U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 9 Station ID: 8518490 PUBLICATION DATE: 05/16/2011 Name: NEW ROCHELLE NY NOAA Chart: 12367 Latitude: 40° 53.6' N ( 40.89330) USGS Quad: MOUNT VERNON Longitude: 73° 46.9' W ( -73.78170) To reach the tidal bench marks from Exit 15 of Interstate 95 heading north, proceed north on U.S. Highway 1 for 0.2 km (0.1 mi) to Weyman Avenue, turn right onto Weyman Avenue and go 1.3 km (0.8 mi) to Pelham Road, turn left onto Pelham Road and go to Fort Slocum Road, turn right and follow Fort Slocum Road for 0.5 km (0.3 mi) to Fort Slocum Pier (former ferry terminal). The bench marks are along Fort Slocum Road, along Harbor Lane, and on the Glen Island Approach bridge. The tide gage and staff were located on Fort Slocum Pier. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 9 Station ID: 8518490 PUBLICATION DATE: 05/16/2011 Name: NEW ROCHELLE NY NOAA Chart: 12367 Latitude: 40° 53.6' N ( 40.89330) USGS Quad: MOUNT VERNON Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1957 DESIGNATION: TIDAL 1 STA I 45 MONUMENTATION: Tidal Station disk VM#: 2349 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: KU1726 SETTING CLASSIFICATION: Concrete step OPUS PID: LATITUDE: 40° 53.4' N ( 40.89000) LONGITUDE: 73° 46.9' W ( -73.78170) The primary bench mark is a disk set in the top of a concrete step on the NE side and at the east corner of the guard house at Fort Slocum Pier, 0.46 m (1.5 ft) north of the building, 0.30 m (1.0 ft) south of the north edge of the step, and 0.21 m (0.7 ft) west of the east edge of the step.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 9 Station ID: 8518490 PUBLICATION DATE: 05/16/2011 Name: NEW ROCHELLE NY NOAA Chart: 12367 Latitude: 40° 53.6' N ( 40.89330) USGS Quad: MOUNT VERNON Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1957 DESIGNATION: TIDAL 2 STA I 45 MONUMENTATION: Tidal Station disk VM#: 2350 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: KU1724 SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 40° 53.5' N ( 40.89170) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set in the top of a rock outcrop in Neptune Park at the intersection of Harbor Lane and Fort Slocum Road, 9.45 m (31.0 ft) west of the centerline of Fort Slocum Road, 9.11 m (30.0 ft) east of the centerline of a walk, 6.4 m (21 ft) SW of the centerline of Harbor Lane, 4.27 m (14.0 ft) west of the west side of the stone retaining wall along Fort Slocum Road, and level with the ground. BENCH MARK STAMPING: NO 5 1965 DESIGNATION: 851 8490 TIDAL 5 MONUMENTATION: Tidal Station disk VM#: 2351 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 40° 53.6' N ( 40.89330) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set in the top of a rock outcrop along Harbor Lane just west of Neptune Park, 4.36 m (14.3 ft) south of the centerline of Harbor Lane, 2.56 m (8.4 ft) east of a power line pole, and 0.06 m (0.2 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 9 Station ID: 8518490 PUBLICATION DATE: 05/16/2011 Name: NEW ROCHELLE NY NOAA Chart: 12367 Latitude: 40° 53.6' N ( 40.89330) USGS Quad: MOUNT VERNON Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 6 1965 DESIGNATION: 851 8490 TIDAL 6 MONUMENTATION: Tidal Station disk VM#: 2352 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Concrete catch basin OPUS PID: LATITUDE: 40° 53.6' N ( 40.89330) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set in the NW corner of a 3 m x 6 m (10 ft x 20 ft) concrete catch basin at the intersection of Glen Island Approach and Neptune Island Road, 30.5 m (100 ft) east of the Huquenot Yacht Club entrance, 5.5 m (18 ft) south of Harbor Lane, and 0.61 m (2.0 ft) NW of a stand pipe projecting 0.21 m (0.7 ft) above the concrete. BENCH MARK STAMPING: Y 384 1965 DESIGNATION: 851 8490 Y 384 MONUMENTATION: Tidal Station disk VM#: 2353 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: KU1721 SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 40° 53.6' N ( 40.89330) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set on the top and near the NE end of a large exposed bedrock near the east corner of Hudson Park, 55 m (181 ft) SW of the NE side of a dock, 50.75 m (166.5 ft) NW of the SE end of a dock 68.6 m (20.91 m) west of the west corner of the Rowing Club Building, 14.33 m (47.0 ft) north of a power line pole, 0.49 m (1.6 ft) south of the SW end of a rock masonry wall, and 0.76 m (2.5 ft) above the level of the parking area.