Bench Mark Sheet for 8772985, Sargent 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8772985                         PUBLICATION DATE:  12/12/2018
Name:       SARGENT, ICWW                                     
            TX
NOAA Chart:                                 Latitude:   28° 46.3' N (  28.77142)
USGS Quad:  CEDAR LAKES WEST                Longitude:  95° 37.0' W ( -95.61717)


To reach the station from the intersection of Farm to Market Road 457 and State
Highway 35 in Bay City, Texas, proceed east on Farm to Market Road 457 for 27.5
mi (44.2 km) to the Intercoastal Waterway.  The station is located near the west
bank of the Intercoastal Water Way before the bridge to cross to Sargent Beach.
The benchmarks are located on both sides of FM 457 near the swing bridge office
and marina across the street.


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


                 PRIMARY BENCH MARK STAMPING:  2985 B 2012
                         DESIGNATION:          877 2985 B

MONUMENTATION:           Flange-encased Rod                    VM#:        20701
AGENCY:                  Conrad Blucher Institute (CBI)        IDB PID:         
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   28° 46.3' N (  28.77200)          LONGITUDE:  95° 37.1' W ( -95.61767)


The mark is a stainless steel deep rod located 20.65 m (67.7 ft) ENE of the
centerline of the road, 10.77 m (35.3 ft) SE of the power pole closest to the
dirt road, and 3.048 m (10.0 ft) NW of the Confederate Defenses historical
marker.  The deep rod bench mark is driven 19.5 m (64.0 ft) until refusal and is
encased in a 6 inch PVC pipe with concrete kickblock.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8772985                         PUBLICATION DATE:  12/12/2018
Name:       SARGENT, ICWW                                     
            TX
NOAA Chart:                                 Latitude:   28° 46.3' N (  28.77142)
USGS Quad:  CEDAR LAKES WEST                Longitude:  95° 37.0' W ( -95.61717)


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


                         BENCH MARK STAMPING:  2985 A 2012
                         DESIGNATION:          877 2985 A

MONUMENTATION:           Bench Mark disk                       VM#:        20700
AGENCY:                  Division of Nearshore Research (DNR)  IDB PID:         
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   28° 46.3' N (  28.77167)          LONGITUDE:  95° 37.0' W ( -95.61739)


The bench mark is a brass disk set flush in the concrete sidewalk of the USACE.
The bench mark is located 23.24 m (76.2 ft) ENE of the centerline of the road,
16.68 m (54.7 ft) WNW of a light pole, and 14.04 m (46.1 ft) SE from the power
pole closest to the USACE parking lot.



                         BENCH MARK STAMPING:  2985 D 2012
                         DESIGNATION:          877 2985 D

MONUMENTATION:           Flange-encased Rod                    VM#:        20703
AGENCY:                  Conrad Blucher Institute (CBI)        IDB PID:         
SETTING CLASSIFICATION:                                        OPUS PID#: DP0702
LATITUDE:   28° 46.3' N (  28.77206)          LONGITUDE:  95° 37.1' W ( -95.61872)


The bench mark is a stainless steel deep rod mark located 70.72 m (232.0 ft) WSW
of the centerline of a paved road, 59.06 m (193.8 ft) NW of bench mark 2985 E
2012, and 57.71 m (189.3 ft) WSW of benchmark 2985 C 2012. The deep rod bench
mark is driven 17.07 m (56.0 ft) until refusal and is encased in a 6 inch PVC
pipe with a concrete kickblock.

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

                                                                                
Station ID: 8772985                         PUBLICATION DATE:  12/12/2018
Name:       SARGENT, ICWW                                     
            TX
NOAA Chart:                                 Latitude:   28° 46.3' N (  28.77142)
USGS Quad:  CEDAR LAKES WEST                Longitude:  95° 37.0' W ( -95.61717)


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


                         BENCH MARK STAMPING:  2985 E 2012
                         DESIGNATION:          877 2985 E

MONUMENTATION:           Flange-encased Rod                    VM#:        20704
AGENCY:                  Conrad Blucher Institute (CBI)        IDB PID:         
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   28° 46.3' N (  28.77158)          LONGITUDE:  95° 37.1' W ( -95.61853)


The bench mark is a stainless steel deep rod located 80.07 m (262.7 ft) SW of
bench mark 2985 C 2012, 59.06 m (193.8 ft) SSE of bench mark 2985 D 2012, and
42.95 m (140.9 ft) NW of a boat ramp. The deep rod bench mark is driven 21.95 m
(72.0 ft) until refusal and encased in a 6 inch (15 cm) PVC pipe with a concrete
kickblock.

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

                                                                                
Station ID: 8772985                         PUBLICATION DATE:  12/12/2018
Name:       SARGENT, ICWW                                     
            TX
NOAA Chart:                                 Latitude:   28° 46.3' N (  28.77142)
USGS Quad:  CEDAR LAKES WEST                Longitude:  95° 37.0' W ( -95.61717)


                            T I D A L   D A T U M S 


Tidal datums at SARGENT, ICWW based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           January 2016 - December 2016
     TIDAL EPOCH:           2002-2006
     CONTROL TIDE STATION:  8774770 ROCKPORT, ARANSAS BAY


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

     HIGHEST OBSERVED WATER LEVEL (08/29/2017)         =  1.102
     MEAN HIGHER HIGH WATER                     MHHW   =  0.176
     MEAN HIGH WATER                            MHW    =  0.167
     MEAN SEA LEVEL                             MSL    =  0.098
     MEAN TIDE LEVEL                            MTL    =  0.087
     MEAN LOW WATER                             MLW    =  0.006
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/04/2018)         = -0.522

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2985 B 2012                                 0.477    0.310
     2985 A 2012                                 1.456    1.289
     2985 D 2012                                 0.877    0.710
     2985 E 2012                                 0.669    0.502


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

                                                                                
Station ID: 8772985                         PUBLICATION DATE:  12/12/2018
Name:       SARGENT, ICWW                                     
            TX
NOAA Chart:                                 Latitude:   28° 46.3' N (  28.77142)
USGS Quad:  CEDAR LAKES WEST                Longitude:  95° 37.0' W ( -95.61717)


                             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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