U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
From public boat ramp in Intracoastal City, proceed by boat SW 7.6 km on the
Intracoastal Waterway to Schooner Bayou on the right, turn right and proceed
west 4.2 km to the USACE Schooner Bayou Control Structure. The water level
sensor will be on the center concrete structure between the two gates. The
bench marks are on the structures and land around the facility.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: PBM LOCK 2007
DESIGNATION: PBM LOCK 2007
MONUMENTATION: Survey disk VM#: 23231
AGENCY: US Army Corps of Engineers (USACE) IDB PID:
SETTING CLASSIFICATION: Concrete doundation OPUS PID#: BBDL36
LATITUDE: 29° 45.5' N ( 29.75772) LONGITUDE: 92° 15.8' W ( -92.26400)
The primary bench mark is a disk set in the concrete foundation of the southern
number 1 wing of the USACE Schooner Bayou control structure along the southern
shore of the Schooner Bayou Canal, 49.9 m (163.7 ft) WSW of the eastern end of
the number 1 wooden wing wall, 17.23 m (56.5 ft) NE of the NE corner of the old
generator building (presently used for storage), 14.37 m (47.1 ft) SE of the
gate hinge for gate number 1, 12.6 m (41.3 ft) ESE of the SE square concrete
pillar for the control house and 7.58 m (24.9 ft) NNW of southernmost post of
the Schooner Bayou sign.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: SCHOONER 1 2006
DESIGNATION: SCHOONER 1
MONUMENTATION: Tidal Station disk VM#: 23232
AGENCY: US Army Corps of Engineers (USACE) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 29° 45.4' N ( 29.75739) LONGITUDE: 92° 15.9' W ( -92.26494)
The bench mark is a disk set to the south of the USACE Schooner Bayou control
structure, in the old set of western locks on the east side of the north lock,
34.6 m (113.5 ft) south of the SE corner of a water well shed, 31.7 m (104.0 ft)
SSW of the SW corner of a concrete oil shed, 28.9 m (94.8 ft) west of the SW
corner of a boat house, 11.9 m (39.0 ft) NNE of the NE corner located on the
eastern edge of the southern lock and 11.54 m (37.9 ft) ESE of the western edge
of the concrete foundation the mark is set in.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: SCHOONER 2 2006
DESIGNATION: SCHOONER 2
MONUMENTATION: Tidal Station disk VM#: 23233
AGENCY: US Army Corps of Engineers (USACE) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID#: BBGQ34
LATITUDE: 29° 45.4' N ( 29.75728) LONGITUDE: 92° 15.8' W ( -92.26408)
The bench mark is a disk set to the south of the USACE Schooner Bayou control
structure, in the old set of eastern locks on the west side of the north lock,
37.8 m (124.0 ft) east of the SE corner of a boat house, 33.5 m (109.9 ft) south
of the SE corner of the old generator building (presently used for storage),
12.5 m (41.0 ft) NNE of bench mark Schooner 4, 11.6 m (38.1 ft) NNE of the NE
corner of the concrete foundation on the opposite side and 11.40 m (37.4 ft)
west of the south end of the concrete foundation.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: SCHOONER 3 2011
DESIGNATION: SCHOONER 3
MONUMENTATION: Tidal Station disk VM#: 23234
AGENCY: US Army Corps of Engineers (USACE) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 29° 45.4' N ( 29.75719) LONGITUDE: 92° 15.9' W ( -92.26497)
The bench mark is a disk set to the south of the USACE Schooner Bayou control
structure in the old set of western locks on the east side of the south lock,
40.5 m (132.9 ft) SW of the SW corner the main building, 21.9 m (71.9 ft) WSW of
the SW corner of a wooden dock, 12.1 m (39.7 ft) south of the eastern end of the
lock structure, 11.58 m (38.0 ft) east of the west end of the southern lock
structure, 6.65 m (21.8 ft) ENE of the south end of the lock structure where
sheet pile meets concrete and 0.91 m (3.0 ft) west of the eastern end of the
lock structure.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: SCHOONER 4 2011
DESIGNATION: SCHOONER 4
MONUMENTATION: Tidal Station disk VM#: 23235
