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Datums Page Page 1 of 5
Station ID: 8724215 PUBLICATION DATE: 04/29/2004
Name: NEWFOUND HARBOR
FL
NOAA Chart: 11442 Latitude: 24° 39.1' N ( 24.65170)
USGS Quad: BIG PINE KEY Longitude: 81° 22.5' W ( -81.37500)
To reach the tidal bench marks from the Post Office in Big Pine Key, proceed SW
on U.S. Highway 1 for 0.2 km (0.1 mi) to Newfound Harbor Road, then south on
Newfound Harbor Road for 2.9 km (1.8 mi) to Newfound Harbor Marine Institute.
The bench marks are in the immediate vicinity of the Newfound Harbor Marine
Institute. The tide gage and staff were located on the SW shore of Big Pine
Key.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1974
DESIGNATION: 872 4215 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 6465
AGENCY: National Ocean Survey (NOS) IDB PID#: AA0798
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 22.5' W ( -81.37500)
The primary bench mark is a disk set in the concrete sea wall, 11 m (35 ft) west
of telephone pole PK-8-106, and 1.71 m (5.6 ft) NE of the south corner of the
boat basin.
BENCH MARK STAMPING: NO 2 1974
DESIGNATION: 872 4215 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 6466
AGENCY: National Ocean Survey (NOS) IDB PID#: AA0797
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 22.5' W ( -81.37500)
The bench mark is a disk set in the concrete sea wall, 28.86 m (94.7 ft) NE of
the south corner of the boat basin, and 27.61 m (90.6 ft) west of the west
corner of a small wooden building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8724215 PUBLICATION DATE: 04/29/2004
Name: NEWFOUND HARBOR
FL
NOAA Chart: 11442 Latitude: 24° 39.1' N ( 24.65170)
USGS Quad: BIG PINE KEY Longitude: 81° 22.5' W ( -81.37500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1974
DESIGNATION: 872 4215 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 6467
AGENCY: National Ocean Survey (NOS) IDB PID#: AA0796
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 22.5' W ( -81.37500)
The bench mark is a disk set on the boat hoist concrete slab, 63.15 m (207.2 ft)
NE of the south corner of the boat basin, 49.80 m (163.4 ft) SE of the NE end of
the east sea wall, 0.40 m (1.3 ft) north of the south corner of the concrete
slab, and 0.15 m (0.5 ft) above ground.
BENCH MARK STAMPING: NO 4 1974
DESIGNATION: 872 4215 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 6468
AGENCY: National Ocean Survey (NOS) IDB PID#: AA0795
SETTING CLASSIFICATION: Concrete walkway OPUS PID:
LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 22.5' W ( -81.37500)
The bench mark is a disk set in the concrete walkway of the east concrete sea
wall, 83.48 m (273.9 ft) NE of the south corner of the boat basin, 29.47 m (96.7
ft) SW of the NE end of the east sea wall, and 16.49 m (54.1 ft) west of the
north corner of the two-story office building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8724215 PUBLICATION DATE: 04/29/2004
Name: NEWFOUND HARBOR
FL
NOAA Chart: 11442 Latitude: 24° 39.1' N ( 24.65170)
USGS Quad: BIG PINE KEY Longitude: 81° 22.5' W ( -81.37500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 5 1974
DESIGNATION: 872 4215 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 6469
AGENCY: National Ocean Survey (NOS) IDB PID#: AA0794
SETTING CLASSIFICATION: Concrete walkway OPUS PID:
LATITUDE: 24° 39.1' N ( 24.65170) LONGITUDE: 81° 22.5' W ( -81.37500)
The bench mark is a disk set in the concrete walkway of the west concrete sea
wall of the boat ramp, 18.47 m (60.6 ft) SW of the NE and of the west sea wall
for the main boat ramp, and 12 m (40 ft) SE of the SE edge of a small boat ramp.
BENCH MARK STAMPING: 4215 F 1982
DESIGNATION: 872 4215 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 6470
AGENCY: National Ocean Survey (NOS) IDB PID#: AA0793
SETTING CLASSIFICATION: Concrete walkway OPUS PID:
LATITUDE: 24° 40.2' N ( 24.67000) LONGITUDE: 81° 22.5' W ( -81.37500)
The bench mark is a disk set in the concrete walkway of the boat ramp sea wall
located at 150 Newfound Harbor Road, 1.9 km (1.2 mi) north of Newfound Harbor
Marine Institute, 7.74 m (25.4 ft) NW of the NE corner of the house at 150
Newfound Harbor Road, 6 m (20 ft) NNE of the NW corner of the house, and 5.33 m
(17.5 ft) south of the NW corner of the boat ramp sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8724215 PUBLICATION DATE: 04/29/2004
Name: NEWFOUND HARBOR
FL
NOAA Chart: 11442 Latitude: 24° 39.1' N ( 24.65170)
USGS Quad: BIG PINE KEY Longitude: 81° 22.5' W ( -81.37500)
T I D A L D A T U M S
Tidal datums at NEWFOUND HARBOR based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: January 1975 - January 1975
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8724138 BAHIA HONDA KEY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
North American Vertical Datum NAVD88 = 0.477
MEAN HIGHER HIGH WATER MHHW = 0.448
MEAN HIGH WATER MHW = 0.376
MEAN TIDE LEVEL MTL = 0.206
MEAN SEA LEVEL MSL = 0.205
MEAN LOW WATER MLW = 0.036
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1974 1.253 0.877
NO 2 1974 1.273 0.897
NO 3 1974 1.279 0.903
NO 4 1974 0.846 0.470
NO 5 1974 0.866 0.490
4215 F 1982 1.313 0.937
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8724215 PUBLICATION DATE: 04/29/2004
Name: NEWFOUND HARBOR
FL
NOAA Chart: 11442 Latitude: 24° 39.1' N ( 24.65170)
USGS Quad: BIG PINE KEY Longitude: 81° 22.5' W ( -81.37500)
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.
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Station Location
Published bench mark
Unpublished bench mark