U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 06/26/2002 Station ID: 8518639 SUPERCEDED DATE: 04/21/2003 Name: PORT MORRIS, EAST 138TH ST. NEW YORK NOAA Chart: 12339 Latitude: 40° 48.1' N USGS Quad: CENTRAL PARK Longitude: 73° 54.4' W To reach the tidal bench marks from FDR Drive in Manhattan, take the Willis Avenue Bridge exit and follow Willis Avenue north to 138th Street, turn right (east) onto 138th Street and continue to its end at East River. The bench marks are on the property of Castle Terminals, Inc. on the left (north) side of the road at the river. The tide gage was located on the NE side of the steel catwalk leading to three loading cells. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 5 1951 DESIGNATION: TIDAL 5 STA I 40 A MONUMENTATION: Tidal Station disk VM#: 2364 AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: KU1012 SETTING CLASSIFICATION: Concrete retaining wall The primary bench mark is a disk set flush on top of a low, short, north-south concrete retaining wall, 22 m (72 ft) west of bench mark NO 4 1951, 18 m (59 ft) NE of the NE curb of East 138th Street, 1.07 m (3.5 ft) NE of the north corner of the boiler room at Pittston Petroleum Co., 1 m (2 ft) SW of a concrete retaining wall, and 0.61 m (2.0 ft) above the concrete walk. BENCH MARK STAMPING: NO 4 1951 DESIGNATION: TIDAL 4 STA I 40 A MONUMENTATION: Tidal Station disk VM#: 2363 AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: KU1013 SETTING CLASSIFICATION: Concrete retaining wall The bench mark is a disk set flush on top of a low, short, north-south concrete retaining wall, 23.62 m (77.5 ft) NW of a bulkhead, 15.85 m (52.0 ft) NE of the NE curb of East 138th Street, 10 m (33 ft) NW of the center of a gate in a woven wire fence, 2 m (8 ft) SW of a concrete retaining wall, 2 m (7 ft) NE of the NE corner of the boiler room at Pittston Petroleum Company, and 0.61 m (2.0 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 06/26/2002 Station ID: 8518639 SUPERCEDED DATE: 04/21/2003 Name: PORT MORRIS, EAST 138TH ST. NEW YORK NOAA Chart: 12339 Latitude: 40° 48.1' N USGS Quad: CENTRAL PARK Longitude: 73° 54.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8639 B 1981 DESIGNATION: 851 8639 B MONUMENTATION: Tidal Station disk VM#: 2366 AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Concrete walk The bench mark is a disk set flush in a concrete walk between a high retaining wall and the office building at 939 East 138th Street, 18 m (59 ft) west of bench mark NO 5 1951, 16.31 m (53.5 ft) north of the north curb of 138th Street, 2.19 m (7.2 ft) south of the retaining wall, 1.16 m (3.8 ft) WNW of the NW corner of the office building, and 0.21 m (0.7 ft) above ground level. BENCH MARK STAMPING: 8639 C 1981 DESIGNATION: 851 8639 C MONUMENTATION: Tidal Station disk VM#: 2367 AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Concrete doorway inset The bench mark is a disk set flush in a concrete doorway inset in the boiler room building at Pittston Petroleum Company, 22 m (72 ft) east of the SW end of the boiler room building, 10.79 m (35.4 ft) NW of the east curb on the north side of East 138th Street, 7.77 m (25.5 ft) north of the north curb of East 138th Street, and 3.72 m (12.2 ft) west of the SE corner of the boiler room building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 06/26/2002 Station ID: 8518639 SUPERCEDED DATE: 04/21/2003 Name: PORT MORRIS, EAST 138TH ST. NEW YORK NOAA Chart: 12339 Latitude: 40° 48.1' N USGS Quad: CENTRAL PARK Longitude: 73° 54.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8639 D 2000 DESIGNATION: 851 8639 D MONUMENTATION: Tidal Station disk VM#: 16238 AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Concrete sheetpile The bench mark is a disk set in concrete sheetpile cell at the intersection of 138th Street at East River, 20.33 m (66.7 ft) SSE of the shore end of the catwalk leading to the cell, 8.51 m (27.9 ft) north of the ballard on the southern side of the cell, 3.55 m (11.7 ft) east of the south offshore corner of the catwalk leading to the cell, and 2.24 m (7.3 ft) south of the SE offshore end of the catwalk leading to the cell.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 06/26/2002 Station ID: 8518639 SUPERCEDED DATE: 04/21/2003 Name: PORT MORRIS, EAST 138TH ST. NEW YORK NOAA Chart: 12339 Latitude: 40° 48.1' N USGS Quad: CENTRAL PARK Longitude: 73° 54.4' W T I D A L D A T U M S Tidal datums at PORT MORRIS, EAST 138TH ST. based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: August 2000 - July 2001 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8516945 KINGS POINT, LONG ISLAND SOUND Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (03/07/2001) = 2.819 MEAN HIGHER HIGH WATER MHHW = 2.087 MEAN HIGH WATER MHW = 1.979 North American Vertical Datum NAVD88 = 1.107 MEAN TIDE LEVEL MTL = 1.031 MEAN SEA LEVEL MSL = 1.026 MEAN LOW WATER MLW = 0.082 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (12/13/2000) = -0.873 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 5 1951 4.783 2.804 NO 4 1951 4.680 2.701 8639 B 1981 4.360 2.381 8639 C 1981 4.151 2.172 8639 D 2000 3.640 1.661
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 06/26/2002 Station ID: 8518639 SUPERCEDED DATE: 04/21/2003 Name: PORT MORRIS, EAST 138TH ST. NEW YORK NOAA Chart: 12339 Latitude: 40° 48.1' N USGS Quad: CENTRAL PARK Longitude: 73° 54.4' W 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 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.