U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8729889 PUBLICATION DATE: 05/20/2004
Name: HEAD OF BAYOU GRANDE
FL
NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000)
USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830)
To reach the tidal bench marks from the intersection of Navy Boulevard (State
Road 295) and Gulf Beach Highway (State Road 292) in Warrington, proceed SW on
Gulf Beach Highway for 4.5 km (2.8 mi) to Waycoss Avenue, then south on Waycross
Avenue for 0.40 km (0.25 mi) to Bayou Grande. The bench marks are along
Waycross Avenue. The tide gage and staff were located on the dock at the
residence of Mr. John Early, at 4 Waycross Avenue.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9889 A 1977
DESIGNATION: 872 9889 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 10297
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4544
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 22.3' N ( 30.37170) LONGITUDE: 87° 19.2' W ( -87.32000)
The primary bench mark is a disk located SE of the intersection of Waycross
Avenue and Sunnyside Street, 126 m (413 ft) SE of bench mark 9889 B 1977, 7.62 m
(25.0 ft) NE of the centerline of Waycross Avenue, 4.02 m (13.2 ft) SE of the
centerline of Sunnyside Street, and 0.73 m (2.4 ft) SW of a powerline pole. The
bench mark is set 18 cm (0.6 ft) below ground level, crimped to the top of a
copper-clad steel rod driven 12.2 m (40 ft) 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 2 of 5
Station ID: 8729889 PUBLICATION DATE: 05/20/2004
Name: HEAD OF BAYOU GRANDE
FL
NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000)
USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9889 B 1977
DESIGNATION: 872 9889 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 10298
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4543
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 22.3' N ( 30.37170) LONGITUDE: 87° 19.3' W ( -87.32170)
The bench mark is a disk located near the east property corner of 115 Waycross
Avenue, 126 m (413 ft) NW of bench mark 9889 A 1977, 19.69 m (64.6 ft) east of
the east corner of house # 115, 10 m (34 ft) SW of the centerline of Waycross
Avenue, and 1.25 m (4.1 ft) ESE of a powerline pole. The bench mark is set 15
cm (0.5 ft) below ground level, crimped to the top of a copper clad steel rod
driven 12.2 m (40 ft) to refusal, and encased in a PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 9889 C 1977
DESIGNATION: 872 9889 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 10299
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4540
SETTING CLASSIFICATION: Concrete monument OPUS PID#: BG4540
LATITUDE: 30° 22.5' N ( 30.37500) LONGITUDE: 87° 19.3' W ( -87.32170)
The bench mark is a disk set in the top of a concrete monument, near the
intersection of Waycross Avenue and Gulf Beach Highway, 15 m (50 ft) NW of the
residence at 220 Waycross Avenue, 10.73 m (35.2 ft) SE of the centerline of the
highway, 9 m (30.0 ft) ENE of the centerline of Waycross Avenue, 0.55 m (1.8 ft)
NW of a witness post, 1.37 m (4.5 ft) NW of a 0.3 m (1 ft) diameter pine tree,
and 6 cm (0.2 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8729889 PUBLICATION DATE: 05/20/2004
Name: HEAD OF BAYOU GRANDE
FL
NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000)
USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9889 D 1977
DESIGNATION: 872 9889 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 10300
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4542
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 30° 22.4' N ( 30.37330) LONGITUDE: 87° 19.3' W ( -87.32170)
The bench mark is a disk, located near the intersection of Waycross Avenue and
Stonewall Street, 215 m (707 ft) NW of bench mark 9889 A 1977, 18.11 m (59.4 ft)
NW of a powerline pole, 9.48 m (31.1 ft) NE of the centerline of Waycross
Avenue, 8.96 m (29.4 ft) NW of the centerline of Stonewall Street, and 0.3 m (1
ft) SE of a bamboo fence. The bench mark is set 6 cm (0.2 ft) below ground
level, crimped to the top of a galvanized steel rod driven 12.2 m (40 ft) to
refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 9889 E 1977
DESIGNATION: 872 9889 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 10301
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4541
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 30° 22.5' N ( 30.37500) LONGITUDE: 87° 19.3' W ( -87.32170)
The bench mark is a disk located 90 m (295 ft) south of bench mark 9889 C 1977,
20 m (67 ft) NW of powerline pole # 1103951063, 5.94 m (19.5 ft) NE of the
centerline of Waycross Avenue, 0.98 m (3.2 ft) SE of a fence corner, and
directly under a chainlink fence. The bench mark is set 12 cm (0.4 ft) below
ground level, crimped to the top of a galvanized steel rod driven 12.2 m (40 ft)
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 4 of 5
Station ID: 8729889 PUBLICATION DATE: 05/20/2004
Name: HEAD OF BAYOU GRANDE
FL
NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000)
USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830)
T I D A L D A T U M S
Tidal datums at HEAD OF BAYOU GRANDE based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: March 1977 - May 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 = 0.376
MEAN HIGH WATER MHW = 0.366
MEAN TIDE LEVEL MTL = 0.187
MEAN SEA LEVEL MSL = 0.185
North American Vertical Datum NAVD88 = 0.089
MEAN LOW WATER MLW = 0.007
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9889 A 1977 2.049 1.683
9889 B 1977 4.667 4.301
9889 C 1977 5.661 5.295
9889 D 1977 5.670 5.304
9889 E 1977 5.544 5.178
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8729889 PUBLICATION DATE: 05/20/2004
Name: HEAD OF BAYOU GRANDE
FL
NOAA Chart: 11383 Latitude: 30° 22.2' N ( 30.37000)
USGS Quad: FORT BARRANCAS Longitude: 87° 19.1' W ( -87.31830)
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.