U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8775870 PUBLICATION DATE: 12/08/2020
Name: BOB HALL PIER, CORPUS CHRISTI
TX
NOAA Chart: 11307 Latitude: 27° 34.8' N ( 27.58000)
USGS Quad: CRANE ISLAND SW Longitude: 97° 13.0' W ( -97.21670)
To reach the tidal bench marks from the intersection of County Park Road 53 and
County Park Road 22 on North Padre Island, proceed south on County Park Road 22
for 3.4 km (2.1 miles) to Padre Balli Park, turn left on the park entrance road
and proceed east for 0.6 km (0.4 miles), turn right on the beach road and follow
this road for 0.5 km (0.3 miles) to Bob Hall Pier. The bench marks are at the
entrance to the park, on the pier, and in the park compound. The tide gage is
located on a platform at the NW corner of the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5870 K 1985
DESIGNATION: 877 5870 K TIDAL
ALIAS: 5870 K
MONUMENTATION: Tidal Station disk VM#: 893
AGENCY: National Ocean Service (NOS) IDB PID#: AC8461
SETTING CLASSIFICATION: Pile cap OPUS PID:
LATITUDE: 27° 34.9' N ( 27.58094) LONGITUDE: 97° 13.0' W ( -97.21653)
The primary bench mark is disk set flush in the top of a concrete pier pile cap
at the offshore end of Bob Hall Pier, 5.50 m (18.04 ft) WSW of the offshore end
of the pier, 3.81 m (12.5 ft) SSE of the north face of the pier, 1.31 m (4.3 ft)
NNE of the south face of the pier, and level with the surface of the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8775870 PUBLICATION DATE: 12/08/2020
Name: BOB HALL PIER, CORPUS CHRISTI
TX
NOAA Chart: 11307 Latitude: 27° 34.8' N ( 27.58000)
USGS Quad: CRANE ISLAND SW Longitude: 97° 13.0' W ( -97.21670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: HOLIDAY 1980
DESIGNATION: HOLIDAY AZ MK
ALIAS: Holiday 1980
MONUMENTATION: Azimuth Mark disk VM#: 885
AGENCY: National Geodetic Survey (NGS) IDB PID#: AH1214
SETTING CLASSIFICATION: Concrete monument OPUS PID#: AH1214
LATITUDE: 27° 35.2' N ( 27.58672) LONGITUDE: 97° 13.3' W ( -97.22122)
The bench mark is a disk set flush in the top of a concrete monument, located on
the south side of the entrance road to Padre Balli Park, 30.91 m (101.41 ft) WNW
of the centerline of Elliff Road, 11.31 m (37.1 ft) NE of Utility Pole 5, 4.91 m
(16.11 ft) SSW of the centerline of the entrance road, 3.51 m (11.52 ft) north
of a wooden pole with a metal pipe and shield marking the underground cable
route, and is in line with wooden posts and level with the surface of the
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8775870 PUBLICATION DATE: 12/08/2020
Name: BOB HALL PIER, CORPUS CHRISTI
TX
NOAA Chart: 11307 Latitude: 27° 34.8' N ( 27.58000)
USGS Quad: CRANE ISLAND SW Longitude: 97° 13.0' W ( -97.21670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5870 C 1983
DESIGNATION: 877 5870 C TIDAL
ALIAS: 5870 C
MONUMENTATION: Tidal Station disk VM#: 886
AGENCY: National Ocean Service (NOS) IDB PID#: AC8456
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID#: AC8456
LATITUDE: 27° 35.2' N ( 27.58625) LONGITUDE: 97° 13.2' W ( -97.22017)
The bench mark is a disk located in the Padre Balli Park compound at the end of
the park entrance road, 16.10 m (52.8 ft) north of the centerline of the road
leading to the beach, 14.30 m (46.9 ft) east of the centerline of the divider
street between the park entrance and exit roads, and 3.00 m (9.8 feet) east of
Light Pole 440. The bench mark is crimped to a galvanized steel rod driven 6.10
m (20.0 ft), into the ground and encased in a 4-inch PVC pipe and concrete
kickblock. NOTE: rod may not fit inside the PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8775870 PUBLICATION DATE: 12/08/2020
Name: BOB HALL PIER, CORPUS CHRISTI
TX
NOAA Chart: 11307 Latitude: 27° 34.8' N ( 27.58000)
USGS Quad: CRANE ISLAND SW Longitude: 97° 13.0' W ( -97.21670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5870 D 1983
DESIGNATION: 877 5870 D TIDAL
ALIAS: 5870 D 1983
MONUMENTATION: Tidal Station disk VM#: 887
AGENCY: National Ocean Service (NOS) IDB PID#: AC8455
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 27° 35.2' N ( 27.58703) LONGITUDE: 97° 13.3' W ( -97.22169)
The bench mark is a disk located on the Padre Balli Park compound in the median
between the park entrance and exit roads, 47.49 m (155.807 ft) south of the
centerline of the exit road, 16.00 m (52.49 ft) NNE of Utility Pole 4, and 5.61
m (18.4 ft) north of the centerline of the entrance road. The bench mark is set
an top a galvanized steel rod driven 5.80 m (19.03 ft), and encased in a 4-inch
PVC pipe and concrete kickblock. NOTE: rod may not fit inside the PVC pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8775870 PUBLICATION DATE: 12/08/2020
Name: BOB HALL PIER, CORPUS CHRISTI
TX
NOAA Chart: 11307 Latitude: 27° 34.8' N ( 27.58000)
USGS Quad: CRANE ISLAND SW Longitude: 97° 13.0' W ( -97.21670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5870 G 1985
DESIGNATION: 877 5870 G TIDAL
ALIAS: 5870 G
MONUMENTATION: Tidal Station disk VM#: 890
AGENCY: National Ocean Service (NOS) IDB PID#: AC8460
SETTING CLASSIFICATION: Pile cap OPUS PID:
LATITUDE: 27° 34.9' N ( 27.58215) LONGITUDE: 97° 13.2' W ( -97.21933)
The bench mark is a disk set flush in the top of a concrete pier pile cap at the
inshore end of Bob Hall Pier, 6.90 m (22.64 ft) ESE of a chain link fence gate,
5.91 m (19.39 ft) SE of the SE corner of the restrooms on the pier, 4.60 m
(15.09 ft) south of the north face of the pier, and level with the surface of
the pier.
