U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8516891 PUBLICATION DATE: 04/15/2014
Name: NORTON POINT, HOOK CREEK
NY
NOAA Chart: 12350 Latitude: 40° 38.1' N ( 40.63500)
USGS Quad: LYNBROOK Longitude: 73° 44.8' W ( -73.74670)
To reach the bench marks from John F. Kennedy (JFK) International Airport,
proceed NW for 2.3 km (1.4 mi) on the JFK Expressway, take the exit to
Interstate 678, keep right at the fork and follow the signs for Rockaway
Boulevard East and Nassau Boulevard, proceed 1.3 km (0.8 mi) SE on Nassau
Boulevard until it becomes Rockaway Boulevard, continue SE for 3.4 km (2.1 mi)
on Rockaway Boulevard to a stoplight, turn right and proceed 0.1 km (0.6 mi)
south on Brookville Boulevard to the intersection with Broad Street, continue
straight onto Broad Street for 0.1 km (0.06 mi) to the intersection with Bayview
Avenue, turn left and proceed 0.15 km (0.09 mi) on Bayview Avenue to the Bay
Waterfront Bar & Grill at 155-57 Bayview Avenue. The bench marks are located
along Hook Creek between the tide gauges and the Meyer Avenue Bridge over Hook
Creek. The tide gauges are located on the restaurant's dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6891 A 2013
DESIGNATION: 851 6891 A
MONUMENTATION: Tidal Station disk VM#: 20956
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: 40° 38.1' N ( 40.63458) LONGITUDE: 73° 44.4' W ( -73.74056)
The primary bench mark is a brass disk set in the NE concrete abutment for the E
Avenue bridge over Hook Creek, 23.20 m (76.1 ft) ENE of where the W end of the
bridge meets some sheet pile, 5.02 m (16.5 ft) NNW of the centerline of E
Avenue, 1.25 m (4.1 ft) WSW of the E most edge of the abutment, 0.21 m (0.6 ft)
SSE of the N edge of the abutment, and 0.18 m (0.6 ft) above the road level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8516891 PUBLICATION DATE: 04/15/2014
Name: NORTON POINT, HOOK CREEK
NY
NOAA Chart: 12350 Latitude: 40° 38.1' N ( 40.63500)
USGS Quad: LYNBROOK Longitude: 73° 44.8' W ( -73.74670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6891 B 2013
DESIGNATION: 851 6891 B
MONUMENTATION: Tidal Station disk VM#: 20957
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID#: BBDK07
LATITUDE: 40° 38.2' N ( 40.63625) LONGITUDE: 73° 44.5' W ( -73.74186)
The bench mark is a brass disk set in the top concrete step on the E side of the
Meyer Avenue footbridge over Hook Creek, 29.73 m (97.5 ft) WNW of the center of
the intersection of Meyer Avenue and 1st Street, 5.22 m (17.1 ft) ESE of the E
most bridge piling on the south side of the bridge, 1.40 m (4.5 ft) S of the
center line of the bridge, 0.18 m (0.6 ft) ESE of the W edge of the concrete
steps, 0.17 m (0.6 ft) NNE of the S edge of the concrete steps, and 0.46 m (1.5
ft) above the road level.
BENCH MARK STAMPING: 6891 C 2013
DESIGNATION: 851 6891 C
MONUMENTATION: Tidal Station disk VM#: 20958
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete backfill steel sheet pile
seawall OPUS PID:
LATITUDE: 40° 38.2' N ( 40.63739) LONGITUDE: 73° 44.5' W ( -73.74097)
The bench mark is a brass disk set in the top of the concrete backfill of the
steel sheet pile seawall along Hook Creek near the intersection of Rockaway
Boulevard and Division Street, 22.60 m (74.1 ft) NNW of the S end of seawall,
11.58 m (38.0 ft) SSE of the center of a drain pipe set in the top of seawall,
3.89 m (12.8 ft) WNW of the SW curb of Rockaway Boulevard, and 0.86 m (2.8 ft)
below the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8516891 PUBLICATION DATE: 04/15/2014
Name: NORTON POINT, HOOK CREEK
NY
NOAA Chart: 12350 Latitude: 40° 38.1' N ( 40.63500)
USGS Quad: LYNBROOK Longitude: 73° 44.8' W ( -73.74670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6891 D 2013
DESIGNATION: 851 6891 D
MONUMENTATION: Tidal Station disk VM#: 20959
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Large concrete block footing OPUS PID:
LATITUDE: 40° 38.3' N ( 40.63872) LONGITUDE: 73° 44.7' W ( -73.74447)
The bench mark is a brass disk set in the top of the concrete foundation of a
recycling building built out conex shipping containers and located along
Bayview Avenue, 14.60 m (47.9 ft) NE of the center of the intersection of Broad
Street and Bayview Avenue, 12.10 m (39.7 ft) N of power pole #P4, 6.80 m (22.3
ft) WNW of power pole support #4S, 4.41 m (14.4 ft) ESE of the SW corner of
recycling building, and 0.62 m (2.0 ft) above the street level.
BENCH MARK STAMPING: 6891 E 2013
DESIGNATION: 851 6891 E
MONUMENTATION: Tidal Station disk VM#: 20960
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Large concrete block wall OPUS PID:
LATITUDE: 40° 38.3' N ( 40.63778) LONGITUDE: 73° 44.7' W ( -73.74489)
The bench mark is a brass disk set in the top of a concrete wall with a
chain-link fence that is along the E side of Bayview Avenue, 26.20 m (86.0 ft)
SSW of a gate going through the concrete wall, 11.59 m (38.0 ft) E of the front
door of the house at 155-46 Bayview Avenue, 3.45 m (11.3 ft) E of the Bayview
Avenue centerline, 2.48 m (8.1 ft) N of the S end of the wall, and 0.89 m (2.9
ft) above the street level .
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8516891 PUBLICATION DATE: 04/15/2014
Name: NORTON POINT, HOOK CREEK
NY
NOAA Chart: 12350 Latitude: 40° 38.1' N ( 40.63500)
USGS Quad: LYNBROOK Longitude: 73° 44.8' W ( -73.74670)
T I D A L D A T U M S
Tidal datums at NORTON POINT, HOOK CREEK based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: September 2013 - December 2013
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8531680 SANDY HOOK
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.887
MEAN HIGH WATER MHW = 1.783
MEAN SEA LEVEL MSL = 0.932
MEAN TIDE LEVEL MTL = 0.924
MEAN LOW WATER MLW = 0.064
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6891 A 2013 3.658 1.875
6891 B 2013 2.854 1.071
6891 C 2013 2.715 0.932
6891 D 2013 3.088 1.305
6891 E 2013 3.317 1.534
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8516891 PUBLICATION DATE: 04/15/2014
Name: NORTON POINT, HOOK CREEK
NY
NOAA Chart: 12350 Latitude: 40° 38.1' N ( 40.63500)
USGS Quad: LYNBROOK Longitude: 73° 44.8' W ( -73.74670)
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.