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.

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                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                                                
Station ID: 8770520                         PUBLICATION DATE:  06/13/2018
Name:       RAINBOW BRIDGE, NECHES RIVER                      
            TX
NOAA Chart: 11342                           Latitude:   29° 58.9' N (  29.98119)
USGS Quad:  PORT ARTHUR NORTH               Longitude:  93° 53.1' W ( -93.88469)


To reach the tide station from the intersection of Atlantic Road and 32nd Street
in the city of Groves, enter the "Fina" plant at the NE side of the intersection
and go to their loading docks on the Neches river. The tide gauge and staff are
located on the most westerly dock.


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


                 PRIMARY BENCH MARK STAMPING:  LUB 0520 B
                         DESIGNATION:          877 0520 B

MONUMENTATION:           Bench Mark disk                       VM#:        16779
AGENCY:                  Lamar University Beaumont (LUB)       IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   29° 58.8' N (  29.98014)          LONGITUDE:  93° 52.9' W ( -93.88161)


The primary bench mark is a brass disk located 100.6 m (330 ft) NW of bench mark
LUB 0520 A, marked with an orange witness post, crimped onto a stainless steel
rod driven 16.8 m (55 ft) to refusal, encased in a 6" PVC pipe with concrete
kickblock set flush with the ground.



                         BENCH MARK STAMPING:  LUB 0520 A 1992
                         DESIGNATION:          877 0520 A

MONUMENTATION:           Bench Mark disk                       VM#:        16778
AGENCY:                  Lamar University Beaumont (LUB)       IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   29° 58.8' N (  29.98006)          LONGITUDE:  93° 52.8' W ( -93.88056)


The bench mark is a brass disk located 115.8 m (379.9 ft) SE of the tide staff,
crimped onto a stainless steel rod driven 16.8 m (55 ft) to refusal, encased in
a 6" PVC pipe with concrete kickblock set flush with the ground.

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

                                                                                
Station ID: 8770520                         PUBLICATION DATE:  06/13/2018
Name:       RAINBOW BRIDGE, NECHES RIVER                      
            TX
NOAA Chart: 11342                           Latitude:   29° 58.9' N (  29.98119)
USGS Quad:  PORT ARTHUR NORTH               Longitude:  93° 53.1' W ( -93.88469)


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


                         BENCH MARK STAMPING:  LUB 0520 C 1992
                         DESIGNATION:          877 0520 C

MONUMENTATION:           Bench Mark disk                       VM#:        16780
AGENCY:                  Lamar University Beaumont (LUB)       IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: DO9976
LATITUDE:   29° 58.8' N (  29.98008)          LONGITUDE:  93° 53.0' W ( -93.88261)


The bench mark is a brass disk located 85.3 m (280 ft) west of bench mark LUB
0520 B, 0.3 m (1 ft) from a utility pole at a bend in the road, crimped onto a
stainless steel rod driven 16.8 m (55 ft) to refusal, encased in a 6" PVC pipe
with concrete kickblock set flush with the ground.



                         BENCH MARK STAMPING:  LUB 0520 D 1992
                         DESIGNATION:          877 0520 D

MONUMENTATION:           Bench Mark disk                       VM#:        16781
AGENCY:                  Lamar University Beaumont (LUB)       IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: DL4467
LATITUDE:   29° 58.8' N (  29.97928)          LONGITUDE:  93° 53.0' W ( -93.88286)


The bench mark is a brass disk located 82.3 m (270.0 ft) SW of bench mark LUB
0520 C, 0.3 m (1.0 ft) from a utility pole beside the road, crimped onto a
stainless steel rod driven 16.8 m (55 ft) to refusal, encased in a 6" PVC pipe
with concrete kickblock set flush with the ground.  

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

                                                                                
Station ID: 8770520                         PUBLICATION DATE:  06/13/2018
Name:       RAINBOW BRIDGE, NECHES RIVER                      
            TX
NOAA Chart: 11342                           Latitude:   29° 58.9' N (  29.98119)
USGS Quad:  PORT ARTHUR NORTH               Longitude:  93° 53.1' W ( -93.88469)


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


                         BENCH MARK STAMPING:  LUB 0520 E 1992
                         DESIGNATION:          877 0520 E

MONUMENTATION:           Bench Mark disk                       VM#:        16782
AGENCY:                  Lamar University Beaumont (LUB)       IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: BBFY15
LATITUDE:   29° 58.7' N (  29.97853)          LONGITUDE:  93° 53.0' W ( -93.88314)


The bench mark is a brass disk located about 76.8 m (252 ft) SW of bench mark
LUB 0520 D, 0.3 m (1 ft) from a utility pole at a bend in the road, marked with
an orange witness post, crimped onto a stainless steel rod driven 16.8 m (55 ft)
to refusal and is encased in a 6" PVC pipe with concrete kickblock set flush
with the ground.

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

                                                                                
Station ID: 8770520                         PUBLICATION DATE:  06/13/2018
Name:       RAINBOW BRIDGE, NECHES RIVER                      
            TX
NOAA Chart: 11342                           Latitude:   29° 58.9' N (  29.98119)
USGS Quad:  PORT ARTHUR NORTH               Longitude:  93° 53.1' W ( -93.88469)


                            T I D A L   D A T U M S 


Tidal datums at RAINBOW BRIDGE, NECHES RIVER based on:

     LENGTH OF SERIES:      3 YEARS
     TIME PERIOD:           Oct 2012 - Sept 2013 and Sept 2015 - Aug 2017
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8770570 SABINE PASS NORTH


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.297
     MEAN HIGH WATER                            MHW    =  0.281
     MEAN SEA LEVEL                             MSL    =  0.168
     MEAN TIDE LEVEL                            MTL    =  0.158
     North American Vertical Datum              NAVD88 =  0.106
     MEAN LOW WATER                             MLW    =  0.034
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     LUB 0520 B                                  1.351    1.070
     LUB 0520 A 1992                             1.162    0.881
     LUB 0520 C 1992                             1.402    1.121
     LUB 0520 D 1992                             1.002    0.721
     LUB 0520 E 1992                             0.784    0.503

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

                                                                                
Station ID: 8770520                         PUBLICATION DATE:  06/13/2018
Name:       RAINBOW BRIDGE, NECHES RIVER                      
            TX
NOAA Chart: 11342                           Latitude:   29° 58.9' N (  29.98119)
USGS Quad:  PORT ARTHUR NORTH               Longitude:  93° 53.1' W ( -93.88469)


                             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.