Bench Mark Sheet for 8740405, PETIT BOIS ISLAND, MISS. SOUND 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8740405                         PUBLICATION DATE:  07/12/2012
Name:       PETIT BOIS ISLAND, MISS. SOUND                    
            MS
NOAA Chart: 11373                           Latitude:   30° 12.2' N (  30.20330)
USGS Quad:  PETIT BOIS ISLAND               Longitude:  88° 26.5' W ( -88.44170)


To reach the tidal bench marks from the intersection of U.S. Highway 90 and
Market Street in Pascagoula, proceed 2.9 km (1.8 mi) south on Market Street to
Beach Boulevard, then 1.6 km (1.0 mi) west on Beach Boulevard to the public
launching facilities.  Proceed by boat out the eastern channel of the harbor and
continue on a 140  magnetic (SE) course for 20 km (11 nm) to Petit Bois Island. 
The bench marks are located west of the gage site along the north shore of the
island.  The tide gage and staff were located on a three pile structure
approximately 46 m (150 ft) offshore on the north side of the island, and 244 m
(800 ft) east of a tidal creek running orth-south.


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


                 PRIMARY BENCH MARK STAMPING:  0405 A 1980
                         DESIGNATION:          874 0405 A 1980

MONUMENTATION:           Survey disk                           VM#:        11400
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   30° 12.2' N (  30.20330)          LONGITUDE:  88° 26.0' W ( -88.43333)


The primary bench mark is a disk nearly directly inshore from the tide gage
platform, 84 m (277 ft) west of a 1.83 m (6.0 ft) D.B.H. bayberry bush, 30 m
(100 ft) south of the north shoreline of the island, and 18 m (60 ft) north of
the NE end of a pond.  The bench mark is set 0.06 m (0.2 ft) below ground level,
crimped to a steel rod driven 17 m (55 ft) to refusal 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: 8740405                         PUBLICATION DATE:  07/12/2012
Name:       PETIT BOIS ISLAND, MISS. SOUND                    
            MS
NOAA Chart: 11373                           Latitude:   30° 12.2' N (  30.20330)
USGS Quad:  PETIT BOIS ISLAND               Longitude:  88° 26.5' W ( -88.44170)


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


                         BENCH MARK STAMPING:  0405 B 1980
                         DESIGNATION:          874 0405 B 1980

MONUMENTATION:           Survey disk                           VM#:        11401
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   30° 12.2' N (  30.20330)          LONGITUDE:  88° 26.0' W ( -88.43333)


The bench mark is a disk 66 m (215 ft) WSW of bench mark 0405 A 1980, 34 m (112
ft) SSE of the north shoreline of the island in line with a refinery on the
mainland, and 15 m (48 ft) north of a pond.  The bench mark is set 0.06 m (0.2
ft) below ground level, crimped to a steel rod driven 17 m (55 ft) to refusal
and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  0405 C 1980
                         DESIGNATION:          874 0405 C 1980

MONUMENTATION:           Survey disk                           VM#:        11402
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   30° 12.2' N (  30.20330)          LONGITUDE:  88° 26.0' W ( -88.43333)


The bench mark is a disk 63 m (208 ft) WSW of bench mark 0405 B 1980, 35 m (114
ft) south of the north shoreline of the island, 26 m (85 ft) north of a pond,
and 17 m (56 ft) NE of a lone fence post.  The bench mark is set 0.06 m (0.2 ft)
below ground level, crimped to a steel rod driven 17 m (55 ft) to refusal 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  3 of  5

                                                                                
Station ID: 8740405                         PUBLICATION DATE:  07/12/2012
Name:       PETIT BOIS ISLAND, MISS. SOUND                    
            MS
NOAA Chart: 11373                           Latitude:   30° 12.2' N (  30.20330)
USGS Quad:  PETIT BOIS ISLAND               Longitude:  88° 26.5' W ( -88.44170)


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


                         BENCH MARK STAMPING:  0405 D 1980
                         DESIGNATION:          874 0405 D 1980

MONUMENTATION:           Survey disk                           VM#:        11403
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   30° 12.2' N (  30.20330)          LONGITUDE:  88° 26.0' W ( -88.43333)


The bench mark is a disk 67 m (220 ft) WSW of bench mark 0405 C 1980, 23 m (77
ft) NE of bayberry bushes, and 18 m (58 ft) SE of the north shoreline of Petit
Bois Island in line with Round Island.  The bench mark is set 0.06 m (0.2 ft)
below ground level, crimped to a steel rod driven 17 m (55 ft) to refusal and
encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  GARY 1958
                         DESIGNATION:          874 0405 GARY 1958

MONUMENTATION:           Survey disk                           VM#:        11404
AGENCY:                                                        IDB PID#:        
SETTING CLASSIFICATION:  Set in pipe with concrete base        OPUS PID:        
LATITUDE:   30° 12.2' N (  30.20330)          LONGITUDE:  88° 26.0' W ( -88.43333)


The bench mark is a disk set in top of a pipe with a concrete base, 96 m (316
ft) WSW of bench mark 0405 D 1980, 37 m (120 ft) west of the center of a 3 m (10
ft) wide tidal creek running north-south, and 18 m (59 ft) south of the north
shoreline of the island in line with the refinery at Pascagoula.

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

                                                                                
Station ID: 8740405                         PUBLICATION DATE:  07/12/2012
Name:       PETIT BOIS ISLAND, MISS. SOUND                    
            MS
NOAA Chart: 11373                           Latitude:   30° 12.2' N (  30.20330)
USGS Quad:  PETIT BOIS ISLAND               Longitude:  88° 26.5' W ( -88.44170)


                            T I D A L   D A T U M S 


Tidal datums at PETIT BOIS ISLAND, MISS. SOUND based on:

     LENGTH OF SERIES:      7 MONTHS
     TIME PERIOD:           April 1980 - October 1980
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8735180 DAUPHIN ISLAND, MOBILE BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.447
     MEAN HIGH WATER                            MHW    =  0.430
     MEAN TIDE LEVEL                            MTL    =  0.222
     MEAN SEA LEVEL                             MSL    =  0.216
     MEAN LOW WATER                             MLW    =  0.015
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     0405 A 1980                                 0.886    0.456
     0405 B 1980                                 0.764    0.334
     0405 C 1980                                 0.854    0.424
     0405 D 1980                                 0.477    0.047
     GARY 1958                                   1.976    1.546


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

                                                                                
Station ID: 8740405                         PUBLICATION DATE:  07/12/2012
Name:       PETIT BOIS ISLAND, MISS. SOUND                    
            MS
NOAA Chart: 11373                           Latitude:   30° 12.2' N (  30.20330)
USGS Quad:  PETIT BOIS ISLAND               Longitude:  88° 26.5' W ( -88.44170)


                             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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