U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 02/23/1994
Station ID: 8775792 SUPERCEDED DATE: 04/21/2003
Name: PACKERY CHANNEL, LAGUNA MADRE
TEXAS
NOAA Chart: 11309 Latitude: 27° 38.0' N
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W
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 10 miles (16 km) to a Y, turn or bear right at the Y on Park
Road 22 and continue SE for 4.3 miles (6.9 km) across the Intracoastal Waterway
on John F. Kennedy (JFK) Causeway/Bridge; turn immediately right under the
causeway to the north access road to Coastway Bait and Tackle Shop. The bench
marks are at the Bait and Tackle Shop and under the JFK Causeway/Bridge. The
tide gauge is on the east side of the Coastway Bait and Tackle Shop.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5792 A 1988
MONUMENTATION: Survey Disk VM#: 12210
AGENCY: PID#: AC8464
SETTING CLASSIFICATION: Stainless Steel Rod
The primary bench mark is at the most northerly NW corner of the parking lot at
the Coastway Bait and Tackle Shop, 293 feet (89 m) NE of the north face of the
north column of the tenth bridge support from the east end of the JFK Causeway,
53.5 feet (16.3 m) NW of the face of the SW timber piling, 30.8 feet (9.4 m)
west of the NW timber piling face, 5.5 feet (1.7 m) east of the west bulkhead
wall, and 2.0 feet (0.6 m) south of a witness post. The bench mark is 0.2 foot
(0.1 m) below the ground, crimped to a stainless steel rod driven 56 feet (17 m)
to substantial resistance, and encased in a 5-inch PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 5792 B 1988
MONUMENTATION: Survey Disk VM#: 12211
AGENCY: PID#: AC8465
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is 4.8 feet (1.5 m) from the west face of the center column of
the eleventh bridge support from the east end of the JFK Causeway, and 2.5 feet
(0.8 m) NNW of a witness post. The bench mark is 0.2 foot (0.1 m) below the
ground, crimped to a stainless steel rod driven 36 feet (11 m) 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 4
PUBLICATION DATE: 02/23/1994
Station ID: 8775792 SUPERCEDED DATE: 04/21/2003
Name: PACKERY CHANNEL, LAGUNA MADRE
TEXAS
NOAA Chart: 11309 Latitude: 27° 38.0' N
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5792 C 1988
MONUMENTATION: Survey Disk VM#: 12212
AGENCY: PID#: AC8463
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the concrete tie beam 1.6 feet (0.5 m) north of
the north face of the center column of the seventh bridge support from the east
end of the JFK Causeway, 3.0 feet (0.9 m) NE of a witness post, and 1.6 feet
(0.5 m) above the ground.
BENCH MARK STAMPING: 5792 D 1988
MONUMENTATION: Survey Disk VM#: 12213
AGENCY: PID#: AC8462
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is 4.0 feet (1.2 m) south of the south face of the south column
of the first bridge support from the east end of the JFK Causeway, and 3.5 feet
(1.1 m) SE of a witness post. The bench mark is 0.2 foot (0.1 m) below the
ground, crimped to a stainless steel rod driven 60 feet (18 m) to substantial
resistance, and encased in a 5-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 5792 E 1988
MONUMENTATION: Survey Disk VM#: 12214
AGENCY: PID#: AC8466
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the concrete tie beam 0.8 foot (0.2 m) north of
the north face of the south column of the fifteenth bridge support from the east
end of the JFK Causeway, 3.8 feet (1.2 m) SSW of a witness post, and 2.5 feet
(0.8 m) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 02/23/1994
Station ID: 8775792 SUPERCEDED DATE: 04/21/2003
Name: PACKERY CHANNEL, LAGUNA MADRE
TEXAS
NOAA Chart: 11309 Latitude: 27° 38.0' N
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W
T I D A L D A T U M S
Tidal datums at PACKERY CHANNEL, LAGUNA MADRE based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: SEPTEMBER 1992 - AUGUST 1993
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8774770 ROCKPORT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (06/20/1993) = 2.22
MEAN HIGHER HIGH WATER MHHW = 0.37
MEAN HIGH WATER MHW = 0.37
MEAN TIDE LEVEL MTL = 0.19
MEAN LOW WATER MLW = 0.01
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (12/28/1989) = -1.04
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
5792 A 1988 2.63 2.26
5792 B 1988 2.57 2.20
5792 C 1988 4.62 4.25
5792 D 1988 2.32 1.95
5792 E 1988 5.11 4.74
Foot Notes:
Tidal datums at Packery Channel have been computed using a 1-year series. Since
seasonal variations have a strong influence on water level variations in the
Laguna Madre region, tidal datums are based on a minimum 1-year series. Tidal
datums will be periodically updated as longer series become available.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 02/23/1994
Station ID: 8775792 SUPERCEDED DATE: 04/21/2003
Name: PACKERY CHANNEL, LAGUNA MADRE
TEXAS
NOAA Chart: 11309 Latitude: 27° 38.0' N
USGS Quad: CRANE ISLANDS NW Longitude: 97° 14.2' W
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 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.