U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8516990 PUBLICATION DATE: 04/21/2003 Name: WILLETS POINT, LITTLE BAY, EAST RIVER NY NOAA Chart: 12366 Latitude: 40° 47.6' N ( 40.79330) USGS Quad: FLUSHING Longitude: 73° 46.9' W ( -73.78170) To reach the tidal bench marks from the intersection of Interstate 495 (Long Island Expressway) and the Cross Island Parkway, proceed north on the Cross Island Expressway for 3.4 km (2.1 mi) to the Bell Avenue exit. Take the exit to the first intersection, turn right on Totten Avenue and continue for 0.40 km (0.25 mi) to the sentry post, pass the sentry post and bear left to the U.S. Coast Guard Station. The bench marks are located north of the U.S. Coast Guard Pier along Little Bay Road, Willets Street, and on the concrete sea wall. The tide station was located at the midpoint of the wave screen attached to the NW corner of the U.S. Coast Guard Pier at the foot of Willets Street. 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 8 Station ID: 8516990 PUBLICATION DATE: 04/21/2003 Name: WILLETS POINT, LITTLE BAY, EAST RIVER NY NOAA Chart: 12366 Latitude: 40° 47.6' N ( 40.79330) USGS Quad: FLUSHING Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 3 1944 DESIGNATION: TIDAL 3 STA II 6 MONUMENTATION: Tidal Station disk VM#: 300 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: KU0977 SETTING CLASSIFICATION: Retaining wall OPUS PID: LATITUDE: 40° 47.7' N ( 40.79500) LONGITUDE: 73° 46.9' W ( -73.78170) The primary bench mark is a disk set in the top of the north retaining wall of the land end of the Quartermaster Dock, 5.5 m (18 ft) west of the seawall, 1.5 m (5 ft) east of the west end of the concrete part of the dock, and 0.15 m (0.5 ft) south of the north edge of the concrete part of the dock. BENCH MARK STAMPING: NO 5 1975 DESIGNATION: 851 6990 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 304 AGENCY: National Ocean Survey (NOS) IDB PID#: AH6731 SETTING CLASSIFICATION: Concrete floor OPUS PID: LATITUDE: 40° 47.6' N ( 40.79330) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set in the concrete flooring at the entrance of the loading door on the west side of Building number 610, 16.2 m (53 ft) north of the small brick power building number 609, 11.43 m (37.5 ft) south of the main entrance to building number 610, and 7.6 m (25 ft) east of the centerline of the concrete roadway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8516990 PUBLICATION DATE: 04/21/2003 Name: WILLETS POINT, LITTLE BAY, EAST RIVER NY NOAA Chart: 12366 Latitude: 40° 47.6' N ( 40.79330) USGS Quad: FLUSHING Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6990 A 1982 DESIGNATION: 851 6990 A TIDAL MONUMENTATION: Tidal Station disk VM#: 306 AGENCY: National Ocean Survey (NOS) IDB PID#: AH6732 SETTING CLASSIFICATION: Concrete median OPUS PID: LATITUDE: 40° 47.6' N ( 40.79330) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set in the SE corner of a 3 m x 4 m (10 ft x 12 ft) concrete slab in the median of a Y formed by Bayside Street and Totten Avenue, 28.16 m (92.4 ft) south of the SE corner of Building number 601, 20.82 m (68.3 ft) east of the SW corner of building number 601, 10.67 m (35.0 ft) SE of the centerline of Bayside Street, and 5.06 m (16.6 ft) NW of the centerline of Totten Avenue.