U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 03/19/1986 Station ID: 8519024 SUPERCEDED DATE: 04/21/2003 Name: FORT WADSWORTH, STATEN ISLAND NEW YORK NOAA Chart: 12334 Latitude: 40° 36.4' N USGS Quad: THE NARROWS Longitude: 74° 3.3' W To reach the tidal bench marks located at Fort Wadsworth, Staten Island, proceed off the last exit of Interstate I-278 before crossing the Verrazano Narrows Bridge into Brooklyn, then along Wadsworth Street to the park and a service road and through the gate down to the pier. The bench marks are located in top of a granite block seawall in the vicinity of Ft. Wadsworth. The tide gage and staff were located on the NW side of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 3 1951 MONUMENTATION: Survey Disk VM#: 2406 AGENCY: PID#: KV0403 SETTING CLASSIFICATION: Granite Block Seawall The bench mark is set in top of a granite block seawall, SE of the pier at Ft. Wadsworth, 147 feet (45 m) SE of Bench Mark 9024 A 1980, 119 feet (36 m) NW of north corner of abandoned fortification called Fort Weed, 90 feet (27 m) east of the centerline of the pier, 32 feet (10 m) north of centerline of service road, and 7 feet (2 m) above shoreline. BENCH MARK STAMPING: NO 2 1951 MONUMENTATION: Survey Disk VM#: 2405 AGENCY: PID#: KV0406 SETTING CLASSIFICATION: Concrete Seawall The bench mark is set in top of the SE end of a concrete seawall west of the pier at Ft. Wadsworth, at the junction of the granite block seawall and concrete seawall, 142 feet (43 m) SW of Bench Mark 9024 A 1980, 25 feet (8 m) west of a small concrete block building, formerly housing switchboard, and 8 feet (2 m) above shoreline.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 03/19/1986 Station ID: 8519024 SUPERCEDED DATE: 04/21/2003 Name: FORT WADSWORTH, STATEN ISLAND NEW YORK NOAA Chart: 12334 Latitude: 40° 36.4' N USGS Quad: THE NARROWS Longitude: 74° 3.3' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 5 1951 MONUMENTATION: Survey Disk VM#: 2407 AGENCY: PID#: KV0398 SETTING CLASSIFICATION: Concrete Wall The bench mark is set in top of inner one of two concentric concrete walls forming tank about 2 feet (0.6 m) deep, 300 feet (91 m) SE of NW corner of Old Fort, 40 feet (12 m) east and across road from small concrete block building #79, 40 feet (12 m) SW of Building #E-53, 31 feet (9 m) SE of a fire hydrant, and 18 feet (5 m) east of centerline of road leading to pier. BENCH MARK STAMPING: 9024 A 1980 MONUMENTATION: Survey Disk VM#: 2408 AGENCY: PID: SETTING CLASSIFICATION: Concrete Pier The bench mark is set flush in a concrete section of a granite service pier located at Ft. Wadsworth, 106 feet (32 m) south of the northermost corner of the wooden section of the pier, 27 feet (8 m) west of a set of granite steps which lead into the water from the pier, and 10 feet (3 m) east of the western edge of the pier, and is east of the easternmost rail of a small set of railroad tracks on the granite section of the pier.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 03/19/1986 Station ID: 8519024 SUPERCEDED DATE: 04/21/2003 Name: FORT WADSWORTH, STATEN ISLAND NEW YORK NOAA Chart: 12334 Latitude: 40° 36.4' N USGS Quad: THE NARROWS Longitude: 74° 3.3' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9024 B 1980 MONUMENTATION: Survey Disk VM#: 2409 AGENCY: PID: SETTING CLASSIFICATION: Concrete Wall The bench mark is set flush in top of a small concrete wall which is 2.9 feet (0.9 m) high and the southernmost section of the wall immediately adjacent to a small walk/railway entrance to the Fort, 45 feet (14 m) east of the centerline of the road, 36 feet (11 m) north of the centerline of a set of railroad tracks leading into the Fort Entrance, and 27 feet (8 m) west from the Fort wall in the NW corner of the square formed by the Fort and the small U shaped wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 03/19/1986 Station ID: 8519024 SUPERCEDED DATE: 04/21/2003 Name: FORT WADSWORTH, STATEN ISLAND NEW YORK NOAA Chart: 12334 Latitude: 40° 36.4' N USGS Quad: THE NARROWS Longitude: 74° 3.3' W T I D A L D A T U M S Tidal datums at FORT WADSWORTH, STATEN ISLAND based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: AUGUST - OCTOBER 1980 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8518750 THE BATTERY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (10/25/1980) = 7.93 MEAN HIGHER HIGH WATER MHHW = 5.10 MEAN HIGH WATER MHW = 4.76 MEAN TIDE LEVEL MTL = 2.49 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 1.79 MEAN LOW WATER MLW = 0.21 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (10/26/1980) = -2.71 * NGVD reference based on elevations published in Quad *NGVD is, 1968, and NOS leveling of 1981. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW NO 3 1951 8.94 4.18 NO 2 1951 14.86 10.10 NO 5 1951 14.06 9.30 9024 A 1980 10.76 6.00 9024 B 1980 13.91 9.15
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 03/19/1986 Station ID: 8519024 SUPERCEDED DATE: 04/21/2003 Name: FORT WADSWORTH, STATEN ISLAND NEW YORK NOAA Chart: 12334 Latitude: 40° 36.4' N USGS Quad: THE NARROWS Longitude: 74° 3.3' 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.