Bench Mark Sheet for 8745557, Gulfport Harbor 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8745557                         PUBLICATION DATE:  09/03/2015
Name:       GULFPORT HARBOR, MISSISSIPPI SOUND                
            MS
NOAA Chart: 11372                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  GULFPORT SOUTH                  Longitude:  89°  4.9' W ( -89.08170)


To reach the tidal bench marks from the intersection of 20th Avenue and U.S.
Highway 90 in Gulfport, proceed south on 20th Avenue for 0.6 km (0.4 mi) to the
foot of a jetty leading to the SE.  Proceed by foot along the jetty for 305 m
(1000 ft) to the John C. Moses Fishing Pier.  The bench marks are north of the
Moses Pier along 20th Avenue.  The tide gage and staff were on the east side of
the pier.  The station is located at the small craft harbor of Gulfport,
Mississippi on a public pier on the east side of the breakwater.


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


                 PRIMARY BENCH MARK STAMPING:  5557 C 1979
                         DESIGNATION:          874 5557 C

MONUMENTATION:           Bench Mark disk                       VM#:        10382
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Surrounded by a mass of concrete      OPUS PID:        
LATITUDE:   30° 22.0' N (  30.36606)          LONGITUDE:  89°  5.2' W ( -89.08628)


The primary bench mark is a disk located the Coast Guard station at Gulf Port
Harbor, 66.0 m (216.5 ft) NW of bench mark NO 3 1969, 32.0 m (105.0 ft) NE of a
flag pole in front of the old Coast Guard Station, 26.0 m (85.3 ft) west of a
concrete sea wall along the east shore, 1.13 m (3.71 ft) north of the south curb
of a median with rose garden in front of the station, and 0.91 m (2.98 ft), SW
of a palm tree in said median.  The bench mark is set 0.09 m (0.29 ft) below
ground level, crimped to the top of a stainless steel rod driven 15.2 m (49.9
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: 8745557                         PUBLICATION DATE:  09/03/2015
Name:       GULFPORT HARBOR, MISSISSIPPI SOUND                
            MS
NOAA Chart: 11372                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  GULFPORT SOUTH                  Longitude:  89°  4.9' W ( -89.08170)


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


                         BENCH MARK STAMPING:  NO 1 1969
                         DESIGNATION:          874 5557 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:        10377
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BH0867
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID:        
LATITUDE:   30° 21.9' N (  30.36450)          LONGITUDE:  89°  5.2' W ( -89.08614)


The bench mark is a disk set in the top of the concrete sea wall along a street
on the east side of the City of Gulfport Marina, 39.93 m (131.00 ft) SW and
across the street from bench mark NO 2 1969, 5.03 m (16.50 ft) west of the
center line of 20th Avenue, 2.44 m (8.01 ft) south of the south side of the
entrance to pier, 0.79 m (2.59 ft) below the top of a retaining wall on the top
of the sea wall, and about 15 cm (0.49 ft) ablove the level of the street.



                         BENCH MARK STAMPING:  NO 2 1969
                         DESIGNATION:          874 5557 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:        10378
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BH0865
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID#: BH0865
LATITUDE:   30° 21.9' N (  30.36450)          LONGITUDE:  89°  5.2' W ( -89.08600)


The bench mark is a disk set in the top of a concrete sea wall along a street on
the east side of the City of Gulfport Marina, 74.49 m (244.39 ft) south of bench
mark NO. 3 1969, 39.93 m (131.00 ft) NE and across the street from bench mark
NO. 1 1969, 37 m (121.4 ft) NE and across the street from the center of the
entrance to pier, 6.25 m (20.51 ft) east of the center line of 20th Avenue, and
about 15 cm (0.49 ft) above the level of the street.

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

                                                                                
Station ID: 8745557                         PUBLICATION DATE:  09/03/2015
Name:       GULFPORT HARBOR, MISSISSIPPI SOUND                
            MS
NOAA Chart: 11372                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  GULFPORT SOUTH                  Longitude:  89°  4.9' W ( -89.08170)


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


                         BENCH MARK STAMPING:  NO 3 1969
                         DESIGNATION:          874 5557 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:        10379
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BH0864
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID:        
LATITUDE:   30° 21.9' N (  30.36550)          LONGITUDE:  89°  5.2' W ( -89.08600)


The bench mark is a disk set in the top of a concrete sea wall along a street on
the east side of the City of Gulfport Marina, 0.32 km (0.20 mi) south along the
street on the east side of the City of Gulfport Marina from the junction of 20th
Street and U.S. Highway 90 at Gulfport, 74.49 m (244.39 ft) north of bench mark
NO. 2 1969, 22.77 m (74.705 ft) SE and across the street from the north end of
the sea wall, 6.25 m (20.51 ft) east of the center line of 20th Avenue, and
about 15 cm (0.49 ft) above the level of the street.



                         BENCH MARK STAMPING:  MS-09B/98
                         DESIGNATION:          874 5557 MS-09B

MONUMENTATION:           Tidal Station disk                    VM#:        18259
AGENCY:                  US Army Corps of Engineers (COE)      IDB PID#:        
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   30° 22.0' N (  30.36636)          LONGITUDE:  89°  5.2' W ( -89.08600)


The bench mark is a disk set in the top of the concrete sea wall along a street
on the east side of the City of Gulfport Marina, 0.2 km (0.10 mi) south along
the street on the east side of the City of Gulfport Marina from the junction of
20th Street and US Highway 90 at Gulfport, 103.6 m (339.9 ft) north of the bench
mark NO. 3 1969, 4.57 m (14.99 ft) east from the centerline of 20th Avenue, 15.6
m (51.2 ft) SW from a fire hydrant, and about 0.15 m (0.49 ft) above the level
of the street.

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

                                                                                
Station ID: 8745557                         PUBLICATION DATE:  09/03/2015
Name:       GULFPORT HARBOR, MISSISSIPPI SOUND                
            MS
NOAA Chart: 11372                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  GULFPORT SOUTH                  Longitude:  89°  4.9' W ( -89.08170)


                            T I D A L   D A T U M S 


Tidal datums at GULFPORT HARBOR, MISSISSIPPI SOUND based on:

     LENGTH OF SERIES:      4 YEARS
     TIME PERIOD:           Jan 2006 - Dec 2007 and Jan 2009 - Dec 2010
     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:

     HIGHEST OBSERVED WATER LEVEL (11/10/2009)         =  1.428
     MEAN HIGHER HIGH WATER                     MHHW   =  0.527
     MEAN HIGH WATER                            MHW    =  0.499
     MEAN SEA LEVEL                             MSL    =  0.267
     MEAN TIDE LEVEL                            MTL    =  0.265
     North American Vertical Datum              NAVD88 =  0.227
     MEAN LOW WATER                             MLW    =  0.030
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/14/2006)         = -0.839

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     5557 C 1979                                 2.213    1.714
     NO 1 1969                                   2.500    2.001
     NO 2 1969                                   2.238    1.739
     NO 3 1969                                   2.231    1.732
     MS-09B/98                                   2.258    1.759


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

                                                                                
Station ID: 8745557                         PUBLICATION DATE:  09/03/2015
Name:       GULFPORT HARBOR, MISSISSIPPI SOUND                
            MS
NOAA Chart: 11372                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  GULFPORT SOUTH                  Longitude:  89°  4.9' W ( -89.08170)


                             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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