U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8724227 PUBLICATION DATE: 02/13/2004
Name: BIG PINE KEY, WEST SIDE
FL
NOAA Chart: 11445 Latitude: 24° 41.4' N ( 24.69000)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.0' W ( -81.38330)
To reach the tidal bench marks from the junction of County Road C-940 (Key Deer
Boulevard) and U.S. Highway 1 in Big Pine, proceed NW on C-940 for 2.7 km (1.7
mi) to the intersection of Watson Boulevard, then turn left and proceed west on
Watson Boulevard for 1.1 km (0.7 mi) to the office for the Key Deer National
Wildlife Refuge. The bench marks are located in the vicinity of the Key Deer
National Wildlife Refuge office. The tide gage and staff were located at the
east end ruins of the old bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BIG PINE RM 1 1935
DESIGNATION: BIG PINE RM 1
MONUMENTATION: Reference Mark disk VM#: 6782
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0207
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 24° 41.5' N ( 24.69170) LONGITUDE: 81° 23.0' W ( -81.38330)
The primary bench mark is a disk set in the top of a concrete monument on the
west side of Big Pine Key, 210 m (690 ft) NW of the Key Deer National Wildlife
Refuge office, 99 m (325 ft) north of the extended centerline of the former
highway, 33 m (108 ft) north of bench mark BIG PINE 1935, and 0.06 m (0.2 ft)
above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8724227 PUBLICATION DATE: 02/13/2004
Name: BIG PINE KEY, WEST SIDE
FL
NOAA Chart: 11445 Latitude: 24° 41.4' N ( 24.69000)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.0' W ( -81.38330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BIG PINE 1935
DESIGNATION: BIG PINE
MONUMENTATION: Triangulation Station disk VM#: 6781
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0206
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 24° 41.5' N ( 24.69170) LONGITUDE: 81° 23.0' W ( -81.38330)
The primary bench mark is a disk set in the top of a concrete monument on the
west side of Big Pine Key, 200.01 m (656.2 ft) NW and across Watson Boulevard
from the Key Deer national Wildlife Refuge Office, 67.00 m (219.8 ft) NNW of the
NW ocrner of the graveled parking area, 59.98 m (196.8 ft) east of the low water
line, 58.00 m (190.3 ft) NW of the centerline of the Boulevard, 42.00 m (137.8
ft) east of the outer mangroves of the west shore, 2.41 m (7.9 ft) WSW of the
center of the trail, and 0.13 m (0.43 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8724227 PUBLICATION DATE: 02/13/2004
Name: BIG PINE KEY, WEST SIDE
FL
NOAA Chart: 11445 Latitude: 24° 41.4' N ( 24.69000)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.0' W ( -81.38330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BIG PINE RM 2 1935
DESIGNATION: BIG PINE RM 2
MONUMENTATION: Reference Mark disk VM#: 6783
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0205
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 24° 41.5' N ( 24.69170) LONGITUDE: 81° 22.9' W ( -81.38170)
The bench mark is a disk set in the top of a concrete monument on the west side
of Big Pine Key, 160 m (525 ft) NW of the Key Deer National Wildlife Refuge
office, 52 m (172 ft) north of the extended centerline of the former highway,
25.48 m (83.6 ft) SE of bench mark BIG PINE 1935, and 0.15 m (0.5 ft) above the
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8724227 PUBLICATION DATE: 02/13/2004
Name: BIG PINE KEY, WEST SIDE
FL
NOAA Chart: 11445 Latitude: 24° 41.4' N ( 24.69000)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.0' W ( -81.38330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Q 273 1966
DESIGNATION: Q 273
MONUMENTATION: Bench Mark disk VM#: 6784
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0204
SETTING CLASSIFICATION: Concrete base for radio tower OPUS PID:
LATITUDE: 24° 41.4' N ( 24.69000) LONGITUDE: 81° 22.8' W ( -81.38000)
The bench mark is a disk set in the top of the SE corner of the concrete base
for a 76 m (250 ft) high radio tower, 137 m (450 ft) SE of the Key Deer National
Wildlife Refuge office, 104 m (342 ft) south of the centerline of the former
highway, and 42 m (138 ft) west of the centerline of the road from the tower to
the former highway.
BENCH MARK STAMPING: 4227 D 1982
DESIGNATION: 872 4227 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 6785
AGENCY: National Ocean Survey (NOS) IDB PID#: AA0908
SETTING CLASSIFICATION: Concrete foundation for hoist OPUS PID:
LATITUDE: 24° 41.4' N ( 24.69000) LONGITUDE: 81° 23.0' W ( -81.38330)
The bench mark is a disk set in the concrete foundation for a boat hoist located
near the Key Deer National Wildlife Refuge office, 20.36 m (66.8 ft) SW of the
SW corner of a garage, 8.96 m (29.4 ft) SE of a light pole, 2.47 m (8.1 ft) west
of the centerline of a boat ramp, 0.21 m (0.7 ft) east of the southernmost boat
hoist, and 1 m (2 ft) above the boat ramp.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8724227 PUBLICATION DATE: 02/13/2004
Name: BIG PINE KEY, WEST SIDE
FL
NOAA Chart: 11445 Latitude: 24° 41.4' N ( 24.69000)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.0' W ( -81.38330)
T I D A L D A T U M S
Tidal datums at BIG PINE KEY, WEST SIDE based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: November 1973 - February 1974
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8724211 BIG PINE KEY VIADUCT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
North American Vertical Datum NAVD88 = 0.369
MEAN HIGHER HIGH WATER MHHW = 0.305
MEAN HIGH WATER MHW = 0.240
MEAN SEA LEVEL MSL = 0.150
MEAN TIDE LEVEL MTL = 0.133
MEAN LOW WATER MLW = 0.027
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
BIG PINE RM 1 1935 0.513 0.273
BIG PINE 1935 0.470 0.230
BIG PINE RM 2 1935 0.460 0.220
Q 273 1966 1.021 0.781
4227 D 1982 0.722 0.482
Foot Notes:
Bench marks Q 273 1966 and 4227 D 1982 are 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 these marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8724227 PUBLICATION DATE: 02/13/2004
Name: BIG PINE KEY, WEST SIDE
FL
NOAA Chart: 11445 Latitude: 24° 41.4' N ( 24.69000)
USGS Quad: SUMMERLAND KEY Longitude: 81° 23.0' W ( -81.38330)
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.