U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8724193 PUBLICATION DATE: 03/09/2004
Name: BOGIE CHANNEL LANDING, BIG PINE KEY
FL
NOAA Chart: 11442 Latitude: 24° 41.8' N ( 24.69670)
USGS Quad: BIG PINE KEY Longitude: 81° 20.9' W ( -81.34830)
To reach the tidal bench marks from the intersection of U.S. Highway 1 and
County Road 940 (Key Deer Boulevard) on Big Pine Key, proceed 2.7 km (1.7 mi) NW
on County Road 940 to Watson Boulevard, then turn right and proceed east on
Watson Boulevard for 2.6 km (1.6 mi), veering right to continue on State Route
4A, to the west end of the bridge over Bogie Channel. The bench marks are
located on the south side of Watson Boulevard near the west side of Bogie
Channel in the vicinity of a boat basin. The tide gage and staff were located
on a piling 100 m (328 ft) north of the west wing wall of the Bogie Channel
bridge.
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 6
Station ID: 8724193 PUBLICATION DATE: 03/09/2004
Name: BOGIE CHANNEL LANDING, BIG PINE KEY
FL
NOAA Chart: 11442 Latitude: 24° 41.8' N ( 24.69670)
USGS Quad: BIG PINE KEY Longitude: 81° 20.9' W ( -81.34830)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: PIKE RM 1 1935
DESIGNATION: PIKE RM 1
MONUMENTATION: Reference Mark disk VM#: 6416
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0244
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 24° 41.9' N ( 24.69830) LONGITUDE: 81° 20.9' W ( -81.34830)
The primary bench mark is a disk set in the top of a concrete post near the west
end of the bridge over Bogie Channel and south of Watson Boulevard, 91 m (300
ft) west of the west bank of Bogie Channel, 40.36 m (132.4 ft) NW of bench mark
D 273 1966, 28 m (93 ft) NW of the NW corner of a two-story frame building used
as a cafe and residence, 12 m (38 ft) east of the centerline of a dirt road, 8 m
(26 ft) south of the centerline of Watson Boulevard, 0.46 m (1.5 ft) west of a
metal witness post, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8724193 PUBLICATION DATE: 03/09/2004
Name: BOGIE CHANNEL LANDING, BIG PINE KEY
FL
NOAA Chart: 11442 Latitude: 24° 41.8' N ( 24.69670)
USGS Quad: BIG PINE KEY Longitude: 81° 20.9' W ( -81.34830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 273 1966
DESIGNATION: D 273
MONUMENTATION: Bench Mark disk VM#: 6417
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA0245
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 24° 41.9' N ( 24.69830) LONGITUDE: 81° 20.9' W ( -81.34830)
The bench mark is a disk set in the top of the west concrete sea wall near the
west end of the bridge over Bogie Channel, in the vicinity of the boat basin, 44
m (145 ft) south of the centerline of Watson Boulevard, 10 m (33 ft) south of
the NW corner of the boat basin, 4 m (14 ft) south of the north end of the sea
wall, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8724193 PUBLICATION DATE: 03/09/2004
Name: BOGIE CHANNEL LANDING, BIG PINE KEY
FL
NOAA Chart: 11442 Latitude: 24° 41.8' N ( 24.69670)
USGS Quad: BIG PINE KEY Longitude: 81° 20.9' W ( -81.34830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4193 D
DESIGNATION: 872 4193 D TIDAL FLDT
ALIAS: NO STAMPING 1
MONUMENTATION: Bench Mark disk VM#: 6418
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AA0902
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 24° 41.8' N ( 24.69670) LONGITUDE: 81° 20.9' W ( -81.34830)
The bench mark is a disk set in the top of the concrete sidewalk at the SW
corner of the bridge, 4 m (14 ft) south of the centerline of Watson Boulevard,
and 0.15 m (0.5 ft) above the highway.
BENCH MARK STAMPING: 4193 E
DESIGNATION: 872 4193 E TIDAL
MONUMENTATION: Bench Mark disk VM#: 6419
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AA0903
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 24° 41.9' N ( 24.69830) LONGITUDE: 81° 20.5' W ( -81.34170)
The bench mark is a disk set in the concrete sidewalk at the east end of the
Bogie Channel bridge, 4.48 m (14.7 ft) north of the centerline of the highway,
0.58 m (1.9 ft) south of the bridge guardrail, 0.37 m (1.2 ft) NW of the
westernmost concrete post for a metal guardrail, and 0.30 m (1 ft) above the
highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8724193 PUBLICATION DATE: 03/09/2004
Name: BOGIE CHANNEL LANDING, BIG PINE KEY
FL
NOAA Chart: 11442 Latitude: 24° 41.8' N ( 24.69670)
USGS Quad: BIG PINE KEY Longitude: 81° 20.9' W ( -81.34830)
T I D A L D A T U M S
Tidal datums at BOGIE CHANNEL LANDING, BIG PINE KEY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: October 1974 - October 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 = 0.403
MEAN HIGHER HIGH WATER MHHW = 0.366
MEAN HIGH WATER MHW = 0.298
MEAN SEA LEVEL MSL = 0.195
MEAN TIDE LEVEL MTL = 0.177
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
PIKE RM 1 1935 0.631 0.333
D 273 1966 0.676 0.378
4193 D 3.146 2.848
4193 E 3.127 2.829
Foot Notes:
Bench mark 4193 E 1982 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 an elevation for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8724193 PUBLICATION DATE: 03/09/2004
Name: BOGIE CHANNEL LANDING, BIG PINE KEY
FL
NOAA Chart: 11442 Latitude: 24° 41.8' N ( 24.69670)
USGS Quad: BIG PINE KEY Longitude: 81° 20.9' W ( -81.34830)
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.