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Bench Mark Sheet for 8737048, Mobile State Docks AL

Superseded Epoch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Small blue map location marker Unpublished bench mark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  8

                                                                                
Station ID: 8737048                                PUBLICATION DATE:  01/11/2013
Name:       MOBILE STATE DOCKS, MOBILE RIVER                  
            AL
NOAA Chart: 11376                                  Latitude:         30° 42.5' N
USGS Quad:  MOBILE                                 Longitude:        88°  2.6' W


To reach the tidal bench marks from the Water Street (State Route 43) exit on
Interstate Highway 10 in Mobile, proceed north on Water Street for 2.3 km (1.4
mi) to Beauregard Street, then east on Beauregard Street for 0.3 km (0.2 mi) to
Delchamps Street, then north on Delchamps Street for 0.3 km (0.2 mi) to the
Mobile State Docks security office.  The bench marks are on the Mobile State
Docks facility.  The tide gage and staff were at the east end of Pier A South
(just south of bench mark 7048 A 1980).


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


                 PRIMARY BENCH MARK STAMPING:  7048 C 2002
                         DESIGNATION:          873 7048 C

MONUMENTATION:           Tidal Station disk                        VM#:    16645
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Massive concrete ramp


The primary bench mark is a disk set flush in the concrete, located on a loading
ramp between Pier A South and Berth 8, 25.66 m (84.19 ft) north of a yellow
bollard on the loading ramp, 5.18 m (16.99 ft) south of the south rail of the
railroad tracks, 1.9 m (6.2 ft) west of the east edge of the bulkhead, and 0.80
m (2.62 ft) below the concrete ledge of the retaining wall with a metal railing.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  8

                                                                                
Station ID: 8737048                                PUBLICATION DATE:  01/11/2013
Name:       MOBILE STATE DOCKS, MOBILE RIVER                  
            AL
NOAA Chart: 11376                                  Latitude:         30° 42.5' N
USGS Quad:  MOBILE                                 Longitude:        88°  2.6' W


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


                         BENCH MARK STAMPING:  Y 9 RESET 1946
                         DESIGNATION:          Y 9 RESET

MONUMENTATION:           Survey disk                               VM#:    10358
AGENCY:                  US Coast and Geodetic Survey (US&CGS)     PID#:  BH0056
SETTING CLASSIFICATION:  Building


The bench mark is a disk set vertically in the south brick face of the third
column east of St. Joseph Street, on the south side of the Gulf Mobile & Ohio
Company building at the NE corner of the intersectin of St. Joseph and
Beauregard Streets, 12.0 m (39.4 ft) north of the west end of a sign, 9.4 m
(30.8 ft) east of the east curb of St. Joseph Street, 4.10 m (13.45 ft) east of
the east face of the building, 1.4 m (4.6 ft) above a concrete parking ramp.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 8737048                                PUBLICATION DATE:  01/11/2013
Name:       MOBILE STATE DOCKS, MOBILE RIVER                  
            AL
NOAA Chart: 11376                                  Latitude:         30° 42.5' N
USGS Quad:  MOBILE                                 Longitude:        88°  2.6' W


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


                         BENCH MARK STAMPING:  N 406 1955
                         DESIGNATION:          N 406

MONUMENTATION:           Bench Mark disk                           VM#:    10359
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  BH1470
SETTING CLASSIFICATION:  Building foundation


The bench mark is a disk set vertically in the north face of the U.S. Court
House and Custom House building, 7.0 m (23.0 ft) west of the west curb of St.
Joseph Street, 5 .2 m (17.1 ft) south of the south curb of St. Louis Street,
0.80 m (2.6 ft) west of the NE corner of the building, and 0.3 m (0.98 ft) above
the ground.



                         BENCH MARK STAMPING:  7048 A 1980
                         DESIGNATION:          873 7048 A

MONUMENTATION:           Tidal Station disk                        VM#:    10360
AGENCY:                  National Ocean Survey (NOS)               PID:         
SETTING CLASSIFICATION:  Concrete pier


The bench mark is a disk set flush with the concrete at the east end of Pier A,
below and just south of a metal stairway, 8.5 m (27.9 ft) west of the east dock
wall, 2.43 m (7.97 ft) north of the center of a metal stairways, and 1.50 m
(4.92 ft) south of the south wall of a concrete warehouse.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 8737048                                PUBLICATION DATE:  01/11/2013
Name:       MOBILE STATE DOCKS, MOBILE RIVER                  
            AL
NOAA Chart: 11376                                  Latitude:         30° 42.5' N
USGS Quad:  MOBILE                                 Longitude:        88°  2.6' W


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


                         BENCH MARK STAMPING:  USGS
                         DESIGNATION:          MERIDIAN STONE USGS

MONUMENTATION:           Boundry marker                            VM#:    10362
AGENCY:                  US Geological Survey (USGS)               PID#:  BH0051
SETTING CLASSIFICATION:  imbedded in the ground


The boundry marker is set in the center of the top of a stone monument in
Bienville Square, 53.9 m (176.8 ft) west of the west curb of St. Joseph Street,
6.7 m (22.0 ft) south of the curb of St. Francis Street, and 0.4 m (1.3 ft)
above the ground.  Note - the letters USGS are cut in top of the monument.



