U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8518934 PUBLICATION DATE: 12/04/2014
Name: BEACON, FLUSHKILL, HUDSON RIVER
NY
NOAA Chart: 12343 Latitude: 41° 30.0' N ( 41.50000)
USGS Quad: WAPPINGERS FALLS Longitude: 73° 59.0' W ( -73.98330)
To reach the station from the east end of the i-84 hamilton fish newburgh-beacon
bridge over the hudson river, take exit 11 for new york 9d toward beacon /
wappinger falls and proceed 0.3 km (0.2 mi) east to ny-9d, turn right and
proceed 1.1 km (0.7 mi) south on ny-9d / north avenue to beekman road, turn
right and proceed 0.8 km (0.5 mi) sw on beekman road to beekman street north,
turn right onto beekman street north and proceed 0.1 km (0.06 mi) west over the
metro north railroad, continue north 0.2 km (0.1 mi) onto red flynn drive and
the beacon train station on the right and the beacon ferry terminal and the tide
station on the left. The bench marks are in the vicinity of the tide station
and along red flynn drive.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8934 D 2014
DESIGNATION: 851 8934 D
MONUMENTATION: Flange-encased Rod VM#: 21062
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBDM21
LATITUDE: 41° 30.3' N ( 41.50500) LONGITUDE: 73° 59.1' W ( -73.98539)
The primary bench mark is a flange encased rod set in the grass slope along the
W side of Red Flynn drive, 56.17 m (184.3 ft) ENE of the support pole at the SE
corner of the scenic Hudson River center building, 20.07 m (65.8 ft) WSW of the
fifth unmarked light pole along Red Flynn drive N of long dock road, 18.68 m
(61.3 ft) SE of the bank of the Hudson River, 16.78 m (55.1 ft) NW of the fourth
unmarked light pole along Red Flynn drive N of long dock road, and 12.51 m (41.0
ft) SW of a 0.23 m (0.8 ft) diameter tree in the grass.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8518934 PUBLICATION DATE: 12/04/2014
Name: BEACON, FLUSHKILL, HUDSON RIVER
NY
NOAA Chart: 12343 Latitude: 41° 30.0' N ( 41.50000)
USGS Quad: WAPPINGERS FALLS Longitude: 73° 59.0' W ( -73.98330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8934 E 2014
DESIGNATION: 851 8934 E
MONUMENTATION: Bench Mark disk VM#: 21063
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Wall of a bridge OPUS PID:
LATITUDE: 41° 30.3' N ( 41.50428) LONGITUDE: 73° 59.1' W ( -73.98497)
The bench mark is a disk set in the NW wing wall of the bridge, 8.78 m (28.8 ft)
ESE of the circular metal beacon kiosk, 6.18 m (20.3 ft) W of the centerline of
Beekman street N, 3.60 m (11.8 ft) NE of the far end of the wing wall, 0.74 m
(2.4 ft) W of the concrete bridge guard wall, and 2.50 m (8.2 ft) higher than
the ground underneath the bridge.
BENCH MARK STAMPING: 8934 C 2014
DESIGNATION: 851 8934 C
MONUMENTATION: Bench Mark disk VM#: 21064
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete base of the dock OPUS PID:
LATITUDE: 41° 30.3' N ( 41.50564) LONGITUDE: 73° 59.1' W ( -73.98556)
The bench mark is a disk set in the SW corner of the concrete base of the Beacon
Ferry dock, 30.47 m (100.0 ft) NW of a fire hydrant, 15.81 m (51.9 ft) S of the
N side of the dock, 6.68 m (21.9 ft) W of a light pole at the SW corner of the
brick paved area, 0.29 m (1.0 ft) E of the wooden dock and 0.27 m (0.9 ft) N of
the S side of the dock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8518934 PUBLICATION DATE: 12/04/2014
Name: BEACON, FLUSHKILL, HUDSON RIVER
NY
NOAA Chart: 12343 Latitude: 41° 30.0' N ( 41.50000)
USGS Quad: WAPPINGERS FALLS Longitude: 73° 59.0' W ( -73.98330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8934 B 2014
DESIGNATION: 851 8934 B
MONUMENTATION: Bench Mark disk VM#: 21065
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Exposed building foundation OPUS PID:
LATITUDE: 41° 30.4' N ( 41.50597) LONGITUDE: 73° 59.1' W ( -73.98489)
The bench mark is a disk set in the concrete wall N of the stairs underneath the
train tracks, 15.88 m (52.1 ft) N of the NW support post of the roof over the
stairs, 10.23 m (33.6 ft) S of the corner of the fence along the railroad
tracks, 3.04 m (10.0 ft) W of the concrete retaining wall along the railroad
tracks, 1.60 m (5.2 ft) E of the curb face along the E side of the parking lot,
and 0.82 m (2.7 ft) above the sidewalk.
