NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

Bench Mark Sheet for 8770808, High Island 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8770808                         PUBLICATION DATE:  10/02/2017
Name:       HIGH ISLAND ICWW                                  
            TX
NOAA Chart: 11332                           Latitude:   29° 35.7' N (  29.59453)
USGS Quad:  HIGH ISLAND                     Longitude:  94° 23.4' W ( -94.38958)


From Beaumont, TX proceed west on I10, take exit 829 for state highway 124 and
head south for approximately 17 miles. The station is located next to the HWY
124 bridge crossing the ICWW on the north side of bridge, south side of ICWW.
There is a boat ramp located next to station that can accommodate a small boat.
Be aware there is no dock at boat ramp. Station is a 4 pile structure 20 ft off
the bank. Will need a boat/canoe/kayak to transit to station.


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


                 PRIMARY BENCH MARK STAMPING:  0808 B 2012
                         DESIGNATION:          877 0808 B

MONUMENTATION:           Flange-encased Rod                    VM#:        20725
AGENCY:                  Division of Nearshore Research        IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   29° 35.6' N (  29.59300)          LONGITUDE:  94° 23.4' W ( -94.38997)


The bench mark is a deep rod mark encased in a 6 inch (15 cm) PVC kickblock with
access cover, located 103 m (337.9 ft) north of 0808 C 2012, 100 m (328 ft)
south of 0808 A 2012 and 5.9 m (19.4 ft) east of the centerline of the road,
driven to refusal to a depth of 12.2 m (40 ft).

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8770808                         PUBLICATION DATE:  10/02/2017
Name:       HIGH ISLAND ICWW                                  
            TX
NOAA Chart: 11332                           Latitude:   29° 35.7' N (  29.59453)
USGS Quad:  HIGH ISLAND                     Longitude:  94° 23.4' W ( -94.38958)


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


                         BENCH MARK STAMPING:  0808 A 2012
                         DESIGNATION:          877 0808 A

MONUMENTATION:           Flange-encased Rod                    VM#:        20724
AGENCY:                  Division of Nearshore Research        IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   29° 35.6' N (  29.59386)          LONGITUDE:  94° 23.4' W ( -94.38975)


The bench mark is a deep rod mark encased in a 6 inch (15 cm) PVC kickblock with
access cover, located 100 m (328 ft) north of 0808 B 2012, 8.6 m (28.2 ft) NE of
a 4 inch (10 cm) wooden power pole #21355 that houses electronics for fiber
optics and has a warning sign, and 2.7 m (8.9 ft) north of the centerline of
Caliche Road leading to the tide station.  The deep rod mark is driven to
refusal to a depth of 14.63 m (48 ft).



                         BENCH MARK STAMPING:  0808 C 2012
                         DESIGNATION:          877 0808 C

MONUMENTATION:           Flange-encased Rod                    VM#:        20726
AGENCY:                  Division of Nearshore Research        IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   29° 35.5' N (  29.59217)          LONGITUDE:  94° 23.4' W ( -94.39033)


The bench mark is a deep rod mark encased in a 6 inch (15 cm) PVC kickblock with
access cover, located 103 m (337.9 ft) south of 0808 B 2012, 20.2 m (66.3 ft) SE
of a 4x4 round wooden pile that encases a buried fiber optic cable warning sign,
and 4.9 m (16.1 ft) east of the centerline of the road, driven to refusal to a
depth of 18.3 m (60 ft).

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8770808                         PUBLICATION DATE:  10/02/2017
Name:       HIGH ISLAND ICWW                                  
            TX
NOAA Chart: 11332                           Latitude:   29° 35.7' N (  29.59453)
USGS Quad:  HIGH ISLAND                     Longitude:  94° 23.4' W ( -94.38958)


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


                         BENCH MARK STAMPING:  0808 D 2012
                         DESIGNATION:          877 0808 D

MONUMENTATION:           Bench Mark disk                       VM#:        20727
AGENCY:                  Division of Nearshore Research        IDB PID#:        
SETTING CLASSIFICATION:  Concrete culvert                      OPUS PID:        
LATITUDE:   29° 35.4' N (  29.59078)          LONGITUDE:  94° 23.5' W ( -94.39092)


The bench mark is a brass surface mark set in the top of a 0.6 m (2 ft) thick
concrete culvert, located 159 m (521.7 ft) south of 0808 C 2012, 97 m (318.2 ft)
north of 0808 D 2012 and 5.6 m (18.4 ft) east of the centerline of the road.



