Bench Mark Sheet for 8765251, Cypremort Point 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8765251                         PUBLICATION DATE:  12/01/2011
Name:       CYPREMORT POINT                                   
            LA
NOAA Chart: 11354                           Latitude:   29° 42.8' N (  29.71336)
USGS Quad:  POINT AU FER                    Longitude:  91° 52.8' W ( -91.88000)


To reach Cypremort Point from the intersection of US-90 and LA-83 in New Iberia
Parish, go SW for 23.8 km (14.8 mi) on LA-83, bearing left at the fork in the
road. Turn right and continue SW on LA-319 for 12.8 km (8.0 mi). Turn left on
Bayview lane and follow to Beacon lane, continue straight onto Beacon Lane
following west 0.2 km (0.1 mi) to the end of the road. The station was set on
the covered pier at the end of Beacon lane. The bench marks are located on
Beacon lane and Bayview lane.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8765251                         PUBLICATION DATE:  12/01/2011
Name:       CYPREMORT POINT                                   
            LA
NOAA Chart: 11354                           Latitude:   29° 42.8' N (  29.71336)
USGS Quad:  POINT AU FER                    Longitude:  91° 52.8' W ( -91.88000)


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


                 PRIMARY BENCH MARK STAMPING:  CYPR RESET TV14 SM 06 2001
                         DESIGNATION:          TV14 SM 06

MONUMENTATION:           Survey disk                           VM#:        17925
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  DJ9345
SETTING CLASSIFICATION:  Unspecified pipe/rod                  OPUS PID:        
LATITUDE:   29° 42.8' N (  29.71378)          LONGITUDE:  91° 52.7' W ( -91.87858)


The primary bench mark is a disk located in the yard of 218 Beacon Lane, 10.95 m
(35.93 ft) SE of the SE corner of the boathouse of 218 Beacon Lane, 4.45 m
(14.60 ft) NW of Beacon Lane and 1.35 m (4.43 ft) SW of a power pole.  The bench
mark is set flush in the grass, crimped to a rod driven an unspecifed depth into
the ground, encased in a 5-inch PVC pipe and capped with a NGS cover.



                         BENCH MARK STAMPING:  5251 A 2005
                         DESIGNATION:          876 5251 A

MONUMENTATION:           Flange-encased Rod                    VM#:        17926
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID#: BBBJ01
LATITUDE:   29° 42.8' N (  29.71333)          LONGITUDE:  91° 52.8' W ( -91.87967)


The bench mark is a flange-encased rod located at the end of Beacon Lane, 9.50 m
(31.17 ft) SW of the southern corner of a boathouse, 7.15 m (23.46 ft) NW of a
sewer man-hole cover, and 0.91 m (2.99 ft) east of a seawall.  The datum point
is set flush in the ground, being the top of a stainless steel rod driven 15.7 m
(51.5 ft) to refusal, in a sleeve extending to a depth of 0.46 m (1.51ft),
encased in a 5-inch PVC pipe, with a 5-inch NOS logo cap and surrounded by a
cement kickblock.

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

                                                                                
Station ID: 8765251                         PUBLICATION DATE:  12/01/2011
Name:       CYPREMORT POINT                                   
            LA
NOAA Chart: 11354                           Latitude:   29° 42.8' N (  29.71336)
USGS Quad:  POINT AU FER                    Longitude:  91° 52.8' W ( -91.88000)


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


                         BENCH MARK STAMPING:  5251 B 2005
                         DESIGNATION:          876 5251 B

MONUMENTATION:           Flange-encased Rod                    VM#:        17927
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   29° 42.9' N (  29.71419)          LONGITUDE:  91° 52.7' W ( -91.87786)


The bench mark is a flange-encased rod located off of Beacon Lane, 25.95 m
(85.14 ft) NW of a stop sign at the corner of Beacon Lane and LA-319, 7.20 m
(23.62 ft) NW of Beacon Lane, and 0.75 m (2.46 ft) SE of a power pole.  The
datum point is set flush with the grass, being the top of a stainless steel rod
driven 19.40 m (63.65 ft) to refusal, in a sleeve extending to a depth of 0.46 m
(1.51ft), encased in a 5-inch PVC pipe with a 5-inch NOS logo cap and surrounded
by a cement kickblock.



                         BENCH MARK STAMPING:  5251 C 2005
                         DESIGNATION:          876 5251 C

MONUMENTATION:           Tidal Station disk                    VM#:        17929
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Seawall                               OPUS PID:        
LATITUDE:   29° 42.9' N (  29.71428)          LONGITUDE:  91° 52.6' W ( -91.87689)


The bench mark is a disk set flush in a seawall at the entrance to Bayview
Point, 20.09 m (65.91 ft) SW of power pole "50 K 82749 38134," 7.10 m (23.29 ft)
from Bayview Drive, 2.50 m (8.2 ft) NW of Point Lane street sign, and 1.2 m (3.9
ft) above ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8765251                         PUBLICATION DATE:  12/01/2011
Name:       CYPREMORT POINT                                   
            LA
NOAA Chart: 11354                           Latitude:   29° 42.8' N (  29.71336)
USGS Quad:  POINT AU FER                    Longitude:  91° 52.8' W ( -91.88000)


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


                         BENCH MARK STAMPING:  5251 D 2005
                         DESIGNATION:          876 5251 D

MONUMENTATION:           Tidal Station disk                    VM#:        17930
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Seawall                               OPUS PID:        
LATITUDE:   29° 42.8' N (  29.71339)          LONGITUDE:  91° 52.6' W ( -91.87678)


The bench mark is a disk set flush in the seawall adjacent to Bayview Point
condominium, 30.51 m (100.10 ft) SW of SW corner of condo unit #111, 5.61 m
(18.41 ft) west of Point Lane, and 3.69 m (12.11ft) SW of power box "82746
38102."

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

                                                                                
Station ID: 8765251                         PUBLICATION DATE:  12/01/2011
Name:       CYPREMORT POINT                                   
            LA
NOAA Chart: 11354                           Latitude:   29° 42.8' N (  29.71336)
USGS Quad:  POINT AU FER                    Longitude:  91° 52.8' W ( -91.88000)


                            T I D A L   D A T U M S 


Tidal datums at CYPREMORT POINT based on:

     LENGTH OF SERIES:      49 MONTHS
     TIME PERIOD:           August 2006 - August 2010
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8764227 LAWMA, AMERADA PASS


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

     HIGHEST OBSERVED WATER LEVEL (04/30/2006)         =  1.288
     MEAN HIGHER HIGH WATER                     MHHW   =  0.518
     MEAN HIGH WATER                            MHW    =  0.476
     MEAN TIDE LEVEL                            MTL    =  0.274
     MEAN SEA LEVEL                             MSL    =  0.274
     MEAN LOW WATER                             MLW    =  0.072
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (12/16/2007)         = -0.886

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     CYPR RESET TV14 SM 06 2001                  1.149    0.673
     5251 A 2005                                 1.301    0.825
     5251 B 2005                                 1.374    0.898
     5251 C 2005                                 1.798    1.322
     5251 D 2005                                 1.741    1.265


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

                                                                                
Station ID: 8765251                         PUBLICATION DATE:  12/01/2011
Name:       CYPREMORT POINT                                   
            LA
NOAA Chart: 11354                           Latitude:   29° 42.8' N (  29.71336)
USGS Quad:  POINT AU FER                    Longitude:  91° 52.8' W ( -91.88000)


                             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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