U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8766769 PUBLICATION DATE: 03/30/2021
Name: LAKE ARTHUR
LA
NOAA Chart: 11348 Latitude: 30° 4.4' N ( 30.07350)
USGS Quad: LAKE ARTHUR Longitude: 92° 40.6' W ( -92.67681)
From the US Post Office at 302 Kellogg Ave in Lake Arthur, proceed WSW 0.14 km
(0.1 mi) to the intersection with Arthur Ave, turn left and proceed south 0.3 km
(0.2 mi) to the end of the road and the beginning of the lakefront walkway. The
water level sensor will be at the SE corner of the walkway. The bench marks
will be along the lake front and along Hwy 14.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6769 B 2019
DESIGNATION: 876 6769 B
MONUMENTATION: Flange-encased Rod VM#: 23154
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBGQ41
LATITUDE: 30° 4.6' N ( 30.07586) LONGITUDE: 92° 40.6' W ( -92.67714)
The primary bench mark is a flange-encased rod set in a grassy median near the
southern end of Arthur Avenue, 22.29 m (73.1 ft) SE of a wooden light pole at
the corner of Lake St and Arthur St, 21.76 m (71.4 ft) NW of the SW corner of
the City Hall building, 20.05 m (65.8 ft) east of the NE corner of a concrete
welcome sign, 8.74 m (28.7 ft) south of the SE corner of the stone base for a
war memorial and 5.55 m (18.2 ft) NNW of metal utility pole. The datum point is
set 4 cm (2 inches) below ground, being the top of a stainless-steel rod,
encased in a 7.25-in (18 cm) NOS logo cap.
BENCH MARK STAMPING: 27V1 1968
DESIGNATION: 27 V 1 LADTD
MONUMENTATION: Survey disk VM#: 23151
AGENCY: US Coast and Geodetic Survey IDB PID#: BK0914
SETTING CLASSIFICATION: concree monument OPUS PID:
LATITUDE: 30° 4.5' N ( 30.07528) LONGITUDE: 92° 40.9' W ( -92.68167)
The bench mark is a disk set in concrete near a chain-link fence along the
southeast edge of a residential lot, 44 m (144 ft) south of a stop sign on an
access road on the NE side of highway 14, 38.6 m (126.6 ft) SE of a fire hydrant
near a chain link fence, 19.67 m (64.5 ft) west of the western corner of the
guard rail along the east-bound lane at the NW end of bridge and 2.36 m (7.7 ft)
south of a fencepost at the corner of the chain-link fence.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8766769 PUBLICATION DATE: 03/30/2021
Name: LAKE ARTHUR
LA
NOAA Chart: 11348 Latitude: 30° 4.4' N ( 30.07350)
USGS Quad: LAKE ARTHUR Longitude: 92° 40.6' W ( -92.67681)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 27V2 1968
DESIGNATION: 27 V 2 LADTD
MONUMENTATION: Survey disk VM#: 23152
AGENCY: US Coast and Geodetic Survey IDB PID#: BK0915
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 5.1' N ( 30.08458) LONGITUDE: 92° 40.3' W ( -92.67244)
The bench mark is a disk set in a concrete monument which is marked by a metal
witness post along the western side of highway 14, 34.1 m (111.9 ft) WNW of a
power pole on the east side of highway 14, 23.69 m (77.7 ft) NE of the NE corner
of a house, 16.60 m (54.5 ft) SE of the SE corner of a house and 6.66 m (21.9
ft) SW of a power pole on the west side of highway 14.
BENCH MARK STAMPING: 6769 A 2019
DESIGNATION: 876 6769 A
MONUMENTATION: Tidal Station disk VM#: 23153
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete footer OPUS PID:
LATITUDE: 30° 4.5' N ( 30.07522) LONGITUDE: 92° 40.6' W ( -92.67697)
The bench mark is a disk set in a 1 m x 1 m (3 ft x 3 ft) concrete footer of the
SW steel pavilion post, 54.10 m (177.5 ft) south of a utility pole on the SE
corner of Arthur Avenue, 21.19 m (69.5 ft) WSE of the outer edge of the SE steel
pavilion post, 17.65 m (57.9 ft) west of the eastern concrete pier and sheet
pile seawall intersection, 12.81 m (42.0 ft) east of a metal light pole and 3.17
m (10.4 ft) NNE of the outer edge of the steel cap over a sheet pile seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8766769 PUBLICATION DATE: 03/30/2021
Name: LAKE ARTHUR
LA
NOAA Chart: 11348 Latitude: 30° 4.4' N ( 30.07350)
USGS Quad: LAKE ARTHUR Longitude: 92° 40.6' W ( -92.67681)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6769 C 2019
DESIGNATION: 876 6769 C
MONUMENTATION: Flange-encased Rod VM#: 23155
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBGQ35
LATITUDE: 30° 4.4' N ( 30.07350) LONGITUDE: 92° 40.6' W ( -92.67681)
The bench mark is a flange-encased rod set in the grass along the western side
of a ballfield near the SE corner of New Orleans Avenue and Lake St, 59.93 m
(196.6 ft) south of a power pole at the SW corner of Lake St. and New Orleans
Avenue, 46.60 m (152.9 ft) SE of a fire hydrant, 46.25 m (151.7 ft) north of a
stop sign at the SE corner of Grand St and New Orleans Avenue, 5.90 m (19.4 ft)
WSE of the center of New Orleans Ave. and 4.62 m (15.2 ft) ENE of a chain-link
fence around the ballfield. The datum point is set 4 cm (2 inches) below the
ground, being the top of a stainless-steel rod driven 28.0 m (91.9 ft) and
encased in a 7.25-in (18 cm) NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8766769 PUBLICATION DATE: 03/30/2021
Name: LAKE ARTHUR
LA
NOAA Chart: 11348 Latitude: 30° 4.4' N ( 30.07350)
USGS Quad: LAKE ARTHUR Longitude: 92° 40.6' W ( -92.67681)
T I D A L D A T U M S
Tidal datums at LAKE ARTHUR based on:
LENGTH OF SERIES: 7 MONTHS
TIME PERIOD: November 2019 - May 2020
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8767816 LAKE CHARLES, CALCASIEU RIVER
Elevations of tidal datums referred to Mean Sea Level (MSL), in METERS:
North American Vertical Datum NAVD88 = 0.042
MEAN SEA LEVEL MSL = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MSL
6769 B 2019 1.750
27V1 1968 1.407
27V2 1968 2.592
6769 A 2019 1.339
6769 C 2019 1.097
Foot Notes:
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8766769 PUBLICATION DATE: 03/30/2021
Name: LAKE ARTHUR
LA
NOAA Chart: 11348 Latitude: 30° 4.4' N ( 30.07350)
USGS Quad: LAKE ARTHUR Longitude: 92° 40.6' W ( -92.67681)
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.