BENCH MARK STAMPING: 8934 A 2014
DESIGNATION: 851 8934 A
MONUMENTATION: Bench Mark disk VM#: 21066
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete headwall for a culvert OPUS PID:
LATITUDE: 41° 30.5' N ( 41.50761) LONGITUDE: 73° 59.1' W ( -73.98531)
The bench mark is set in the concrete headwall of a culvert on the W side of red
flynn drive, 39.21 m (128.6 ft) N of a 0.7 m (2.3 ft) diameter tree in the grass
on the W side of the road, 29.76 m (97.6 ft) S of a power pole with metal tag
nyt9, 23.83 m (78.2 ft) ESE of a steel post and water faucet on a concrete slab,
4.30 m (14.1 ft) W of the centerline of the road, 2.01 m (6.6 ft) NW of the SE
end of the headwall and 0.17 m (0.6 ft) SE of the NW end of the headwall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8518934 PUBLICATION DATE: 12/04/2014
Name: BEACON, FLUSHKILL, HUDSON RIVER
NY
NOAA Chart: 12343 Latitude: 41° 30.0' N ( 41.50000)
USGS Quad: WAPPINGERS FALLS Longitude: 73° 59.0' W ( -73.98330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Y 56 1955
DESIGNATION: Y 56
MONUMENTATION: Bench Mark disk VM#: 21067
AGENCY: US Coast and Geodetic Survey IDB PID#: LX1360
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 41° 30.2' N ( 41.50269) LONGITUDE: 73° 59.1' W ( -73.98422)
The bench mark is a vertical disk set in the rock cut on the E side of the
railroad tracks, 133.0 m (436.4 ft) S of the Beekman street N overpass, 32.2 m
(105.6 ft) E of a power pole on the W side of the railroad tracks, 20.4 m (66.9
ft) NNE of a power pole near a derail, and 8.8 m (28.9 ft) E of the E rail of
the spur tracks, and 0.56 m (1.8 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8518934 PUBLICATION DATE: 12/04/2014
Name: BEACON, FLUSHKILL, HUDSON RIVER
NY
NOAA Chart: 12343 Latitude: 41° 30.0' N ( 41.50000)
USGS Quad: WAPPINGERS FALLS Longitude: 73° 59.0' W ( -73.98330)
T I D A L D A T U M S
Tidal datums at BEACON, FLUSHKILL, HUDSON RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: May 2014 - July 2014
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8518750 THE BATTERY, NEW YORK HARBOR
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.118
MEAN HIGH WATER MHW = 1.011
MEAN SEA LEVEL MSL = 0.553
MEAN TIDE LEVEL MTL = 0.534
MEAN LOW WATER MLW = 0.057
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8934 D 2014 4.311 3.300
8934 E 2014 11.043 10.032
8934 C 2014 1.968 0.957
8934 B 2014 3.215 2.204
8934 A 2014 2.155 1.144
Y 56 1955 4.843 3.832
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8518934 PUBLICATION DATE: 12/04/2014
Name: BEACON, FLUSHKILL, HUDSON RIVER
NY
NOAA Chart: 12343 Latitude: 41° 30.0' N ( 41.50000)
USGS Quad: WAPPINGERS FALLS Longitude: 73° 59.0' W ( -73.98330)
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.