Bench Mark Sheet for 8729169, SHELL POINT, WEST BAY FL

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                                                
Station ID: 8729169                         PUBLICATION DATE:  09/15/2004
Name:       SHELL POINT, WEST BAY                             
            FL
NOAA Chart: 11389                           Latitude:   30° 12.9' N (  30.21500)
USGS Quad:  PANAMA CITY                     Longitude:  85° 44.4' W ( -85.74000)


To reach the tidal bench marks from the boat launch at the Carl Grey Park on the
NE side of the Hathaway Bridge over West Bay, proceed 2.4 km (1.72 nautical mi)
NNW to Shell Point.  The gage site was 183 m (600 ft) SE of the point.  The
bench marks are in the near area.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  9169 A 1976
                         DESIGNATION:          872 9169 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10039
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30° 12.9' N (  30.21500)          LONGITUDE:  85° 44.4' W ( -85.74000)


The primary bench mark is a disk located 42.37 m (139.0 ft) NNE of bench mark
9169 B 1976, 9 m (30 ft) west of the shoreline, 7.65 m (25.1 ft) south of a lone
oak tree, and 12 cm (0.4 ft) east of a witness post.  The bench mark is set 0.15
m (0.5 ft) below ground surface, crimped to the top of a copper-coated steel rod
driven 12.2 m (40.0 ft) to refusal, and encased in a PVC protector pipe and
concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8729169                         PUBLICATION DATE:  09/15/2004
Name:       SHELL POINT, WEST BAY                             
            FL
NOAA Chart: 11389                           Latitude:   30° 12.9' N (  30.21500)
USGS Quad:  PANAMA CITY                     Longitude:  85° 44.4' W ( -85.74000)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  9169 B 1976
                         DESIGNATION:          872 9169 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10040
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30° 12.9' N (  30.21500)          LONGITUDE:  85° 44.4' W ( -85.74000)


The bench mark is a disk located 97 m (318 ft) NE of bench mark 9169 C 1976,
42.37 m (139.0 ft) SSW of bench mark 9169 A 1976, 8.41 m (27.6 ft) west of the
shoreline, 9 cm (0.3 ft) east of a small single oak tree, and 6 cm (0.2 ft) NE
of a witness post.  The bench mark is set 0.15 m (0.5 ft) below ground surface,
crimped to the top of a copper-coated steel rod driven 12.2 m (40.0 ft) to
refusal, and encased in a PVC protector pipe and concrete kickblock.



                         BENCH MARK STAMPING:  9169 C 1976
                         DESIGNATION:          872 9169 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10041
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30° 12.9' N (  30.21500)          LONGITUDE:  85° 44.4' W ( -85.74000)


The bench mark is a disk located 97 m (318 ft) SW of bench mark 9169 B 1976,
94.18 m (309.0 ft) SSW of  bench mark 9169 D 1976, 61 m (200 ft) SE of a line of
trees, 30.48 m (100.0 ft) west of the shoreline, and 2 cm (0.4 ft) north of a
witness post.  The bench mark is set 0.15 m (0.5 ft) below ground surface,
crimped to the top of a copper-coated steel rod driven 12.2 m (40.0 ft) to
refusal, and encased in a PVC protector pipe and concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8729169                         PUBLICATION DATE:  09/15/2004
Name:       SHELL POINT, WEST BAY                             
            FL
NOAA Chart: 11389                           Latitude:   30° 12.9' N (  30.21500)
USGS Quad:  PANAMA CITY                     Longitude:  85° 44.4' W ( -85.74000)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  9169 D 1976
                         DESIGNATION:          872 9169 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10042
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30° 12.9' N (  30.21500)          LONGITUDE:  85° 44.4' W ( -85.74000)


The bench mark is a disk located 94.18 m (309.0 ft)  north of bench mark 9169 C
1976, 45.72 m (150.0 ft) west of the shoreline, 10.88 m (35.7 ft) east of the
center of a small group of scrub oak, and 12 cm (0.4 ft) south of a witness
post.  The bench mark is set 0.15 m (0.5 ft) below ground surface, crimped to
the top of a copper-coated steel rod driven 9.8 m (32.0 ft) to refusal, and
encased in a PVC protector pipe and concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8729169                         PUBLICATION DATE:  09/15/2004
Name:       SHELL POINT, WEST BAY                             
            FL
NOAA Chart: 11389                           Latitude:   30° 12.9' N (  30.21500)
USGS Quad:  PANAMA CITY                     Longitude:  85° 44.4' W ( -85.74000)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  WEST BAY PT 2 NO 2
                         DESIGNATION:          WEST BAY POINT 2 RM 2

MONUMENTATION:           Reference Mark disk                   VM#:        10043
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AC8610
SETTING CLASSIFICATION:  Concrete filled tile post             OPUS PID:        
LATITUDE:   30° 12.9' N (  30.21500)          LONGITUDE:  85° 44.4' W ( -85.74000)


The bench mark is a disk set into the top of a concrete filled tile post,  north
of a line of cedar trees, 88.39 m (290.0 ft) NE of bench mark 9169 D 1976, 48.01
m (157.5 ft) NW of the NE end of a dirt road, and 14.69 m (48.2 ft) SW of the
high water mark.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8729169                         PUBLICATION DATE:  09/15/2004
Name:       SHELL POINT, WEST BAY                             
            FL
NOAA Chart: 11389                           Latitude:   30° 12.9' N (  30.21500)
USGS Quad:  PANAMA CITY                     Longitude:  85° 44.4' W ( -85.74000)


                            T I D A L   D A T U M S 


Tidal datums at SHELL POINT, WEST BAY based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           October 1976 - November 1976
     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   =  0.418
     MEAN HIGH WATER                            MHW    =  0.400
     MEAN TIDE LEVEL                            MTL    =  0.218
     MEAN SEA LEVEL                             MSL    =  0.171
     MEAN LOW WATER                             MLW    =  0.035
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9169 A 1976                                 0.530    0.130
     9169 B 1976                                 0.651    0.251
     9169 C 1976                                 0.290   -0.110
     9169 D 1976                                 0.369   -0.031
     WEST BAY PT 2 NO 2                          0.566    0.166


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  6

                                                                                
Station ID: 8729169                         PUBLICATION DATE:  09/15/2004
Name:       SHELL POINT, WEST BAY                             
            FL
NOAA Chart: 11389                           Latitude:   30° 12.9' N (  30.21500)
USGS Quad:  PANAMA CITY                     Longitude:  85° 44.4' W ( -85.74000)


                             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.

Return to Top
Products available at 8729169 SHELL POINT, WEST BAY, FL