U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8722557 PUBLICATION DATE: 02/13/2004
Name: NORTH PALM BEACH
FLORIDA
NOAA Chart: 11466 Latitude: 26° 49.6' N
USGS Quad: RIVIERA BEACH Longitude: 80° 3.3' W
To reach the tidal bench marks from the intersection of U.S. Highway 1 and Yacht
Club Drive in North Palm Beach, 0.5 km (0.3 mi) south of the U.S. Highway 1
bridge over the Intracoastal Waterway, proceed east on Yacht Club Drive to the
Landings East Condominiums on Lake Worth. The bench marks are located in the
vicinity of the condominiums, along Yacht Club Drive, and along U.S. Highway 1.
The tide gage and staff were located on a dock behind the condominiums.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: N 309 1970
DESIGNATION: N 309
MONUMENTATION: Bench Mark disk VM#: 5592
AGENCY: National Geodetic Survey (NGS) PID#: AD2896
SETTING CLASSIFICATION: Concrete sea wall
The primary bench mark is a disk set flush in a concrete sea wall located at the
Landings East Condominiums, 19.63 m (64.4 ft) south of the south edge of the
center wooden dock of three wooden docks, 10.76 m (35.3 ft) east of the SE
corner of the condominiums building at 52 Yacht Club Drive, and 0.3 m (1 ft)
above the level of the lawn.
BENCH MARK STAMPING: L 309 1970
DESIGNATION: L 309
MONUMENTATION: Bench Mark disk VM#: 5590
AGENCY: National Geodetic Survey (NGS) PID#: AD2899
SETTING CLASSIFICATION: Copper-clad steel rod
The bench mark is a disk located in the SW corner of the lawn for the Landings
East Condominiums at 52 Yacht Club Drive, 17.22 m (56.5 ft) west of the SW
corner of the swimming pool, 12 m (41 ft) south of the centerline of the
driveway to a parking lot, 11 m (36 ft) east of Yacht Club Drive, 1.49 m (4.9
ft) east of the east of the hedges, and 0.24 m (0.8 ft) north of a metal
witneess post, 0.24 m (0.8 ft) north of a row of hedge fence. The bench mark is
set 6 cm (0.2 ft) above ground level, crimped to the top of a copper-clad steel
rod driven 9.8 m (32 ft), and encased in a 4-inch metal pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8722557 PUBLICATION DATE: 02/13/2004
Name: NORTH PALM BEACH
FLORIDA
NOAA Chart: 11466 Latitude: 26° 49.6' N
USGS Quad: RIVIERA BEACH Longitude: 80° 3.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: M 309 1970
DESIGNATION: M 309
MONUMENTATION: Bench Mark disk VM#: 5591
AGENCY: National Geodetic Survey (NGS) PID#: AD2900
SETTING CLASSIFICATION: Concrete wall
The bench mark is a disk set flush in the top of the SW corner of a concrete
wall surrounding the steps leading to an underground pumphouse for the pool,
17.22 m (56.5 ft) NE of bench mark L 309 1970, and 5 m (16 ft) NW of the NW
corner of the swimming pool.
BENCH MARK STAMPING: P 309 1970
DESIGNATION: P 309
MONUMENTATION: Bench Mark disk VM#: 5593
AGENCY: National Geodetic Survey (NGS) PID#: AD2901
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top of a concrete sea wall located near the
NE corner of the lawn for the Landing East Condominiums, and 22 m (73 ft) NE of
the NE corner of Landings East Condominiums.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8722557 PUBLICATION DATE: 02/13/2004
Name: NORTH PALM BEACH
FLORIDA
NOAA Chart: 11466 Latitude: 26° 49.6' N
USGS Quad: RIVIERA BEACH Longitude: 80° 3.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Q 309 1970
DESIGNATION: Q 309
MONUMENTATION: Bench Mark disk VM#: 5594
AGENCY: National Geodetic Survey (NGS) PID#: AD2895
SETTING CLASSIFICATION: Concrete catch basin
The bench mark is a disk set in the NE corner of a 1 m (3 ft) square and 1 m (3
ft) deep concrete catch basin located 26 m (84 ft) SE of the SE corner of a
large yacht basin, 10 m (33 ft) east of the centerline of a driveway which leads
north between the yacht basin and the Bimini Key Condominiums, 6 m (20 ft) north
of the centerline of Yacht Club Drive, 1.74 m (5.7 ft) south of the south edge
of a sidewalk, and 0.15 m (0.5 ft) below road level.
BENCH MARK STAMPING: 29.591
DESIGNATION: 29.591 FLHD
MONUMENTATION: Survey disk VM#: 5595
AGENCY: Florida Department of Transportation (FLDOT)PID#: AD2897
SETTING CLASSIFICATION: Concrete bridge abutment
The bench mark is a disk set on the top of the east end of the south concrete
abutment for the U.S. Highway 1 bridge over the Intercoastal Waterway, 5 m (18
ft) east of the centerline of the northbound highway lane, and 0.30 m (1 ft)
above highway level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8722557 PUBLICATION DATE: 02/13/2004
Name: NORTH PALM BEACH
FLORIDA
NOAA Chart: 11466 Latitude: 26° 49.6' N
USGS Quad: RIVIERA BEACH Longitude: 80° 3.3' W
T I D A L D A T U M S
Tidal datums at NORTH PALM BEACH based on:
LENGTH OF SERIES: 3 YEARS
TIME PERIOD: September 1970 - August 1973
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8723170 MIAMI BEACH (CITY PIER)
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/25/1973) = 1.510
MEAN HIGHER HIGH WATER (MHHW) = 0.972
MEAN HIGH WATER (MHW) = 0.912
NORTH AMERICAN VERTICAL DATUM-1988 (NAVD) = 0.804
MEAN SEA LEVEL (MSL) = 0.490
MEAN TIDE LEVEL (MTL) = 0.484
MEAN LOW WATER (MLW) = 0.056
MEAN LOWER LOW WATER (MLLW) = 0.000
LOWEST OBSERVED WATER LEVEL (05/22/1971) = -0.456
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
N 309 1970 2.022 1.110
L 309 1970 2.345 1.433
M 309 1970 2.629 1.717
P 309 1970 2.028 1.116
Q 309 1970 1.972 1.060
29.591 9.361 8.449
Foot Notes:
Bench mark 29.591 is based on one differential leveling connection and does not
meet the quality control standards of the NOS. Therefore, caution should be used
when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8722557 PUBLICATION DATE: 02/13/2004
Name: NORTH PALM BEACH
FLORIDA
NOAA Chart: 11466 Latitude: 26° 49.6' N
USGS Quad: RIVIERA BEACH Longitude: 80° 3.3' 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.