U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8722746 PUBLICATION DATE: 12/08/2010
Name: DELRAY BEACH
FL
NOAA Chart: 11466 Latitude: 26° 28.4' N ( 26.47330)
USGS Quad: DELRAY BEACH Longitude: 80° 3.7' W ( -80.06170)
To reach the tidal bench marks from the junction of State Highway 806A (NE 8th
Street) and U.S. Highway 1, proceed east on State Highway 806A for 0.64 km (0.4
mi) to the bridge over the Intracoastal Waterway. The bench marks are on the
bridge. The tide station was on the SE fender of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1973
DESIGNATION: 872 2746 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 5626
AGENCY: National Ocean Survey (NOS) IDB PID#: AD5816
SETTING CLASSIFICATION: Concrete Bridge Abutment OPUS PID:
LATITUDE: 26° 28.4' N ( 26.47330) LONGITUDE: 80° 3.8' W ( -80.06333)
The primary bench mark is a disk set flush in the concrete sidewalk at the NW
corner of the bridge, 4.60 m (15.1 ft) north of the centerline of the highway,
1.00 m (3.3 ft) south of the north end of the west concrete abutment of the
street bridge spanning the Intracoastal Waterway, and 0.30 m (1.0 ft) above the
street.
BENCH MARK STAMPING: BM IWP 116 D 8 1951 1961
DESIGNATION: 116 IWP D 8 USE
MONUMENTATION: Tidal Station disk VM#: 5625
AGENCY: US Army Corps Of Engineers (USE) IDB PID#: AD2694
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 26° 28.4' N ( 26.47330) LONGITUDE: 80° 3.8' W ( -80.06333)
The bench mark is a disk set flush in the south concrete sidewalk of the bridge
spanning the Intracoastal Waterway, 26.30 m (86.3 ft) east of the west end of
the sidewalk, 4.88 m (16.0 ft) south of the centerline of the highway, 0.30 m
(1.0 ft) NE of the NE corner of the drawspan of the bridge and the bridge
operator building, and 0.30 m (1.0 ft) above the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8722746 PUBLICATION DATE: 12/08/2010
Name: DELRAY BEACH
FL
NOAA Chart: 11466 Latitude: 26° 28.4' N ( 26.47330)
USGS Quad: DELRAY BEACH Longitude: 80° 3.7' W ( -80.06170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: RM 1 IWP 116
DESIGNATION: 116 IWP RM 1 FLHD
MONUMENTATION: Tidal Station disk VM#: 5627
AGENCY: Florida Department of Transportation
(FLSRD) IDB PID#: AD2693
SETTING CLASSIFICATION: Concrete Bridge OPUS PID:
LATITUDE: 26° 28.4' N ( 26.47333) LONGITUDE: 80° 3.8' W ( -80.06333)
The bench mark is a disk set flush in the top of the wing wall at the SW end of
the bridge over the Intracoastal Waterway, 5.70 m (18.7 ft) south of the
centerline of the highway and 0.30 m (1.0 ft) above the level of the highway.
