Bench Mark Sheet for 8742947, EASTERN OLD FORT BAYOU MS

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8742947                         PUBLICATION DATE:  04/21/2003
Name:       EASTERN OLD FORT BAYOU                            
            MS
NOAA Chart: NA                              Latitude:   30° 26.3' N (  30.43830)
USGS Quad:  PASCAGOULA                      Longitude:  88° 43.8' W ( -88.73000)


To reach the tidal bench marks from the intersection of U.S. Highway 90 and
Ocean Springs Road to a dirt drive on the north side of the road, proceed 152 m
(500 ft) north on the dirt drive to the Broussard residence on Old Fort Bayou. 
The bench marks are located in the vicinity of the Broussard residence and Ocean
Springs Road.  The tide gage and staff were located on the north end of the
Broussard's residence private pier. 


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


                 PRIMARY BENCH MARK STAMPING:  2947 A 1979
                         DESIGNATION:          874 2947 A

MONUMENTATION:           Tidal Station disk                    VM#:        11453
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 26.4' N (  30.44000)          LONGITUDE:  88° 43.6' W ( -88.72670)


The primary bench mark is a disk located near the shore of Old Fort Bayou, 17.80
m (58.4 ft) NE of the NE corner of a garage/workshop, 16.89 m (55.4 ft) west of
the NE corner of the Broussard residence, 4.90 m (16.1 ft) NW of the NW corner
of the residence, 4.05 m (13.3 ft) south of the bulkhead on Old Fort Bayou, and
2.90 m (9.5 ft) SW of a 0.91 m (3.0 ft) diameter oak tree.  The bench mark is 9
cm (0.3 ft) below ground level, crimped to a stainless steel rod driven 18.3 m
(60 ft) to substantial resistance, and encased in a 4-inch PVC pipe and concrete
kickblock.

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

                                                                                
Station ID: 8742947                         PUBLICATION DATE:  04/21/2003
Name:       EASTERN OLD FORT BAYOU                            
            MS
NOAA Chart: NA                              Latitude:   30° 26.3' N (  30.43830)
USGS Quad:  PASCAGOULA                      Longitude:  88° 43.8' W ( -88.73000)


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


                         BENCH MARK STAMPING:  2947 B 1979
                         DESIGNATION:          874 2947 B

MONUMENTATION:           Tidal Station disk                    VM#:        11454
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete post                         OPUS PID:        
LATITUDE:   30° 26.4' N (  30.44000)          LONGITUDE:  88° 43.6' W ( -88.72670)


The bench mark is a disk set flush in a concrete post along the west side of the
dirt drive to the Broussard residence, 64.31 m (211.0 ft) south of bench mark
2947 A 1979, 49.14 m (161.2 ft) north of the centerline of Ocean Springs Road,
14 m (46 ft) NW of a 0.46 m (1.5 ft) diameter oak tree, 10.64 m (34.9 ft) east
of a 0.46 m (1.5 ft) diameter palm tree, and 4 m (12 ft) west of the centerline
of the driveway.



                         BENCH MARK STAMPING:  2947 C 1979
                         DESIGNATION:          874 2947 C

MONUMENTATION:           Tidal Station disk                    VM#:        11455
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete post                         OPUS PID:        
LATITUDE:   30° 26.4' N (  30.44000)          LONGITUDE:  88° 43.6' W ( -88.72670)


The bench mark is a disk set flush in a concrete post, on the north side of
Ocean Springs Road, 76 m (249 ft) NE of the centerline of the dirt drive to the
Broussard residence, 71 m (233 ft) east of bench mark 2947 B 1979, 18.41 m (60.4
ft) NE of a telephone junction box, 11 m (36 ft) NW of the centerline of Ocean
Springs Road, and 2.41 m (7.9 ft) NW of power pole #B-163 SPC-906-40.

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

                                                                                
Station ID: 8742947                         PUBLICATION DATE:  04/21/2003
Name:       EASTERN OLD FORT BAYOU                            
            MS
NOAA Chart: NA                              Latitude:   30° 26.3' N (  30.43830)
USGS Quad:  PASCAGOULA                      Longitude:  88° 43.8' W ( -88.73000)


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


                         BENCH MARK STAMPING:  2947 D 1979
                         DESIGNATION:          874 2947 D

MONUMENTATION:           Tidal Station disk                    VM#:        11456
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 26.4' N (  30.44000)          LONGITUDE:  88° 43.6' W ( -88.72670)


The bench mark is a disk located 124 m (407 ft) west of bench mark 2947 C 1979,
69 m (226 ft) ENE of the centerline of the Danley driveway, 48 m (157 ft) WSW of
the centerline of the Broussard driveway, 12.31 m (40.4 ft) WSW of power pole
#52, and 9.57 m (31.4 ft) NW of the centerline of Ocean Springs Road.  The bench
mark is 12 cm (0.4 ft) below ground level, crimped to a stainless steel rod
driven 16.8 m (55 ft) to substantial resistance, and encased in a 4-inch PVC
pipe and concrete kickblock.

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

                                                                                
Station ID: 8742947                         PUBLICATION DATE:  04/21/2003
Name:       EASTERN OLD FORT BAYOU                            
            MS
NOAA Chart: NA                              Latitude:   30° 26.3' N (  30.43830)
USGS Quad:  PASCAGOULA                      Longitude:  88° 43.8' W ( -88.73000)


                            T I D A L   D A T U M S 


Tidal datums at EASTERN OLD FORT BAYOU based on:

     LENGTH OF SERIES:      3 Months
     TIME PERIOD:           February 1980 - April 1980
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8743735 BILOXI (CADET POINT), BILOXI BAY


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     MEAN HIGHER HIGH WATER                     MHHW   =  0.627
     MEAN HIGH WATER                            MHW    =  0.537
     MEAN SEA LEVEL                             MSL    =  0.329
     MEAN TIDE LEVEL                            MTL    =  0.311
     MEAN LOW WATER                             MLW    =  0.085
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2947 A 1979                                 1.459    0.922
     2947 B 1979                                 2.319    1.782
     2947 C 1979                                 2.033    1.496
     2947 D 1979                                 2.205    1.668


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

                                                                                
Station ID: 8742947                         PUBLICATION DATE:  04/21/2003
Name:       EASTERN OLD FORT BAYOU                            
            MS
NOAA Chart: NA                              Latitude:   30° 26.3' N (  30.43830)
USGS Quad:  PASCAGOULA                      Longitude:  88° 43.8' W ( -88.73000)


                             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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