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Bench Mark Sheet for 8770613, Morgans Point, Barbours Cut TX

Superseded Epoch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Small blue map location marker Unpublished bench mark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  7

                                                                                
Station ID: 8770613                         PUBLICATION DATE:  07/17/2013
Name:       MORGANS POINT, BARBOURS CUT                       
            TX
NOAA Chart: 11328                           Latitude:   29° 40.9' N (  29.68170)
USGS Quad:  TEXAS CITY                      Longitude:  94° 59.1' W ( -94.98500)


To reach the tidal bench marks from the intersection of Texas State Highway 146
and W. Barbours Cut Boulevard in La Porte, proceed east on W. Barbours Cut
Boulevard for approximately 0.8 km (0.5 mi) to the point where W. Barbours Cut
Boulevard becomes E. Barbours Cut Boulevard, then continue east on E. Barbours
Cut Boulevard for 3.2 km (2.0 mi) to the Port of Houston Authority entrance
gates, then continue through the gates and bear left, crossing the railroad
tracks, and then proceed to the U-shaped concrete dock on the ship channel.  The
bench marks are located in the vicinity of the Port of Houston Authority
property.  The tide gage and staff are located on a small wooden dock on the
east side of the concrete dock.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8770613                         PUBLICATION DATE:  07/17/2013
Name:       MORGANS POINT, BARBOURS CUT                       
            TX
NOAA Chart: 11328                           Latitude:   29° 40.9' N (  29.68170)
USGS Quad:  TEXAS CITY                      Longitude:  94° 59.1' W ( -94.98500)


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


                 PRIMARY BENCH MARK STAMPING:  E 1201 1973
                         DESIGNATION:          E 1201

MONUMENTATION:           Bench Mark disk                       VM#:        11218
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  AW1556
SETTING CLASSIFICATION:  Concrete bridge abutment              OPUS PID:        
LATITUDE:   29° 40.9' N (  29.68133)          LONGITUDE:  94° 59.1' W ( -94.98539)


The primary bench mark is a disk set in top of the east end of the south
concrete abutment of the most westerly bridge of the Houston Port Authority
Container Terminal Dock, 84 m (276 ft) NW of the centerline of Morgans Point-La
Porte Road, 0.37 m (1.2 ft) east of the SE corner of a concrete walkway, and 0.3
m (1 ft) above the bridge floor.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8770613                         PUBLICATION DATE:  07/17/2013
Name:       MORGANS POINT, BARBOURS CUT                       
            TX
NOAA Chart: 11328                           Latitude:   29° 40.9' N (  29.68170)
USGS Quad:  TEXAS CITY                      Longitude:  94° 59.1' W ( -94.98500)


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


                         BENCH MARK STAMPING:  MORGAN PT 3 NO 3 1973
                         DESIGNATION:          MORGAN PT 3 RM 3

MONUMENTATION:           Reference Mark disk                   VM#:        11214
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  AW1554
SETTING CLASSIFICATION:  Curb                                  OPUS PID:        
LATITUDE:   29° 40.9' N (  29.68142)          LONGITUDE:  94° 59.1' W ( -94.98542)


The bench mark is a disk set on the top center of the east curb of the west
bridge to the Houston Port Authority Container Terminal Dock at Morgans Point,
10.88 m (35.7 ft) NE of Bench Mark MORGAN POINT 3 USE, and 9.91 m (32.5 ft)
north of the entrance to the west bridge of the dock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8770613                         PUBLICATION DATE:  07/17/2013
Name:       MORGANS POINT, BARBOURS CUT                       
            TX
NOAA Chart: 11328                           Latitude:   29° 40.9' N (  29.68170)
USGS Quad:  TEXAS CITY                      Longitude:  94° 59.1' W ( -94.98500)


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


                         BENCH MARK STAMPING:  MORGAN PT 3 USE 1973
                         DESIGNATION:          MORGAN PT 3

MONUMENTATION:           Triangulation Station disk            VM#:        11215
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  AW1555
SETTING CLASSIFICATION:  Head wall                             OPUS PID:        
LATITUDE:   29° 40.9' N (  29.68131)          LONGITUDE:  94° 59.1' W ( -94.98544)


The bench mark is a disk set in the south end of the west wing of the head wall
of the west bridge to the Houston Port Authority Container Terminal Dock, and 1
m (2 ft) higher than the ramp leading to the dock.



