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Bench Mark Sheet for 8737138, Chickasaw Creek 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8737138                         PUBLICATION DATE:  04/11/2013
Name:       WILLIAM BROOKS PARK, CHICKASAW CREEK              
            AL
NOAA Chart: 11376                           Latitude:   30° 46.9' N (  30.78189)
USGS Quad:  CHICKASAW                       Longitude:  88°  4.4' W ( -88.07361)


To reach the benchmarks from Chickasaw, AL, proceed north on State RT 43 for 1.9
km (1.2 mi) to the William Brooks Park, south of Chickasaw Creek, AL. The
benchmarks are around the parking lot of the park. The tide gauge and sensor are
located at the north end of Sam Rawsl gazebo.


                         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  8

                                                                                
Station ID: 8737138                         PUBLICATION DATE:  04/11/2013
Name:       WILLIAM BROOKS PARK, CHICKASAW CREEK              
            AL
NOAA Chart: 11376                           Latitude:   30° 46.9' N (  30.78189)
USGS Quad:  CHICKASAW                       Longitude:  88°  4.4' W ( -88.07361)


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


                 PRIMARY BENCH MARK STAMPING:   
                         DESIGNATION:          873 7138 DOT 1
                         ALIAS:                No Stamping DOT 1

MONUMENTATION:           Survey disk                           VM#:        20324
AGENCY:                  Alabama DOT                           IDB PID#:        
SETTING CLASSIFICATION:  Concrete Retaining Wall               OPUS PID:        
LATITUDE:   30° 46.9' N (  30.78189)          LONGITUDE:  88°  4.4' W ( -88.07267)


The primary bench mark is a disk set on top of the SE retaining wall of the R B
Smallwood DR Memorial Bridge, located 1.9 km (1.2 mi) north from the Chickasaw
Post Office, along the north bound of State Route 43, 44.80 m (147.0 ft) NNE
from a lighting pole number 5-123367, 13.30 m (43.65 ft) NNW of a utility pole
number 5-123452, 12.30 m (40.5 ft) from the centerling of State Route 43, and
1.30 m (4.2 ft) north from a sign with legend RB Smallwood Sr Memorial Bridge,
and 0.5 m (1.5 ft ) above the ground.

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

                                                                                
Station ID: 8737138                         PUBLICATION DATE:  04/11/2013
Name:       WILLIAM BROOKS PARK, CHICKASAW CREEK              
            AL
NOAA Chart: 11376                           Latitude:   30° 46.9' N (  30.78189)
USGS Quad:  CHICKASAW                       Longitude:  88°  4.4' W ( -88.07361)


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


                         BENCH MARK STAMPING:  J 367 1951
                         DESIGNATION:          J 367

MONUMENTATION:           Bench Mark disk                       VM#:        20321
AGENCY:                  USC&GS                                IDB PID#:  BH0075
SETTING CLASSIFICATION:  Railroad Bridge Abutment              OPUS PID:        
LATITUDE:   30° 46.9' N (  30.78189)          LONGITUDE:  88°  4.3' W ( -88.07181)


The benchmark is a disk set in top of the first supporting massive concrete
structure of the southern railway bridge at Chickasaw Creek, 1.9 km (1.2 mi)
north of the Chickasaw Post Office, 81.90 m (268.7 ft) SSW of a utility pole
with no number at the north side of the Chickacaw Creek, 78.40 m (257.3 ft) east
from the easternmost fender wall of the R B Smallwood Sr Memorial Bridge along
State Route 43, 31.20 m (102.5 ft) east from the easternmost side of the
northern railway brigde at Chickasaw Creek, 30.10 m (98.6 ft) west from a mayor
water pipe across the Chickasaw Creek, 19.80 m (64.8 ft) north from a sign with
legend extremly dangerous no trespassing, and 3.00 m (9.8 ft) SW of the SW
corner of themetal fender of the southern railways bridge. The bench mark is set
1.5 m (5.0 ft) below the railroad tracks.

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

                                                                                
Station ID: 8737138                         PUBLICATION DATE:  04/11/2013
Name:       WILLIAM BROOKS PARK, CHICKASAW CREEK              
            AL
NOAA Chart: 11376                           Latitude:   30° 46.9' N (  30.78189)
USGS Quad:  CHICKASAW                       Longitude:  88°  4.4' W ( -88.07361)


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


                         BENCH MARK STAMPING:  7138 A 2011
                         DESIGNATION:          873 7138 A

MONUMENTATION:           Flange-encased Rod                    VM#:        20322
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID#: BBCP05
LATITUDE:   30° 46.9' N (  30.78192)          LONGITUDE:  88°  4.4' W ( -88.07350)


The bench mark is a flange-encased rod located 1.9 km (1.2 mi) north from the
Chickasaw Post Office, along State Route 43, and to the William Brooks Park,
43.30 m (142.0 ft) NW of a flag pole, 21.30 m (70.0 ft) WSW from a lighting pole
with a power meter number 5062187, 2.90 m (9.5 ft) NE of the NE corner of the
Sam Rawls gazebo, and 1.70 m (5.5 ft) north of a above ground concrete monument
with legend city of Chickasaw redevelopment of Brooks Park. The datum point is
set flush with the ground, being the top of a stainless steel rod driven 27.4 m
(89.9 ft) to refusal, and encased in a 5-inch (13 cm) PVC pipe with no logo cap.