                         BENCH MARK STAMPING:  0808 E 2012
                         DESIGNATION:          877 0808 E

MONUMENTATION:           Flange-encased Rod                    VM#:        20728
AGENCY:                  Division of Nearshore Research        IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: BBFF80
LATITUDE:   29° 35.4' N (  29.58992)          LONGITUDE:  94° 23.5' W ( -94.39128)


The bench mark is a stainless steel rod encased in a 6 inch (15 cm) PVC concrete
kickblock with access cover, located 97 m (318 ft) south of 0808 D 2012, 21 m
(68.9 ft) east of a high tension power pole, 5.9 m (19.4 ft) east of the
centerline of the road, and driven to refusal to a depth of 19.5 m (64 ft).

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8770808                         PUBLICATION DATE:  10/02/2017
Name:       HIGH ISLAND ICWW                                  
            TX
NOAA Chart: 11332                           Latitude:   29° 35.7' N (  29.59453)
USGS Quad:  HIGH ISLAND                     Longitude:  94° 23.4' W ( -94.38958)


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


                         BENCH MARK STAMPING:  HIGH ISLAND 2002
                         DESIGNATION:          HIGH ISLAND 2002

MONUMENTATION:           Flange-encased Rod                    VM#:        20729
AGENCY:                  Division of Nearshore Research        IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   29° 35.6' N (  29.59411)          LONGITUDE:  94° 23.4' W ( -94.38967)


The bench mark is a deep rod mark housed in a 6 inch (15 cm) PVC concrete
kickblock, located 38.9 m (127 ft) NW of the abandoned road leading to the ICW,
34.5 m (113.2 ft) NW of a galvanized dead end road barrier, and 4.6 m (15.1 ft)
west of the center line of an abandoned road leading to the ICW.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8770808                         PUBLICATION DATE:  10/02/2017
Name:       HIGH ISLAND ICWW                                  
            TX
NOAA Chart: 11332                           Latitude:   29° 35.7' N (  29.59453)
USGS Quad:  HIGH ISLAND                     Longitude:  94° 23.4' W ( -94.38958)


                            T I D A L   D A T U M S 


Tidal datums at HIGH ISLAND ICWW based on:

     LENGTH OF SERIES:      10 MONTHS
     TIME PERIOD:           February 2016 - November 2016
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8770971 ROLLOVER PASS


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

     HIGHEST OBSERVED WATER LEVEL (08/30/2017)         =  1.683
     MEAN HIGHER HIGH WATER                     MHHW   =  0.430
     MEAN HIGH WATER                            MHW    =  0.402
     MEAN SEA LEVEL                             MSL    =  0.239
     MEAN TIDE LEVEL                            MTL    =  0.234
     MEAN LOW WATER                             MLW    =  0.067
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (02/25/2016)         = -0.453

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     0808 B 2012                                 0.940    0.538
     0808 A 2012                                 1.947    1.545
     0808 C 2012                                 1.067    0.665
     0808 D 2012                                 1.237    0.835
     0808 E 2012                                 0.941    0.539
     HIGH ISLAND 2002                            3.781    3.379


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

                                                                                
Station ID: 8770808                         PUBLICATION DATE:  10/02/2017
Name:       HIGH ISLAND ICWW                                  
            TX
NOAA Chart: 11332                           Latitude:   29° 35.7' N (  29.59453)
USGS Quad:  HIGH ISLAND                     Longitude:  94° 23.4' W ( -94.38958)


                             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.

Return to Top
Products available at 8770808 High Island, TX

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services