U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 5
Station ID: 8774513 PUBLICATION DATE: 08/09/2018
Name: COPANO BAY STATE FISHING PIER
NOAA Chart: 11314 Latitude: 28° 6.9' N ( 28.11440)
USGS Quad: ROCKPORT Longitude: 97° 1.5' W ( -97.02440)
To reach the station from the intersection HWY 35 and FM 3036 in the city of
Fulton, proceed north on HWY 35 6 km (3.7 mi) to the south end of the Copano Bay
Fishing Pier. The tide station is located on the east side of the pier, 400
feet (121.9 m) from the baithouse.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4513 C 1989
DESIGNATION: 877 4513 C
MONUMENTATION: Bench Mark disk VM#: 10577
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 28° 6.8' N ( 28.11264) LONGITUDE: 97° 1.6' W ( -97.02592)
The primary bench mark is a disk located SW of the Southwestern Bell Telephone
junction house, 45 m (149 ft) north of the third power pole south of the boat
ramp, 19 m (62 ft) WNW of the centerline of the access road, and 17 m (56 ft) SW
of the second power pole south of the boat ramp. The bench mark is crimped to
the top of a stainless steel rod driven 19.5 m (64 ft) to substantial
resistance.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8774513 PUBLICATION DATE: 08/09/2018
Name: COPANO BAY STATE FISHING PIER
NOAA Chart: 11314 Latitude: 28° 6.9' N ( 28.11440)
USGS Quad: ROCKPORT Longitude: 97° 1.5' W ( -97.02440)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4513 A 1989
DESIGNATION: 877 4513 A
MONUMENTATION: Bench Mark disk VM#: 10578
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 28° 6.8' N ( 28.11356) LONGITUDE: 97° 1.5' W ( -97.02567)
The bench mark is a disk set in the NW corner of a bulkhead at a boat ramp, 56 m
(185 ft) SW of the SW corner of the Copano State Fishing Pier building, 51 m
(167 ft) WNW of the centerline of the access road, and 14 m (46 ft) WNW of the
east end of the ramp bulkhead.
BENCH MARK STAMPING: 90035-F-1992
DESIGNATION: 877 4513 F
MONUMENTATION: Bench Mark disk VM#: 17061
AGENCY: Conrad Blucher Institute (CBI) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBDN95
LATITUDE: 28° 6.8' N ( 28.11358) LONGITUDE: 97° 1.5' W ( -97.02497)
The bench mark is a brass disk located at the south end of the fishing pier,
120.4 m (395 ft) SW of the tide gauge, crimped to the top of a stainless steel
rod driven an unspecified depth to refusal, and encased in a 6-inch PVC pipe
with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8774513 PUBLICATION DATE: 08/09/2018
Name: COPANO BAY STATE FISHING PIER
NOAA Chart: 11314 Latitude: 28° 6.9' N ( 28.11440)
USGS Quad: ROCKPORT Longitude: 97° 1.5' W ( -97.02440)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 90036-G-1992
DESIGNATION: 877 4513 G
MONUMENTATION: Bench Mark disk VM#: 17062
AGENCY: Conrad Blucher Institute (CBI) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 28° 6.7' N ( 28.11136) LONGITUDE: 97° 1.6' W ( -97.02675)
The bench mark is a disk located on the west side of the access road leading to
the Copano Bay State Fishing Pier, 98 m (320 ft) SW of bench mark 4513 D 1989, 4
m (13 ft) north of a power pole, and 2 m (6 ft) west of the overhead power line.
The bench mark is crimped to the top of a stainless steel rod driven an
unspecified depth to refusal, and encased in a 6-inch PVC pipe with concrete
kickblock.
BENCH MARK STAMPING: 4513 H 2009
DESIGNATION: 877 4513 H
MONUMENTATION: Metal Rod VM#: 22116
AGENCY: Conrad Blucher Institute (CBI) IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 28° 6.7' N ( 28.11208) LONGITUDE: 97° 1.6' W ( -97.02628)
The bench mark is a stainless steel deep rod located 34 m (111.5 ft) north of
the fourth power pole south of the boat ramp, 28 m (91.9 ft) SW of the third
power pole south of boat ramp, and 19 m (62.3 ft) WNW of the centerline of the
access road, driven to refusal and encased in 6 in PVC pipe with concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8774513 PUBLICATION DATE: 08/09/2018
Name: COPANO BAY STATE FISHING PIER
NOAA Chart: 11314 Latitude: 28° 6.9' N ( 28.11440)
USGS Quad: ROCKPORT Longitude: 97° 1.5' W ( -97.02440)
T I D A L D A T U M S
Tidal datums at COPANO BAY STATE FISHING PIER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: August 2016 - July 2017
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 (08/26/2017) = 1.341
MEAN HIGHER HIGH WATER MHHW = 0.118
MEAN HIGH WATER MHW = 0.117
MEAN SEA LEVEL MSL = 0.062
MEAN TIDE LEVEL MTL = 0.058
MEAN LOW WATER MLW = 0.000
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.192
LOWEST OBSERVED WATER LEVEL (08/26/2017) = -1.183
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4513 C 1989 1.023 0.906
4513 A 1989 0.754 0.637
90035-F-1992 2.121 2.004
90036-G-1992 1.584 1.467
4513 H 2009 1.169 1.052
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8774513 PUBLICATION DATE: 08/09/2018
Name: COPANO BAY STATE FISHING PIER
NOAA Chart: 11314 Latitude: 28° 6.9' N ( 28.11440)
USGS Quad: ROCKPORT Longitude: 97° 1.5' W ( -97.02440)
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.