                         BENCH MARK STAMPING:  0613 H 2004
                         DESIGNATION:          877 0613 H TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        17724
AGENCY:                  Division of Nearshore Research        IDB PID#:  BBGD01
SETTING CLASSIFICATION:  Pier                                  OPUS PID:        
LATITUDE:   29° 40.9' N (  29.68144)          LONGITUDE:  94° 59.1' W ( -94.98461)


The mark is a disk set in the top of the west end cap of the u-shaped pier at
the East end of Barbour's Cut, next to the Port of Houston Authority Fire Boat,
44.5 m (146.0 ft) NE of the center of a propane tank, 35.4 m (116.1 ft) north of
the eastermost side of a gas pump, and 2.2 m (7.2 ft) west of the centerline of
the eastside of the road leading to the u-shaped pier.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8770613                         PUBLICATION DATE:  07/17/2013
Name:       MORGANS POINT, BARBOURS CUT                       
            TX
NOAA Chart: 11328                           Latitude:   29° 40.9' N (  29.68170)
USGS Quad:  TEXAS CITY                      Longitude:  94° 59.1' W ( -94.98500)


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


                         BENCH MARK STAMPING:  0613 J 2004
                         DESIGNATION:          877 0613 J TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        17725
AGENCY:                  Division of Nearshore Research        IDB PID#:  DO9986
SETTING CLASSIFICATION:  Concrete Slab                         OPUS PID#: DO9986
LATITUDE:   29° 40.9' N (  29.68170)          LONGITUDE:  94° 59.0' W ( -94.98330)


The benchmark is a disk set into the west side of the concrete slab supporting a
propane tank, 29.3 m (96.1 ft) NE of a light post with three transformers on
top, 16.1 m (52.8 ft) NW of the NW corner of the concrete containment wall of a
large diesel fuel tank, and 3.8 m (12.5 ft ) west of the center of the propane
tank.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8770613                         PUBLICATION DATE:  07/17/2013
Name:       MORGANS POINT, BARBOURS CUT                       
            TX
NOAA Chart: 11328                           Latitude:   29° 40.9' N (  29.68170)
USGS Quad:  TEXAS CITY                      Longitude:  94° 59.1' W ( -94.98500)


                            T I D A L   D A T U M S 


Tidal datums at MORGANS POINT, BARBOURS CUT based on:

     LENGTH OF SERIES:      16 YEARS
     TIME PERIOD:           April 1997 - March 2013
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8771450 GALVESTON PIER 21, GALVESTON CHANNEL


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

     HIGHEST OBSERVED WATER LEVEL (09/12/2008)         =  1.991
     MEAN HIGHER HIGH WATER                     MHHW   =  0.399
     MEAN HIGH WATER                            MHW    =  0.377
     MEAN SEA LEVEL                             MSL    =  0.217
     MEAN TIDE LEVEL                            MTL    =  0.206
     MEAN LOW WATER                             MLW    =  0.035
     North American Vertical Datum              NAVD88 =  0.031
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/19/1996)         = -1.024

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     E 1201 1973                                 4.395    4.018
     MORGAN PT 3 NO 3 1973                       4.412    4.035
     MORGAN PT 3 USE 1973                        4.403    4.026
     0613 H 2004                                 4.348    3.971
     0613 J 2004                                 5.305    4.928


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  7

                                                                                
Station ID: 8770613                         PUBLICATION DATE:  07/17/2013
Name:       MORGANS POINT, BARBOURS CUT                       
            TX
NOAA Chart: 11328                           Latitude:   29° 40.9' N (  29.68170)
USGS Quad:  TEXAS CITY                      Longitude:  94° 59.1' W ( -94.98500)


                             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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Products available at 8770613 Morgans Point, Barbours Cut, TX

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