U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8729831 PUBLICATION DATE: 04/13/2005
Name: FERRY PASS, ESCAMBIA BAY
FL
NOAA Chart: 11383 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: PACE Longitude: 87° 11.7' W ( -87.19500)
To reach the tidal bench marks from the south end of the U.S. Highway 90 bridge
over Escambia River, proceed SW for 0.3 km (0.2 mi) on U.S. Highway 90 to Smiths
Fish Camp Road on the south side of the highway, then turn left and proceed
north on Smiths Fish Camp Road to its end at Smiths Fish Camp. The bench marks
are on and under the bridge, and at the fish camp. The tide gage and staff were
located on a pier SE of the fish camp bait house.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9831 A 1977
DESIGNATION: 872 9831 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 10268
AGENCY: National Ocean Survey (NOS) IDB PID#: BG3592
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 30° 32.7' N ( 30.54500) LONGITUDE: 87° 11.7' W ( -87.19500)
The primary bench mark is a disk located under the southernmost end of the U.S.
Highway 90 bridge over Escambia River, 46 m (152 ft) south of the shoreline,
12.41 m (40.7 ft) ESE of the east edge of the easternmost concrete bridge
trestle, 38 m (127 ft) ESE of bench mark 9831 C 1977, and 0.15 m (0.5 ft) west
of a witness post. The bench mark is 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 2 of 5
Station ID: 8729831 PUBLICATION DATE: 04/13/2005
Name: FERRY PASS, ESCAMBIA BAY
FL
NOAA Chart: 11383 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: PACE Longitude: 87° 11.7' W ( -87.19500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9831 C 1977
DESIGNATION: 872 9831 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 10269
AGENCY: National Ocean Survey (NOS) IDB PID#: BG3593
SETTING CLASSIFICATION: Bridge pier foundation OPUS PID:
LATITUDE: 30° 32.8' N ( 30.54670) LONGITUDE: 87° 11.8' W ( -87.19670)
The bench mark is a disk set in top of the concrete foundation of the
southernmost pier support at the west end of the bridge, 38.71 m (127.0 ft) NW
of bench mark 9831 A 1977, 9 m (29 ft) north of the bottom of the concrete
filled bagwall bridge, and 1 m (3 ft) above ground level.
BENCH MARK STAMPING: 2 29.88
DESIGNATION: 2 29.88 FLDT
MONUMENTATION: Survey disk VM#: 10270
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: BG3591
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: 30° 32.8' N ( 30.54670) LONGITUDE: 87° 11.8' W ( -87.19670)
The bench mark is a disk set in top of the south abutment of the eastbound
bridge, 5.67 m (18.6 ft) ESE of the centerline of the bridge, and level with the
highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8729831 PUBLICATION DATE: 04/13/2005
Name: FERRY PASS, ESCAMBIA BAY
FL
NOAA Chart: 11383 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: PACE Longitude: 87° 11.7' W ( -87.19500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 48-74-X3 37.20
DESIGNATION: 48 74 X 3 FLDT
MONUMENTATION: Survey disk VM#: 10271
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: BG3595
SETTING CLASSIFICATION: Concrete bridge railing OPUS PID:
LATITUDE: 30° 32.8' N ( 30.54670) LONGITUDE: 87° 11.8' W ( -87.19670)
The bench mark is a disk set in top of the east railing at the south end of the
westernmost U.S. Highway 90 bridge, 5.49 m (18.0 ft) ESE of the centerline of
the westbound lane of the highway, 0.9 m (3.0 ft) north of the south end of the
railing, and 1 m (3 ft) above highway level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8729831 PUBLICATION DATE: 04/13/2005
Name: FERRY PASS, ESCAMBIA BAY
FL
NOAA Chart: 11383 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: PACE Longitude: 87° 11.7' W ( -87.19500)
T I D A L D A T U M S
Tidal datums at FERRY PASS, ESCAMBIA BAY based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: April 1977 - June 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 = 0.421
MEAN HIGH WATER MHW = 0.411
MEAN TIDE LEVEL MTL = 0.217
MEAN SEA LEVEL MSL = 0.197
MEAN LOW WATER MLW = 0.022
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9831 A 1977 1.467 1.056
9831 C 1977 1.965 1.554
2 29.88 9.086 8.675
48-74-X3 37.20 11.312 10.901
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8729831 PUBLICATION DATE: 04/13/2005
Name: FERRY PASS, ESCAMBIA BAY
FL
NOAA Chart: 11383 Latitude: 30° 32.7' N ( 30.54500)
USGS Quad: PACE Longitude: 87° 11.7' W ( -87.19500)
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.