U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8775792 PUBLICATION DATE: 05/01/2020
Name: PACKERY CHANNEL
TX
NOAA Chart: 11309 Latitude: 27° 38.0' N ( 27.63331)
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W ( -97.23669)
To reach the tidal bench marks from the intersection of State Highway 358 (South
Padre Island Drive) and State Highway 286 in Corpus Christi, proceed SE on State
Highway 358 for 16 km (10 mi) to a 'Y' intersection, then turn to the right at
the 'Y' on Park Road 22, proceed SE for 6.9 km (4.3 mi) across the Intracoastal
Waterway on the John F. Kennedy (JFK) Causeway, then turn right under the bridge
on to the north access road to Coastway Bait & Tackle Shop. The bench marks are
located under the JFK Causeway and near Coastway Bait & Tackle Shop. The tide
gauge was located on the east side of the Coastway Bait & Tackle Shop, adjacent
to boat ramp.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5792 A 1988
DESIGNATION: 877 5792 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 12210
AGENCY: National Ocean Service (NOS) IDB PID#: AC8464
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: AC8464
LATITUDE: 27° 38.1' N ( 27.63458) LONGITUDE: 97° 14.2' W ( -97.23708)
The bench mark is a disk located 77.70 m (254.9 ft) north of the Park Road 22
centerline, 16.60 m (54.5 ft) NW of the SW corner of the Coastway Bait and
Tackle shop, 9.70 m (31.8 ft) west of the NW corner of the bait shop, 3.30 m
(10.8 ft) NW of a utility pole, 1.70 m (5.6 ft) south of the north bulkhead,
1.60 m (5.2 ft) east of the west bulkhead, 0.30 m (1.0 ft) east of the east edge
of a sidewalk, set 0.1 m (0.3 ft) below ground level, crimped to the top of a
stainless steel rod driven 17.0 m (56 ft) to substantial resistance, and encased
in a 5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8775792 PUBLICATION DATE: 05/01/2020
Name: PACKERY CHANNEL
TX
NOAA Chart: 11309 Latitude: 27° 38.0' N ( 27.63331)
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W ( -97.23669)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5792 B 1988
DESIGNATION: 877 5792 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 12211
AGENCY: National Ocean Service (NOS) IDB PID#: AC8465
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 27° 38.0' N ( 27.63397) LONGITUDE: 97° 14.3' W ( -97.23792)
The bench mark is a disk located 19.3 m (63.3 ft) north of the centerline of the
south turn around, 18.4 m (60.4 ft) south of the centerline of the north turn
around, 1.60 m (5.2 ft) west of the center column of the 11th pier west of the
east end of the JFK Causeway Bridge, 0.50 m (1.6 ft) north of a witness post,
and set 0.3m (1.0 ft) below the level of the road, crimped to the top of a
stainless steel rod driven 11.0 m (36 ft) to substantial resistance, and encased
in a 5-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 5792 C 1988
DESIGNATION: 877 5792 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 12212
AGENCY: National Ocean Service (NOS) IDB PID#: AC8463
SETTING CLASSIFICATION: Concrete tie beam OPUS PID:
LATITUDE: 27° 38.0' N ( 27.63356) LONGITUDE: 97° 14.2' W ( -97.23689)
The bench mark is a disk set flush in a concrete pile cap of the 7th pier west
of the east abutment of the JFK Causeway, 21.90 m (71.9 ft) SE of the center of
the north turn around, 21.40 m (70.2 ft) NW of the center of the south turn
around, 6.00 m (19.7 ft) south of the north end of the abutment, 0.50 m (1.6 ft)
north of the center column and 0.49 m (1.6 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8775792 PUBLICATION DATE: 05/01/2020
Name: PACKERY CHANNEL
TX
NOAA Chart: 11309 Latitude: 27° 38.0' N ( 27.63331)
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W ( -97.23669)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5792 D 1988
DESIGNATION: 877 5792 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 12213
AGENCY: National Ocean Service (NOS) IDB PID#: AC8462
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 27° 38.0' N ( 27.63286) LONGITUDE: 97° 14.1' W ( -97.23558)
The bench mark is a disk located 35.60 m (116.8 ft) NW of the centerline of the
turn around 8.20 m (26.9 ft) SW of the center of the JFK Causeway, 1.30 m (4.3
ft) South of the South column of the 1st Pier west of the east abutment, 0.40 m
(1.3 ft) SE of a witness post, set 0.3 m (1.0 ft) below the level of the road,
crimped to the top of a stainless steel rod driven 18.3 m (60 ft) into the
ground, and encased in a 5-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 5792 E 1988
DESIGNATION: 877 5792 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 12214
AGENCY: National Ocean Service (NOS) IDB PID#: AC8466
SETTING CLASSIFICATION: Concrete tie beam OPUS PID:
LATITUDE: 27° 38.1' N ( 27.63428) LONGITUDE: 97° 14.3' W ( -97.23869)
The bench mark is a disk set flush in a concrete pile cap, located 32.20 m
(105.6 ft) north of the center of the south turn around, 5.80 m (19.0 ft) south
of the road center, 1.30 m (4.3 ft) north of the south end of the concrete pile
cap of the 15th pier west of the east abutment of the JFK Causeway Bridge, 0.90
m (3.0 ft) west of a witness post, and 1.0 m (3.0 ft) above the level of the
road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8775792 PUBLICATION DATE: 05/01/2020
Name: PACKERY CHANNEL
TX
NOAA Chart: 11309 Latitude: 27° 38.0' N ( 27.63331)
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W ( -97.23669)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5792 F 2006
DESIGNATION: 877 5792 F
MONUMENTATION: Bench Mark disk VM#: 20759
AGENCY: Conrad Blucher Institute (CBI) IDB PID:
SETTING CLASSIFICATION: OPUS PID#: BBGF89
LATITUDE: 27° 38.1' N ( 27.63419) LONGITUDE: 97° 14.2' W ( -97.23642)
The bench mark is a brass disk set flush with the concrete, located 30.80 m WSW
of the west side of the tide station, 18.50 m WNW of the center of the boat
ramp, and 6.20 m SSE of the NE corner of Billing s Bait Stand.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8775792 PUBLICATION DATE: 05/01/2020
Name: PACKERY CHANNEL
TX
NOAA Chart: 11309 Latitude: 27° 38.0' N ( 27.63331)
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W ( -97.23669)
T I D A L D A T U M S
Tidal datums at PACKERY CHANNEL based on:
LENGTH OF SERIES: 5 YEARS
TIME PERIOD: 10/2012-09/2013, 11/2014-10/2015, 03/2016-02/2019
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8779770 PORT ISABEL, LAGUNA MADRE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (08/26/2017) = 1.550
MEAN HIGH WATER MHW = 0.131
MEAN HIGHER HIGH WATER MHHW = 0.130
MEAN SEA LEVEL MSL = 0.068
MEAN TIDE LEVEL MTL = 0.065
MEAN LOWER LOW WATER MLLW = 0.000
MEAN LOW WATER MLW = -0.001
North American Vertical Datum NAVD88 = -0.111
LOWEST OBSERVED WATER LEVEL (12/28/1989) = -0.392
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5792 A 1988 0.724 0.593
5792 B 1988 0.706 0.575
5792 C 1988 1.331 1.200
5792 D 1988 0.631 0.500
5792 E 1988 1.481 1.350
5792 F 2006 0.801 0.670
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8775792 PUBLICATION DATE: 05/01/2020
Name: PACKERY CHANNEL
TX
NOAA Chart: 11309 Latitude: 27° 38.0' N ( 27.63331)
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W ( -97.23669)
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.