U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8770808 PUBLICATION DATE: 04/20/2020
Name: HIGH ISLAND ICWW
TX
NOAA Chart: 11332 Latitude: 29° 35.7' N ( 29.59470)
USGS Quad: HIGH ISLAND Longitude: 94° 23.4' W ( -94.39030)
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.
The benchmarks are located on the east side of the paved road leading to the
ramp. 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: Conrad Blucher Institute (CBI) IDB PID#: DR3184
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBGD06
LATITUDE: 29° 35.6' N ( 29.59303) LONGITUDE: 94° 23.4' W ( -94.38994)
The bench mark is a stainless steel rod located 103.0 m (337.9 ft) north of 0808
C 2012, 52.20 m (171.2 ft) NNE of a dead end sign on the east side of the access
road, and 5.9 m (19.4 ft) east of the centerline of the road. The datum point
is the top of a stainless steel rod driven 12.20 m (40 ft) to refusal, and
encased in a 6 inch (15 cm) PVC kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8770808 PUBLICATION DATE: 04/20/2020
Name: HIGH ISLAND ICWW
TX
NOAA Chart: 11332 Latitude: 29° 35.7' N ( 29.59470)
USGS Quad: HIGH ISLAND Longitude: 94° 23.4' W ( -94.39030)
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: Conrad Blucher Institute (CBI) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 35.6' N ( 29.59383) LONGITUDE: 94° 23.4' W ( -94.38981)
The benchmark is located 12.75 m (41.8 ft) WSW of a wooden powerpole found on
the east side of the road near dead end, 8.60 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 2.70 m (8.9 ft) north of the centerline of Caliche Road
leading to the tide station. The datum point is the top of a stainless steel
rod rod driven 14.63m (48.0 ft) to refusal, and encased in a 6 inch (15 cm) PVC
kickblock.
BENCH MARK STAMPING: 0808 C 2012
DESIGNATION: 877 0808 C
MONUMENTATION: Flange-encased Rod VM#: 20726
AGENCY: Conrad Blucher Institute (CBI) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 35.5' N ( 29.59217) LONGITUDE: 94° 23.4' W ( -94.39031)
The bench mark is a stainless steel rod located 21.90 m (71.8 ft) ESE of a
wooden power pole located on the west side of the access road, 20.20 m (66.3 ft)
SE of a 4x4 round wooden pile that encases a buried fiber optic cable warning
sign, and 4.90 m (16.1 ft) east of the centerline of the road. The datum point
is the top of a stainless steel rod driven 18.30 m (60 ft) to refusal, and
encased in a 6 inch (15 cm) PVC kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8770808 PUBLICATION DATE: 04/20/2020
Name: HIGH ISLAND ICWW
TX
NOAA Chart: 11332 Latitude: 29° 35.7' N ( 29.59470)
USGS Quad: HIGH ISLAND Longitude: 94° 23.4' W ( -94.39030)
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 ( 29.59075) LONGITUDE: 94° 23.5' W ( -94.39089)
The bench mark is a brass surface mark set in the top of a 0.60 m (2 ft) thick
concrete culvert, located 159.0 m (521.7 ft) south of 0808 C 2012, 97.00 m
(318.2 ft) north of 0808 D 2012 and 5.60 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: Conrad Blucher Institute (CBI) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBFF80
LATITUDE: 29° 35.4' N ( 29.58994) LONGITUDE: 94° 23.5' W ( -94.39125)
The bench mark is a stainless steel rod located 97.00 m (318 ft) south of 0808 D
2012, 21.00 m (68.9 ft) east of a high tension power pole, and 5.90 m (19.4 ft)
east of the centerline of the road. The datum point is the top of a stainless
steel rod driven 19.50 m (64 ft) to refusal, and encased in a 6 inch (15 cm) PVC
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8770808 PUBLICATION DATE: 04/20/2020
Name: HIGH ISLAND ICWW
TX
NOAA Chart: 11332 Latitude: 29° 35.7' N ( 29.59470)
USGS Quad: HIGH ISLAND Longitude: 94° 23.4' W ( -94.39030)
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: Survey disk VM#: 20729
AGENCY: US Army Corps of Engineers IDB PID#:
SETTING CLASSIFICATION: Flange encased rod OPUS PID#: BBDP14
LATITUDE: 29° 35.7' N ( 29.59419) LONGITUDE: 94° 23.4' W ( -94.38961)
The bench mark is a stainless steel rod located 38.90 m (127.6 ft) NW of the
abandoned road leading to the ICW, 34.50 m (113.2 ft) NW of a galvanized dead
end road barrier, and 4.60 m (15.1 ft) west of the center line of an abandoned
road leading to the ICW. The datum point is the top of a stainless steel rod
driven 15.00 m (49.2 ft) to refusal, and encased in 6 inch PVC in a concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8770808 PUBLICATION DATE: 04/20/2020
Name: HIGH ISLAND ICWW
TX
NOAA Chart: 11332 Latitude: 29° 35.7' N ( 29.59470)
USGS Quad: HIGH ISLAND Longitude: 94° 23.4' W ( -94.39030)
T I D A L D A T U M S
Tidal datums at HIGH ISLAND ICWW based on:
LENGTH OF SERIES: 2 YEARS
TIME PERIOD: January 2017 - December 2018
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) = 1.723
MEAN HIGHER HIGH WATER MHHW = 0.403
MEAN HIGH WATER MHW = 0.372
MEAN SEA LEVEL MSL = 0.225
MEAN TIDE LEVEL MTL = 0.215
North American Vertical Datum NAVD88 = 0.204
MEAN LOW WATER MLW = 0.058
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/20/2019) = -0.612
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0808 B 2012 0.980 0.608
0808 A 2012 1.987 1.615
0808 C 2012 1.107 0.735
0808 D 2012 1.277 0.905
0808 E 2012 0.981 0.609
HIGH ISLAND 2002 3.823 3.451
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8770808 PUBLICATION DATE: 04/20/2020
Name: HIGH ISLAND ICWW
TX
NOAA Chart: 11332 Latitude: 29° 35.7' N ( 29.59470)
USGS Quad: HIGH ISLAND Longitude: 94° 23.4' W ( -94.39030)
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.