U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 12/10/1986
Station ID: 8722414 SUPERCEDED DATE: 04/21/2003
Name: GOMEZ, SOUTH JUPITER NARROWS
FLORIDA
NOAA Chart: 11474 Latitude: 27° 5.7' N
USGS Quad: GOMEZ Longitude: 80° 8.2' W
To reach the tidal bench marks from the intersection of State Highway A1A and
State Road 707 in Hobe Sound, proceed 0.1 mile (0.2 km) easterly on State Road
707 to Gomez Avenue, then 2.35 miles (3.78 km) northerly on Gomez Avenue to
Coconut Street, then 0.3 mile (0.5 km) easterly on Coconut Street to its end.
The bench marks are located on the concrete seawall. The tide gage and staff
were located east of the bench marks on daybeacon 24 on the Intracoastal
Waterway.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1972
MONUMENTATION: Survey Disk VM#: 5471
AGENCY: PID#: AF6971
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set flush on the concrete seawall, 135.1 feet (41.2 m) NE of
Bench Mark NO 2 1972, 65 feet (20 m) north of the north tangent point of the SE
corner of the seawall, 4 feet (1 m) south of the property line, and 0.6 foot
(0.2 m) from the seaward edge of the seawall.
BENCH MARK STAMPING: NO 2 1972
MONUMENTATION: Survey Disk VM#: 5472
AGENCY: PID#: AF6972
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set flush in the concrete seawall at 8598 Coconut Street,
135.1 feet (41.2 m) SW of Bench Mark NO 1 1972, 88 feet (27 m) south of the SW
corner of the house at 8598 Coconut Street, 81.0 feet (24.7 m) east of Bench
Mark NO 3 1972, 56.3 feet (17.2 m) west of the west tangent point of the SE
corner of the seawall, and 0.6 foot (0.2 m) north of the south edge of the
seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 12/10/1986
Station ID: 8722414 SUPERCEDED DATE: 04/21/2003
Name: GOMEZ, SOUTH JUPITER NARROWS
FLORIDA
NOAA Chart: 11474 Latitude: 27° 5.7' N
USGS Quad: GOMEZ Longitude: 80° 8.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1972
MONUMENTATION: Survey Disk VM#: 5473
AGENCY: PID#: AF6973
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set flush in the concrete seawall at 8578 Coconut Street,
137.3 feet (41.8 m) west of the west tangent point of the SE corner of the
seawall, 81.0 feet (24.7 m) west of Bench Mark NO 2 1972, and 40.0 feet (12.2 m)
SSE of the SW corner of the screened in porch and pool at 8578 Coconut Street.
BENCH MARK STAMPING: NO 4 1972
MONUMENTATION: Survey Disk VM#: 5474
AGENCY: PID#: AF6974
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set flush in the concrete seawall at 8597 Coconut Street, 98.2
feet (29.9 m) south of Bench Mark NO 5 1972, 72.0 feet (21.9 m) NE of the north
corner of the house at 8598 Coconut Street, and 56.7 feet (17.3 m) north of
Bench Mark NO 1 1972.
BENCH MARK STAMPING: NO 5 1972
MONUMENTATION: Survey Disk VM#: 5475
AGENCY: PID#: AF6975
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set flush in the concrete seawall at 8597 Coconut Street, 98.2
feet (29.9 m) north of Bench Mark NO 4 1972, 78.0 feet (23.8 m) south of the
north tangent point of the NE corner of the seawall at 8597 Coconut Street, and
49.8 feet (15.2 m) east of the SE corner of the house at 8597 Coconut Street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 12/10/1986
Station ID: 8722414 SUPERCEDED DATE: 04/21/2003
Name: GOMEZ, SOUTH JUPITER NARROWS
FLORIDA
NOAA Chart: 11474 Latitude: 27° 5.7' N
USGS Quad: GOMEZ Longitude: 80° 8.2' W
T I D A L D A T U M S
Tidal datums at GOMEZ, SOUTH JUPITER NARROWS based on:
LENGTH OF SERIES: 1 MONTHS
TIME PERIOD: April 1973
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8722429 Hobe Sound
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (03/25/1973) = 2.05
MEAN HIGHER HIGH WATER MHHW = 1.60
MEAN HIGH WATER MHW = 1.47
MEAN TIDE LEVEL MTL = 0.81
MEAN LOW WATER MLW = 0.15
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (05/03/1973) = -0.58
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 1 1972 4.03 2.56
NO 2 1972 4.07 2.60
NO 3 1972 4.11 2.64
NO 4 1972 4.16 2.69
NO 5 1972 4.16 2.69
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 12/10/1986
Station ID: 8722414 SUPERCEDED DATE: 04/21/2003
Name: GOMEZ, SOUTH JUPITER NARROWS
FLORIDA
NOAA Chart: 11474 Latitude: 27° 5.7' N
USGS Quad: GOMEZ Longitude: 80° 8.2' 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.