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Bench Mark Sheet for 8729364, ALLAQUAY BAYOU 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8729364                         PUBLICATION DATE:  04/29/2004
Name:       ALLAQUAY BAYOU                                    
            FL
NOAA Chart: 11388                           Latitude:   30° 29.3' N (  30.48830)
USGS Quad:  FREEPORT                        Longitude:  86° 12.3' W ( -86.20500)


To reach the tidal bench marks from the junction of U.S. Highway 331 (North) and
State Highway 20 in Freeport, proceed west on State Highway 20 for 6.9 km (4.3
mi) to Whitfield Road, proceed south on Whitfield Road for 2.16 km (1.35 mi) to
its end at a private fish camp.  The bench marks are along the drive (extension
of Whitfield Road) to the fish camp.  The tide gage and staff were located on a
private dock at the fish camp.


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


                 PRIMARY BENCH MARK STAMPING:  9364 A 1977
                         DESIGNATION:          872 9364 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10096
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG4608
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 29.4' N (  30.49000)          LONGITUDE:  86° 12.4' W ( -86.20670)


The bench mark is a disk set in the top of a concrete monument, 79 m (715 ft)
south of bench mark 9364 B 1977, 30.33 m (99.5 ft) ENE of the NE corner of the
main cabin, 21 m (70 ft) north of the shoreline, and 7.19 m (23.6 ft) NW of the
NW corner of the pumphouse.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8729364                         PUBLICATION DATE:  04/29/2004
Name:       ALLAQUAY BAYOU                                    
            FL
NOAA Chart: 11388                           Latitude:   30° 29.3' N (  30.48830)
USGS Quad:  FREEPORT                        Longitude:  86° 12.3' W ( -86.20500)


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


                         BENCH MARK STAMPING:  9364 B 1977
                         DESIGNATION:          872 9364 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10097
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG4607
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   30° 29.4' N (  30.49000)          LONGITUDE:  86° 12.3' W ( -86.20500)


The bench mark is a disk located 103 m (338 ft) SSE of bench mark 9364 C 1977,
17.68 m (58.0 ft) NNW of the NW corner of  the northeasternmost cottage, 4.15 m
(13.6 ft) east of the centerline of the drive, and 0.40 m (1.3 ft) west of a
witness post.  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, encased
in a PVC pipe and a concrete kickblock.



                         BENCH MARK STAMPING:  9364 C 1977
                         DESIGNATION:          872 9364 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10098
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG4606
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   30° 29.5' N (  30.49170)          LONGITUDE:  86° 12.3' W ( -86.20500)


The bench mark is a disk located 82 m (269 ft) SSE of bench mark 9364 D 1977 and
4.72 m (15.5 ft) ENE of the centerline of the drive, 10.36 m (34.0 ft) SSW of a
0.6 m (2 ft) diameter oak tree, 64.47 m (211.5 ft) SSE of the northernmost
powerline pole on the property, and 0.40 m (1.3 ft) WSW of a witness post.  The
bench mark is set 6 cm (0.2 ft) above ground level, crimped to the top of a
galvanized steel rod driven 12.2 m (40 ft) to refusal, encased in a PVC pipe and
a concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 8729364                         PUBLICATION DATE:  04/29/2004
Name:       ALLAQUAY BAYOU                                    
            FL
NOAA Chart: 11388                           Latitude:   30° 29.3' N (  30.48830)
USGS Quad:  FREEPORT                        Longitude:  86° 12.3' W ( -86.20500)


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


                         BENCH MARK STAMPING:  9364 D 1977
                         DESIGNATION:          872 9364 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10099
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG4605
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   30° 29.5' N (  30.49170)          LONGITUDE:  86° 12.4' W ( -86.20670)


The bench mark is a disk located 74.68 m (245.0 ft) SW of bench mark 9364 E
1977, 31 m (101 ft) NE of the northernmost powerline pole on the property, 50 m
(165 ft) SW of the SE end of a corrugated pipe under the drive, 5.33 m (17.5 ft)
WNW of the centerline of the drive, and 0.49 m (1.6 ft) ESE of a witness post. 
The bench mark is set at ground level, crimped to the top of a galvanized steel
rod driven 11.0 m (36 ft) to refusal, encased in a PVC pipe and a concrete
kickblock.



                         BENCH MARK STAMPING:  9364 E 1977
                         DESIGNATION:          872 9364 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10100
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG4604
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   30° 29.5' N (  30.49170)          LONGITUDE:  86° 12.3' W ( -86.20500)


The bench mark is a disk located 283 m (930 ft) north of the shoreline, 23.41 m
(76.8 ft) NE of the SE end of a corrugated pipe culvert under the drive at a
90-degree curve in the drive, 3 m (10 ft) south of the east-west fence line,
3.20 m (10.5 ft) north of the centerline of Whitfield Road, and 0.37 m (1.2 ft)
south of a witness post.  The bench mark is set at ground level, crimped to the
top of a galvanized steel rod driven to refusal, encased in PVC pipe and
concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 8729364                         PUBLICATION DATE:  04/29/2004
Name:       ALLAQUAY BAYOU                                    
            FL
NOAA Chart: 11388                           Latitude:   30° 29.3' N (  30.48830)
USGS Quad:  FREEPORT                        Longitude:  86° 12.3' W ( -86.20500)


                            T I D A L   D A T U M S 


Tidal datums at ALLAQUAY BAYOU based on:

     LENGTH OF SERIES:      5 MONTHS
     TIME PERIOD:           July 1977 - November 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   =  0.153
     MEAN HIGH WATER                            MHW    =  0.146
     MEAN TIDE LEVEL                            MTL    =  0.075
     MEAN SEA LEVEL                             MSL    =  0.073
     MEAN LOW WATER                             MLW    =  0.003
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     North American Vertical Datum              NAVD88 = -0.032

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9364 A 1977                                 0.838    0.692
     9364 B 1977                                 0.654    0.508
     9364 C 1977                                 0.735    0.589
     9364 D 1977                                 0.589    0.443
     9364 E 1977                                 0.729    0.583


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

                                                                                
Station ID: 8729364                         PUBLICATION DATE:  04/29/2004
Name:       ALLAQUAY BAYOU                                    
            FL
NOAA Chart: 11388                           Latitude:   30° 29.3' N (  30.48830)
USGS Quad:  FREEPORT                        Longitude:  86° 12.3' W ( -86.20500)


                             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.

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Products available at 8729364 ALLAQUAY BAYOU, FL

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services