U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 10/13/1987
Station ID: 8722528 SUPERCEDED DATE: 04/21/2003
Name: DONALD ROSS BRIDGE, INTRACOASTAL WATERWAY
FLORIDA
NOAA Chart: 11466 Latitude: 25° 52.9' N
USGS Quad: JUPITER Longitude: 80° 4.2' W
To reach the tidal bench marks from the intersection of U.S. Highway 1 and
Donald Ross Road in Juno, proceed 0.8 mile (1.3 km) west along Donald Ross Road
to the Intracoastal Waterway. The bench marks are located along the bridge.
The tide gage and staff were located on the north end of the west fender of the
bridge over the Intracoastal Waterway.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 2 1973
MONUMENTATION: Survey Disk VM#: 5577
AGENCY: PID#: AD5804
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set flush in the concrete abutment wingwall on the NW end of
the bridge, 21.0 feet (6.4 m) north of the centerline of the Donald Ross Road,
1.3 feet (0.4 m) south of the north end of the wingwall and 1.2 feet (0.4 m)
north of the north edge of the bridge.
BENCH MARK STAMPING: NO 3 1973
MONUMENTATION: Survey Disk VM#: 5578
AGENCY: PID#: AD5803
SETTING CLASSIFICATION: Concrete Walkway
The bench mark is set flush in the concrete walkway on the north side of the
bridge, 260 feet (79 m) east of the west end of the bridge, 82.5 feet (25.1 m)
west of the east end of the bridge end, 18.6 feet (5.7 m) north of the
centerline of Donald Ross Road, 4.9 feet (2.4 m) east of the SE corner of the
bridge tenders house, and 4 feet (1 m) north of the curb.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 10/13/1987
Station ID: 8722528 SUPERCEDED DATE: 04/21/2003
Name: DONALD ROSS BRIDGE, INTRACOASTAL WATERWAY
FLORIDA
NOAA Chart: 11466 Latitude: 25° 52.9' N
USGS Quad: JUPITER Longitude: 80° 4.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1973
MONUMENTATION: Survey Disk VM#: 5579
AGENCY: PID#: AD5801
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set flush in the concrete abutment wingwall on the SE end of
the bridge, 21.0 feet (6.4 m) south of the centerline of Donald Ross Road, 1.5
feet (0.5 m) south of the south edge of the bridge, and 1.0 foot (0.3 m) north
of the south end of the wingwall.
BENCH MARK STAMPING: DR-6 19.029 MSL
MONUMENTATION: Survey Disk VM#: 5580
AGENCY: PID#: AD5805
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set flush in the concrete abutment wingwall on the SW end of
the bridge, 21.0 feet (6.4 m) south of the centerline of Donald Ross Road, 1.9
feet (0.6 m) south of the south edge of the bridge, and 0.55 foot (0.17 m) north
of the south end of the wingwall.
BENCH MARK STAMPING: DR-7 19.034 MSL
MONUMENTATION: Survey Disk VM#: 5581
AGENCY: PID#: AD5802
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set flush in the concrete abutment wingwall on the NE end of
the bridge, 22 feet (7 m) north of the centerline of Donald Ross Road, 1.8 feet
(0.5 m) north of the north edge of the bridge and 0.6 foot (0.2 m) south of the
north end of the wingwall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 10/13/1987
Station ID: 8722528 SUPERCEDED DATE: 04/21/2003
Name: DONALD ROSS BRIDGE, INTRACOASTAL WATERWAY
FLORIDA
NOAA Chart: 11466 Latitude: 25° 52.9' N
USGS Quad: JUPITER Longitude: 80° 4.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: GOLF 2 S1 5-21-70
MONUMENTATION: Survey Disk VM#: 5582
AGENCY: PID#: AD5800
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set into the top of a concrete monument, 92 feet (28 m) south
of power pole 9, 54 feet (16 m) south of the centerline of Donald Ross Road, 9.8
feet (3.0 m) SE of a power pole, 1.0 foot (0.3 m) north of a witness post, and
0.2 foot (0.1 m) above ground level.
BENCH MARK STAMPING: 20/21/29/28
MONUMENTATION: Survey Disk VM#: 5583
AGENCY: PID#: AD5799
SETTING CLASSIFICATION: Asphalt
The bench mark is at the centerline of Donald Ross Road, 54 feet (16 m) north of
Bench Mark GOLF 2 S1 5-21-70, 47.4 feet (14.4 m) north of a power pole, 38 feet
(12 m) south of power pole 9, and level with the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 10/13/1987
Station ID: 8722528 SUPERCEDED DATE: 04/21/2003
Name: DONALD ROSS BRIDGE, INTRACOASTAL WATERWAY
FLORIDA
NOAA Chart: 11466 Latitude: 25° 52.9' N
USGS Quad: JUPITER Longitude: 80° 4.2' W
T I D A L D A T U M S
Tidal datums at DONALD ROSS BRIDGE, INTRACOASTAL WATERWAY based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: FEBRUARY-MARCH 1973
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8722557 NORTH PALM BEACH
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (02/14/1973) = 3.49
MEAN HIGHER HIGH WATER (MHHW) = 2.64
MEAN HIGH WATER (MHW) = 2.48
MEAN TIDE LEVEL (MTL) = 1.32
MEAN LOW WATER (MLW) = 0.17
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (04/05/1973) = -0.48
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 2 1973 20.00 17.52
NO 3 1973 21.17 18.69
NO 4 1973 20.01 17.53
DR-6 19.029 MSL 19.99 17.51
DR-7 19.034 MSL 20.00 17.52
GOLF 2 S1 5-21-70 14.28 11.80
20/21/29/28 7.74 5.26
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 10/13/1987
Station ID: 8722528 SUPERCEDED DATE: 04/21/2003
Name: DONALD ROSS BRIDGE, INTRACOASTAL WATERWAY
FLORIDA
NOAA Chart: 11466 Latitude: 25° 52.9' N
USGS Quad: JUPITER Longitude: 80° 4.2' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.