U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8511629 PUBLICATION DATE: 11/06/2014 Name: SAG HARBOR, SHELTER IS. SOUND NY NOAA Chart: 12358 Latitude: 41° 0.2' N ( 41.00330) USGS Quad: GREENPORT Longitude: 72° 17.8' W ( -72.29670) To reach the bench marks from the sag harbor post office on long island avenue, proceed east 0.1 km (0.05 mi) on long island avenue to main street, turn left and proceed north 0.02 km (0.01 mi) on main street to the intersection with bay street, turn right and proceed se 0.1 km (0.07 mi) on bay street to the intersection with marine park drive, turn left and proceed north 0.05 km (0.03 mi) on marine park drive to the bulkhead. The bench marks are along the waterfront, main street and hampton street. The tide gauge is located at the nw corner of the bulkhead in marine park. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1629 A 2014 DESIGNATION: 851 1629 A MONUMENTATION: Flange-encased Rod VM#: 21016 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 41° 0.2' N ( 41.00256) LONGITUDE: 72° 17.7' W ( -72.29439) The primary bench mark is a flange encased rod set in the grass strip along the waterfront, 20.88 m (68.5 ft) ESE of the E wall of the waterfront marina building, 15.13 m (49.6 ft) NNE of an unnumbered power pole with a no parking sign, 8.70 m (28.5 ft) S of a tree growing out of a stone seawall, 3.82 m (12.5 ft) SSW of the wood railing along the wood boardwalk on top of the bulkhead, and 2.16 m (7.1 ft) SW of the W most decorative light pole. The bench mark is set 7 cm (3 in) below grade being the top of a stainless steel rod driven 28.0 m (92.0 ft) to substantial resistance and enchased in a 5-inch pvc pipe with concrete kickblock and NOS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8511629 PUBLICATION DATE: 11/06/2014 Name: SAG HARBOR, SHELTER IS. SOUND NY NOAA Chart: 12358 Latitude: 41° 0.2' N ( 41.00330) USGS Quad: GREENPORT Longitude: 72° 17.8' W ( -72.29670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1629 B 2014 DESIGNATION: 851 1629 B MONUMENTATION: Flange-encased Rod VM#: 21017 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBDL98 LATITUDE: 41° 0.1' N ( 41.00200) LONGITUDE: 72° 17.5' W ( -72.29239) The bench mark is a flange encased rod set in the grass strip along the waterfront, 6.24 m (20.5 ft) S of an electric pedestal for boat shore power on the N side of the bulkhead, 5.08 m (16.7 ft) SSW of the NE side of the bulkhead, 3.97 m (13.0 ft) NE of the SW side of the bulkhead, 3.07 m (10.1 ft) SE of the E most decorative light post and 2.40 m (7.9 ft) WNW of the E end of the bulkhead and the entrance to the harbor. The bench mark is set 8 cm (3 in) below grade being the top of a stainless steel rod driven 28.0 m (92.0 ft) to substantial resistance and encased in a 5-inch pvc pipe with concrete kickblock and NOS logo cap. BENCH MARK STAMPING: 1629 C 2014 DESIGNATION: 851 1629 C MONUMENTATION: Bench Mark disk VM#: 21018 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete tank wall OPUS PID: LATITUDE: 41° 0.1' N ( 41.00194) LONGITUDE: 72° 17.5' W ( -72.29136) The bench mark is a disk set in the UV treatment concrete tank wall, 6.92 m (22.7 ft) ESE of the NE corner of the brick building, 6.37 m (20.9 ft) S of the fence along water on the N side of the property, 4.56 m (15.0 ft) W of the N corner on the E side of the tank, 1.30 m (4.3 ft) S of the NW corner of the tank, 0.25 m (0.8 ft) N of the metal railing on top of the tank and 0.61 m (2.0 ft) above grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8511629 PUBLICATION DATE: 11/06/2014 Name: SAG HARBOR, SHELTER IS. SOUND NY NOAA Chart: 12358 Latitude: 41° 0.2' N ( 41.00330) USGS Quad: GREENPORT Longitude: 72° 17.8' W ( -72.29670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TIDAL 1 RESET 1983 DESIGNATION: 851 1629 TIDAL 1 RESET MONUMENTATION: Bench Mark disk VM#: 21019 AGENCY: National Geodetic Survey IDB PID#: LX7648 SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 41° 0.1' N ( 41.00186) LONGITUDE: 72° 17.7' W ( -72.29542) The bench mark is a disk set in the concrete slab for the air conditioning unit, 22.53 m (73.9 ft) ESE of the SW corner of the provisions natural foods building, 14.52 m (47.6 ft) ENE of a power pole with metal tag 6s, 10.45 m (34.3 ft) S of a storm drain manhole cover, 8.18 m (26.8 ft) WSW of the NE corner of the building and 1.16 m (3.8 ft) N of the NW corner of the building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8511629 PUBLICATION DATE: 11/06/2014 Name: SAG HARBOR, SHELTER IS. SOUND NY NOAA Chart: 12358 Latitude: 41° 0.2' N ( 41.00330) USGS Quad: GREENPORT Longitude: 72° 17.8' W ( -72.29670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: U 335 1950 DESIGNATION: U 335 MONUMENTATION: Bench Mark disk VM#: 21020 AGENCY: US Coast and Geodetic Survey IDB PID#: KU0112 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 40° 59.7' N ( 40.99500) LONGITUDE: 72° 16.8' W ( -72.28072) The bench mark is a disk set in a concrete monument slightly W of the NW corner of the intersection, 13.97 m (45.8 ft) WNW of the Centerline of Hempstead street, 9.36 m (30.7 ft) NNE of the Centerline of Hampton street, 5.55 m (18.2 ft) E of a power pole with metal Tag 30, 4.08 m (13.4 ft) NW of a fire hydrant and 1.95 m (6.4 ft) E of a 0.45 m (1.5 ft) diameter tree.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8511629 PUBLICATION DATE: 11/06/2014 Name: SAG HARBOR, SHELTER IS. SOUND NY NOAA Chart: 12358 Latitude: 41° 0.2' N ( 41.00330) USGS Quad: GREENPORT Longitude: 72° 17.8' W ( -72.29670) T I D A L D A T U M S Tidal datums at SAG HARBOR, SHELTER IS. SOUND based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: May 2014 - July 2014 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8461490 NEW LONDON, THAMES RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.872 MEAN HIGH WATER MHW = 0.785 North American Vertical Datum NAVD88 = 0.533 MEAN SEA LEVEL MSL = 0.435 MEAN TIDE LEVEL MTL = 0.418 MEAN LOW WATER MLW = 0.051 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 1629 A 2014 2.592 1.807 1629 B 2014 1.890 1.105 1629 C 2014 3.410 2.625 TIDAL 1 RESET 1983 3.893 3.108 U 335 1950 16.532 15.747
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8511629 PUBLICATION DATE: 11/06/2014 Name: SAG HARBOR, SHELTER IS. SOUND NY NOAA Chart: 12358 Latitude: 41° 0.2' N ( 41.00330) USGS Quad: GREENPORT Longitude: 72° 17.8' W ( -72.29670) 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.