U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 01/25/1988
Station ID: 8721138 SUPERCEDED DATE: 04/21/2003
Name: PONCE INLET, HALIFAX RIVER
FLORIDA
NOAA Chart: 11484 Latitude: 29° 4.9' N
USGS Quad: NEW SMYRNA BEACH Longitude: 80° 56.2' W
To reach the tidal bench marks from Ponce de Leon Inlet proceed north to Beach
Street, then west on Beach Street to Timmons Camp on the Halifax River. The
bench marks are along Beach Street, Peninsula Drive and in the vicinity of
Timmons Camp. The tide gage and staff were located on the NW end of the pier at
Timmons Camp.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5 1974
MONUMENTATION: Survey Disk VM#: 5295
AGENCY: PID#: AQ1525
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set flush in the top of a 0.8 foot (0.2 m) square concrete
monument at the SW corner of the intersection of Beach Street and Sailfish
Drive, about 40 feet (12 m) west of a fire hydrant across Sailfish Drive, about
18 feet (5 m)SSE of the centerline of Beach Street, about 4 feet (1 m) SE of a
power line pole, and about 0.5 foot (0.2 m) below the pavement.
BENCH MARK STAMPING: S 318 1970
MONUMENTATION: Survey Disk VM#: 5291
AGENCY: PID#: AQ1393
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument about 0.3 mile (0.5 km)
east of Ponce de Leon Inlet Lighthouse, on the south end of the peninsula formed
by the Halifax River and the Atlantic Ocean, 20 feet (6 m) south of the
approximate centerline of Peninsula Drive, 2 feet (1 m) east of a metal witness
post, 1.5 feet (0.5 m) NW of a power pole, and 0.2 foot (0.1 m) above the
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 01/25/1988
Station ID: 8721138 SUPERCEDED DATE: 04/21/2003
Name: PONCE INLET, HALIFAX RIVER
FLORIDA
NOAA Chart: 11484 Latitude: 29° 4.9' N
USGS Quad: NEW SMYRNA BEACH Longitude: 80° 56.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: T 318 1970
MONUMENTATION: Survey Disk VM#: 5292
AGENCY: PID#: AQ1391
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument 282 feet (86 m) west of
the junction of Beach Street and South Atlantic Avenue, 16 feet (5 m) south of
the approximate centerline of Beach Street, 2 feet (1 m) east of the first power
line pole west of the junction, 1.5 feet (0.5 m) west of a metal witness post,
and 0.2 foot (0.1 m) above the ground.
BENCH MARK STAMPING: N 320 1970
MONUMENTATION: Survey Disk VM#: 5293
AGENCY: PID#: AQ1392
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument about 250 feet (76 m) SE
of the SE side of Ponce de Leon Inlet Lighthouse, 191 feet (58 m) north of the
centerline of South Peninsula Drive, 3 feet (1 m) west of the center of a steel
gate in the fence line, 1.4 feet (0.4 m) east of a metal witness post, 1 foot
(0.3 m) south of the south side of a hurricane fence line, and 0.2 foot (0.1 m)
above the ground.
BENCH MARK STAMPING: 1 1974
MONUMENTATION: Survey Disk VM#: 5294
AGENCY: PID#: AQ1528
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set flush in the top of a concrete seawall on the SE corner of
the pier at Timmons Camp, 20 feet (6 m) south of the concrete sea wall on the
south side of the boat slip, 1.5 feet (0.5 m) south of the concrete ramp leading
to the pier, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 01/25/1988
Station ID: 8721138 SUPERCEDED DATE: 04/21/2003
Name: PONCE INLET, HALIFAX RIVER
FLORIDA
NOAA Chart: 11484 Latitude: 29° 4.9' N
USGS Quad: NEW SMYRNA BEACH Longitude: 80° 56.2' W
T I D A L D A T U M S
Tidal datums at PONCE INLET, HALIFAX RIVER based on:
LENGTH OF SERIES: 10 MONTHS
TIME PERIOD: FEBRUARY-NOVEMBER 1974
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8721120 DAYTONA BEACH SHORES
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/06/1974) = 5.60
MEAN HIGHER HIGH WATER MHHW = 3.22
MEAN HIGH WATER MHW = 3.00
MEAN TIDE LEVEL MTL = 1.61
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 1.45
MEAN LOW WATER MLW = 0.23
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/26/1975) = -1.24
* NGVD reference based on adjustment of 1976 and NOS levels of 1982.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
5 1974 6.26 3.26
S 318 1970 7.57 4.57
T 318 1970 14.66 11.66
N 320 1970 12.76 9.76
1 1974 6.35 3.35
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 01/25/1988
Station ID: 8721138 SUPERCEDED DATE: 04/21/2003
Name: PONCE INLET, HALIFAX RIVER
FLORIDA
NOAA Chart: 11484 Latitude: 29° 4.9' N
USGS Quad: NEW SMYRNA BEACH Longitude: 80° 56.2' 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.