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 9 Station ID: 8518490 PUBLICATION DATE: 05/16/2011 Name: NEW ROCHELLE NY NOAA Chart: 12367 Latitude: 40° 53.6' N ( 40.89330) USGS Quad: MOUNT VERNON Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8490 H 1977 DESIGNATION: 851 8490 H MONUMENTATION: Tidal Station disk VM#: 2354 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Doorstep OPUS PID: LATITUDE: 40° 53.6' N ( 40.89330) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set in the doorstep leading to the mens toilet room at Neptune Park, 0.15 m (0.5 ft) from the left sidewalk on the north side of the building. BENCH MARK STAMPING: 8490 J 1977 DESIGNATION: 851 8490 J MONUMENTATION: Tidal Station disk VM#: 2355 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete embankment wall OPUS PID: LATITUDE: 40° 53.6' N ( 40.89330) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set in the concrete embankment wall at the east end of Neptune Park, 9.75 m (32.0 ft) north of the south end of the wall, and 4.57 m (15.0 ft) west of the centerline of Fort Slocum Road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 9 Station ID: 8518490 PUBLICATION DATE: 05/16/2011 Name: NEW ROCHELLE NY NOAA Chart: 12367 Latitude: 40° 53.6' N ( 40.89330) USGS Quad: MOUNT VERNON Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 8490 K 1977 DESIGNATION: 851 8490 K MONUMENTATION: Tidal Station disk VM#: 2356 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Doorstep OPUS PID: LATITUDE: 40° 53.6' N ( 40.89330) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set in the doorstep of the bridge house on the Glen Island Approach bridge, 6.71 m (22.0 ft) south of the centerline of Glen Island Approach, and 1.52 m (5.0 ft) east of the NW corner of the building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 9 Station ID: 8518490 PUBLICATION DATE: 05/16/2011 Name: NEW ROCHELLE NY NOAA Chart: 12367 Latitude: 40° 53.6' N ( 40.89330) USGS Quad: MOUNT VERNON Longitude: 73° 46.9' W ( -73.78170) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 851 8490 NO 7 ALIAS: NO STAMPING 1 MONUMENTATION: Tidal Station disk VM#: 2357 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Concrete Sidewalk OPUS PID: LATITUDE: 40° 53.6' N ( 40.89330) LONGITUDE: 73° 46.9' W ( -73.78170) The bench mark is a disk set in the east concrete sidewalk at the center of the Glen Island Approach Bridge leading from New Rochelle to Glen Island, about 137 m (450 ft) SE of Bench Mark NO 6 1965.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 9 Station ID: 8518490 PUBLICATION DATE: 05/16/2011 Name: NEW ROCHELLE NY NOAA Chart: 12367 Latitude: 40° 53.6' N ( 40.89330) USGS Quad: MOUNT VERNON Longitude: 73° 46.9' W ( -73.78170) T I D A L D A T U M S Tidal datums at NEW ROCHELLE based on: LENGTH OF SERIES: 2 YEARS TIME PERIOD: January 1980 - December 1981 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8516990 WILLETS POINT, LITTLE BAY, EAST RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (02/19/1972) = 3.689 MEAN HIGHER HIGH WATER MHHW = 2.410 MEAN HIGH WATER MHW = 2.301 North American Vertical Datum NAVD88 = 1.279 MEAN SEA LEVEL MSL = 1.194 MEAN TIDE LEVEL MTL = 1.190 MEAN LOW WATER MLW = 0.079 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (02/02/1976) = -1.331 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 1 1957 3.537 1.236 NO 2 1957 5.593 3.292 NO 5 1965 4.698 2.397 NO 6 1965 3.806 1.505 Y 384 1965 4.312 2.011 8490 H 1977 3.688 1.387 8490 J 1977 3.949 1.648 8490 K 1977 7.626 5.325 851 8490 NO 7 7.553 5.252 Foot Notes: Bench mark Y 384 1965 is based on one differential leveling connection and does 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 9 of 9 Station ID: 8518490 PUBLICATION DATE: 05/16/2011 Name: NEW ROCHELLE NY NOAA Chart: 12367 Latitude: 40° 53.6' N ( 40.89330) USGS Quad: MOUNT VERNON Longitude: 73° 46.9' W ( -73.78170) 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.