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.

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                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  9

                                                                                
Station ID: 8747437                         PUBLICATION DATE:  05/31/2017
Name:       BAY WAVELAND YACHT CLUB, BAY ST. LOUIS            
            MS
NOAA Chart: 11371                           Latitude:   30° 19.6' N (  30.32639)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 19.5' W ( -89.32578)


To reach the tidal bench marks from the intersection of U.S. Highway 90 and
North Beach Boulevard at the west end of the U.S. Highway 90 bridge over St.
Louis Bay, proceed 0.6 km (0.4 mi) north on North Beach Boulevard to Bay
Waveland Yacht Club.  The bench marks are located in the vicinity of the yacht
club and near U.S. Highway 90.  The tide gage is located offshore a few hundred
yards north of the yacht club, on the yellow pile.


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


                 PRIMARY BENCH MARK STAMPING:  7437 C 1978
                         DESIGNATION:          874 7437 C

MONUMENTATION:           Bench Mark disk                       VM#:          802
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Mass of conrete                       OPUS PID:        
LATITUDE:   30° 19.4' N (  30.32389)          LONGITUDE:  89° 19.7' W ( -89.32750)


The bench mark is a disk set next to a utility pole in a park directly across
the street from the yacht club, 15.70 m (51.51 ft) west of an old seawall corner
on the north side of the gate to the yacht club, and 7.62 m (25.00 ft) SW of the
centerline of North Beach Boulevard.  The bench mark is set 0.24 m (0.79 ft)
below ground level, crimped to the top of a stainless steel rod driven to an
unspecified depth, 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  9

                                                                                
Station ID: 8747437                         PUBLICATION DATE:  05/31/2017
Name:       BAY WAVELAND YACHT CLUB, BAY ST. LOUIS            
            MS
NOAA Chart: 11371                           Latitude:   30° 19.6' N (  30.32639)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 19.5' W ( -89.32578)


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


                         BENCH MARK STAMPING:  NO 2 1968
                         DESIGNATION:          874 7437 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:          799
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BH0936
SETTING CLASSIFICATION:  Concrete seawall                      OPUS PID:        
LATITUDE:   30° 19.4' N (  30.32389)          LONGITUDE:  89° 19.7' W ( -89.32750)


The bench mark is a disk set on the top at the SE end of a seawall, 114.60 m
(375.98 ft) SE of bench mark NO 1 1968, 11.06 m (36.29 ft) west of the south
corner of a steel fence around the Yacht Club, 5.49 m (18.01 ft) NE of the
centerline of the boulevard, 0.98 m (3.22 ft) NW of the seawall, and about level
with the boulevard.



                         BENCH MARK STAMPING:  7437 E 1991
                         DESIGNATION:          874 7437 E

MONUMENTATION:           Tidal Station disk                    VM#:         1808
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AB7179
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: AB7179
LATITUDE:   30° 19.5' N (  30.32444)          LONGITUDE:  89° 19.6' W ( -89.32694)


The bench mark is a disk located 39 m (128.0 ft) west of the SW corner of the
boat equipment storage shed, 32.31 m (106.00 ft) NW of the power pole at the
east end of the boat slips, 19.81 m (64.99 ft) east of the Marina Electric
Meter/Power Pole with light, 5.00 m (16.40 ft) north of a concrete parking lot
drainage basin, and 0.34 m (1.12 ft) south of the east-west concrete walkway
along the BWYC marina boat slips.  The bench mark is set 6 cm (0.2 ft) below the
ground, crimped to the top of a stainless steel rod driven 15.3 m ( 50.2 ft) to
refusal, and encased in a 6-inch DIA PVC surrounded by concrete.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  9

                                                                                
Station ID: 8747437                         PUBLICATION DATE:  05/31/2017
Name:       BAY WAVELAND YACHT CLUB, BAY ST. LOUIS            
            MS
NOAA Chart: 11371                           Latitude:   30° 19.6' N (  30.32639)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 19.5' W ( -89.32578)


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


                         BENCH MARK STAMPING:  7437 H 1991
                         DESIGNATION:          874 7437 H

MONUMENTATION:           Tidal Station disk                    VM#:         1811
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 19.3' N (  30.32150)          LONGITUDE:  89° 19.5' W ( -89.32522)


The bench mark is a disk located 336.0 m (1102.4 ft) south along North Beach
Drive from the centerline of the driveway entrance to the BWYC, 30.78 m (100.98
ft) north of power pole NO. 640, 16.76 m (54.99 ft) NW of a twin live oak tree,
10.79 m (35.40 ft) east of a fire hydrant, 6.98 m (22.90 ft) south of power pole
NO. 644, and 4.85 m (15.91 ft) east of the centerline of North Beach Drive.  The
bench mark is set 0.06 m (0.20 ft) below ground level, crimped to a stainless
steel rod driven 20.12 m (66.01 ft) to refusal, and encased in a 6-inch PVC pipe
and concrete kickblock.



