Bench Mark Sheet for 8767816, Lake Charles LA

Superseded Epoch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Small blue map location marker Unpublished bench mark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  7

                                                                                
Station ID: 8767816                         PUBLICATION DATE:  09/13/2017
Name:       LAKE CHARLES, CALCASIEU RIVER                     
            LA
NOAA Chart: 11347                           Latitude:   30° 13.4' N (  30.22364)
USGS Quad:  CALCASIEU                       Longitude:  93° 13.3' W ( -93.22167)


To reach the tidal bench marks from I-10 heading east, take exit 29, Lakeshore
Drive/Downtown, follow Lakeshore Drive which leads directly to the Civic Center,
then turn west on Bord du Lac Drive and follow it around to the SE area of the
Civic Center property. The bench marks are in the vicinity of the waterfront,
Bord du Lac Drive, and North Lakeshore Drive. The tide gauge was located on a
small dock near the SE corner of Lake Charles.


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


                 PRIMARY BENCH MARK STAMPING:  A 269 1972
                         DESIGNATION:          A 269

MONUMENTATION:           Bench Mark disk                       VM#:        16850
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BK1489
SETTING CLASSIFICATION:  Flood wall                            OPUS PID:        
LATITUDE:   30° 13.4' N (  30.22406)          LONGITUDE:  93° 13.3' W ( -93.22142)


The primary bench mark is a disk set in the top of a concrete flood wall
supporting a pipe guard rail located 42.4 m (139.10 ft) west of the center of
Lake Shore Drive, 31.40 m (103.0 ft) south of the center of west Clarence
Street, 0.60 m (2.0 ft) west of the east end of the flood wall, 0.12 m (0.39 ft)
north of the pipe railing and about level with the highway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8767816                         PUBLICATION DATE:  09/13/2017
Name:       LAKE CHARLES, CALCASIEU RIVER                     
            LA
NOAA Chart: 11347                           Latitude:   30° 13.4' N (  30.22364)
USGS Quad:  CALCASIEU                       Longitude:  93° 13.3' W ( -93.22167)


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


                         BENCH MARK STAMPING:  4 1955
                         DESIGNATION:          876 7816 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:        16852
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BK1491
SETTING CLASSIFICATION:  Walkway                               OPUS PID:        
LATITUDE:   30° 13.4' N (  30.22364)          LONGITUDE:  93° 13.3' W ( -93.22128)


The bench mark is a disk set in the top of the south end of the west concrete
walkway of a bridge over a canal 45.75 m (150.10 ft) SE of bench mark A 269,
4.72 m (15.49 ft) west of the center of the highway, 0.6 m (1.968 ft) east of
the south end of the west guard rail, 0.27 m (0.89 ft) north of the south end of
the walkway, and about 0.3 m (0.98 ft) above the level of the highway.



                         BENCH MARK STAMPING:  NO 5 1973
                         DESIGNATION:          876 7816 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:        16853
AGENCY:                  National Ocean Survey/service (NOS)   IDB PID#:  BK2269
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID:        
LATITUDE:   30° 13.4' N (  30.22378)          LONGITUDE:  93° 13.3' W ( -93.22119)


The bench mark is a disk set in the top of the west end of the north retaining
wall of a bridge over a canal, 6.40 m (21.00 ft) west of the centerline of Front
Street and 0.43 m (1.41 ft) west of the NW corner of a concrete guard rail, and
0.30 m (0.98 ft) above the road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8767816                         PUBLICATION DATE:  09/13/2017
Name:       LAKE CHARLES, CALCASIEU RIVER                     
            LA
NOAA Chart: 11347                           Latitude:   30° 13.4' N (  30.22364)
USGS Quad:  CALCASIEU                       Longitude:  93° 13.3' W ( -93.22167)


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


                         BENCH MARK STAMPING:  BM NO 7 1988
                         DESIGNATION:          876 7816 TIDAL 7

MONUMENTATION:           Tidal Station disk                    VM#:        16854
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete bulkhead                     OPUS PID:        
LATITUDE:   30° 13.5' N (  30.22461)          LONGITUDE:  93° 13.4' W ( -93.22258)


The bench mark is a disk set flush in the southern section of the Civic Center
Park, 207.20 m (679.79 ft) west of the intersection of Lakeshore Drive and Bord
Du Lac Drive, 17.68 m (58.01 ft) south of the south curb of the public parking
area, 9.75 m (31.99 ft) SW of an electrical box, 2.13 m (6.988 ft) west of the
centerline of the wooden walkway leading to the pier, and 0.38 m (1.25 ft) north
of the south face of a concrete bulkhead.