AGENCY: US Army Corps of Engineers (USACE) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 29° 45.4' N ( 29.75719) LONGITUDE: 92° 15.9' W ( -92.26422)
The bench mark is a disk set to the south of the USACE Schooner Bayou control
structure, in the of the old set of eastern locks on the west side of the south
lock, 45.9 m (150.6 ft) south of the old generator building (presently used for
storage), 45.5 m (149.3 ft) north of a power pole, 38.1 m (125.0 ft) ESE of the
SE corner of a boat house, 12.2 m (40.0 ft) south of the concrete foundation on
the north side and 11.49 m (37.7 ft) west of the far eastern edge of the
concrete foundation the mark is set in.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: NO 21
MONUMENTATION: Tidal Station disk VM#: 23236
AGENCY: US Army Corps of Engineers (USACE) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 29° 45.5' N ( 29.75806) LONGITUDE: 92° 15.8' W ( -92.26408)
The bench mark is a disk is set in the concrete foundation on the on the SW
corner of the central structure of the USACE Schooner Bayou control structure in
the Schooner Bayou Canal, 16.08 m (52.8 ft) south of the northern end of the
concrete at the northern channel, 15.20 m (49.9 ft) south of a light pole on
northern side of central structure, 3.23 m (10.6 ft) WNW of a light pole on
southern side of central structure and 0.50 m (1.6 ft) ESE of the corner of the
handrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: NO 10
MONUMENTATION: Tidal Station disk VM#: 23237
AGENCY: US Army Corps of Engineers (USACE) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 29° 45.5' N ( 29.75817) LONGITUDE: 92° 15.8' W ( -92.26394)
The bench mark is a disk set in the concrete foundation on the northern side of
the central structure of the USACE Schooner Bayou control structure in the
Schooner Bayou Canal, 15.04 m (49.3 ft) NNE of the southern side of the central
structure as measured along the concrete path, 6.23 m (20.4 ft) east of the
western edge of the concrete and 1.08 m (3.5 ft) south of the northern side of
the concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Unstamped
DESIGNATION: Unstamped
MONUMENTATION: Tidal Station disk VM#: 23238
AGENCY: US Army Corps of Engineers (USACE) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 29° 45.5' N ( 29.75853) LONGITUDE: 92° 15.8' W ( -92.26406)
The bench mark is a disk set in the northern gate structure of the USACE
Schooner Bayou control structure along northern bank of Schooner Bayou Canal,
15.97 m (52.4 ft) NNW of the SW corner of the concrete on the eastern side of
the gate along the channel, 15.85 m (52.0 ft) NE of the SE corner of the
concrete at the western edge of the gate along the channel, 12.93 m (42.4 ft)
NNW of the NW corner of the cable and gear box for gate 4, 0.82 m (2.7 ft) south
of the inside corner of the concrete and 0.58 m (1.9 ft) north of the outside
edge of the handrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
T I D A L D A T U M S
Tidal datums at SCHOONER BAYOU based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: November 2019 - January 2020
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8767961 BULK TERMINAL #1
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.387
MEAN HIGH WATER MHW = 0.367
MEAN TIDE LEVEL MTL = 0.219
MEAN SEA LEVEL MSL = 0.189
North American Vertical Datum NAVD88 = 0.180
MEAN LOW WATER MLW = 0.072
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
PBM LOCK 2007 1.454 1.087
SCHOONER 1 2006 1.136 0.769
SCHOONER 2 2006 1.133 0.766
SCHOONER 3 2011 1.141 0.774
SCHOONER 4 2011 1.135 0.768
NO 21 1.462 1.095
NO 10 1.462 1.095
Unstamped 1.451 1.084
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 11 of 11
Station ID: 8765994 PUBLICATION DATE: 12/16/2020
Name: SCHOONER BAYOU
LA
NOAA Chart: 11349 Latitude: 29° 45.5' N ( 29.75806)
USGS Quad: FORKED ISLAND Longitude: 92° 15.8' W ( -92.26381)
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.