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8516990 PUBLICATION DATE: 04/21/2003 Name: WILLETS POINT, LITTLE BAY, EAST RIVER NY NOAA Chart: 12366 Latitude: 40° 47.6' N ( 40.79330) USGS Quad: FLUSHING Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: TIDAL 4 USE STA II 6 MONUMENTATION: Tidal Station disk VM#: 308 AGENCY: US Army Corps of Engineers (USE) IDB PID#: KU0978 SETTING CLASSIFICATION: Concrete road OPUS PID: LATITUDE: 40° 47.6' N ( 40.79330) LONGITUDE: 73° 46.8' W ( -73.78000) The bench mark is a disk set in the concrete roadway at the SE end of a chain link fence in the vicinity of Building number 615 of the U.S. Coast Guard Station, 7.9 m (26 ft) east of the NE corner of Building number 614, 0.15 m (0.5 ft) south of an angle in the retaining wall, 0.15 m (0.5 ft) south of an expansion joint in the driveway, and 0.15 m (0.5 ft) west of the retaining wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8516990 PUBLICATION DATE: 04/21/2003 Name: WILLETS POINT, LITTLE BAY, EAST RIVER NY NOAA Chart: 12366 Latitude: 40° 47.6' N ( 40.79330) USGS Quad: FLUSHING Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: TIDAL 735 STA II 6 MONUMENTATION: Chiseled Cross VM#: 309 AGENCY: IDB PID#: KU0979 SETTING CLASSIFICATION: Window sill OPUS PID: LATITUDE: 40° 47.6' N ( 40.79330) LONGITUDE: 73° 46.8' W ( -73.78000) The bench mark is a chiseled cross located on the west window sill of the north side of Building number 615 at the U.S. Coast Guard Station, 0.70 m (2.3 ft) west of the west face of a chimney, 0.43 m (1.4 ft) south of a steel fire escape ladder, 0.09 m (0.3 ft) west of the east end of the sill, and 1.07 m (3.5 ft) above the concrete floor.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8516990 PUBLICATION DATE: 04/21/2003 Name: WILLETS POINT, LITTLE BAY, EAST RIVER NY NOAA Chart: 12366 Latitude: 40° 47.6' N ( 40.79330) USGS Quad: FLUSHING Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: TIDAL 736 STA II 6 MONUMENTATION: Bolt VM#: 310 AGENCY: IDB PID#: KU0976 SETTING CLASSIFICATION: Granite water table OPUS PID: LATITUDE: 40° 47.6' N ( 40.79330) LONGITUDE: 73° 46.8' W ( -73.78000) The bench mark is a copper bolt set in the slanting top of the granite water table at the NE corner of the east wing of the two story red brick building number 637, at the intersection of Chapel Road and Totten Avenue, 167.6 m (550 ft) east of the U.S. Coast Guard pier, 27.13 m (89.0 ft) north of the north side of Totten Avenue, 7.16 m (23.5 ft) west of the centerline of Chapel Road, 0.3 m (1 ft) west of the NE corner of the east wing, and 0.70 m (2.2 ft) above the concrete curb, with the numerals 52.827 cut in the cornerstone 0.15 m (0.5 ft) above the bench mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8516990 PUBLICATION DATE: 04/21/2003 Name: WILLETS POINT, LITTLE BAY, EAST RIVER NY NOAA Chart: 12366 Latitude: 40° 47.6' N ( 40.79330) USGS Quad: FLUSHING Longitude: 73° 46.9' W ( -73.78170) T I D A L D A T U M S Tidal datums at WILLETS POINT, LITTLE BAY, EAST RIVER based on: LENGTH OF SERIES: 18 Years TIME PERIOD: January 1983 - December 2000 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (09/21/1938) = 5.105 MEAN HIGHER HIGH WATER MHHW = 2.373 MEAN HIGH WATER MHW = 2.262 North American Vertical Datum NAVD88 = 1.240 MEAN SEA LEVEL MSL = 1.182 MEAN TIDE LEVEL MTL = 1.174 MEAN LOW WATER MLW = 0.084 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/10/1978) = -1.311 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 3 1944 3.545 1.283 NO 5 1975 5.355 3.093 6990 A 1982 10.305 8.043 TIDAL 4 USE STA II 6 4.545 2.283 TIDAL 735 STA II 6 5.642 3.380 TIDAL 736 STA II 6 15.833 13.571
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8516990 PUBLICATION DATE: 04/21/2003 Name: WILLETS POINT, LITTLE BAY, EAST RIVER NY NOAA Chart: 12366 Latitude: 40° 47.6' N ( 40.79330) USGS Quad: FLUSHING Longitude: 73° 46.9' W ( -73.78170) 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.