U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8722004 PUBLICATION DATE: 05/16/2012
Name: SEBASTIAN INLET
FL
NOAA Chart: 11476 Latitude: 27° 51.6' N ( 27.86000)
USGS Quad: SEBASTIAN Longitude: 80° 26.9' W ( -80.44830)
To reach the tidal bench marks from the intersection of State Road 516 and State
Highway A1A in Indialantic, proceed 29 km (18 mi) SSE on State Highway A1A to
the bridge over Sebastian Inlet. The bench marks are located on the Sebastian
Inlet bridge and on the pier supports beneath the bridge. The tide gage and
staff were located on the north fender of the State Highway A1A bridge over
Sebastian Inlet.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 2 1969
DESIGNATION: 872 2004 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 5396
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AF3447
SETTING CLASSIFICATION: Piling base OPUS PID:
LATITUDE: 27° 51.6' N ( 27.86083) LONGITUDE: 80° 27.0' W ( -80.44917)
The primary bench mark is a disk set flush in the top of the most eastern piling
base of the sixth row of pilings (starting from the north end) under the bridge,
31.85 m (104.5 ft) NW of bench mark R 219 BREV 73, 3.20 m (10.5 ft) north of the
SE corner of the piling base, 1.40 m (4.6 ft) NE of the NE face of the most
eastern piling, and 0.30 m (1.0 ft) SW of the NE corner of the piling base.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8722004 PUBLICATION DATE: 05/16/2012
Name: SEBASTIAN INLET
FL
NOAA Chart: 11476 Latitude: 27° 51.6' N ( 27.86000)
USGS Quad: SEBASTIAN Longitude: 80° 26.9' W ( -80.44830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: V 304 1970
DESIGNATION: V 304
MONUMENTATION: Tidal Station disk VM#: 5397
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AF3450
SETTING CLASSIFICATION: Concrete guardrail OPUS PID:
LATITUDE: 27° 51.7' N ( 27.86194) LONGITUDE: 80° 27.0' W ( -80.44972)
The bench mark is a disk set flush in the top of the concrete gaurdrail at the
NW corner of the bridge, 0.91 m (3.0 ft) above the level of the bridge floor,
5.03 m (16.5 ft) west of the centerline of State Highway A1A, and 2.32 m (7.6
ft) south of the north end of the concrete guard rail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8722004 PUBLICATION DATE: 05/16/2012
Name: SEBASTIAN INLET
FL
NOAA Chart: 11476 Latitude: 27° 51.6' N ( 27.86000)
USGS Quad: SEBASTIAN Longitude: 80° 26.9' W ( -80.44830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: W 304 1970
DESIGNATION: W 304
MONUMENTATION: Bench Mark disk VM#: 5398
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AF3449
SETTING CLASSIFICATION: Piling base OPUS PID:
LATITUDE: 27° 51.6' N ( 27.86083) LONGITUDE: 80° 27.0' W ( -80.44917)
The bench mark is a disk set in the top of and near the NE corner of the most
eastern piling base of the fifth rows of piling (starting from the north end)
underneath the bridge, 52.43 m (172.0 ft) NW of bench mark R 219 BREV 73, 22.43
m (73.6 ft) north of bench mark NO 2 1969, 3.26 m (10.7 ft) north of the NE
corner of the piling base, 1.71 m (5.6 ft) NE of the NE face of the most eastern
piling, and 0.37 m (1.2 ft) SW of the back edge of a 0.15 m (0.5 ft) concrete
curb.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8722004 PUBLICATION DATE: 05/16/2012
Name: SEBASTIAN INLET
FL
NOAA Chart: 11476 Latitude: 27° 51.6' N ( 27.86000)
USGS Quad: SEBASTIAN Longitude: 80° 26.9' W ( -80.44830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: B 305 1970
DESIGNATION: B 305
MONUMENTATION: Bench Mark disk VM#: 5399
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AF3451
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 27° 51.7' N ( 27.86167) LONGITUDE: 80° 27.0' W ( -80.44944)
The bench mark is a disk set flush in the bridge sidewalk, located 46.82 m
(153.6 ft) south of the north end of the bridge, 4.63 m (15.2 ft) east of the
centerline of State Highway A1A, 0.15 m (0.5 ft) west of the west face of the
East Bannister of the bridge, and 0.24 m (0.8 ft) above the level of the bridge
floor.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8722004 PUBLICATION DATE: 05/16/2012
Name: SEBASTIAN INLET
FL
NOAA Chart: 11476 Latitude: 27° 51.6' N ( 27.86000)
USGS Quad: SEBASTIAN Longitude: 80° 26.9' W ( -80.44830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: R 219 BREV 73
DESIGNATION: R 219
MONUMENTATION: Bench Mark disk VM#: 19465
AGENCY: FL Department of Natural Resources
(FLDNR) IDB PID#: AF6930
SETTING CLASSIFICATION: Seawall OPUS PID#: AF6930
LATITUDE: 27° 51.6' N ( 27.86083) LONGITUDE: 80° 26.9' W ( -80.44861)
The bench mark is a disk set in the top of a seawall underneath a concrete cap
with a 2.13 m (7.0 ft) wide concrete sidewalk with a metal handrail and accessed
through a 6-inch plastic cap set flush with the sidewalk east of the bridge
spanning the Sebastian inlet, 54.25 m (178.0 ft) SE of bench mark W 304 1970,
31.85 m (104.5 ft) SE of bench mark NO 2 1969, 31.21 m (102.4 ft) NE of the SW
end of the seawall, 30.97 m (101.6 ft) NE of the extreme SW edge of the
sidewalk, 0.91 m (3.0 ft) north of the south edge of the sidewalk, and 0.67 m
(2.2 ft) north of the south edge of the seawall.
