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Bench Mark Sheet for 8729376, SANTA ROSA HOGTOWN 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8729376                         PUBLICATION DATE:  05/20/2004
Name:       SANTA ROSA HOGTOWN BAYOU                          
            FL
NOAA Chart: 11388                           Latitude:   30° 24.0' N (  30.40000)
USGS Quad:  FREEPORT                        Longitude:  86° 13.7' W ( -86.22830)


To reach the tidal bench marks from the intersection of U.S. Highway 98 and
County Road 393 in Santa Rosa Beach, proceed north on County Road 393 for 2.6 km
(1.6 mi) to the Lions Park on the south shore of Hogtown Bayou.  The bench marks
are in the vicinity of Lions Park and along County Road 393.  The tide gage and
staff were located 58 m (190 ft) west of the highway and 9.14 m (30 ft) NE of a
boat launching ramp in Lions Park.


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


                 PRIMARY BENCH MARK STAMPING:  9376 A 1977
                         DESIGNATION:          872 9376 A 1977

MONUMENTATION:           Tidal Station disk                    VM#:        10101
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG3580
SETTING CLASSIFICATION:  Concrete chimmey foundation           OPUS PID#: BG3580
LATITUDE:   30° 23.9' N (  30.39830)          LONGITUDE:  86° 13.7' W ( -86.22830)


The primary bench mark is a disk set in the top of an old chimney foundation, 87
m (285 ft) west of the centerline of County Road 393, 16.00 m (52.5 ft) SE of
the SE corner of the westernmost covered picnic table in Lions Park, 2 m (5 ft)
north of a light pole, and 1.07 m (3.5 ft) above ground level.

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

                                                                                
Station ID: 8729376                         PUBLICATION DATE:  05/20/2004
Name:       SANTA ROSA HOGTOWN BAYOU                          
            FL
NOAA Chart: 11388                           Latitude:   30° 24.0' N (  30.40000)
USGS Quad:  FREEPORT                        Longitude:  86° 13.7' W ( -86.22830)


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


                         BENCH MARK STAMPING:  9376 B 1977
                         DESIGNATION:          872 9376 B

MONUMENTATION:           Tidal Station disk                    VM#:        10102
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG3581
SETTING CLASSIFICATION:  Concrete abutment                     OPUS PID:        
LATITUDE:   30° 23.9' N (  30.39830)          LONGITUDE:  86° 13.7' W ( -86.22830)


The bench mark is a disk set in the south abutment at the SW corner of the
bridge over Hogtown Bayou, 73 m (240 ft) SW of bench mark 1 1939, 4 m (14 ft)
west of the centerline of the bridge, and 0.46 m (1.5 ft) above the level of the
road.



                         BENCH MARK STAMPING:  1 1939
                         DESIGNATION:          872 9376 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:        10103
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BG3582
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 24.0' N (  30.40000)          LONGITUDE:  86° 13.7' W ( -86.22830)


The bench mark is a disk set in the top of a concrete monument, 61 m (200 ft)
north of the bridge over Hogtown Bayou, 12 m (41 ft) east of the centerline of
County Road 393, 27 m (90 ft) south of the SW corner of a wood frame house, and
0.3 m (1 ft) NNW of a 0.40 m (1.3 ft) diameter magnolia tree.

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

                                                                                
Station ID: 8729376                         PUBLICATION DATE:  05/20/2004
Name:       SANTA ROSA HOGTOWN BAYOU                          
            FL
NOAA Chart: 11388                           Latitude:   30° 24.0' N (  30.40000)
USGS Quad:  FREEPORT                        Longitude:  86° 13.7' W ( -86.22830)


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


                         BENCH MARK STAMPING:  3 1939
                         DESIGNATION:          872 9376 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:        10104
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BG3583
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 24.0' N (  30.40000)          LONGITUDE:  86° 13.7' W ( -86.22830)


The bench mark is a disk set in the top of a concrete monument located at the
east edge of the yard for the first house north of the bridge over Hogtown
Bayou, 51 m (166 ft) east of the centerline of County Road 393, 26 m (85 ft)
east of the SE corner of the house,18 m (58 ft) north of the approximate high
water line of the Bayou, and 0.06 m (0.2 ft)  above ground level.



                         BENCH MARK STAMPING:  9376 C 1992
                         DESIGNATION:          872 9376 C

MONUMENTATION:           Tidal Station disk                    VM#:        16528
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete racquet ball court           OPUS PID:        
LATITUDE:   30° 23.9' N (  30.39830)          LONGITUDE:  86° 13.7' W ( -86.22830)


The bench mark is a disk set flush in the SW corner of an open concrete racquet
ball court, 79.25 m (260.0 ft) SW of bench mark 9376 A 1977, 47.95 m (157.3 ft)
SW and 20.97 m (68.8 ft) from the water's edge due south of the pine tree at the
water's edge, and 0.46 m (1.5 ft) south of retaining wall of racquet ball court.

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

                                                                                
Station ID: 8729376                         PUBLICATION DATE:  05/20/2004
Name:       SANTA ROSA HOGTOWN BAYOU                          
            FL
NOAA Chart: 11388                           Latitude:   30° 24.0' N (  30.40000)
USGS Quad:  FREEPORT                        Longitude:  86° 13.7' W ( -86.22830)


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


                         BENCH MARK STAMPING:  9376 D 1992
                         DESIGNATION:          872 9376 D

MONUMENTATION:           Survey disk                           VM#:        16529
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   30° 23.9' N (  30.39830)          LONGITUDE:  86° 13.7' W ( -86.22830)


The bench mark is a disk set flush in the concrete foundation of picnic table,
43.46 m (142.6 ft) due east of bench mark 9376 A 1977, NE 24.44 m (80.2 ft) NE
of the NE corner of rest room facility, 28.71 m (94.2 ft) west of the centerline
of County Road 393, and 3 cm (0.1 ft) above ground level.

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

                                                                                
Station ID: 8729376                         PUBLICATION DATE:  05/20/2004
Name:       SANTA ROSA HOGTOWN BAYOU                          
            FL
NOAA Chart: 11388                           Latitude:   30° 24.0' N (  30.40000)
USGS Quad:  FREEPORT                        Longitude:  86° 13.7' W ( -86.22830)


                            T I D A L   D A T U M S 


Tidal datums at SANTA ROSA HOGTOWN BAYOU based on:

     LENGTH OF SERIES:      5 MONTHS
     TIME PERIOD:           June 1992 - October 1992
     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   =  0.178
     MEAN HIGH WATER                            MHW    =  0.169
     MEAN SEA LEVEL                             MSL    =  0.094
     MEAN TIDE LEVEL                            MTL    =  0.093
     MEAN LOW WATER                             MLW    =  0.008
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     North American Vertical Datum              NAVD88 = -0.021

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9376 A 1977                                 1.745    1.576
     9376 B 1977                                 1.877    1.708
     1 1939                                      0.714    0.545
     3 1939                                      0.811    0.642
     9376 C 1992                                 0.803    0.634
     9376 D 1992                                 0.948    0.779


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

                                                                                
Station ID: 8729376                         PUBLICATION DATE:  05/20/2004
Name:       SANTA ROSA HOGTOWN BAYOU                          
            FL
NOAA Chart: 11388                           Latitude:   30° 24.0' N (  30.40000)
USGS Quad:  FREEPORT                        Longitude:  86° 13.7' W ( -86.22830)


                             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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Revised: 08/08/2018
NOAA / National Ocean Service
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