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Bench Mark Sheet for 8729849, BAYOU CHICO 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8729849                         PUBLICATION DATE:  05/20/2004
Name:       BAYOU CHICO                                       
            FL
NOAA Chart: 11383                           Latitude:   30° 24.1' N (  30.40170)
USGS Quad:  WEST PENSACOLA                  Longitude:  87° 15.1' W ( -87.25170)


To reach the tidal bench marks from the intersection of Pace Boulevard (State
Route 292) and West Garden Street (U.S. Highway 98 Business) in Pensacola,
proceed south for 2.1 km (1.3 mi) on Pace Boulevard to the junction  of Wels
Lane, then turn right and proceed west on Wels Road for 0.6 km (0.4 mi) to
Audusson Avenue, then turn right and proceed NE on Audusson Avenue for 0.2 km
(0.1 mi) to Recho Bell Marine Service on Bayou Chico.  The bench marks are on
the Recho Bell Marine Service property and near the WCOA Radio Station.  The
tide gage and staff were located on the easternmost dock at Recho Bell Marine
Service.


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


                 PRIMARY BENCH MARK STAMPING:  9849 A 1977
                         DESIGNATION:          872 9849 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10273
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG3653
SETTING CLASSIFICATION:  Concrete retaining wall               OPUS PID:        
LATITUDE:   30° 24.1' N (  30.40170)          LONGITUDE:  87° 15.1' W ( -87.25170)


The primary bench mark is a disk set in top of the concrete retaining wall along
the NE property line of the Recho Bell Marine Service, 21 m (70 ft) NE of the
north corner of Mr. Recho Bell's residence, 17.83 m (58.5 ft) SE of the NW end
of the wall at the water's edge, and 1 m  (2 ft) NW of the SE end of the wall.

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

                                                                                
Station ID: 8729849                         PUBLICATION DATE:  05/20/2004
Name:       BAYOU CHICO                                       
            FL
NOAA Chart: 11383                           Latitude:   30° 24.1' N (  30.40170)
USGS Quad:  WEST PENSACOLA                  Longitude:  87° 15.1' W ( -87.25170)


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


                         BENCH MARK STAMPING:  9849 B 1977
                         DESIGNATION:          872 9849 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10274
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG3652
SETTING CLASSIFICATION:  Copper clad steel rod                 OPUS PID:        
LATITUDE:   30° 24.0' N (  30.40000)          LONGITUDE:  87° 15.2' W ( -87.25330)


The bench mark is a disk located near the junction of Audusson Avenue and
Lakewood Road, 14 m (47 ft) WSW of the west corner of the house at #3 Audusson
Avenue, 9 m (31 ft) SE of the centerline of Audusson Avenue, 8 m (27 ft) NE of
the centerline of Lakewood Road, and 1.0 m (3.4 ft) SE of powerline pole with a
witness sign.  The bench mark is set 12 cm (0.4 ft) below ground level, crimped
to the top of a copper-clad steel rod driven 12.2 m (40 ft), and encased in a
PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  9849 C 1977
                         DESIGNATION:          872 9849 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10275
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG3649
SETTING CLASSIFICATION:  Copper clad steel rod                 OPUS PID:        
LATITUDE:   30° 24.0' N (  30.40000)          LONGITUDE:  87° 15.2' W ( -87.25330)


The bench mark is a disk located SE of the dirt drive leading SW from Lakewood
Road to the WCOA broadcast towers, 34 m (110 ft) east of the east corner of the
WCOA Radio Station broadcast building, 13 m (43 ft) SW of the centerline of
Lakewood Road, 1.07 m (3.5 ft) west of a powerline pole, and 0.3 m (1 ft) NW of
a witness post.  The bench mark is set 0.1 m (0.3 ft) below ground level,
crimped to the top of a copper-clad 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  3 of  5

                                                                                
Station ID: 8729849                         PUBLICATION DATE:  05/20/2004
Name:       BAYOU CHICO                                       
            FL
NOAA Chart: 11383                           Latitude:   30° 24.1' N (  30.40170)
USGS Quad:  WEST PENSACOLA                  Longitude:  87° 15.1' W ( -87.25170)


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


                         BENCH MARK STAMPING:  9849 D 1977
                         DESIGNATION:          872 9849 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10276
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG3651
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID:        
LATITUDE:   30° 24.0' N (  30.40000)          LONGITUDE:  87° 15.2' W ( -87.25330)


The bench mark is a disk set in top of the concrete footing of a storage
building behind the WCOA Radio Station, 50.44 m (165.5 ft) SW of the centerline
of Lakewood Road, 8.32 m (27.3 ft) SW of the west corner of the WCOA Broadcast
Building, 0.55 m (1.8 ft) east of the NW corner of the storage building, and is
beneath the roof eave of the storage building.  NOTE: Mark not found in 1997 by
US Power Squadron.



                         BENCH MARK STAMPING:  9849 E 1977
                         DESIGNATION:          872 9849 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10277
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG3650
SETTING CLASSIFICATION:  Radio tower foundation                OPUS PID:        
LATITUDE:   30° 23.9' N (  30.39830)          LONGITUDE:  87° 15.2' W ( -87.25330)


The bench mark is a disk set in top of the SW corner of the foundation for a
radio tower (tower now is gone), 110 m (361 ft) south of the south corner of the
WCOA broadcast building, and 0.3 m (1 ft) SW of a witness post.  NOTE: Mark not
found in 1997 by US Power Squadron.

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

                                                                                
Station ID: 8729849                         PUBLICATION DATE:  05/20/2004
Name:       BAYOU CHICO                                       
            FL
NOAA Chart: 11383                           Latitude:   30° 24.1' N (  30.40170)
USGS Quad:  WEST PENSACOLA                  Longitude:  87° 15.1' W ( -87.25170)


                            T I D A L   D A T U M S 


Tidal datums at BAYOU CHICO based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           March 1977 - May 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   =  0.376
     MEAN HIGH WATER                            MHW    =  0.366
     MEAN TIDE LEVEL                            MTL    =  0.190
     MEAN SEA LEVEL                             MSL    =  0.182
     North American Vertical Datum              NAVD88 =  0.080
     MEAN LOW WATER                             MLW    =  0.014
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9849 A 1977                                 3.679    3.313
     9849 B 1977                                 5.898    5.532
     9849 C 1977                                 6.685    6.319
     9849 D 1977                                 6.905    6.539
     9849 E 1977                                 7.597    7.231


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

                                                                                
Station ID: 8729849                         PUBLICATION DATE:  05/20/2004
Name:       BAYOU CHICO                                       
            FL
NOAA Chart: 11383                           Latitude:   30° 24.1' N (  30.40170)
USGS Quad:  WEST PENSACOLA                  Longitude:  87° 15.1' W ( -87.25170)


                             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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