                         BENCH MARK STAMPING:  CIVL
                         DESIGNATION:          876 7816 CIVL

MONUMENTATION:           Survey disk                           VM#:        17165
AGENCY:                                                        IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   30° 13.6' N (  30.22617)          LONGITUDE:  93° 13.4' W ( -93.22347)


The bench mark is a disk set flush with the ground surface, 19.45 m (63.81 ft)
west of the center of Bord Du Lac Drive, 4.65 m (15.26 ft) west of the NW corner
of a sidewalk around a parking area, 3.15 m (10.33 ft) NNE of an unmarked light
pole and a fiberglass witness post, 3.22 m (10.56 ft) east of the east edge of
the sea wall sidewalk.  The bench mark is a 2-inch diameter aluminum disk,
crimped to a metal rod driven 10 m (32 ft) and encased in PVC.  The sidewalk
nearby is painted with "GPS" and an arrow pointing towards it.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8767816                         PUBLICATION DATE:  09/13/2017
Name:       LAKE CHARLES, CALCASIEU RIVER                     
            LA
NOAA Chart: 11347                           Latitude:   30° 13.4' N (  30.22364)
USGS Quad:  CALCASIEU                       Longitude:  93° 13.3' W ( -93.22167)


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


                         BENCH MARK STAMPING:  G 1 1918 19.754
                         DESIGNATION:          G 1

MONUMENTATION:           Bench Mark disk                       VM#:        18214
AGENCY:                  U. S. Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BK1400
SETTING CLASSIFICATION:  Building                              OPUS PID:        
LATITUDE:   30° 13.8' N (  30.22922)          LONGITUDE:  93° 12.9' W ( -93.21422)


The bench mark is a disk set vertically in the NW corner of an abandoned three
story building (501 Broad Street) at the NE quadrant of the intersection of
Hodges and Broad Streets, 19.82 m (65.03 ft) north of the north curb of Broad
Street, 2.37 m (7.78 ft) east of the east curb of Hodges Street, 0.96 m (3.15
ft) south of the NW corner of the building, and 1.2 m (3.9 ft) above the level
of the street.



                         BENCH MARK STAMPING:  7816 A 2008
                         DESIGNATION:          876 7816 A

MONUMENTATION:           Flange-encased Rod                    VM#:        19001
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   30° 13.4' N (  30.22317)          LONGITUDE:  93° 13.3' W ( -93.22181)


The bench mark is a flange-encased rod located 51.8 m (169.9 ft) SW of the SE
corner of the Pithon Cooulee gravity drainage pump house, 15.50 m (50.8 ft) NNW
of the NE corner of the concrete retaining wall located on the SE side of
Lakeshore Drive, 14.0 m (45.9 ft) SW of posted 35 mph speed limit sign, 8.4 m
(27.6 ft) from the centerline of Lakeshore Drive.  The datum point being the top
of a stainless steel rod driven 14.6 m (47.9 ft) to refusal.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8767816                         PUBLICATION DATE:  09/13/2017
Name:       LAKE CHARLES, CALCASIEU RIVER                     
            LA
NOAA Chart: 11347                           Latitude:   30° 13.4' N (  30.22364)
USGS Quad:  CALCASIEU                       Longitude:  93° 13.3' W ( -93.22167)


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


                         BENCH MARK STAMPING:   
                         DESIGNATION:          H 1

MONUMENTATION:           See descriptive text                  VM#:        19514
AGENCY:                                                        IDB PID#:        
SETTING CLASSIFICATION:                                        OPUS PID:        
LATITUDE:   30° 13.6' N (  30.22610)          LONGITUDE:  93° 13.1' W ( -93.21810)




                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8767816                         PUBLICATION DATE:  09/13/2017
Name:       LAKE CHARLES, CALCASIEU RIVER                     
            LA
NOAA Chart: 11347                           Latitude:   30° 13.4' N (  30.22364)
USGS Quad:  CALCASIEU                       Longitude:  93° 13.3' W ( -93.22167)


                            T I D A L   D A T U M S 


Tidal datums at LAKE CHARLES, CALCASIEU RIVER based on:

     LENGTH OF SERIES:      8 Years
     TIME PERIOD:           3/07-2/08, 2/09-1/10, 9/10-8/16
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8770570 SABINE PASS NORTH


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

     HIGHEST OBSERVED WATER LEVEL (08/30/2017)         =  1.497
     MEAN HIGHER HIGH WATER                     MHHW   =  0.429
     MEAN HIGH WATER                            MHW    =  0.397
     MEAN SEA LEVEL                             MSL    =  0.240
     MEAN TIDE LEVEL                            MTL    =  0.237
     MEAN LOW WATER                             MLW    =  0.077
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/02/2008)         = -0.895

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     A 269 1972                                  1.955    1.558
     4 1955                                      2.618    2.221
     NO 5 1973                                   2.730    2.333
     BM NO 7 1988                                1.900    1.503
     CIVL                                        2.000    1.603
     G 1 1918 19.754                             5.569    5.172
     7816 A 2008                                 2.909    2.512
     H 1                                         5.565    5.168


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

                                                                                
Station ID: 8767816                         PUBLICATION DATE:  09/13/2017
Name:       LAKE CHARLES, CALCASIEU RIVER                     
            LA
NOAA Chart: 11347                           Latitude:   30° 13.4' N (  30.22364)
USGS Quad:  CALCASIEU                       Longitude:  93° 13.3' W ( -93.22167)


                             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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