U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 10/07/1987
Station ID: 8722832 SUPERCEDED DATE: 04/21/2003
Name: DEERFIELD BEACH, HILLSBORO RIVER
FLORIDA
NOAA Chart: 11466 Latitude: 26° 18.8' N
USGS Quad: BOCA RATON Longitude: 80° 4.9' W
To reach the tidal bench marks from the intersection of U.S. Highway 1 and State
Highway 810 in Deerfield Beach, proceed east on State Highway 810 for 0.25 mile
(0.40 km) to SE 12th Avenue, go south on SE 12th Avenue for 0.15 mile (0.24 km)
to SE 3rd court, go east on SE 3rd court for 0.35 mile (0.56 km) to the entrance
of Cove Marina. The bench marks are located along the sea wall at the Cove
Marina, and on State Highway 810. The tide gage and staff were located at the
NE corner of the marina boat basin.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1973
MONUMENTATION: Survey Disk VM#: 5650
AGENCY: PID#: AD5837
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set flush in a concrete sea wall, and covered by an orange
witness sign screwed into a wooden walkway surrounding the Cove Marina Lounge,
66.7 feet (20.3 m) east of Bench Mark NO 2 1973, and 12.5 feet (3.8 m) west of
the eastern end of the sea wall.
BENCH MARK STAMPING: NO 2 1973
MONUMENTATION: Survey Disk VM#: 5651
AGENCY: PID#: AD5836
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set flush in a concrete sea wall, and covered by an orange
witness sign screwed into the wooden walkway surrounding the Cove Marina Lounge,
72.9 feet (22.2 m) west of the east end of the sea wall, and 53.0 feet (16.2 m)
east of Bench Mark NO 3 1973.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 10/07/1987
Station ID: 8722832 SUPERCEDED DATE: 04/21/2003
Name: DEERFIELD BEACH, HILLSBORO RIVER
FLORIDA
NOAA Chart: 11466 Latitude: 26° 18.8' N
USGS Quad: BOCA RATON Longitude: 80° 4.9' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1973
MONUMENTATION: Survey Disk VM#: 5652
AGENCY: PID#: AD5835
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set flush in a concrete sea wall and covered by a wooden
walkway surrounding the Cove Marina Lounge, 132.2 feet (40.3 m) west of the east
end of the sea wall, and 124.9 feet (38.1 m) east of the west end of the sea
wall.
BENCH MARK STAMPING: NO 4 1973
MONUMENTATION: Survey Disk VM#: 5653
AGENCY: PID#: AD5838
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set flush in a concrete sea wall, 67.9 feet (20.7 m) east of
the west end of the sea wall, and 57.0 feet (17.4 m) west of Bench Mark NO 3
1973.
BENCH MARK STAMPING: NO 5 1973
MONUMENTATION: Survey Disk VM#: 5654
AGENCY: PID#: AJ8801
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set flush in a concrete sea wall, 65.7 feet (20.0 m) west of
Bench Mark NO 4 1973, and 2.2 feet (0.7 m) east of the west end of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 10/07/1987
Station ID: 8722832 SUPERCEDED DATE: 04/21/2003
Name: DEERFIELD BEACH, HILLSBORO RIVER
FLORIDA
NOAA Chart: 11466 Latitude: 26° 18.8' N
USGS Quad: BOCA RATON Longitude: 80° 4.9' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2832 F 1981
MONUMENTATION: Survey Disk VM#: 5655
AGENCY: PID#: AD5839
SETTING CLASSIFICATION: Concrete Storm Drain
The bench mark is set flush in a concrete storm drain located on State Highway
810 in front of First Federal Bank of Delray, 0.1 mile (0.2 km) east of the
intersection of U.S. Highway 1 and State Highway 810, 55.9 feet (17.0 m) east of
the center of a manhole cover in the middle of the sidewalk, 38.5 feet (11.7 m)
WNW of the easternmost flagpole in front of the bank, 22.6 feet (6.9 m) south
of the centerline of the eastbound lane of State Highway 810, 14.9 feet (4.5 m)
NE of the westernmost flagpole in front of the First Federal Bank of Delray and
6 feet (2 m) above the level of the road.
BENCH MARK STAMPING: 26.30
MONUMENTATION: Survey Disk VM#: 5656
AGENCY: PID#: AD2612
SETTING CLASSIFICATION: Bridge Abutment
The bench mark is set flush in the north end of the east abutment of the State
Highway 810 bridge over the Intracoastal Waterway, 16.4 feet (5.0 m) north of
the centerline of State Highway 810, 5.5 feet (1.7 m) south of the north end of
the abutment, and about level with the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 10/07/1987
Station ID: 8722832 SUPERCEDED DATE: 04/21/2003
Name: DEERFIELD BEACH, HILLSBORO RIVER
FLORIDA
NOAA Chart: 11466 Latitude: 26° 18.8' N
USGS Quad: BOCA RATON Longitude: 80° 4.9' W
T I D A L D A T U M S
Tidal datums at DEERFIELD BEACH, HILLSBORO RIVER based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: MAY 1973
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8723170 MIAMI BEACH
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (05/04/1973) = 2.93
MEAN HIGHER HIGH WATER MHHW = 2.64
MEAN HIGH WATER MHW = 2.51
MEAN TIDE LEVEL MTL = 1.33
MEAN LOW WATER MLW = 0.15
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (06/01/1973) = -0.66
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 1 1973 6.03 3.52
NO 2 1973 6.10 3.59
NO 3 1973 6.09 3.58
NO 4 1973 6.08 3.57
NO 5 1973 6.07 3.56
2832 F 1981 9.91 7.40
26.30 27.21 24.70
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 10/07/1987
Station ID: 8722832 SUPERCEDED DATE: 04/21/2003
Name: DEERFIELD BEACH, HILLSBORO RIVER
FLORIDA
NOAA Chart: 11466 Latitude: 26° 18.8' N
USGS Quad: BOCA RATON Longitude: 80° 4.9' 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.