U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8724154 PUBLICATION DATE: 02/26/2004
Name: LITTLE PINE KEY SOUTH
FL
NOAA Chart: 11445 Latitude: 24° 42.8' N ( 24.71330)
USGS Quad: BIG PINE KEY Longitude: 81° 18.2' W ( -81.30330)
To reach the tidal bench marks by boat from the Bogie Channel Bridge linking
Doctors Point on Big Pine Key to No Name Key, proceed ENE for 5.1 km (3.2
statute mi) to the southernmost tip of Little Pine Key. The bench marks are
located on the key. The tide gage and staff were located on the Government
Wildlife Refuge Wharf.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: ENIP NO 1 1935
DESIGNATION: ENIP RM 1
MONUMENTATION: Reference Mark disk VM#: 6381
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AE4391
SETTING CLASSIFICATION: Concrete in bedrock OPUS PID:
LATITUDE: 24° 42.8' N ( 24.71330) LONGITUDE: 81° 18.2' W ( -81.30330)
The primary bench mark is a disk set in concrete bonded to bedrock, 19.26 m
(63.2 ft) ESE of bench mark ENIP 1935, 0.30 m (1.0 ft) SW of a witness post, and
0.06 m (0.2 ft) above the rock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8724154 PUBLICATION DATE: 02/26/2004
Name: LITTLE PINE KEY SOUTH
FL
NOAA Chart: 11445 Latitude: 24° 42.8' N ( 24.71330)
USGS Quad: BIG PINE KEY Longitude: 81° 18.2' W ( -81.30330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: ENIP 1935
DESIGNATION: ENIP
MONUMENTATION: Triangulation Station disk VM#: 6380
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AA1518
SETTING CLASSIFICATION: Concrete in bedrock OPUS PID:
LATITUDE: 24° 42.9' N ( 24.71500) LONGITUDE: 81° 18.1' W ( -81.30170)
The bench mark is a disk set in concrete bonded to the bedrock located on the
south point of Little Pine Key in a clearing fringed on the water side by
mangroves, and 0.49 m (1.6 ft) south of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8724154 PUBLICATION DATE: 02/26/2004
Name: LITTLE PINE KEY SOUTH
FL
NOAA Chart: 11445 Latitude: 24° 42.8' N ( 24.71330)
USGS Quad: BIG PINE KEY Longitude: 81° 18.2' W ( -81.30330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: ENIP NO 2 1935
DESIGNATION: ENIP RM 2
MONUMENTATION: Reference Mark disk VM#: 6382
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AE4392
SETTING CLASSIFICATION: Concrete in bedrock OPUS PID:
LATITUDE: 24° 42.8' N ( 24.71330) LONGITUDE: 81° 18.2' W ( -81.30330)
The bench mark is a disk set in concrete bonded to the bedrock located in the
southern part of the key, 40.54 m (133.0 ft) WSW of bench mark ENIP NO 1 1935,
28.07 m (92.1 ft) SW of bench mark ENIP 1935, and 0.55 m (1.8 ft) south of a
witness post.
BENCH MARK STAMPING: NO 4 1974
DESIGNATION: 872 4154 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 6383
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 24° 42.8' N ( 24.71330) LONGITUDE: 81° 18.2' W ( -81.30330)
The bench mark is a disk located on the southern tip of a small berm, 58 m (190
ft) SSW of bench mark NO 5 1974, and 6 m (20 ft) from the inner mangrove fringe.
The bench mark is crimped to the top of a copper-clad steel rod driven an
unspecified depth to refusal, encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8724154 PUBLICATION DATE: 02/26/2004
Name: LITTLE PINE KEY SOUTH
FL
NOAA Chart: 11445 Latitude: 24° 42.8' N ( 24.71330)
USGS Quad: BIG PINE KEY Longitude: 81° 18.2' W ( -81.30330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 5 1974
DESIGNATION: 872 4154 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 6384
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 24° 42.8' N ( 24.71330) LONGITUDE: 81° 18.2' W ( -81.30330)
The bench mark is a disk located 58 m (190 ft) NNE of bench mark NO 4 1974,
32.80 m (107.6 ft) SSW of bench mark 4154 F 1984, and 0.27 m (0.9 ft) SE of a
witness post. The bench mark is crimped to the top of a copper-clad steel rod
driven an unspecified depth to refusal, encased in a PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 4154 F 1984
DESIGNATION: 872 4154 F
MONUMENTATION: Tidal Station disk VM#: 6385
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 24° 42.8' N ( 24.71330) LONGITUDE: 81° 18.2' W ( -81.30330)
The bench mark is a disk located set in a clearing, 67 m (220 ft) SW of bench
mark ENIP NO 1 1935, 39.17 m (128.5 ft) SSW of bench mark ENIP NO 2 1935, and
0.21 m (0.7 ft) SW of a witness post. The bench mark is set 0.52 m (1.7 ft)
above ground level, crimped to the top of a stainless steel rod driven 5.5 m (18
ft) to refusal, encased in a 6-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8724154 PUBLICATION DATE: 02/26/2004
Name: LITTLE PINE KEY SOUTH
FL
NOAA Chart: 11445 Latitude: 24° 42.8' N ( 24.71330)
USGS Quad: BIG PINE KEY Longitude: 81° 18.2' W ( -81.30330)
T I D A L D A T U M S
Tidal datums at LITTLE PINE KEY SOUTH based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: August 1974 - August 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:
MEAN HIGHER HIGH WATER MHHW = 0.338
MEAN HIGH WATER MHW = 0.255
MEAN SEA LEVEL MSL = 0.181
MEAN TIDE LEVEL MTL = 0.155
MEAN LOW WATER MLW = 0.055
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
ENIP NO 1 1935 0.374 0.119
ENIP 1935 0.458 0.203
ENIP NO 2 1935 0.475 0.220
NO 4 1974 0.553 0.298
NO 5 1974 0.507 0.252
4154 F 1984 0.246 -0.009
Foot Notes:
Bench mark 4154 F 1984 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: 8724154 PUBLICATION DATE: 02/26/2004
Name: LITTLE PINE KEY SOUTH
FL
NOAA Chart: 11445 Latitude: 24° 42.8' N ( 24.71330)
USGS Quad: BIG PINE KEY Longitude: 81° 18.2' W ( -81.30330)
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.