U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8512451 PUBLICATION DATE: 09/27/2017 Name: PONQUOGUE POINT, SHINNECOCK BAY NY NOAA Chart: 12353 Latitude: 40° 51.0' N ( 40.85000) USGS Quad: QUOGUE Longitude: 72° 30.2' W ( -72.50330) To reach the tidal bench marks by car from the intersection of Montauk Highway and Ponquogue Avenue in Hampton Bays, proceed south on Ponquogue Avenue 2.4 km (1.5 mi) to the T intersection with Shinnecock Road, turn left onto Shinnecock Road and proceed east 0.8 km (0.5 mi) to the intersection with Foster Avenue, turn right onto Foster Avenue and proceed south 0.6 km (0.4 mi) to the entrance gate on the left for the United States Coast Guard Station Shinnecock. The tide gauge is located on the north side of the USCG boat basin and the bench marks are on the USCG grounds and south along the old Ponquogue Bridge alignment. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 2451 A 1989 DESIGNATION: 851 2451 A MONUMENTATION: Bench Mark disk VM#: 7439 AGENCY: National Ocean Survey/Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete base OPUS PID: LATITUDE: 40° 51.0' N ( 40.84958) LONGITUDE: 72° 30.2' W ( -72.50356) The primary bench mark is a disk set in concrete pad of the United States Coast Guard Shinnecock Station flagpole, 37.83 m (124.1 ft) N of the NW corner of main USCG building, 37.15 m (121.9 ft) W of the boat basin bulkhead, 9.02 m (29.6 ft) S of the mounted bell embossed Gregory Cannon Street New York 1890. , and 7.70 m (25.3 ft) E of the E edge of pavement of the entrance road leading to the main USCG building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8512451 PUBLICATION DATE: 09/27/2017 Name: PONQUOGUE POINT, SHINNECOCK BAY NY NOAA Chart: 12353 Latitude: 40° 51.0' N ( 40.85000) USGS Quad: QUOGUE Longitude: 72° 30.2' W ( -72.50330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 3 1933 RESET 1943 DESIGNATION: TIDAL 3 STA II 55 RESET MONUMENTATION: Bench Mark disk VM#: 7436 AGENCY: United States Coast and Geodetic Survey (USC&GS) IDB PID#: KU0419 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 40° 50.8' N ( 40.84725) LONGITUDE: 72° 30.1' W ( -72.50231) The bench mark is a disk set in a concrete monument S of the United States Coast Guard Shinnecock station and along the W side of the road to the old Ponquogoe Bridge alignment, 64.85 m (212.8 ft) SSW of the SW corner of the USCG chain link fence where it turns E towards the water, 24.65 m (80.9 ft) NE of power pole #26, 9.01 m (29.6 ft) SSW of a hinged gate post blocking vehicle access, 3.11 m (10.2 ft) SSE of power pole #27, and 6 cm (0.2 ft) below the pavement. BENCH MARK STAMPING: W 320 1943 DESIGNATION: 851 2451 W 320 1943 MONUMENTATION: Survey disk VM#: 7437 AGENCY: National Ocean Survey/Service (NOS) IDB PID#: KU0415 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 40° 51.0' N ( 40.85000) LONGITUDE: 72° 30.2' W ( -72.50331) The bench mark is a disk set in a concrete monument in the NE quarter of the intersection of Ponquogue and Bay Avenues, 2.3 km (1.4 mi) SE along Ponquogue Avenue from the Post Office at Hampton Bays, 18 m (58 ft) north of the centerline of Bay Avenue, 10 m (33 ft) east of the centerline of Ponquogue Avenue, 3 m (11 ft) SE of NYT power pole #16 S, and 0.1 m (0.3 ft).
