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Datums Page Page 1 of 5
Station ID: 8770501 PUBLICATION DATE: 02/14/2011
Name: ANNIE'S LANDING, SAN JACINTO RIVER
TX
NOAA Chart: 11326 Latitude: 29° 49.1' N ( 29.81830)
USGS Quad: HIGHLANDS Longitude: 95° 4.7' W ( -95.07830)
To reach the tidal bench marks from the Highlands Post Office, travel north on
Crosby-Lynchburg Road for 0.8 km (0.5 mi), turn left onto Clear Lake Road and
continue westward for 1.5 km ( 0.9 mi), turn right on a dirt road, marked by a
sign for Tugboat Annie's Marina, continue on dirt road for 0.2 km (0.1 mi) to
Annie's Landing at end of road. The bench marks are located in the general
vicinity. The gage and staff were located on a pier approximately 15 m (49 ft)
offshore.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0501 A 1995
DESIGNATION: 877 0501 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 13858
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 29° 49.1' N ( 29.81830) LONGITUDE: 95° 4.7' W ( -95.07830)
The primary bench mark is a disk set flush in a concrete pad 22 m (72 ft) due
west from the SW corner of Annie's Marina building (tavern portion), 3 m (10 ft)
south of the north edge of the concrete pad, and 0.55 m (1.8 ft) east of west
edge of the pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8770501 PUBLICATION DATE: 02/14/2011
Name: ANNIE'S LANDING, SAN JACINTO RIVER
TX
NOAA Chart: 11326 Latitude: 29° 49.1' N ( 29.81830)
USGS Quad: HIGHLANDS Longitude: 95° 4.7' W ( -95.07830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0501 B 1995
DESIGNATION: 877 0501 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 13859
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete ramp OPUS PID:
LATITUDE: 29° 49.1' N ( 29.81830) LONGITUDE: 95° 4.7' W ( -95.07830)
The bench mark is a disk set flush in a concrete boat ramp 31 m (102 ft) NNW of
the utility pole in the middle of a parking lot, 38 m (125 ft) due north of the
SW corner of Annie's Marina building, 4 m (12 ft) due north of the most
northeasterly pine tree that has wire rope growing within the tree.
BENCH MARK STAMPING: 0501 C 1995
DESIGNATION: 877 0501 C TTIDAL
MONUMENTATION: Tidal Station disk VM#: 13860
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 29° 49.1' N ( 29.81830) LONGITUDE: 95° 4.7' W ( -95.07830)
The bench mark is a disk set flush in a concrete pad situated between the tavern
and storage sections of Annie's Marina building, 14.48 m (47.5 ft) SSE of the
utility pole in the middle of the parking lot, 2.53 m (8.3 ft) west of the NE
corner of the tavern portion of building, 2.74 m (9.0 ft) SE of the NW corner of
storage section of building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8770501 PUBLICATION DATE: 02/14/2011
Name: ANNIE'S LANDING, SAN JACINTO RIVER
TX
NOAA Chart: 11326 Latitude: 29° 49.1' N ( 29.81830)
USGS Quad: HIGHLANDS Longitude: 95° 4.7' W ( -95.07830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0501 D 1995
DESIGNATION: 877 0501 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 13861
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad/sidewalk OPUS PID:
LATITUDE: 29° 49.1' N ( 29.81830) LONGITUDE: 95° 4.7' W ( -95.07830)
The bench mark is a disk set flush in a concrete sidewalk 19.05 m (62.5 ft) SSE
of a utility pole located at the NE corner of Annie's tavern, 3.60 m (11.8 ft)
SE of the exterior corner of the women's restroom, 1.37 m (4.5 ft) NE of the NE
support post (4 x 4) of covered pavilion.
BENCH MARK STAMPING: 0501 E 1995
DESIGNATION: 877 0501 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 13862
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 29° 49.1' N ( 29.81830) LONGITUDE: 95° 4.7' W ( -95.07830)
The bench mark is a disk set flush in a concrete pad 19 m (62 ft) SW of the NW
corner of the boat barn, 1.37 m (4.5 ft) NW of the boat barn door post, and 0.52
m (1.7 ft) south of the north edge of the concrete pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8770501 PUBLICATION DATE: 02/14/2011
Name: ANNIE'S LANDING, SAN JACINTO RIVER
TX
NOAA Chart: 11326 Latitude: 29° 49.1' N ( 29.81830)
USGS Quad: HIGHLANDS Longitude: 95° 4.7' W ( -95.07830)
T I D A L D A T U M S
Tidal datums at ANNIE'S LANDING, SAN JACINTO RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: June 1995 - August 1995
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8770613 MORGANS POINT, BARBOURS CUT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.484
MEAN HIGH WATER MHW = 0.459
MEAN TIDE LEVEL MTL = 0.267
MEAN SEA LEVEL MSL = 0.266
MEAN LOW WATER MLW = 0.075
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0501 A 1995 1.801 1.342
0501 B 1995 1.021 0.562
0501 C 1995 1.752 1.293
0501 D 1995 1.639 1.180
0501 E 1995 1.892 1.433
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8770501 PUBLICATION DATE: 02/14/2011
Name: ANNIE'S LANDING, SAN JACINTO RIVER
TX
NOAA Chart: 11326 Latitude: 29° 49.1' N ( 29.81830)
USGS Quad: HIGHLANDS Longitude: 95° 4.7' W ( -95.07830)
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.
Station Location
Published bench mark
Unpublished bench mark