BENCH MARK STAMPING: 88 78 A 03
DESIGNATION: 88 78 A 03
MONUMENTATION: Bench Mark disk VM#: 19466
AGENCY: FL Department of Transportation (FLDT) IDB PID#: AF6822
SETTING CLASSIFICATION: Concrete monument OPUS PID#: AF6822
LATITUDE: 27° 51.7' N ( 27.86194) LONGITUDE: 80° 27.0' W ( -80.44972)
The bench mark is a disk set in the top of a concrete monument flush with the
ground, 7.04 m (23.1 ft) west of the centerline of State Highway A1A, 6.13 m
(20.1 ft) NW of the north corner of the west concrete guardrail, 1.22 m (4.0 ft)
east of a carsonite witness post, and 0.18 m (0.6 ft) above the level of State
Highway A1A.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8722004 PUBLICATION DATE: 05/16/2012
Name: SEBASTIAN INLET
FL
NOAA Chart: 11476 Latitude: 27° 51.6' N ( 27.86000)
USGS Quad: SEBASTIAN Longitude: 80° 26.9' W ( -80.44830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 88 78 A03 RM NO1
DESIGNATION: 88 78 A 03 RM 1 FLDNR
MONUMENTATION: Bench Mark disk VM#: 19467
AGENCY: FL Department of Transportation (FLDT) IDB PID#: AF6821
SETTING CLASSIFICATION: Curb OPUS PID#: AF6821
LATITUDE: 27° 51.7' N ( 27.86194) LONGITUDE: 80° 27.0' W ( -80.44972)
The bench mark is a disk set flush in the top west concrete curb at the NW end
of the bridge spanning the Sebastian Inlet, 20.39 m (66.9 ft) NNE of bench mark
V 304 1970, 18.14 m (59.5 ft) NNE of the NW end of the concrete bridge
guardrail, 11.92 m (39.1 ft) NNE of a bench mark 88 78 A03, and 6.71 m (22.0 ft)
west of the centerline of State Highway A1A.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8722004 PUBLICATION DATE: 05/16/2012
Name: SEBASTIAN INLET
FL
NOAA Chart: 11476 Latitude: 27° 51.6' N ( 27.86000)
USGS Quad: SEBASTIAN Longitude: 80° 26.9' W ( -80.44830)
T I D A L D A T U M S
Tidal datums at SEBASTIAN INLET based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: August 1969 - July 1970
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 (10/29/1969) = 1.174
MEAN HIGHER HIGH WATER MHHW = 0.741
North American Vertical Datum NAVD88 = 0.741
MEAN HIGH WATER MHW = 0.683
MEAN SEA LEVEL MSL = 0.374
MEAN TIDE LEVEL MTL = 0.362
MEAN LOW WATER MLW = 0.041
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (04/24/1979) = -0.347
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 2 1969 2.003 1.320
V 304 1970 8.177 7.494
W 304 1970 1.994 1.311
B 305 1970 9.649 8.966
R 219 BREV 73 3.009 2.326
88 78 A 03 6.724 6.041
88 78 A03 RM NO1 6.202 5.519
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 88 78 A 03, 88 78 A03 RM NO1, and R
219 BREV 73 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 8 of 8
Station ID: 8722004 PUBLICATION DATE: 05/16/2012
Name: SEBASTIAN INLET
FL
NOAA Chart: 11476 Latitude: 27° 51.6' N ( 27.86000)
USGS Quad: SEBASTIAN Longitude: 80° 26.9' W ( -80.44830)
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.