U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8739803 PUBLICATION DATE: 12/17/2019
Name: STATE HIGHWAY 188 BRIDGE, BAYOU LA BATRE
AL
NOAA Chart: 11376 Latitude: 30° 24.3' N ( 30.40567)
USGS Quad: CODEN Longitude: 88° 14.9' W ( -88.24769)
To reach the benchmarks from coden, proceed north-northwest on rt 188 for 1.7
miles to bayou labatre lift bridge at bayou labtre, al . The benchmarks are
around the foot of the lift bridge. The tide gauge and sensor are located at the
northwest end of the same brigde.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9803 A 2011
DESIGNATION: 873 9803 A
MONUMENTATION: Flange-encased Rod VM#: 20290
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless Steel Rod OPUS PID#: BBCN87
LATITUDE: 30° 24.3' N ( 30.40450) LONGITUDE: 88° 15.0' W ( -88.24939)
The primary bench mark is a flange-encase rod is located 6.8 mi (11.0 km) south
of Saint Elmo, 1.6 mi (2.6 km) NNW of Coden and in the town of Bayou La Batre,
100.6 m (330.0 ft) WNW of the SW corner of St. Margaret's catholic church, 55.78
m (183.0 ft) west of west edge of church parking lot, 44.80 m (147.0 ft) west of
a six ft (1.8 m) wide oak tree, and 4.95 m (16.2 ft) east of a utility pole(no
number). The datum point is set 0.40 m below grade, being the top of a stainless
steel rod driven 12.20 m (40.0 ft) to substancial resistance, and encased in a
5-inch (13 cm) pvc pipe with no logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8739803 PUBLICATION DATE: 12/17/2019
Name: STATE HIGHWAY 188 BRIDGE, BAYOU LA BATRE
AL
NOAA Chart: 11376 Latitude: 30° 24.3' N ( 30.40567)
USGS Quad: CODEN Longitude: 88° 14.9' W ( -88.24769)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: P 511 2010
DESIGNATION: P 511
MONUMENTATION: Survey disk VM#: 20314
AGENCY: Alabama DOT IDB PID#: DN3582
SETTING CLASSIFICATION: Concrete Bulkhead OPUS PID:
LATITUDE: 30° 24.3' N ( 30.40536) LONGITUDE: 88° 14.9' W ( -88.24767)
The bench mark is a disk set on top of a concrete bulkhead, located about 6.8 mi
(10.9 km) south of Saint Elmo, 1.7 mi (2.7 km) NNW of Coden and in the town of
Bayou LaBatre, al, on the SE corner of Bayou LaBatre lift bridge, 44.92 m (147.4
ft) ENE of the NE corner of a brick building, 28.00 m (91.9 ft) ENE of a utility
pole numbered 5-139142, 9.94 m (32.6 ft) east of the centerline of Wintzell
avenue, and 2.08 m (6.6 ft) WSW of a utility pole numbered 5-139143. The bench
mark is set 0.2 m higher than the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8739803 PUBLICATION DATE: 12/17/2019
Name: STATE HIGHWAY 188 BRIDGE, BAYOU LA BATRE
AL
NOAA Chart: 11376 Latitude: 30° 24.3' N ( 30.40567)
USGS Quad: CODEN Longitude: 88° 14.9' W ( -88.24769)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: AL 21
DESIGNATION: AL 21
MONUMENTATION: Survey disk VM#: 20315
AGENCY: USACE IDB PID:
SETTING CLASSIFICATION: Concrete Bulkhead OPUS PID:
LATITUDE: 30° 24.4' N ( 30.40642) LONGITUDE: 88° 14.9' W ( -88.24789)
The bench mark is a disk set on top of a concrete bulkhead, located about 6.7 mi
(10.8 km) south of Saint Elmo, 1.7 mi (2.8 km) NNW of Coden and in the town of
Bayou LaBatre, al, on the NE corner of lift brdige at Bayou LaBatre, 68.49 m
(224.7 ft) south of a utility pole numbered spsk.6a 4-45, 44.90 m (147.3 ft) SSW
of theSWt corner of Ole Maria's Mexican Cuisine, 32.61 m (107.0 ft) ESE of a
utility pole numbered 5-139119, 10.03 m (32.9 ft) east of the centerline of
Wintzell Avenue. The disk is set flush with the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8739803 PUBLICATION DATE: 12/17/2019
Name: STATE HIGHWAY 188 BRIDGE, BAYOU LA BATRE
AL
NOAA Chart: 11376 Latitude: 30° 24.3' N ( 30.40567)
USGS Quad: CODEN Longitude: 88° 14.9' W ( -88.24769)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Z 10 1918 ELEV 9.629 FEET
DESIGNATION: Z 10
MONUMENTATION: Bench Mark disk VM#: 20316
AGENCY: USC&GS IDB PID#: BH0278
SETTING CLASSIFICATION: Brick Wall OPUS PID:
LATITUDE: 30° 24.2' N ( 30.40408) LONGITUDE: 88° 14.9' W ( -88.24819)
The bench mark is a disk set vertically on a brick wall on the southeast corner
of the St Margaret's Catholic Church, west of the side entrance, located 6.8 mi
(10.9 km) south of Saint Elmo, 1.7 mi (2.7 km) north-northwest of Coden and in
the town of Bayou LaBatre, al, 16.8 feet northwest of south corner of building,
2 1/2 feet northwest of an offset in the southwest face of building and 3 feet
above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8739803 PUBLICATION DATE: 12/17/2019
Name: STATE HIGHWAY 188 BRIDGE, BAYOU LA BATRE
AL
NOAA Chart: 11376 Latitude: 30° 24.3' N ( 30.40567)
USGS Quad: CODEN Longitude: 88° 14.9' W ( -88.24769)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: DON 84
DESIGNATION: DON 84
MONUMENTATION: Survey disk VM#: 20317
AGENCY: USACE IDB PID:
SETTING CLASSIFICATION: Concrete in PVC OPUS PID:
LATITUDE: 30° 24.3' N ( 30.40531) LONGITUDE: 88° 14.9' W ( -88.24783)
The benchmark is a disk set in top of the southwest corner of the lift bridge at
Bayou LaBatre, al, located 6.8 mi (11.0 km) south of Saint Elmo, 1.6 mi (2.6 km)
NNW of Coden and in the town of Bayou LaBatre, 30.70 m (100.7 ft) ENE of the NE
corner of a brick building, 18.50 m (60.7 ft) WSW of a utility pole numbered
5-139143, 17.70 m (58.1 ft) NNE of a utility pole numbered 5-139142, 8.50 m
(27.9 ft) west of the centerline of Wintzell Avenue. The bench mark is set 0.2 m
(0.7 ft) higher than the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8739803 PUBLICATION DATE: 12/17/2019
Name: STATE HIGHWAY 188 BRIDGE, BAYOU LA BATRE
AL
NOAA Chart: 11376 Latitude: 30° 24.3' N ( 30.40567)
USGS Quad: CODEN Longitude: 88° 14.9' W ( -88.24769)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: G 404 1955
DESIGNATION: G 404
MONUMENTATION: Bench Mark disk VM#: 20318
AGENCY: USC&GS IDB PID#: BH0277
SETTING CLASSIFICATION: Concrete Wall OPUS PID:
LATITUDE: 30° 23.8' N ( 30.39694) LONGITUDE: 88° 14.8' W ( -88.24692)
The bench mark is a disk set vertically on concrete wall located 6.8 mi (10.9
km) south of Saint Elmo, 1.7 mi (2.7 km) NNW of Coden and in the town of Bayou
LaBatre, al, 1.15 miles NW and north along a paved road from the bridge over
Bayou Coden at Coden, in the north face of Alba School building (yellow stone
building), 46.80 m (153.40 ft) west of the NW corner of a brick church, 32.80m
(107.5 ft) west of the centerline of right 188, 28.70 m (94.16 ft) SE of a
utility pole numbered 5-152399, 28.30 m (93.0 ft) south of the centerline of
alba st, 1 1/2 feet west of NE corner of building. The bench mark is set 0.60 m
(2.0 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8739803 PUBLICATION DATE: 12/17/2019
Name: STATE HIGHWAY 188 BRIDGE, BAYOU LA BATRE
AL
NOAA Chart: 11376 Latitude: 30° 24.3' N ( 30.40567)
USGS Quad: CODEN Longitude: 88° 14.9' W ( -88.24769)
T I D A L D A T U M S
Tidal datums at STATE HIGHWAY 188 BRIDGE, BAYOU LA BATRE based on:
LENGTH OF SERIES: 6 YEARS
TIME PERIOD: 12/01/11 - 11/30/12 , 07/01/13 - 06/30/18
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8741533 PASCAGOULA NOAA LAB, PASCAGOULA RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/08/2017) = 2.280
MEAN HIGHER HIGH WATER MHHW = 0.506
MEAN HIGH WATER MHW = 0.458
MEAN SEA LEVEL MSL = 0.251
MEAN TIDE LEVEL MTL = 0.250
North American Vertical Datum NAVD88 = 0.222
MEAN LOW WATER MLW = 0.042
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/30/2018) = -0.558
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9803 A 2011 1.847 1.389
P 511 2010 2.939 2.481
AL 21 2.288 1.830
Z 10 1918 ELEV 9.629 FEET 3.054 2.596
DON 84 3.050 2.592
G 404 1955 4.535 4.077
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8739803 PUBLICATION DATE: 12/17/2019
Name: STATE HIGHWAY 188 BRIDGE, BAYOU LA BATRE
AL
NOAA Chart: 11376 Latitude: 30° 24.3' N ( 30.40567)
USGS Quad: CODEN Longitude: 88° 14.9' W ( -88.24769)
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.