BENCH MARK STAMPING: 93 71 A09
DESIGNATION: 9371 A 09 FLDT
MONUMENTATION: Tidal Station disk VM#: 5628
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AD5817
SETTING CLASSIFICATION: Concrete Bridge sidewalk OPUS PID:
LATITUDE: 26° 28.4' N ( 26.47330) LONGITUDE: 80° 3.8' W ( -80.06333)
The bench mark is a disk set flush in the concrete sidewalk along the south side
of the bridge, 21.34 m (70.0 ft) east of the west end of the bridge, 4.57 m
(15.0 ft) south of the centerline of the highway, and 1.83 m (6.0 ft) NW of the
NW corner of the bridge operator building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8722746 PUBLICATION DATE: 12/08/2010
Name: DELRAY BEACH
FL
NOAA Chart: 11466 Latitude: 26° 28.4' N ( 26.47330)
USGS Quad: DELRAY BEACH Longitude: 80° 3.7' W ( -80.06170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2746 F
DESIGNATION: 872 2746 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 5629
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AD5818
SETTING CLASSIFICATION: Concrete abutment wing wall OPUS PID:
LATITUDE: 26° 28.4' N ( 26.47330) LONGITUDE: 80° 3.7' W ( -80.06170)
The bench mark is a disk set flush in the top of the concrete wing wall at the
NE corner of the bridge spanning the Intracoastal Waterway, 5.79 m (19.0 ft)
north of the centerline of the highway, 0.09 m (0.3 ft) south of the north end
of the east concrete abutment for the street bridge spanning the Intracoastal
Waterway, and 0.30 m (1.0 ft) above the street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8722746 PUBLICATION DATE: 12/08/2010
Name: DELRAY BEACH
FL
NOAA Chart: 11466 Latitude: 26° 28.4' N ( 26.47330)
USGS Quad: DELRAY BEACH Longitude: 80° 3.7' W ( -80.06170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Q 315 1970
DESIGNATION: Q 315
MONUMENTATION: Bench Mark disk VM#: 18778
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AD2706
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 26° 29.5' N ( 26.49167) LONGITUDE: 80° 3.3' W ( -80.05500)
The bench mark is a disk set in the top of a concrete post projecting 1.0 inch
above the level of the ground, located 15.54 m (51.0 ft) south of the
approximate center line of Golfview Drive, 7.92 m (26.0 ft) west of the center
line of State Highway A1A, 0.61 m (2.0 ft) north of a power line pole, 0.30 m
(1.0 ft) east of a metal witness post, and about level with the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8722746 PUBLICATION DATE: 12/08/2010
Name: DELRAY BEACH
FL
NOAA Chart: 11466 Latitude: 26° 28.4' N ( 26.47330)
USGS Quad: DELRAY BEACH Longitude: 80° 3.7' W ( -80.06170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: P 315 1970
DESIGNATION: P 315
MONUMENTATION: Bench Mark disk VM#: 18779
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AD2703
SETTING CLASSIFICATION: Concrete Post OPUS PID:
LATITUDE: 26° 28.5' N ( 26.47500) LONGITUDE: 80° 3.4' W ( -80.05667)
The bench mark is a disk set flush with the ground surface 49.19 m (161.4 ft)
north of the centerline of NE 8th Street (George Bush Blvd.), 49.01 m (160.8 ft)
south of the centerline of Pelican Lane, 6.40 m (21.0 ft) west of and level with
the highway centerline, 0.49 m (1.6 ft) NE of a witness post, 0.30 m (1.0 ft)
east of utility pole Number 68105688901.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8722746 PUBLICATION DATE: 12/08/2010
Name: DELRAY BEACH
FL
NOAA Chart: 11466 Latitude: 26° 28.4' N ( 26.47330)
USGS Quad: DELRAY BEACH Longitude: 80° 3.7' W ( -80.06170)
T I D A L D A T U M S
Tidal datums at DELRAY BEACH based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: April 1973 - May 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:
MEAN HIGHER HIGH WATER MHHW = 0.845
MEAN HIGH WATER MHW = 0.799
North American Vertical Datum NAVD88 = 0.702
MEAN TIDE LEVEL MTL = 0.421
MEAN SEA LEVEL MSL = 0.404
MEAN LOW WATER MLW = 0.042
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1973 4.482 3.683
BM IWP 116 D 8 1951 1961 4.887 4.088
RM 1 IWP 116 4.582 3.783
93 71 A09 4.786 3.987
2746 F 4.568 3.769
Q 315 1970 4.973 4.174
P 315 1970 6.813 6.014
Foot Notes:
Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control
standards for Second Order, Class 1 leveling. It is advised that a confirmation
set of levels be established for bench marks P 315 1970 and Q 315 1970 to verify
height differences before using tidal bench mark elevation information.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8722746 PUBLICATION DATE: 12/08/2010
Name: DELRAY BEACH
FL
NOAA Chart: 11466 Latitude: 26° 28.4' N ( 26.47330)
USGS Quad: DELRAY BEACH Longitude: 80° 3.7' W ( -80.06170)
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 NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
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.