329 E 1977, 17 m (57 ft) SE of the across Lazy Bone Street
from a powerline pole with a transformer #15, 15 m (49 ft) SW of and across
Bunker Road from an anchor pole, 7.62 m (25.0 ft) WSW of the centerline of
Bunker Road, 4.88 m (16.0 ft) SSE of the centerline of Lazy Bone Street, and
0.46 m (1.5 ft) NE of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8729329 PUBLICATION DATE: 05/20/2004
Name: CHOCTAWHATCHEE RIVER
FL
NOAA Chart: 11388 Latitude: 30° 23.8' N ( 30.39670)
USGS Quad: BUNKER Longitude: 86° 5.3' W ( -86.08830)
T I D A L D A T U M S
Tidal datums at CHOCTAWHATCHEE RIVER based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: July 1977 - October 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:
MEAN HIGHER HIGH WATER MHHW = 0.167
MEAN HIGH WATER MHW = 0.149
MEAN TIDE LEVEL MTL = 0.081
MEAN SEA LEVEL MSL = 0.080
MEAN LOW WATER MLW = 0.013
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.021
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9329 A 1977 1.244 1.095
9329 C 1977 1.110 0.961
9329 D 1977 1.261 1.112
9329 E 1977 1.636 1.487
9329 F 1985 1.342 1.193
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8729329 PUBLICATION DATE: 05/20/2004
Name: CHOCTAWHATCHEE RIVER
FL
NOAA Chart: 11388 Latitude: 30° 23.8' N ( 30.39670)
USGS Quad: BUNKER Longitude: 86° 5.3' W ( -86.08830)
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.