U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 09/15/1988
Station ID: 8723506 SUPERCEDED DATE: 04/21/2003
Name: PUMPKIN KEY, CARD SOUND
FLORIDA
NOAA Chart: 11463 Latitude: 25° 19.5' N
USGS Quad: CARD SOUND Longitude: 80° 17.6' W
To reach the tidal bench marks from the interchange of the Florida Turnpike and
U.S. Highway 1 in Florida City, proceed north on U.S. Highway 1 for 0.6 mile
(1.0 km) to Lucy Street, then east on Lucy Street for 8.8 miles (14.2 km) to the
boat ramp at Biscayne National Park, proceed by boat SSE for 9.8 miles (15.8 km)
to Pumpkin Key. The bench marks are on the north, east, and south shores of
Pumpkin Key. The tide gage and staff were on the west end of the northernmost
boat pier located on the south end of the Key.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3506 D 1987
MONUMENTATION: Survey Disk VM#: 5883
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is set in the sidewalk north of the north end of the boat dock
walkway at the south end of Pumpkin Key, 66.4 feet (20.2 m) WSW of a flag pole,
65.9 feet (20.1 m) WSW of Bench Mark 3506 E 1987, 38.3 feet (11.7 m) south of
the SW corner of a small lounge, 36.2 feet (11.0 m) SW of the NW corner of a
boat basin with a davit, and 1.4 feet (0.4 m) SE of the NW corner of the dock
walkway.
BENCH MARK STAMPING: 3506 E 1987
MONUMENTATION: Survey Disk VM#: 5884
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set in the west end of the flagpole foundation at the south
end of Pumpkin Key, 36.8 feet (11.2 m) SW of the SE corner of the office, 34.4
feet (10.5 m) east of the NW corner of the boat basin with a davit, 0.9 foot
(0.3 m) WNW of the flag pole, and 0.3 foot (0.1 m) below the surface of the
gravel around the flagpole base.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 09/15/1988
Station ID: 8723506 SUPERCEDED DATE: 04/21/2003
Name: PUMPKIN KEY, CARD SOUND
FLORIDA
NOAA Chart: 11463 Latitude: 25° 19.5' N
USGS Quad: CARD SOUND Longitude: 80° 17.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3506 F 1987
MONUMENTATION: Survey Disk VM#: 5885
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is at the SE end of Pumpkin Key near a golf cart road, about 365
feet (111 m) NE along the golf cart road from the flagpole at the south end of
the key, 11.2 feet (3.4 m) SE of a 2.0-foot (0.6 m) diameter tree, 9.8 feet (3.0
m) north of the north edge of the road, and 4.7 feet (1.4 m) WNW of a 1-foot
(0.3 m) diameter tree. The bench mark is 0.4 foot (0.1 m) above the ground,
crimped to a stainless steel rod driven 1.5 feet (0.5 m) to refusal, and encased
in a PVC pipe.
BENCH MARK STAMPING: 3506 G 1987
MONUMENTATION: Survey Disk VM#: 5886
AGENCY: PID:
SETTING CLASSIFICATION: Coral Rock Outcrop
The bench mark is set in a coral rock outcrop surrounded by a mound of concrete
at the east end of Pumpkin Key, about 756 (230 m) along the east half of the
golf cart road from the flagpole at the south end of the key, 16.3 feet (5.0 m)
WSW of a coral rock drop-off at the waters edge, 6.7 feet (2.0 m) WSW of an
1.5-foot (0.5 m) diameter twin trunked tree, and 2.5 feet (0.8 m) ENE of the
east edge of the golf cart road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 09/15/1988
Station ID: 8723506 SUPERCEDED DATE: 04/21/2003
Name: PUMPKIN KEY, CARD SOUND
FLORIDA
NOAA Chart: 11463 Latitude: 25° 19.5' N
USGS Quad: CARD SOUND Longitude: 80° 17.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3506 H 1987
MONUMENTATION: Survey Disk VM#: 5887
AGENCY: PID:
SETTING CLASSIFICATION: Coral Rock Outcrop
The bench mark is set in a coral rock outcrop surrounded by a mound of concrete
at the north end of Pumpkin Key, west of the northernmost point of the key,
about 1355 feet (413 m) along the east half of the golf cart road from the
flagpole at the south end of the key, 17.0 feet (5.2 m) NE of a small date palm
tree, 7.8 feet (2.4 m) WSW of a coral rock drop-off at the waters edge, 6.0 feet
(1.8 m) north of a 0.8-foot (0.2 m) diameter tree, and 4.8 feet (1.5 m) ENE of
the east edge of the golf cart road.
BENCH MARK STAMPING: PRM KS 2325
MONUMENTATION: Survey Disk VM#: 5888
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is north of the north end of the easternmost rock jetty at the
south end of Pumpkin Key, 306.7 feet (93.5 m) ESE of the flag pole, 35 feet (11
m) NNE of the north end of the easternmost rock jetty, 7.7 feet (2.3 m) NNW of a
1.5-foot (0.5 m) diameter tree, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 09/15/1988
Station ID: 8723506 SUPERCEDED DATE: 04/21/2003
Name: PUMPKIN KEY, CARD SOUND
FLORIDA
NOAA Chart: 11463 Latitude: 25° 19.5' N
USGS Quad: CARD SOUND Longitude: 80° 17.6' W
T I D A L D A T U M S
Tidal datums at PUMPKIN KEY, CARD SOUND based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: AUGUST - SEPTEMBER 1987
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8723970 VACA KEY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/15/1987) = 2.01
MEAN HIGHER HIGH WATER MHHW = 0.77
MEAN HIGH WATER MHW = 0.74
MEAN TIDE LEVEL MTL = 0.43
MEAN LOW WATER MLW = 0.11
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (08/04/1987) = -0.06
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
3506 D 1987 5.31 4.57
3506 E 1987 6.44 5.70
3506 F 1987 6.68 5.94
3506 G 1987 2.97 2.23
3506 H 1987 3.03 2.29
PRM KS 2325 1.80 1.06
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 09/15/1988
Station ID: 8723506 SUPERCEDED DATE: 04/21/2003
Name: PUMPKIN KEY, CARD SOUND
FLORIDA
NOAA Chart: 11463 Latitude: 25° 19.5' N
USGS Quad: CARD SOUND Longitude: 80° 17.6' W
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 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.