U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8747131 PUBLICATION DATE: 02/26/2004
Name: MALLINI BAYOU NORTH
MS
NOAA Chart: 11371 Latitude: 30° 19.6' N ( 30.32670)
USGS Quad: BAY ST. LOUIS Longitude: 89° 17.3' W ( -89.28830)
To reach the tidal bench marks from the intersection of Ponce De Leon Boulevard
and U.S. Highway 90 near the east end of the U.S. 90 bridge over St. Louis Bay,
proceed 1.3 km (0.8 mi) north on Ponce De Leon Boulevard to its intersection
with Magnolia Lane, then 0.2 km (0.1 mi) east on Magnolia Lane to house #308,
the McQueen residence. The tide gage and staff were located on the south side
of the McQueens private dock on the north bank of Mallini Bayou.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7131 A 1978
DESIGNATION: 874 7131 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 10426
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 19.6' N ( 30.32670) LONGITUDE: 89° 17.3' W ( -89.28830)
The primary bench mark is a disk located in the backyard of the McQueen
residence, 11.40 m (37.4 ft) south of the SE corner of the house, 5.46 m (17.9
ft) north of a bulkhead on Mallini Bayou, and 0.79 m (2.6 ft) west of the east
property line of the McQueen residence. The bench mark is set 12 cm (0.4 ft)
below ground level, crimped to the top of a steel rod driven 18.3 m (60 ft) to
refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8747131 PUBLICATION DATE: 02/26/2004
Name: MALLINI BAYOU NORTH
MS
NOAA Chart: 11371 Latitude: 30° 19.6' N ( 30.32670)
USGS Quad: BAY ST. LOUIS Longitude: 89° 17.3' W ( -89.28830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7131 B 1978
DESIGNATION: 874 7131 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 10427
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Driveway OPUS PID:
LATITUDE: 30° 19.6' N ( 30.32670) LONGITUDE: 89° 17.3' W ( -89.28830)
The bench mark is a disk set flush near the east edge of the McQueens driveway,
33 m (109 ft) north of bench mark 7131A 1978, 13 m (44 ft) SE of the centerline
of Magnolia Lane, 8.78 m (28.8 ft) SSW of power pole #568,GP,VO,LR,FT,640, and
8.66 m (28.4 ft) north of the NE corner of the McQueen residence.
BENCH MARK STAMPING: 7131 C 1978
DESIGNATION: 874 7131 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 10428
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 19.6' N ( 30.32670) LONGITUDE: 89° 17.3' W ( -89.28830)
The bench mark is a disk located 88 m (289 ft) west of bench mark 7131B 1978,
17.19 m (56.4 ft) NNE of the NE corner of the Fitzpatrick residence, 5 m (16 ft)
south of the centerline of Magnolia Lane, and 1.22 m (4.0 ft) east of power pole
#2,65,UO,LR,FT,440. The bench mark is set 12 cm (0.4 ft) below ground level,
crimped to the top of a steel rod driven 14.6 m (48 ft) to refusal, and encased
in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8747131 PUBLICATION DATE: 02/26/2004
Name: MALLINI BAYOU NORTH
MS
NOAA Chart: 11371 Latitude: 30° 19.6' N ( 30.32670)
USGS Quad: BAY ST. LOUIS Longitude: 89° 17.3' W ( -89.28830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7131 D 1978
DESIGNATION: 874 7131 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 10429
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 19.6' N ( 30.32670) LONGITUDE: 89° 17.3' W ( -89.28830)
The bench mark is a disk located 65 m (214 ft) west of bench mark 7131C 1978, 31
m (103 ft) ESE of the centerline intersection of Ponce De Leon Boulevard and
Magnolia Lane, 5 m (15 ft) south of the centerline of Magnolia Lane, and 0.52 m
(1.7 ft) NE of power pole #V.P.C.O.,65,GP,VO,LR,FT,640. The bench mark is set
12 cm (0.4 ft) below ground level, crimped to the top of a steel rod driven 14.6
m (48 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7131 E 1978
DESIGNATION: 874 7131 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 10430
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 30° 19.6' N ( 30.32670) LONGITUDE: 89° 17.3' W ( -89.28830)
The bench mark is a disk set flush in the NE corner of a concrete foundation at
the SW corner of the intersection of Ponce De Leon Boulevard and Magnolia Lane
(west), 85 m (278 ft) SW of bench mark 7131D 1978, 29 m (95 ft) SSW of the
centerline intersection of the two streets, 16 m (54 ft) south of the centerline
of Magnolia Lane, and 15.54 m (51.0 ft) SW of power pole #54,GF,UO,LR,FT,640.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8747131 PUBLICATION DATE: 02/26/2004
Name: MALLINI BAYOU NORTH
MS
NOAA Chart: 11371 Latitude: 30° 19.6' N ( 30.32670)
USGS Quad: BAY ST. LOUIS Longitude: 89° 17.3' W ( -89.28830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7145 D 1978
DESIGNATION: 874 7145 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 10431
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge OPUS PID:
LATITUDE: 30° 19.6' N ( 30.32670) LONGITUDE: 89° 17.3' W ( -89.28830)
The bench mark is a disk set flush on the west end of the concrete bridge over
Mallini Bayou on Bayview Street, 90 m (296 ft) WNW of bench mark 7145C 1978,
18.68 m (61.3 ft) SE of the SE corner of Barretts Marine building, and 3.51 m
(11.5 ft) north of the centerline of Bayview Street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8747131 PUBLICATION DATE: 02/26/2004
Name: MALLINI BAYOU NORTH
MS
NOAA Chart: 11371 Latitude: 30° 19.6' N ( 30.32670)
USGS Quad: BAY ST. LOUIS Longitude: 89° 17.3' W ( -89.28830)
T I D A L D A T U M S
Tidal datums at MALLINI BAYOU NORTH based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: November 1978 - January 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8747437 BAY WAVELAND YC, BAY ST. LOUIS
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.536
MEAN HIGH WATER MHW = 0.505
MEAN TIDE LEVEL MTL = 0.274
MEAN SEA LEVEL MSL = 0.271
MEAN LOW WATER MLW = 0.043
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7131 A 1978 1.692 1.187
7131 B 1978 2.222 1.717
7131 C 1978 1.488 0.983
7131 D 1978 1.377 0.872
7131 E 1978 1.804 1.299
7145 D 1978 2.759 2.254
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8747131 PUBLICATION DATE: 02/26/2004
Name: MALLINI BAYOU NORTH
MS
NOAA Chart: 11371 Latitude: 30° 19.6' N ( 30.32670)
USGS Quad: BAY ST. LOUIS Longitude: 89° 17.3' W ( -89.28830)
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.