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Bench Mark Sheet for 8747739, JOURDAN RIVER ENTRANCE MS

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                                                
Station ID: 8747739                         PUBLICATION DATE:  03/09/2004
Name:       JOURDAN RIVER ENTRANCE                            
            MS
NOAA Chart: 11371                           Latitude:   30° 20.2' N (  30.33670)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 22.0' W ( -89.36670)


To reach the tidal bench marks from the intersection of Blue Meadow Road and
U.S. Highway 90 in Bay St. Louis, proceed NW on Blue Meadow Road for 2.6 km (1.6
mi) to an intersection, then turn right and proceed north on Harrison Road for
0.6 km (0.4 mi) to the end of the road.  The bench marks are located south of
the gage site along Harrison Road.The tide gage and staff were located on the
westernmost of several abandoned pilings NW of the end of Harrison Street.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  7739 A 1978
                         DESIGNATION:          874 7439 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10443
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 20.2' N (  30.33670)          LONGITUDE:  89° 22.0' W ( -89.36670)


The primary bench mark is a disk located on the Hilly property, 33 m (109 ft) SW
of the south bank of the Jourdan River, 3 m (9 ft) west of a driveway, and 0.3 m
(1 ft) NE of a fence line.  The bench mark is set 0.15 m (0.5 ft) below ground
level, crimped to the top of a stainless 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: 8747739                         PUBLICATION DATE:  03/09/2004
Name:       JOURDAN RIVER ENTRANCE                            
            MS
NOAA Chart: 11371                           Latitude:   30° 20.2' N (  30.33670)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 22.0' W ( -89.36670)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  7739 B 1978
                         DESIGNATION:          874 7439 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10444
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 20.2' N (  30.33670)          LONGITUDE:  89° 22.0' W ( -89.36670)


The bench mark is a disk located 64 m (211 ft) SE of bench mark 7739 A 1978,
30.63 m (100.5 ft) NW of the centerline of Harrison Road, and 19.81 m (65.0 ft)
west of power pole #CEPA-OP-UO-F-89-6P-OP.  The bench mark is set 0.15 m (0.5
ft) below ground level, crimped to the top of a stainless steel rod driven 11.0
m (36 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  7739 C 1978
                         DESIGNATION:          874 7439 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10445
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete driveway                     OPUS PID:        
LATITUDE:   30° 20.2' N (  30.33670)          LONGITUDE:  89° 22.0' W ( -89.36670)


The bench mark is a disk set flush in the concrete driveway in front of the
house, located 46.54 m (152.7 ft) east of bench mark 7739 B 1978, 14.63 m (48.0
ft) east of the centerline of Harrison Road, 8.44 m (27.7 ft) ENE of power pole
#CEPA-CP-PI-SPP, and 0.85 m (2.8 ft) west of the SW corner of a block house.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8747739                         PUBLICATION DATE:  03/09/2004
Name:       JOURDAN RIVER ENTRANCE                            
            MS
NOAA Chart: 11371                           Latitude:   30° 20.2' N (  30.33670)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 22.0' W ( -89.36670)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  7739 D 1978
                         DESIGNATION:          874 7439 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10446
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 20.2' N (  30.33670)          LONGITUDE:  89° 22.0' W ( -89.36670)


The bench mark is a disk located 66 m (215 ft) south of bench mark 7739 C 1978,
7 m (22 ft) east of the centerline of Harrison Road, 5 m (17 ft) north of the
centerline of the Smiths driveway, 0.70 m (2.3 ft) SW of power pole #11, and
0.52 m (1.7 ft) SE of the NW corner fence post of the Smiths property.  The
bench mark is set 12 cm (0.4 ft) below ground level, crimped to the top of a
stainless steel rod driven 16.5 m (54 ft) and encased in a 4-inch PVC pipe and
concrete kickblock.



                         BENCH MARK STAMPING:  7739 E 1978
                         DESIGNATION:          874 7439 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10447
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 20.2' N (  30.33670)          LONGITUDE:  89° 22.0' W ( -89.36670)


The bench mark is a disk located 92 m (301 ft) south of bench mark 7739 D 1978,
18 m (60 ft) WNW of the NW corner of a frame house, 7 m (23 ft) east of the
centerline of Harrison Road, and 0.46 m (1.5 ft) west of power pole #7.  The
bench mark is set 0.15 m (0.5 ft) below ground level, crimped to the top of a
stainless steel rod driven 16.5 m (54 ft) 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  4 of  6

                                                                                
Station ID: 8747739                         PUBLICATION DATE:  03/09/2004
Name:       JOURDAN RIVER ENTRANCE                            
            MS
NOAA Chart: 11371                           Latitude:   30° 20.2' N (  30.33670)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 22.0' W ( -89.36670)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  R 190 1955
                         DESIGNATION:          R 190

MONUMENTATION:           Bench Mark disk                       VM#:        10448
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:  BH0942
SETTING CLASSIFICATION:  Concrete culvert head wall            OPUS PID:        
LATITUDE:   30° 19.2' N (  30.32000)          LONGITUDE:  89° 20.5' W ( -89.34170)


The bench mark is a disk set on the top of the NE end of the NW concrete head
wall for a 1.83 m (6.0 ft) culvert under a service road and the highway, 27 m
(88 ft) NW of and across a service road from the center line of the westbound
lane of the highway, 6 m (21 ft) NW of the center line of the service road and 1
m (2 ft) below the level of the highway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8747739                         PUBLICATION DATE:  03/09/2004
Name:       JOURDAN RIVER ENTRANCE                            
            MS
NOAA Chart: 11371                           Latitude:   30° 20.2' N (  30.33670)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 22.0' W ( -89.36670)


                            T I D A L   D A T U M S 


Tidal datums at JOURDAN RIVER ENTRANCE 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   =  0.548
     MEAN HIGH WATER                            MHW    =  0.500
     MEAN SEA LEVEL                             MSL    =  0.278
     MEAN TIDE LEVEL                            MTL    =  0.274
     MEAN LOW WATER                             MLW    =  0.048
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7739 A 1978                                 0.862    0.362
     7739 B 1978                                 1.014    0.514
     7739 C 1978                                 2.014    1.514
     7739 D 1978                                 1.101    0.601
     7739 E 1978                                 1.365    0.865
     R 190 1955                                  3.974    3.474


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  6

                                                                                
Station ID: 8747739                         PUBLICATION DATE:  03/09/2004
Name:       JOURDAN RIVER ENTRANCE                            
            MS
NOAA Chart: 11371                           Latitude:   30° 20.2' N (  30.33670)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 22.0' W ( -89.36670)


                             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.

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Products available at 8747739 JOURDAN RIVER ENTRANCE, MS

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services