U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8729793 PUBLICATION DATE: 05/12/2004
Name: MULLATTO BAYOU
FL
NOAA Chart: 11382 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: MILTON SOUTH Longitude: 87° 6.2' W ( -87.10330)
To reach the tidal bench marks from the interchange of Interstate Highway 10 and
County Road C-281, proceed north on County Road C-281 for 1.1 km (0.7 mi) to the
junction of Del Monte Street (County Road C-281A), then turn left and proceed
west on Del Monte Street for 0.9 km (0.6 mi) to San Miguel Street, then turn
right and proceed north and west on San Miguel Street for 1.0 km (0.6 mi) to the
James Ward residence (at 1509 San Miguel Street). The bench marks are along
San Miguel Street and Del Monte Street. The tide gage and staff were located at
the rear of the Ward residence.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9793 A 1977
DESIGNATION: 872 9793 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 10239
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4535
SETTING CLASSIFICATION: Concrete porch OPUS PID:
LATITUDE: 30° 32.8' N ( 30.54670) LONGITUDE: 87° 6.2' W ( -87.10330)
The primary bench mark is a disk set in the back porch of the residence at 1509
San Miguel Street, 24.26 m (79.6 ft) north of the centerline of San Miguel
Street, 3.41 m (11.2 ft) NW of the NW corner of the residence, 0.82 m (2.7 ft)
SW of the concrete steps leading to the water, 0.76 m (2.5 ft) NE of the NE
corner of a workshop, and 0.3 m (1.0 ft) south of the north face of the porch.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8729793 PUBLICATION DATE: 05/12/2004
Name: MULLATTO BAYOU
FL
NOAA Chart: 11382 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: MILTON SOUTH Longitude: 87° 6.2' W ( -87.10330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9793 B 1977
DESIGNATION: 872 9793 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 10240
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4536
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 30° 32.8' N ( 30.54670) LONGITUDE: 87° 6.3' W ( -87.10500)
The bench mark is a disk located along San Miguel Street between 15th Street and
16th Street, 12.19 m (40.0 ft) west of the centerline of the driveway to the
residence at 1505 San Miguel Street, 4.66 m (15.3 ft) north of the centerline of
San Miguel Street, and 2.62 m (8.6 ft) SW of a powerline pole with a witness
sign. 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.
BENCH MARK STAMPING: 9793 C 1977
DESIGNATION: 872 9793 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 10241
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4537
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 32.8' N ( 30.54670) LONGITUDE: 87° 6.4' W ( -87.10670)
The bench mark is a disk set in the top of a concrete monument, 253 m (830 ft)
south of bench mark 9793 D 1977, 16.58 m (54.4 ft) north of the centerline of
San Miguel Street, 10.58 m (34.7 ft) east of the centerline of Del Monte Street,
0.37 m (1.2 ft) west of a witness post, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8729793 PUBLICATION DATE: 05/12/2004
Name: MULLATTO BAYOU
FL
NOAA Chart: 11382 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: MILTON SOUTH Longitude: 87° 6.2' W ( -87.10330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9793 D
DESIGNATION: 872 9793 D TIDAL
MONUMENTATION: Survey disk VM#: 10242
AGENCY: Florida State Road Department (FLSRD) IDB PID#: BG4538
SETTING CLASSIFICATION: Concrete curb OPUS PID#: BG4538
LATITUDE: 30° 33.0' N ( 30.55000) LONGITUDE: 87° 6.4' W ( -87.10670)
The bench mark is a disk set in top of the concrete curbing, at the SE corner of
the County Road C-281A (Montecito Boulevard) bridge over Mulatto Bayou, 46.63 m
(153.0 ft) south of bench mark 9793 E 1977 4.11 m (13.5 ft) east of the
centerline of the road, and 0.15 m (0.5 ft) above the level of the road.
BENCH MARK STAMPING: 9793 E
DESIGNATION: 872 9793 E TIDAL
MONUMENTATION: Survey disk VM#: 10243
AGENCY: Florida State Road Department (FLSRD) IDB PID#: BG4539
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 30° 33.0' N ( 30.55000) LONGITUDE: 87° 6.4' W ( -87.10670)
The bench mark is a disk set in top of the concrete curbing at the NW corner of
the County Road C-281A (Montecito Boulevard) bridge over Mulatto Bayou, 5.03 m
(16.5 ft) west of the centerline of the road, and 0.15 m (0.5 ft) above the
level of the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8729793 PUBLICATION DATE: 05/12/2004
Name: MULLATTO BAYOU
FL
NOAA Chart: 11382 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: MILTON SOUTH Longitude: 87° 6.2' W ( -87.10330)
T I D A L D A T U M S
Tidal datums at MULLATTO BAYOU based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: April 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 = 0.451
MEAN HIGH WATER MHW = 0.442
MEAN TIDE LEVEL MTL = 0.234
MEAN SEA LEVEL MSL = 0.226
North American Vertical Datum NAVD88 = 0.128
MEAN LOW WATER MLW = 0.026
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9793 A 1977 3.123 2.681
9793 B 1977 2.875 2.433
9793 C 1977 2.371 1.929
9793 D 3.573 3.131
9793 E 3.743 3.301
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8729793 PUBLICATION DATE: 05/12/2004
Name: MULLATTO BAYOU
FL
NOAA Chart: 11382 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: MILTON SOUTH Longitude: 87° 6.2' W ( -87.10330)
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.