U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8516945 PUBLICATION DATE: 12/29/2020 Name: KINGS POINT, LONG ISLAND SOUND NY NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031) USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500) To reach the bench marks from I495 north in Long Island, take exit 33 - Great Neck, proceed to the second traffic signal at Lakeville Road, then turn right onto Lakeville Road and proceed 7.9 km (4.9 mi) to Steamboat Road, then turn left onto Steamboat Road and continue 2.1 km (1.3 mi) to the entrance to the U.S. Merchant Marine Academy. Proceed past the guard shack and follow the entrance road to its end, then turn left onto the academy grounds and continue on the road to the sailing center. The bench marks are on Academy property along the water and the tide station is located on the sailing center dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 6945 A 1998 DESIGNATION: 851 6945 A MONUMENTATION: Flange-encased Rod VM#: 15689 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 40° 48.7' N ( 40.81106) LONGITUDE: 73° 45.8' W ( -73.76394) The primary bench mark is located at the SW corner of the Academy property near the west side of the chapel, 17.65 m (57.9 ft) SW of the SW corner of the chapel, 4.65 m (15.3 ft) east of the center of the road to the Prosser boat house, and 3.50 m (11.5 ft) NE of a fire hydrant. The datum point is the top of a stainless steel rod driven 6.71 m (22.0 ft) to refusal, and encased in a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8516945 PUBLICATION DATE: 12/29/2020 Name: KINGS POINT, LONG ISLAND SOUND NY NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031) USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6945 C 1998 DESIGNATION: 851 6945 C MONUMENTATION: Flange-encased Rod VM#: 15645 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 40° 48.8' N ( 40.81339) LONGITUDE: 73° 45.8' W ( -73.76358) The bench mark is a flange-encased rod located in a grassy area next to the steps on the south side of Samuels Hall, 21.80 m (71.5 ft) NNE of the NW corner of the Wooster Building, 7.70 m (25.3 ft) SE of the NW corner of Samuels Hall, and 2.15 m (7.1 ft) NW of a 1.2 m (4 ft) high concrete retaining wall. The datum point is the top of a stainless steel rod driven 6.1 m (20 ft) to refusal, and encased in a 5-inch NOS logo. BENCH MARK STAMPING: NO 2 1973 DESIGNATION: 851 6945 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 15690 AGENCY: National Ocean Survey (NOS) IDB PID: SETTING CLASSIFICATION: Concrete manhole foundation OPUS PID#: BBDM91 LATITUDE: 40° 48.8' N ( 40.81397) LONGITUDE: 73° 45.8' W ( -73.76394) The bench mark is a disk located in the SW corner of a concrete manhole foundation at the bend of the main entrance road around Samuels hall, 17.37 m (57.0 ft) north of the bottom center step of the east entrance to Samuels Hall, 7.70 m (25.3 ft) SW of the centerline of the road, and 0.72 m (2.4 ft) west of the center of the manhole cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8516945 PUBLICATION DATE: 12/29/2020 Name: KINGS POINT, LONG ISLAND SOUND NY NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031) USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6945 B 1998 DESIGNATION: 851 6945 B MONUMENTATION: Tidal Station disk VM#: 15691 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 40° 48.7' N ( 40.81178) LONGITUDE: 73° 45.8' W ( -73.76406) The bench mark is a disk located near the east end of a concrete seawall NW of the Eldridge Pool, 30.78 m (101.0 ft) south of the SE corner of a metal fence surrounding the pool, 29.60 m (97.1 ft) east of the SW corner of the 90 degree bend in the seawall, and 3.33 m (10.9 ft) west of the east end of the seawall. BENCH MARK STAMPING: 6945 D 2000 DESIGNATION: 851 6945 D MONUMENTATION: Tidal Station disk VM#: 16352 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Sheetpile and concrete bulkhead OPUS PID: LATITUDE: 40° 48.8' N ( 40.81336) LONGITUDE: 73° 45.9' W ( -73.76481) The bench mark is a disk located in the SE end of a sheetpile and concrete capped bulkhead, 49.54 m (162.5 ft) ESE of the NNW corner of the paved pier, 19.31 m (63.4 ft) SW of the SW corner of the Yocum Sailing Center, 0.51 m (1.7 ft) NW of the NW face of the bulkhead cap, 1.00 m (3.3 ft) north of the south face of the concrete bulkhead cap, and 1.00 m (3.3 