BENCH MARK STAMPING: 5870 J 1985
DESIGNATION: 877 5870 J TIDAL
ALIAS: 5870 J
MONUMENTATION: Tidal Station disk VM#: 892
AGENCY: National Ocean Service (NOS) IDB PID#: AC8457
SETTING CLASSIFICATION: Concrete foundation OPUS PID#: AC8457
LATITUDE: 27° 35.0' N ( 27.58364) LONGITUDE: 97° 13.2' W ( -97.22014)
The bench mark is a disk set flush in the concrete foundation for the Waste
Disposal Station in the Padre Balli Park campground, 19.51 m (64.01 ft) SSW of
the end of the pavement at the north end of the campground, 14.00 m (45.93 ft)
SSE of Power Pole 202, 8.20 m (26.9 ft) WNW of the edge of the pavement at the
east end of the campground, and 0.21 m (0.69 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8775870 PUBLICATION DATE: 12/08/2020
Name: BOB HALL PIER, CORPUS CHRISTI
TX
NOAA Chart: 11307 Latitude: 27° 34.8' N ( 27.58000)
USGS Quad: CRANE ISLAND SW Longitude: 97° 13.0' W ( -97.21670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5870 L 2002
DESIGNATION: 877 5870 L
ALIAS: 5870 L
MONUMENTATION: Bench Mark disk VM#: 17361
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete picnic area OPUS PID:
LATITUDE: 27° 35.1' N ( 27.58431) LONGITUDE: 97° 13.2' W ( -97.22006)
The bench mark is a disk set in a concrete slab at the picnic area just south of
the ranger station located NW of Bob Hall Pier, 37.30 m (122.4 ft) ESE of the
centerline of the road leading to the RV park, 22.20 m (72.8 ft) SSW of the edge
of an asphalt parking lot of the visitors center, 21.70 m (71.2 ft) NNW of the
electric pole with a transformer marked "01".
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8775870 PUBLICATION DATE: 12/08/2020
Name: BOB HALL PIER, CORPUS CHRISTI
TX
NOAA Chart: 11307 Latitude: 27° 34.8' N ( 27.58000)
USGS Quad: CRANE ISLAND SW Longitude: 97° 13.0' W ( -97.21670)
T I D A L D A T U M S
Tidal datums at BOB HALL PIER, CORPUS CHRISTI based on:
LENGTH OF SERIES: 33 YEARS
TIME PERIOD: January 1986 - December 2018
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 (07/25/2020) = 2.066
MEAN HIGHER HIGH WATER MHHW = 0.499
MEAN HIGH WATER MHW = 0.470
MEAN SEA LEVEL MSL = 0.284
MEAN TIDE LEVEL MTL = 0.269
North American Vertical Datum NAVD88 = 0.153
MEAN LOW WATER MLW = 0.069
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/28/1984) = -0.825
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5870 K 1985 5.097 4.627
HOLIDAY 1980 2.092 1.622
5870 C 1983 1.918 1.448
5870 D 1983 2.064 1.594
5870 G 1985 5.725 5.255
5870 J 1985 2.722 2.252
5870 L 2002 2.430 1.960
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8775870 PUBLICATION DATE: 12/08/2020
Name: BOB HALL PIER, CORPUS CHRISTI
TX
NOAA Chart: 11307 Latitude: 27° 34.8' N ( 27.58000)
USGS Quad: CRANE ISLAND SW Longitude: 97° 13.0' W ( -97.21670)
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.