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Datums Page Page 1 of 7
Station ID: 8761402 PUBLICATION DATE: 02/24/2015
Name: U.S. HIGHWAY 90, THE RIGOLETS
LA
NOAA Chart: 11371 Latitude: 30° 10.0' N ( 30.16670)
USGS Quad: RIGOLETS Longitude: 89° 44.2' W ( -89.73670)
To reach the tidal bench marks from the intersection of U.S. Highways 90 and 190
SE of Slidell, proceed SW on U.S. Highway 90 for 9.3 km (5.8 mi) to the SW end
of the bridge over The Rigolets. The bench marks are off both sides of the SW
end of the bridge. The tide gauge is located on the seawall at hte marina on the
W side of the bridge along Hospital Rd.
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 7
Station ID: 8761402 PUBLICATION DATE: 02/24/2015
Name: U.S. HIGHWAY 90, THE RIGOLETS
LA
NOAA Chart: 11371 Latitude: 30° 10.0' N ( 30.16670)
USGS Quad: RIGOLETS Longitude: 89° 44.2' W ( -89.73670)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: PIKE NO 3 1952
DESIGNATION: PIKE RM 3
MONUMENTATION: Reference Mark disk VM#: 7156
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BH1160
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 30° 10.0' N ( 30.16656) LONGITUDE: 89° 44.3' W ( -89.73761)
The primary bench mark is a disk set flush near the center of a 4m (13.1 ft)
square concrete pad (former beacon light base) 35.70 m (117.1 ft) SW of SW
corner of the visitor information booth, 24.24 m (79.5 ft) SSE of the north most
of two fixed cannons along NW fence line of Fort Pike Park, 12.08 m (39.6 ft) NW
of power pole 724 580, 2.95 m (9.6 ft) north of south corner of concrete pad,
2.95 m (9.6 ft) east of east corner of concrete pad and flush with grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8761402 PUBLICATION DATE: 02/24/2015
Name: U.S. HIGHWAY 90, THE RIGOLETS
LA
NOAA Chart: 11371 Latitude: 30° 10.0' N ( 30.16670)
USGS Quad: RIGOLETS Longitude: 89° 44.2' W ( -89.73670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PIKE 1931 1952
DESIGNATION: PIKE RESET
MONUMENTATION: Triangulation Station disk VM#: 7155
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BH1164
SETTING CLASSIFICATION: Concrete monument OPUS PID#: BH1164
LATITUDE: 30° 10.0' N ( 30.16656) LONGITUDE: 89° 44.2' W ( -89.73742)
The bench mark is a disk set flush in a concrete monument near the foot path
across the moat to Fort Pike, 25.59 m (83.9 ft) NNE of power pole 724 580, 24.01
m (78.7 ft) east of the north most of two fixed cannons along NW fence line of
Fort Pike Park, 18.20 m (59.7 ft) SSW of the SW corner of the visitor
information booth and flush with grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8761402 PUBLICATION DATE: 02/24/2015
Name: U.S. HIGHWAY 90, THE RIGOLETS
LA
NOAA Chart: 11371 Latitude: 30° 10.0' N ( 30.16670)
USGS Quad: RIGOLETS Longitude: 89° 44.2' W ( -89.73670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PIKE1931 1952 NO4 1966
DESIGNATION: PIKE RM 4
MONUMENTATION: Reference Mark disk VM#: 21277
AGENCY: US Coast and Geodetic Survey IDB PID#: BH1165
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 10.0' N ( 30.16683) LONGITUDE: 89° 44.2' W ( -89.73739)
The bench mark is a disk set flush in a concrete monument N of the foot path
across the moat of Fort Pike, 43.95 m (144.1 ft) N of the centerline of the
start of the below grade foot path across the moat to Fort Pike, 16.43 m (53.9
ft) NNE of the SW corner of the visitor information booth 1.22 m (4.0 ft) NE of
the center of power pole 725 580A and flush with grade.
BENCH MARK STAMPING: 1402 A 2014
DESIGNATION: 876 1402 A
MONUMENTATION: Tidal Station disk VM#: 21278
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID#: BBDR24
LATITUDE: 30° 9.9' N ( 30.16511) LONGITUDE: 89° 44.4' W ( -89.73975)
The bench mark is set flush in the west wing wall of the abutment on the south
side of the Highway 90 Bridge across The Rigolets, 57.55 m (188.8 ft) east of
the seawall along the east side of channel of marina, 50.42 m (165.4 ft) NE of
power pole 25300, 32.17 m (105.5 ft) NNE of the south end of metal and wood
highway guard rail, 9.83 m (32.2 ft) west of centerline of highway at south edge
of bridge concrete, 0.97 m (3.1 ft) west of south end of all metal bridge guard
rail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8761402 PUBLICATION DATE: 02/24/2015
Name: U.S. HIGHWAY 90, THE RIGOLETS
LA
NOAA Chart: 11371 Latitude: 30° 10.0' N ( 30.16670)
USGS Quad: RIGOLETS Longitude: 89° 44.2' W ( -89.73670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1402 B 2014
DESIGNATION: 876 1402 B
ALIAS:
MONUMENTATION: Tidal Station disk VM#: 21279
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete stair OPUS PID:
LATITUDE: 30° 10.0' N ( 30.16661) LONGITUDE: 89° 44.4' W ( -89.74017)
The bench mark is a disk set flush in the south end of the second step down of
the concrete stairs cast into the SW side of the boat ramp on the north end of
the marina just west of the Highway 90 Bridge over The Rigolets, 79.39 m (260.4
ft) NE of the center of the NW end of the boat haul out Travel Lift slip, 22.23
m (72.9 ft) south of the corner of the sheet pile seawall where the SW to NE
channel meets the SE to NW boat ramp cut out, 7.01 m (22.9 ft) west of the
center of the top of the boat ramp, 1.66 m (5.4 ft) south of the SE end of the
sheet pile seawall along SW side of the boat ramp cut out 1.37 m (4.4 ft) SE of
NW end edge of stairs and 0.13 m (0.4 ft)below level of concrete of fuel dock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8761402 PUBLICATION DATE: 02/24/2015
Name: U.S. HIGHWAY 90, THE RIGOLETS
LA
NOAA Chart: 11371 Latitude: 30° 10.0' N ( 30.16670)
USGS Quad: RIGOLETS Longitude: 89° 44.2' W ( -89.73670)
T I D A L D A T U M S
Tidal datums at U.S. HIGHWAY 90, THE RIGOLETS based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: October 2014 - October 2014
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8761927 USCG NEW CANAL STA., LAKE PONTCHARTRAIN
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.220
MEAN HIGH WATER MHW = 0.214
MEAN SEA LEVEL MSL = 0.119
MEAN TIDE LEVEL MTL = 0.113
MEAN LOW WATER MLW = 0.012
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
PIKE NO 3 1952 2.863 2.649
PIKE 1931 1952 2.555 2.341
PIKE1931 1952 NO4 1966 2.712 2.498
1402 A 2014 3.146 2.932
1402 B 2014 1.369 1.155
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8761402 PUBLICATION DATE: 02/24/2015
Name: U.S. HIGHWAY 90, THE RIGOLETS
LA
NOAA Chart: 11371 Latitude: 30° 10.0' N ( 30.16670)
USGS Quad: RIGOLETS Longitude: 89° 44.2' W ( -89.73670)
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
