NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

Bench Mark Sheet for 8555889, Brandywine Shoal Light DE

Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8555889                         PUBLICATION DATE:  04/08/2013
Name:       BRANDYWINE SHOAL LIGHT, DELAWARE BAY              
            DE
NOAA Chart: 12216                           Latitude:   38° 59.2' N (  38.98667)
USGS Quad:  CAPE HENLOPEN                   Longitude:  75°  6.8' W ( -75.11333)


  Station is located out in the Delaware Bay on Brandywine light house. Boat can
be launched from Cape May NJ or Lewes DE for quickest route.


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


                 PRIMARY BENCH MARK STAMPING:  8559 A 2007
                         DESIGNATION:          855 5889 A

MONUMENTATION:           Survey disk                           VM#:        18678
AGENCY:                  National Ocean Survey/Service(NOS)    IDB PID#:        
SETTING CLASSIFICATION:  Lighthouse wall                       OPUS PID:        
LATITUDE:   38° 59.2' N (  38.98670)          LONGITUDE:  75°  6.8' W ( -75.11330)


The primary bench mark is a tidal station disk set vertical on the south side of
Brandywine Shoal lighthhouse, set in the concrete of the lighthouse wall,
located on the south side of light house near the ladder of the Brandywine Shoal
lighthouse and on the north side of the ladder to the second floor of the
lighthouse, 1.04 m (3.14 ft) west from the west side of a support arch on the
east side of ladder to second floor, 0.826 m (2.710 ft) north of ladder to
second floor platform of light house, and 0.526 m (1.726 ft) east from the most
easterly of three conduits running into the lighthouse the south side, 2.074 m
(6.804 ft) above the walk away.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8555889                         PUBLICATION DATE:  04/08/2013
Name:       BRANDYWINE SHOAL LIGHT, DELAWARE BAY              
            DE
NOAA Chart: 12216                           Latitude:   38° 59.2' N (  38.98667)
USGS Quad:  CAPE HENLOPEN                   Longitude:  75°  6.8' W ( -75.11333)


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


                         BENCH MARK STAMPING:  Brandywine T1 97
                         DESIGNATION:          855 5889 Brandywine T1

MONUMENTATION:           Survey disk                           VM#:        16293
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:        
SETTING CLASSIFICATION:  Lighthouse Platform                   OPUS PID:        
LATITUDE:   38° 59.2' N (  38.98670)          LONGITUDE:  75°  6.8' W ( -75.11330)


The bench mark is located on the south side of the second platform of the
Brandywine Shoal Lighthouse, 1.74 m (5.7 ft) south of the south door entrance to
the platform, 0.82 m (2.7 ft) north of the south edge of the platform, and 0.76
m (2.5 ft) NW of a railing post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 8555889                         PUBLICATION DATE:  04/08/2013
Name:       BRANDYWINE SHOAL LIGHT, DELAWARE BAY              
            DE
NOAA Chart: 12216                           Latitude:   38° 59.2' N (  38.98667)
USGS Quad:  CAPE HENLOPEN                   Longitude:  75°  6.8' W ( -75.11333)


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


                         BENCH MARK STAMPING:  X
                         DESIGNATION:          Chisel Cross

MONUMENTATION:           Chiseled Cross                        VM#:        18182
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Lighthouse wall                       OPUS PID:        
LATITUDE:   38° 59.2' N (  38.98670)          LONGITUDE:  75°  6.8' W ( -75.11330)


The bench mark is a chisled cross in the concrete of the lighthouse wall,
located on the south side of the lighthouse near the ladder of the Brandywine
Shoal Lighthouse and on the north side of the ladder to the second floor of the
lighthouse, 1.04 m (3.4 ft) west from the west side of a support arch on the
east side of ladder to the second floor, 0.83 m (2.7 ft) north of the ladder to
the second floor platform of lighthouse, and 0.53 m (1.7 ft) east from the most
easterly of three conduits running into the lighthouse on the south side, and
2.07 m (6.80 ft) above the walk way.



                         BENCH MARK STAMPING:  3
                         DESIGNATION:          855 5889 RESET BOLT 3

MONUMENTATION:           Bolt                                  VM#:        18684
AGENCY:                  National Ocean Survey/Service(NOS)    IDB PID#:        
SETTING CLASSIFICATION:  Wood pier stringer                    OPUS PID:        
LATITUDE:   38° 59.1' N (  38.98500)          LONGITUDE:  75°  6.7' W ( -75.11170)


The bench mark is a galvanized 5/8 inch hex head throubolt located on Brandywine
Shoal Lighthouse in a 0.32 m (1.05ft) X 0.32 m (1.05 ft) timber supporting the
walkway on the north side of the NOAA tide station at the middle concrete drain
colvert support on the east side of walk, 10.251 m (33.632 ft) north of the
centerline of the Aquatrak well, 9.232 m (30.2887 ft) south of the south side of
light house by ladder leading to uper part of light house, 0.210 m (0.689 ft)
west of the east side of catwalk stringer to walkway, and 1.16 m (3.81 ft) above
the upper concrete covert support structure to walkway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 8555889                         PUBLICATION DATE:  04/08/2013
Name:       BRANDYWINE SHOAL LIGHT, DELAWARE BAY              
            DE
NOAA Chart: 12216                           Latitude:   38° 59.2' N (  38.98667)
USGS Quad:  CAPE HENLOPEN                   Longitude:  75°  6.8' W ( -75.11333)


                            T I D A L   D A T U M S 


Tidal datums at BRANDYWINE SHOAL LIGHT, DELAWARE BAY based on:

     LENGTH OF SERIES:      9 YEARS
     TIME PERIOD:           August 2002 - July 2011
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8536110 CAPE MAY, CAPE MAY CANAL, DELAWARE BAY


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

     HIGHEST OBSERVED WATER LEVEL (08/27/2011)         =  2.641
     MEAN HIGHER HIGH WATER                     MHHW   =  1.676
     MEAN HIGH WATER                            MHW    =  1.543
     MEAN TIDE LEVEL                            MTL    =  0.797
     MEAN SEA LEVEL                             MSL    =  0.797
     MEAN LOW WATER                             MLW    =  0.050
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (03/09/2005)         = -0.712

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     8559 A 2007                                 4.611    3.068
     Brandywine T1 97                            7.333    5.790
     X                                           4.766    3.223
     3                                           2.710    1.167


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

                                                                                
Station ID: 8555889                         PUBLICATION DATE:  04/08/2013
Name:       BRANDYWINE SHOAL LIGHT, DELAWARE BAY              
            DE
NOAA Chart: 12216                           Latitude:   38° 59.2' N (  38.98667)
USGS Quad:  CAPE HENLOPEN                   Longitude:  75°  6.8' W ( -75.11333)


                             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.

Return to Top
Products available at 8555889 Brandywine Shoal Light, DE

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