U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8516614 PUBLICATION DATE: 09/05/2003 Name: GLEN COVE YACHT CLUB, LONG ISLAND NY NOAA Chart: 12366 Latitude: 40° 51.8' N ( 40.86330) USGS Quad: SEA CLIFF Longitude: 73° 39.3' W ( -73.65500) To reach the tidal bench marks from the Glen Cove firehouse at the intersection of Glen Cove Road and Glen Cove Avenue, proceed south on Glen Cove Avenue, take the first right onto Charles Street, then left on The Place (bends to right and becomes Elwood Street), then left on McLoughlin to the end of the street at Glen Cove Yacht Club. The bench marks are in the retaining wall of the dock. The tide gauge and staff were at the west end of the dock. 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: 8516614 PUBLICATION DATE: 09/05/2003 Name: GLEN COVE YACHT CLUB, LONG ISLAND NY NOAA Chart: 12366 Latitude: 40° 51.8' N ( 40.86330) USGS Quad: SEA CLIFF Longitude: 73° 39.3' W ( -73.65500) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: BM NO 3 1934 DESIGNATION: TIDAL 3 STA II 10 MONUMENTATION: Tidal Station disk VM#: 7088 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: KU1595 SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 40° 51.8' N ( 40.86330) LONGITUDE: 73° 39.2' W ( -73.65330) The primary bench mark is a disk set in the top of the north concrete retaining wall at the junction of a low wire fence and a high wire fence, and 46 m (151 ft) east of bench mark NO 2 1934.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8516614 PUBLICATION DATE: 09/05/2003 Name: GLEN COVE YACHT CLUB, LONG ISLAND NY NOAA Chart: 12366 Latitude: 40° 51.8' N ( 40.86330) USGS Quad: SEA CLIFF Longitude: 73° 39.3' W ( -73.65500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BM NO 1 1934 DESIGNATION: TIDAL 1 STA II 10 MONUMENTATION: Tidal Station disk VM#: 7086 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: KU1594 SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 40° 51.8' N ( 40.86330) LONGITUDE: 73° 39.2' W ( -73.65330) The bench mark is a disk set in the top of the west end of the south concrete retaining wall at the SW corner of the dock, and 4 m (13 ft) south of a concrete ramp leading to a boat landing.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8516614 PUBLICATION DATE: 09/05/2003 Name: GLEN COVE YACHT CLUB, LONG ISLAND NY NOAA Chart: 12366 Latitude: 40° 51.8' N ( 40.86330) USGS Quad: SEA CLIFF Longitude: 73° 39.3' W ( -73.65500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BM NO 2 1934 DESIGNATION: TIDAL 2 STA II 10 MONUMENTATION: Tidal Station disk VM#: 7087 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: KU1593 SETTING CLASSIFICATION: Retaining wall OPUS PID#: KU1593 LATITUDE: 40° 51.8' N ( 40.86330) LONGITUDE: 73° 39.2' W ( -73.65330) The bench mark is a disk set in the top of the north concrete retaining wall, 31 m (102 ft) north of bench mark NO 1 1934, and 12 m (39 ft) east of the west end of the retaining wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8516614 PUBLICATION DATE: 09/05/2003 Name: GLEN COVE YACHT CLUB, LONG ISLAND NY NOAA Chart: 12366 Latitude: 40° 51.8' N ( 40.86330) USGS Quad: SEA CLIFF Longitude: 73° 39.3' W ( -73.65500) T I D A L D A T U M S Tidal datums at GLEN COVE YACHT CLUB, LONG ISLAND based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: June 1990 - August 1990 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8518490 NEW ROCHELLE Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 2.398 MEAN HIGH WATER MHW = 2.287 North American Vertical Datum NAVD88 = 1.265 MEAN SEA LEVEL MSL = 1.181 MEAN TIDE LEVEL MTL = 1.179 MEAN LOW WATER MLW = 0.071 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW BM NO 3 1934 4.653 2.366 BM NO 1 1934 4.533 2.246 BM NO 2 1934 4.498 2.211
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8516614 PUBLICATION DATE: 09/05/2003 Name: GLEN COVE YACHT CLUB, LONG ISLAND NY NOAA Chart: 12366 Latitude: 40° 51.8' N ( 40.86330) USGS Quad: SEA CLIFF Longitude: 73° 39.3' W ( -73.65500) 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.