U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 07/27/1987
Station ID: 8722816 SUPERCEDED DATE: 04/21/2003
Name: BOCA RATON, LAKE BOCA RATON
FLORIDA
NOAA Chart: 11466 Latitude: 26° 20.6' N
USGS Quad: BOCA RATON Longitude: 80° 4.6' W
To reach the tidal bench marks from the intersection of U.S. Highway 1 and
Palmetto Park Road in Boca Raton, proceed east on Palmetto Park Road for 0.55
mile (0.89 km) to SE 5th Avenue, then south on 5th Avenue for 0.55 mile (0.89
km) to the Boca Raton Hotel and Marina. The bench marks are located along the
approaches to the hotel and on a seawall. The tide gage and staff were located
in the vicinity of the dock master office.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: E 312 1970
MONUMENTATION: Survey Disk VM#: 5645
AGENCY: PID#: AD2618
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set in the top of a concrete seawall, 84 feet (26 m) NE of the
NE corner of the dock master office, 26.5 feet (8.1 m) north of the north end of
dock #20, 1 foot (0.3 m) west of the east edge of the seawall, and 1 foot (0.3
m) above ground level.
BENCH MARK STAMPING: F 312 1970
MONUMENTATION: Survey Disk VM#: 5646
AGENCY: PID#: AD2616
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set in the top of a concrete seawall, 124 feet (38 m) SE of
the SE corner of the dock master office, 22.9 feet (7.0 m) north of dock #12,
16.3 feet (5.0 m) south of dock #13, 1 foot (0.3 m) west of the east edge of the
seawall, and 1 foot (0.3 m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 07/27/1987
Station ID: 8722816 SUPERCEDED DATE: 04/21/2003
Name: BOCA RATON, LAKE BOCA RATON
FLORIDA
NOAA Chart: 11466 Latitude: 26° 20.6' N
USGS Quad: BOCA RATON Longitude: 80° 4.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: G 312 1970
MONUMENTATION: Survey Disk VM#: 5647
AGENCY: PID#: AD2617
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set in the top of a concrete seawall, 41.5 feet (12.6 m) south
of dock #1, 6 feet (2 m) east of the bottom step leading into the hotel on the
east side of the building, 1 foot (0.3 m) north of the north wall of the east
wing of the hotel building, and about level with the ground.
BENCH MARK STAMPING: H 312 1970
MONUMENTATION: Survey Disk VM#: 5648
AGENCY: PID#: AD2619
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument, 86 feet (26 m) west of
the centerline of a driveway leading to the marina, 33 feet (10 m) south of the
centerline of SE 5th Avenue, 30.4 feet (9.3 m) east of the NE corner of a fence,
2 feet (1 m) north of a hedge row, and about level with the ground.
BENCH MARK STAMPING: J 312 1970
MONUMENTATION: Survey Disk VM#: 5649
AGENCY: PID#: AD2620
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument along SE 5th Avenue,
24.5 feet (7.5 m) east of the centerline of SE 5th Avenue, 2.5 feet (0.8 m)
south of a concrete utility pole, 2.5 feet (0.8 m) SE of a metal witness post,
and about level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 07/27/1987
Station ID: 8722816 SUPERCEDED DATE: 04/21/2003
Name: BOCA RATON, LAKE BOCA RATON
FLORIDA
NOAA Chart: 11466 Latitude: 26° 20.6' N
USGS Quad: BOCA RATON Longitude: 80° 4.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2816 F 1981
MONUMENTATION: Survey Disk VM#: 7468
AGENCY: PID#: AD5834
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the east corner of a foundation for a storm drain
along SE 5th Avenue, 55.7 feet (17.0 m) SW of concrete utility pole #33, 27.3
feet (8.3 m) ESE of the SE corner of a pink concrete wall, 21.7 feet (6.6 m)
WSW of SE 5th Avenue, and about level with the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 07/27/1987
Station ID: 8722816 SUPERCEDED DATE: 04/21/2003
Name: BOCA RATON, LAKE BOCA RATON
FLORIDA
NOAA Chart: 11466 Latitude: 26° 20.6' N
USGS Quad: BOCA RATON Longitude: 80° 4.6' W
T I D A L D A T U M S
Tidal datums at BOCA RATON, LAKE BOCA RATON based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: MAY 1970-APRIL 1971
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 (10/25/1973) = 4.43
MEAN HIGHER HIGH WATER MHHW = 2.52
MEAN HIGH WATER MHW = 2.39
MEAN TIDE LEVEL MTL = 1.27
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.80
MEAN LOW WATER MLW = 0.16
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (04/24/1970) = -0.81
* NGVD is based on elevations published in Quad 260802, March 1972, and NOS
leveling of 1981.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
E 312 1970 6.17 3.78
F 312 1970 5.95 3.56
G 312 1970 6.21 3.82
H 312 1970 7.51 5.12
J 312 1970 6.22 3.83
2816 F 1981 5.37 2.98
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 07/27/1987
Station ID: 8722816 SUPERCEDED DATE: 04/21/2003
Name: BOCA RATON, LAKE BOCA RATON
FLORIDA
NOAA Chart: 11466 Latitude: 26° 20.6' N
USGS Quad: BOCA RATON Longitude: 80° 4.6' 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.