                         BENCH MARK STAMPING:  7437 J 2008
                         DESIGNATION:          874 7437 J

MONUMENTATION:           Bench Mark disk                       VM#:        18831
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  BWYC concrete foundation              OPUS PID:        
LATITUDE:   30° 19.5' N (  30.32511)          LONGITUDE:  89° 19.5' W ( -89.32575)


The bench mark is a disk set flush in the NE corner of the Bay-Waveland Yacht
Club concrete foundation, 22 m (72.2 ft) west of the BWYC flagpole, 41 m (134.5
ft) SE of the bulkhead along the south side of the main basin, 37 m (121.4 ft)
NE of the BWYC entrance patio, 41 m (134.5 ft) NE of the SW corner of the BWYC
concrete foundation, 0.3 m (1.0 ft) west of the NE concrete foundation pillar of
the BWYC.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  9

                                                                                
Station ID: 8747437                         PUBLICATION DATE:  05/31/2017
Name:       BAY WAVELAND YACHT CLUB, BAY ST. LOUIS            
            MS
NOAA Chart: 11371                           Latitude:   30° 19.6' N (  30.32639)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 19.5' W ( -89.32578)


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


                         BENCH MARK STAMPING:  874 7437 SPIP 2008
                         DESIGNATION:          874 7437 SPIP

MONUMENTATION:           Bench Mark disk                       VM#:        18834
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Set in the top platform of the sentinal.OPUS PID:        
LATITUDE:   30° 19.6' N (  30.32636)          LONGITUDE:  89° 19.5' W ( -89.32578)


The bench mark is a disk set flush on top of the SE corner of the Davit Plate
located on the NW corner of the 3 x 3 m (9.8 ft) platform, 3.1 m (10.17 ft) NW
of the SW corner of the 3 x 3 m (9.8 ft) platform, 2.2 m (7.2 ft) NE of the SW
corner of the 3 x 3 m (9.8 ft) platform, 1.5 m (4.9 ft) SE of the NW corner of
the 3 x 3 m (9.8 ft) platform.



                         BENCH MARK STAMPING:  7437 K 2010
                         DESIGNATION:          874 7437 K

MONUMENTATION:           Flange-encased Rod                    VM#:        19737
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 19.3' N (  30.32231)          LONGITUDE:  89° 19.6' W ( -89.32597)


The bench mark is a flange-encased rod located 140.25 ft (42.74 m) NW of the
telephone pole number 646, 71.5 ft (21.79 m) WSW of the fire hydrant number
090061, 70.4 ft (21.45 m) SSE of the telephone pole number 645, 37.33 ft (11.37
m) SW of the telephone pole number 1099, and 34 ft (10.36 m) of the manhole
number 166, and 2 ft (0.60 m) west of a 3 inch (7.62 cm) PVC witness post.  The
datum point set 6 inches (15.24 cm) below the ground, being the top of a
stainless steel rod driven 89.9 ft (27.40 m) to refusal, and encased in a 5 inch
(12.7 cm) National Geodetic Survey logo cap.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  9

                                                                                
Station ID: 8747437                         PUBLICATION DATE:  05/31/2017
Name:       BAY WAVELAND YACHT CLUB, BAY ST. LOUIS            
            MS
NOAA Chart: 11371                           Latitude:   30° 19.6' N (  30.32639)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 19.5' W ( -89.32578)


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


                         BENCH MARK STAMPING:  7437 L 2010
                         DESIGNATION:          874 7437 L

MONUMENTATION:           Flange-encased Rod                    VM#:        19738
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   30° 19.5' N (  30.32436)          LONGITUDE:  89° 19.7' W ( -89.32806)


The bench mark is a flange-encased rod located 73 ft (22.25 m) ESE of a
telephone pole number 5-34, 52.25 ft (15.92 m) SSW of a telephone pole number
698, 27 ft (8.22 m) SSW of the centerline of north beach boulevard, 12 ft (3.65
m) north of a telephone pole number 5-35, 8.52 ft (2.59 m) SSW of a seawall, and
2 ft (0.60 m) SW of a 3 inch PVC witness post.  The datum point is set 6 inches
(15.24 cm) below the ground, being the top of a stainless steel rod driven 89.9
ft (27.40 m) to refusal, and encased in 5 inch NGS logo cap.



