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.