U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8729949 PUBLICATION DATE: 08/03/2004
Name: NORTH PERDIDO RIVER
FL
NOAA Chart: 11382 Latitude: 30° 31.4' N ( 30.52330)
USGS Quad: SEMINOLE Longitude: 87° 26.6' W ( -87.44330)
To reach the tidal bench marks from the junction of U.S. Highway 90 and U.S.
Alternate 90 west of Pensacola, proceed west on U.S. Highway 90 for 3.5 km (2.2
mi) to the junction of Ruby's Camp Road, then turn right and proceed north on
Ruby's Camp Road for 0.2 km (0.1 mi) to its end at the water's edge. The bench
marks are along U.S. Highway 90 and Ruby's Camp Road. The tide gage and staff
were located on a private dock at Ruby's Fish Camp.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9949 A 1977
DESIGNATION: 872 9949 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 10321
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4531
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 30° 31.4' N ( 30.52330) LONGITUDE: 87° 26.6' W ( -87.44330)
The primary bench mark is a disk located 0.2 km (0.1 mi) north of U.S. Highway
90, 17 m (56 ft) east of the waters edge, 10.79 m (35.4 ft) north of a power
pole with a light, 9.57 m (31.4 ft) WNW of the SW corner of Ruby's Fish Camp
Baithouse and 5 m (16 ft) NE of a shell covered road leading to a boat ramp.
The bench mark is crimped to the top of a galvanized steel rod driven 12.2 m (40
ft), 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 8
Station ID: 8729949 PUBLICATION DATE: 08/03/2004
Name: NORTH PERDIDO RIVER
FL
NOAA Chart: 11382 Latitude: 30° 31.4' N ( 30.52330)
USGS Quad: SEMINOLE Longitude: 87° 26.6' W ( -87.44330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9949 B 1977
DESIGNATION: 872 9949 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 10322
AGENCY: National Ocean Survey (NOS) IDB PID#: BG4530
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 30° 31.4' N ( 30.52330) LONGITUDE: 87° 26.6' W ( -87.44330)
The bench mark is a disk located 24.02 m (78.8 ft) north of the centerline of
U.S. Highway 90, 7.19 m (23.6 ft) west of the centerline of Ruby's Camp Road,
1.68 m (5.5 ft) north of a concrete road marker, and 0.15 m (0.5 ft) east of a
witness post. The bench mark is set at 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 3 of 8
Station ID: 8729949 PUBLICATION DATE: 08/03/2004
Name: NORTH PERDIDO RIVER
FL
NOAA Chart: 11382 Latitude: 30° 31.4' N ( 30.52330)
USGS Quad: SEMINOLE Longitude: 87° 26.6' W ( -87.44330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 872 9949 C TIDAL
ALIAS: NO STAMPING 1
MONUMENTATION: Survey disk VM#: 10323
AGENCY: Dickinson Maker Company IDB PID#: BG4529
SETTING CLASSIFICATION: Concrete curbing OPUS PID:
LATITUDE: 30° 31.3' N ( 30.52170) LONGITUDE: 87° 26.7' W ( -87.44500)
The bench mark is a galvabuzed disk 6 cm (0.2 ft) in diameter with a projected
point, set in the top of the concrete curb at the NE end of the U.S. Highway 90
bridge over the Perdido River, 5 m (15 ft) north of the centerline of the
bridge. NOTE: This mark was designated as 9949 C.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8729949 PUBLICATION DATE: 08/03/2004
Name: NORTH PERDIDO RIVER
FL
NOAA Chart: 11382 Latitude: 30° 31.4' N ( 30.52330)
USGS Quad: SEMINOLE Longitude: 87° 26.6' W ( -87.44330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 872 9949 D TIDAL
ALIAS: NO STAMPING 2
MONUMENTATION: Survey disk VM#: 10324
AGENCY: Dickinson Marker Company IDB PID#: BG4532
SETTING CLASSIFICATION: Concrete curbing OPUS PID:
LATITUDE: 30° 31.3' N ( 30.52170) LONGITUDE: 87° 26.9' W ( -87.44830)
The bench mark is a disk, set in the concrete curb at the SW corner of the U.S.
Highway 90 bridge over the Perdido River, the northernmost of two identical
markers [6 cm (0.2 ft) diameter galvanized disks with a projected high point],
and 4.72 m (15.5 ft) south of the centerline of the bridge. NOTE: This mark
was designated as 9949 D.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8729949 PUBLICATION DATE: 08/03/2004
Name: NORTH PERDIDO RIVER
FL
NOAA Chart: 11382 Latitude: 30° 31.4' N ( 30.52330)
USGS Quad: SEMINOLE Longitude: 87° 26.6' W ( -87.44330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: H 303 1968
DESIGNATION: H 303
MONUMENTATION: Bench Mark disk VM#: 10325
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BG0101
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: 30° 31.3' N ( 30.52170) LONGITUDE: 87° 26.7' W ( -87.44500)
The bench mark is a disk set in the top of the north end of the east concrete
abutment of the U.S. Highway 90 bridge over the Perdido River, 5.85 m (19.2 ft)
north of the centerline of the highway, 0.88 m (2.9 ft) south of the north end
of the abutment, and 0.30 m (1.0 ft) above the level of the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8729949 PUBLICATION DATE: 08/03/2004
Name: NORTH PERDIDO RIVER
FL
NOAA Chart: 11382 Latitude: 30° 31.4' N ( 30.52330)
USGS Quad: SEMINOLE Longitude: 87° 26.6' W ( -87.44330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: V 435 1968
DESIGNATION: V 435
MONUMENTATION: Bench Mark disk VM#: 10326
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BG0100
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: 30° 31.3' N ( 30.52170) LONGITUDE: 87° 27.2' W ( -87.45330)
The bench mark is a disk set in the top of the south end of the west concrete
abutment of a concrete bridge over a low area, 0.5 km (0.3 mi) west of the west
end of the U.S. Highway 90 bridge over the Perdido River, 5.33 m (17.5 ft) south
of the centerline of the highway, and 0.30 m (1 ft) above the level of the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8729949 PUBLICATION DATE: 08/03/2004
Name: NORTH PERDIDO RIVER
FL
NOAA Chart: 11382 Latitude: 30° 31.4' N ( 30.52330)
USGS Quad: SEMINOLE Longitude: 87° 26.6' W ( -87.44330)
T I D A L D A T U M S
Tidal datums at NORTH PERDIDO RIVER based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: April 1977 - July 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8729962 PERDIDO BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.253
MEAN HIGH WATER MHW = 0.243
MEAN TIDE LEVEL MTL = 0.130
MEAN SEA LEVEL MSL = 0.121
MEAN LOW WATER MLW = 0.016
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.030
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9949 A 1977 3.343 3.100
9949 B 1977 3.958 3.715
872 9949 C TIDAL 6.907 6.664
872 9949 D TIDAL 6.915 6.672
H 303 1968 6.892 6.649
V 435 1968 6.304 6.061
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8729949 PUBLICATION DATE: 08/03/2004
Name: NORTH PERDIDO RIVER
FL
NOAA Chart: 11382 Latitude: 30° 31.4' N ( 30.52330)
USGS Quad: SEMINOLE Longitude: 87° 26.6' W ( -87.44330)
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.