                         BENCH MARK STAMPING:  7437 M 2010
                         DESIGNATION:          874 7437 M

MONUMENTATION:           Flange-encased Rod                    VM#:        19739
AGENCY:                  National Ocean Survey/Service (NOS)   IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   30° 19.5' N (  30.32536)          LONGITUDE:  89° 19.7' W ( -89.32900)


The bench mark is a flange-encased rod located 153.33 ft (46.7 m) north of a
fire hydrant number 454310, 126.5 ft (38.55 m) east of a telephone pole number
710, 54.5 ft (16.6 m) NE of a telephone pole number 4-40, 28.5 ft (8.68 m) NE of
the centerline of north beach boulevard, 11.5 ft (3.50 m) NE of the top step of
the seawall, and 2 ft (0.60 m) SW of a 3 inch (7.62 cm) PVC witness post.  The
datum point is set 6 inches (15.24 cm) below the ground, being the top of a
stainless steel rod driven 89.7 ft (27.34 m) to refusal, and encased in a 5-inch
 (12.7 cm) National Geodetic Survey logo cap.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  9

                                                                                
Station ID: 8747437                         PUBLICATION DATE:  05/31/2017
Name:       BAY WAVELAND YACHT CLUB, BAY ST. LOUIS            
            MS
NOAA Chart: 11371                           Latitude:   30° 19.6' N (  30.32639)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 19.5' W ( -89.32578)


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


                         BENCH MARK STAMPING:  90 23 4
                         DESIGNATION:          MSDOT

MONUMENTATION:           Bench Mark disk                       VM#:        19740
AGENCY:                  Mississippi Department of TransportationIDB PID#:        
SETTING CLASSIFICATION:  Seawall                               OPUS PID:        
LATITUDE:   30° 19.5' N (  30.32464)          LONGITUDE:  89° 19.7' W ( -89.32847)


The bench mark is a disk set in a concrete seawall near the entrance to the Bay
Waveland Yacht Club, 69.3 ft (21.2 M) north of a power line pole numbered 5-45,
65.5 ft (19.96 M) NE of a fire hydrant, 58.5 ft (17.8 M) SE of a power line pole
numbered 4-40, 18 ft (5.48 M) NE of the centerline of north beach boulevard and
6 ft (1.82 M) SW of the NE side seawall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  9

                                                                                
Station ID: 8747437                         PUBLICATION DATE:  05/31/2017
Name:       BAY WAVELAND YACHT CLUB, BAY ST. LOUIS            
            MS
NOAA Chart: 11371                           Latitude:   30° 19.6' N (  30.32639)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 19.5' W ( -89.32578)


                            T I D A L   D A T U M S 


Tidal datums at BAY WAVELAND YACHT CLUB, BAY ST. LOUIS based on:

     LENGTH OF SERIES:      7 YEARS
     TIME PERIOD:           July 2006 - June 2011 & Jan 2014 - Dec 2015
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8729840 PENSACOLA, PENSACOLA BAY


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     HIGHEST OBSERVED WATER LEVEL (09/01/2008)         =  3.312
     MEAN HIGHER HIGH WATER                     MHHW   =  0.539
     MEAN HIGH WATER                            MHW    =  0.499
     MEAN SEA LEVEL                             MSL    =  0.272
     MEAN TIDE LEVEL                            MTL    =  0.271
     North American Vertical Datum              NAVD88 =  0.213
     MEAN LOW WATER                             MLW    =  0.042
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (09/02/1985)         = -1.218

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7437 C 1978                                 1.643    1.144
     NO 2 1968                                   2.489    1.990
     7437 E 1991                                 1.208    0.709
     7437 H 1991                                 3.470    2.971
     7437 J 2008                                 1.815    1.316
     874 7437 SPIP 2008                          7.753    7.254
     7437 K 2010                                 3.005    2.506
     7437 L 2010                                 1.289    0.790
     7437 M 2010                                 0.937    0.438
     90 23 4                                     1.869    1.370

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  9

                                                                                
Station ID: 8747437                         PUBLICATION DATE:  05/31/2017
Name:       BAY WAVELAND YACHT CLUB, BAY ST. LOUIS            
            MS
NOAA Chart: 11371                           Latitude:   30° 19.6' N (  30.32639)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 19.5' W ( -89.32578)


Foot Notes:

Bench mark 7437 K 2010 is based on one differential leveling connection and does
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for this mark.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  9 of  9

                                                                                
Station ID: 8747437                         PUBLICATION DATE:  05/31/2017
Name:       BAY WAVELAND YACHT CLUB, BAY ST. LOUIS            
            MS
NOAA Chart: 11371                           Latitude:   30° 19.6' N (  30.32639)
USGS Quad:  BAY ST. LOUIS                   Longitude:  89° 19.5' W ( -89.32578)


                             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.