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

                                                                                
Station ID: 8737138                         PUBLICATION DATE:  04/11/2013
Name:       WILLIAM BROOKS PARK, CHICKASAW CREEK              
            AL
NOAA Chart: 11376                           Latitude:   30° 46.9' N (  30.78189)
USGS Quad:  CHICKASAW                       Longitude:  88°  4.4' W ( -88.07361)


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


                         BENCH MARK STAMPING:  7138 B 2011
                         DESIGNATION:          873 7138 B

MONUMENTATION:           Flange-encased Rod                    VM#:        20323
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   30° 46.9' N (  30.78142)          LONGITUDE:  88°  4.4' W ( -88.07319)


The bench mark is a flange-encase rod located 1.9 km (1.2 mi) north from the
Chickasaw Post Office, along State Route 43, and to the William Brooks Park,
59.40 m (195.0 ft) SE of the SE corner of the Sam Rawls gazebo, 26.50 m (86.8
ft) SW of the lighting pole number 5-123367, 23.10 m (75.8 ft) SSE from the flag
pole, 18.30 m (60.0 ft) north from a no swimming sign at the entrace of the boat
ramp, and 1.20 m (4.0 ft) north of a utility/lighting pole with a transformer
number 16791. The datum point is set flush with the ground, being the top of a
stainless steel rod driven 27.4 m (89.9 ft) to refusal, and encased in a 5-inch
(13 cm) PVC pipe with no logo cap.

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

                                                                                
Station ID: 8737138                         PUBLICATION DATE:  04/11/2013
Name:       WILLIAM BROOKS PARK, CHICKASAW CREEK              
            AL
NOAA Chart: 11376                           Latitude:   30° 46.9' N (  30.78189)
USGS Quad:  CHICKASAW                       Longitude:  88°  4.4' W ( -88.07361)


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


                         BENCH MARK STAMPING:   
                         DESIGNATION:          873 7138 DOT 2
                         ALIAS:                No Stamping DOT 2

MONUMENTATION:           Survey disk                           VM#:        20325
AGENCY:                  Alabama DOT                           IDB PID#:        
SETTING CLASSIFICATION:  Bridge retaining wall                 OPUS PID:        
LATITUDE:   30° 47.0' N (  30.78322)          LONGITUDE:  88°  4.4' W ( -88.07289)


The bench mark is a disk set on top of the NW retaining wall of the R B
Smallwood DR Memorial Bridge, located 2.1 km (1.3 mi) north from the Chickasaw
Post Office, along the south bound of State Route 43,  56.40 m (185.1 ft) south
from a no parking sign, 23.70 m (77.6 ft) SSE from a lighting pole number
5-123364, 12.00 m (39.3 ft) west from the centerline of State Route 43, 6.00 m
(19.7 ft) SE from an utility pole number 5-123365, 0.20 m (0.5 ft) south of the
R B Smallwood Sr Memorial Bridge, and 0.30 m (1.0 ft) above the ground. 

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

                                                                                
Station ID: 8737138                         PUBLICATION DATE:  04/11/2013
Name:       WILLIAM BROOKS PARK, CHICKASAW CREEK              
            AL
NOAA Chart: 11376                           Latitude:   30° 46.9' N (  30.78189)
USGS Quad:  CHICKASAW                       Longitude:  88°  4.4' W ( -88.07361)


                            T I D A L   D A T U M S 


Tidal datums at WILLIAM BROOKS PARK, CHICKASAW CREEK based on:

     LENGTH OF SERIES:      9 MONTHS
     TIME PERIOD:           December 2011 - August 2012
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8737048 MOBILE STATE DOCKS, MOBILE RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.510
     MEAN HIGH WATER                            MHW    =  0.477
     MEAN TIDE LEVEL                            MTL    =  0.258
     MEAN SEA LEVEL                             MSL    =  0.256
     MEAN LOW WATER                             MLW    =  0.038
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     873 7138 DOT 1                              4.315    3.838
     J 367 1951                                  2.501    2.024
     7138 A 2011                                 0.746    0.269
     7138 B 2011                                 0.799    0.322
     873 7138 DOT 2                              4.309    3.832


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

                                                                                
Station ID: 8737138                         PUBLICATION DATE:  04/11/2013
Name:       WILLIAM BROOKS PARK, CHICKASAW CREEK              
            AL
NOAA Chart: 11376                           Latitude:   30° 46.9' N (  30.78189)
USGS Quad:  CHICKASAW                       Longitude:  88°  4.4' W ( -88.07361)


                             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 8737138 Chickasaw Creek, AL

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