                         BENCH MARK STAMPING:  7048 D 2002
                         DESIGNATION:          873 7048 D
                         ALIAS:                7048 D

MONUMENTATION:           Tidal Station disk                        VM#:    16646
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Concrete ramp


The bench mark is a disk set flush in the concrete, located on the south side of
a loading ramp on the west side of piers between Pier A South and Berth 8,
28.01m (91.90 ft) south of the center of a loading ramp between Pier A South and
Berth 8, 11.40 m (37.40 ft) NW of the WNW corner of a building at Berth 8, 2.0 m
(6.6 ft) west of the bulkhead on the loading ramp, 1.64 m (5.38 ft) below a
concrete wall on the south end of the loading ramp.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 8737048                                PUBLICATION DATE:  01/11/2013
Name:       MOBILE STATE DOCKS, MOBILE RIVER                  
            AL
NOAA Chart: 11376                                  Latitude:         30° 42.5' N
USGS Quad:  MOBILE                                 Longitude:        88°  2.6' W


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


                         BENCH MARK STAMPING:  J 445 1980
                         DESIGNATION:          J 445

MONUMENTATION:           Bench Mark disk                           VM#:    18294
AGENCY:                                                            PID#:  BH1581
SETTING CLASSIFICATION:  Structure


The bench mark is a disk set vertically in the west corner of the post office at
the junction of St. Joseph and Congress Streets, 21.4 m (70.2 ft) NE of the NE
curb of ST. Joseph Street, 5.7 m (18.7 ft) SE of the SE curb of Congress Street,
0.30 m (0.98 ft) NE of the west corner of the post office, and 1.25 m (4.10 ft)
above the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 8737048                                PUBLICATION DATE:  01/11/2013
Name:       MOBILE STATE DOCKS, MOBILE RIVER                  
            AL
NOAA Chart: 11376                                  Latitude:         30° 42.5' N
USGS Quad:  MOBILE                                 Longitude:        88°  2.6' W


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


                         BENCH MARK STAMPING:  MOBILE HARBOR 233 1939
                         DESIGNATION:          USED 233

MONUMENTATION:           Tidal Station disk                        VM#:    18775
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Dock


The bench mark is a disk set flush in the concrete at pier A at the east end of
the dock on the lower part of the dock, 7.28 m (23.88 ft) ENE of BM 7048 A, 4.14
m (13.58 ft) East of the East face of a concrete warehouse wall, 0.43 m (1.411
ft) west of a orange bollard.



                         BENCH MARK STAMPING:  7048 E 2009
                         DESIGNATION:          873 7048 E

MONUMENTATION:           Bench Mark disk                           VM#:    19516
AGENCY:                  Condrad Blucher Institute                 PID:         
SETTING CLASSIFICATION:  Concrete pier


The bench mark is a disk set in a bulkhead, located 11.38 m (37.34 ft) west of
the northern corner of the bulkhead, 5.20 m (17.06 ft) west of the corner of the
orange bollard to the north, 8.76 m (28.74 ft) south of the south corner to the
ladder of the tide gauge, and 11.16 m (36.61 ft) SE of the corner closest to the
garage.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                                                
Station ID: 8737048                                PUBLICATION DATE:  01/11/2013
Name:       MOBILE STATE DOCKS, MOBILE RIVER                  
            AL
NOAA Chart: 11376                                  Latitude:         30° 42.5' N
USGS Quad:  MOBILE                                 Longitude:        88°  2.6' W


                            T I D A L   D A T U M S 


Tidal datums at MOBILE STATE DOCKS, MOBILE RIVER based on:

     LENGTH OF SERIES:      5 YEARS
     TIME PERIOD:           October 2007 - September 2012
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8741533 PASCAGOULA NOAA LAB, PASCAGOULA RIVER


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

     HIGHEST OBSERVED WATER LEVEL (08/29/2012)         =  1.614
     MEAN HIGHER HIGH WATER                     MHHW   =  0.494
     MEAN HIGH WATER                            MHW    =  0.469
     MEAN TIDE LEVEL                            MTL    =  0.248
     MEAN SEA LEVEL                             MSL    =  0.247
     North American Vertical Datum              NAVD88 =  0.144
     MEAN LOW WATER                             MLW    =  0.027
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/02/2008)         = -0.804

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7048 C 2002                                 1.623    1.154
     Y 9 RESET 1946                              3.613    3.144
     N 406 1955                                  3.347    2.878
     7048 A 1980                                 1.684    1.215
     USGS                                        3.761    3.292
     7048 D 2002                                 1.617    1.148
     J 445 1980                                  3.533    3.064
     MOBILE HARBOR 233 1939                      1.654    1.185
     7048 E 2009                                 3.164    2.695


Foot Notes:

Bench marks N 406 1955 and USGS are based on one differential leveling
connection and do not meet the quality control standards of the NOS.  Therefore,
caution should be used when deriving elevations for these marks.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  8

                                                                                
Station ID: 8737048                                PUBLICATION DATE:  01/11/2013
Name:       MOBILE STATE DOCKS, MOBILE RIVER                  
            AL
NOAA Chart: 11376                                  Latitude:         30° 42.5' N
USGS Quad:  MOBILE                                 Longitude:        88°  2.6' W


                             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 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 8737048 Mobile State Docks, AL

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services