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8512451 PUBLICATION DATE: 09/27/2017 Name: PONQUOGUE POINT, SHINNECOCK BAY NY NOAA Chart: 12353 Latitude: 40° 51.0' N ( 40.85000) USGS Quad: QUOGUE Longitude: 72° 30.2' W ( -72.50330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: PONQ NO 1 1965 DESIGNATION: 851 2451 PONQ NO 1 1965 MONUMENTATION: Reference Mark disk VM#: 7438 AGENCY: United States Coast and Geodetic Survey (USC&GS) IDB PID#: AE4707 SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 40° 50.9' N ( 40.84892) LONGITUDE: 72° 30.2' W ( -72.50297) The bench mark is a disk set in the concrete pad near the SW corner of the boat basin at the US Coast Guard Shinnecock station, 34.79 m (114.1 ft) SE of the SE corner of the one story addition on the S side of the USCG main building, 3.67 m (12.0 ft) N of the S edge of the concrete pad, and 0.56 m (1.8 ft) E of the W edge of the concrete pad. BENCH MARK STAMPING: 2451 B 1989 DESIGNATION: 851 2451 B 1989 MONUMENTATION: Survey disk VM#: 7440 AGENCY: National Ocean Survey/Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 40° 51.0' N ( 40.85000) LONGITUDE: 72° 30.2' W ( -72.50331) The bench mark is a disk set flush in the concrete foundation of the Coast Guard boat house, 18.56 m (60.9 ft) SSW of the bulkhead, 5.73 m (18.8 ft) ESE of the NW corner of the building, and 0.21 m (0.7 ft) ESE of the NW edge of the westernmost garage-type door along the north side of the building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8512451 PUBLICATION DATE: 09/27/2017 Name: PONQUOGUE POINT, SHINNECOCK BAY NY NOAA Chart: 12353 Latitude: 40° 51.0' N ( 40.85000) USGS Quad: QUOGUE Longitude: 72° 30.2' W ( -72.50330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 2451 C 1989 DESIGNATION: 851 2451 C MONUMENTATION: Bench Mark disk VM#: 7441 AGENCY: National Ocean Survey/Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete footing OPUS PID#: BBDG82 LATITUDE: 40° 51.0' N ( 40.85072) LONGITUDE: 72° 30.3' W ( -72.50425) The bench mark is a disk set in a 0.58 m (1.9 ft) by 0.61 m (2.0 ft) concrete footing for an antenna tower that has been removed on the N side of the United States Coast Guard Shinnecock Station grounds, 59.45 m (195.0 ft) NW of the NW corner of the USCG boathouse, 37.02 m (121.5 ft) E of the W most power pole inside the N fence of the USCG grounds, 19.23 m (63.1 ft) W of the SW corner of a small brick building W of the basketball court and N of the softball field, and 10.87 m (35.7 ft) WSW of the second power pole E along the N fence.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8512451 PUBLICATION DATE: 09/27/2017 Name: PONQUOGUE POINT, SHINNECOCK BAY NY NOAA Chart: 12353 Latitude: 40° 51.0' N ( 40.85000) USGS Quad: QUOGUE Longitude: 72° 30.2' W ( -72.50330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: USCG NY2 2013 DESIGNATION: USCG NY2 MONUMENTATION: Bench Mark disk VM#: 20912 AGENCY: USCG IDB PID#: SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 40° 51.0' N ( 40.85047) LONGITUDE: 72° 30.2' W ( -72.50342) The bench mark is a disk set in a concrete pad on the N side of the United States Coast Guard Shinnecock Station grounds, 25.70 m (84.3 ft) ENE of NW corner of the USCG boathouse, 25.42 m (83.4 ft) SSE of the NW inside corner of the boat basin bulkhead, 11.85 m (38.9 ft) N of the E side of the E most overhead garage door on the N side of the USCG boathouse, 0.85 m (2.8 ft) N of the S edge of the concrete pad, and 0.42 m (1.4 ft) W of the E edge of the concrete pad.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8512451 PUBLICATION DATE: 09/27/2017 Name: PONQUOGUE POINT, SHINNECOCK BAY NY NOAA Chart: 12353 Latitude: 40° 51.0' N ( 40.85000) USGS Quad: QUOGUE Longitude: 72° 30.2' W ( -72.50330) T I D A L D A T U M S Tidal datums at PONQUOGUE POINT, SHINNECOCK BAY based on: LENGTH OF SERIES: 1 YEAR TIME PERIOD: July 1989 - June 1990 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8510560 MONTAUK, FORT POND BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (01/03/2014) = 1.699 MEAN HIGHER HIGH WATER MHHW = 0.970 MEAN HIGH WATER MHW = 0.892 North American Vertical Datum NAVD88 = 0.554 MEAN TIDE LEVEL MTL = 0.465 MEAN SEA LEVEL MSL = 0.463 MEAN LOW WATER MLW = 0.039 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (11/12/1990) = -0.530 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 2451 A 1989 2.917 2.025 NO 3 1933 RESET 1943 1.676 0.784 W 320 1943 7.282 6.390 PONQ NO 1 1965 2.227 1.335 2451 B 1989 2.494 1.601 2451 C 1989 2.793 1.901 USCG NY2 2013 2.207 1.315 Foot Notes: Bench mark W 320 1943 is based on one differential leveling connection and do not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8512451 PUBLICATION DATE: 09/27/2017 Name: PONQUOGUE POINT, SHINNECOCK BAY NY NOAA Chart: 12353 Latitude: 40° 51.0' N ( 40.85000) USGS Quad: QUOGUE Longitude: 72° 30.2' W ( -72.50330) 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.