U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 07/20/1987 Station ID: 8512354 SUPERCEDED DATE: 04/21/2003 Name: SHINNECOCK INLET, ATLANTIC OCEAN NEW YORK NOAA Chart: 12353 Latitude: 40° 50.2' N USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' W To reach the tidal bench marks from the Hampton Bays Post Office, proceed SE on Ponquogue Bridge Road for 3.5 miles (5.6 m) to Dune Road, turn left on Dune Road and proceed east for 1.1 miles (1.8 km) to its end. The bench marks are located along Dune Road. The tide gage and staff were located on a piling 125 feet (38 m) west of the western jetty and 200 feet (61 m) south of the approximate low water line of the beach. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 2354 A 1977 MONUMENTATION: Survey Disk VM#: 7405 AGENCY: PID: SETTING CLASSIFICATION: Unspecified Steel Rod The bench mark is 164.5 feet (50.1 m) south of the centerline of Dune Road at the end, 154.6 feet (47.1 m) SW of a red beacon light, 140.6 feet (42.9 m) south of utility pole #46, and 33.9 feet (10.3 m) SE of the Bench Mark No 1 1974. The bench mark is crimped to a unspecified steel rod driven 50 feet (15 m), encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: NO 1 1974 MONUMENTATION: Survey Disk VM#: 7400 AGENCY: PID: SETTING CLASSIFICATION: Concrete Foundation The bench mark is set flush in a concrete slab beneath an observation tower close to the inlet, 210 feet (64 m) SE of the SW corner of Shinnecock Bait and Tackle Snack Bar, 130 feet (40 m) SE of the intersection of Dune Road and the parking lot entrance, and 5 feet (2 m) NE of the NW corner of the observation tower leg.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 07/20/1987 Station ID: 8512354 SUPERCEDED DATE: 04/21/2003 Name: SHINNECOCK INLET, ATLANTIC OCEAN NEW YORK NOAA Chart: 12353 Latitude: 40° 50.2' N USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1974 MONUMENTATION: Survey Disk VM#: 7401 AGENCY: PID: SETTING CLASSIFICATION: Concrete Foundation The bench mark is set in the concrete slab foundation of the stairway entrance to Shinnecock Bait and Tackle Snack Bar, 200 feet (61 m) NW of the Coast Guard light, 75 feet (23 m) north of the centerline of Dune Road, 30 feet (9 m) east of the centerline of the parking lot entrace next to the snack bar, and 3 feet (1 m) south of the door to the restaurant. BENCH MARK STAMPING: NO 3 1974 MONUMENTATION: Survey Disk VM#: 7402 AGENCY: PID: SETTING CLASSIFICATION: Concrete Foundation The bench mark is set flush in the SW corner of a concrete fuel tank cover located in the Deck Restaurant parking lot, 99.5 feet (30.3 m) SW of the NW corner of a wooden porch on the Deck Restaurant, 72.3 feet (22.0 m) north of the centerline of Dune Road, 53.9 feet (16.4 m) west of a P.K. nail set on top of a wooden post near the SW corner of the Deck Restaurant at the beginning of a line of wooden guard rail posts, and 42.4 feet (12.9 m) NW of a P.K. nail set on the top of a wooden post at the end of the line of wooden guard rail posts.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 07/20/1987 Station ID: 8512354 SUPERCEDED DATE: 04/21/2003 Name: SHINNECOCK INLET, ATLANTIC OCEAN NEW YORK NOAA Chart: 12353 Latitude: 40° 50.2' N USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2354 B 1977 MONUMENTATION: Survey Disk VM#: 7406 AGENCY: PID: SETTING CLASSIFICATION: Unspecified Steel Rod The bench mark is 132.2 feet (40.3 m) SE of the SW corner of the Shinnecock Bait and Tackle Snack Bar, 119.2 feet (36.3 m) SE of a P.K. nail set 5 feet (2 m) up a utility pole, 115.6 feet (35.2 m) south of the SE corner of the Shinnecock Bait and Tackle Snack Bar and the easterly building line extended, 64.4 feet (19.6 m) south of the centerline of Dune Road, and 45.2 feet (13.8 m) SW of a P.K. nail set 5 feet (2 m) up utility pole #45. The bench mark is crimped to an unspecified steel rod driven 50 feet (15 m), encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 2354 C 1977 MONUMENTATION: Survey Disk VM#: 7407 AGENCY: PID: SETTING CLASSIFICATION: Unspecified Steel Rod The bench mark is 135.6 feet (41.3 m) SE of a P.K. nail set 4 feet (1 m) up utility pole #41, 100.6 feet (30.7 m) SW of a P.K. nail set 4 feet (1 m) up utility pole #43, 50.7 feet (15.5 m) south of the centerline of Dune Road, and 28.4 feet (8.7 m) south of a P.K. nail set 3 feet (1 m) up utility pole #42. The bench mark is crimped to an unspecified steel rod driven 50 feet (15 m) to refusal, encased in 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 07/20/1987 Station ID: 8512354 SUPERCEDED DATE: 04/21/2003 Name: SHINNECOCK INLET, ATLANTIC OCEAN NEW YORK NOAA Chart: 12353 Latitude: 40° 50.2' N USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' W T I D A L D A T U M S Tidal datums at SHINNECOCK INLET, ATLANTIC OCEAN based on: LENGTH OF SERIES: 12 MONTHS TIME PERIOD: JUNE 1978-MAY 1979 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 (12/25/1978) = 7.17 MEAN HIGHER HIGH WATER (MHHW) = 3.78 MEAN HIGH WATER (MHW) = 3.49 MEAN TIDE LEVEL (MTL) = 1.83 MEAN LOW WATER (MLW) = 0.16 MEAN LOWER LOW WATER (MLLW) = 0.00 LOWEST OBSERVED WATER LEVEL (03/28/1979) = -1.67 National Geodetic Vertical Datum (NGVD 29) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 2354 A 1977 15.38 11.89 NO 1 1974 14.80 11.31 NO 2 1974 7.08 3.59 NO 3 1974 9.52 6.03 2354 B 1977 7.83 4.34 2354 C 1977 7.71 4.22
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 07/20/1987 Station ID: 8512354 SUPERCEDED DATE: 04/21/2003 Name: SHINNECOCK INLET, ATLANTIC OCEAN NEW YORK NOAA Chart: 12353 Latitude: 40° 50.2' N USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' 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 (NAVD 88). NGVD 29 is a fixed datum adopted as a national standard geodetic reference for heights but is now considered superseded. NGVD 29 is sometimes referred to as Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National Geodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey. NAVD 88 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. NAVD 88 replaces NGVD 29 as the national standard geodetic reference for heights. Bench mark elevations relative to NAVD 88 are available from NGS through the World Wide Web at National Geodetic Survey. NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred to MLLW only when two or more of the bench marks listed have NAVD 88 elevations. The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD 88 elevations listed for each bench mark in the NGS database.