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8516945 PUBLICATION DATE: 12/29/2020 Name: KINGS POINT, LONG ISLAND SOUND NY NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031) USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6945 E 2003 DESIGNATION: 851 6945 E MONUMENTATION: Tidal Station disk VM#: 17394 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 40° 48.7' N ( 40.81194) LONGITUDE: 73° 45.9' W ( -73.76439) The bench mark is a disk set in the top of a concrete sea wall located west of the Eldridge pool, 40.70 m (133.5 ft) west of the centerline of the road leading to the tide house, 27.69 m (90.8 ft) WSW of the SW corner of the fence around the pool, 16.38 m (53.7 ft) south of the southernmost of three cleats set in concrete monuments, 13.84 m (45.4 ft) north of the 90 degree turn in the sea wall, 0.90 m (3.0 ft) east of the west face of the bulkhead, and 0.80 m (2.6 ft) above ground. BENCH MARK STAMPING: 6945 G 2014 DESIGNATION: 851 6945 G MONUMENTATION: Tidal Station disk VM#: 21204 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Bulkhead OPUS PID#: BBDN94 LATITUDE: 40° 48.8' N ( 40.81250) LONGITUDE: 73° 45.9' W ( -73.76556) The bench mark is a disk set flush in concrete pier located in the W side of boat repair shop on new concrete pier, 17.9 m (58.7 ft) S of the fifth light pole S of the N end of the concrete pier, 9.5 m (31.2 ft) N of the sixth light pole S of the N end of the concrete pier, 5.4 m (17.7 ft) W of the fourth Ballard located S of the N end of concrete pier.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8516945 PUBLICATION DATE: 12/29/2020 Name: KINGS POINT, LONG ISLAND SOUND NY NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031) USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6945 F 2014 DESIGNATION: 851 6945 F MONUMENTATION: Tidal Station disk VM#: 21205 AGENCY: National Ocean Service (NOS) IDB PID: SETTING CLASSIFICATION: Bulkhead OPUS PID: LATITUDE: 40° 48.7' N ( 40.81139) LONGITUDE: 73° 45.9' W ( -73.76583) The bench mark is disk set flush in concrete pier located in the S end of a new concrete pier on the W side of the boat repair shop, 12.23 m (40.1 ft) S of the S-most light pole on concrete pier, 3.45 m (11.3 ft) W of the most S Ballard on the E face of the concrete pier, 2.25 m (7.4 ft) E of the most S Ballard on the W face of the concrete pier. BENCH MARK STAMPING: 6945 H 2016 DESIGNATION: 851 6945 H MONUMENTATION: Tidal Station disk VM#: 21817 AGENCY: NOS IDB PID: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 40° 48.8' N ( 40.81386) LONGITUDE: 73° 45.9' W ( -73.76453) The bench mark is located in the great neck area of Long Island at the U.S. Merchant Marine Academy at Kings Point, set flush in the north facing corner of the concrete pad, 60.9 m (199.8 ft) east of the east end of the seawall, 20.9 m (68.6 ft) west of a US Penny set in the NW corner of the concrete step that leads from the parking lot down to the sea wall, and 2.12 m (7.0 ft) south of the concrete sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8516945 PUBLICATION DATE: 12/29/2020 Name: KINGS POINT, LONG ISLAND SOUND NY NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031) USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500) T I D A L D A T U M S Tidal datums at KINGS POINT, LONG ISLAND SOUND based on: LENGTH OF SERIES: 17 YEARS TIME PERIOD: 9/99-8/11, 2/12-1/15, 9/16-5/19 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8467150 BRIDGEPORT, BRIDGEPORT HARBOR Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (10/30/2012) = 4.341 MEAN HIGHER HIGH WATER MHHW = 2.377 MEAN HIGH WATER MHW = 2.268 North American Vertical Datum NAVD88 = 1.282 MEAN SEA LEVEL MSL = 1.186 MEAN TIDE LEVEL MTL = 1.176 MEAN LOW WATER MLW = 0.085 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/06/2018) = -1.223 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 6945 A 1998 5.735 3.467 6945 C 1998 5.897 3.629 NO 2 1973 4.272 2.004 6945 B 1998 4.649 2.381 6945 D 2000 4.826 2.558 6945 E 2003 4.574 2.306 6945 G 2014 4.589 2.321 6945 F 2014 4.616 2.348 6945 H 2016 3.887 1.619 Foot Notes:
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8516945 PUBLICATION DATE: 12/29/2020 Name: KINGS POINT, LONG ISLAND SOUND NY NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031) USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500) 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.