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Datums Page Page 1 of 8
Station ID: 8720686 PUBLICATION DATE: 08/29/2017
Name: FORT MATANZAS
FL
NOAA Chart: 11486 Latitude: 29° 42.9' N ( 29.71500)
USGS Quad: MANTANZAS Longitude: 81° 14.3' W ( -81.23830)
To reach the tidal bench marks from Marineland, proceed 5.6 km (3.5 mi) NNW on
State Highway A1A to the Fort Matanzas National Monument entrance at 8635 A1A S,
then west to Fort Matanzas Visitors Center. The bench marks are located within
the park. The tide gauge and staff are located on the Fort Matanzas National
Monument dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1 1974
DESIGNATION: 872 0686 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 5232
AGENCY: National Ocean Survey (NOS) IDB PID#: AQ1557
SETTING CLASSIFICATION: Rock wall OPUS PID:
LATITUDE: 29° 42.9' N ( 29.71472) LONGITUDE: 81° 14.0' W ( -81.23333)
The primary bench mark is a disk set flush in the top of a 0.43 m (1.4 ft) thick
coquina wall at the SE corner of a raised 1.80 m by 4.66 m (5.9 ft by 15.3 ft)
garden box north of the north face of the visitors center building, in the top
center of a 0.76 m (2.5 ft) coquina fence wall at the SE corner of a garden box;
13.72 m (45.0 ft) north of the north face of the Visitors Center building; 4.42
m (14.5 ft) south of the SE corner of the rangers office building; 0.46 m (1.5
ft) below and 0.30 m (1.0 ft) west of the top of a 1.37 m (4.5 ft) high coquina
fence wall, and 0.91 m (3.0 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8720686 PUBLICATION DATE: 08/29/2017
Name: FORT MATANZAS
FL
NOAA Chart: 11486 Latitude: 29° 42.9' N ( 29.71500)
USGS Quad: MANTANZAS Longitude: 81° 14.3' W ( -81.23830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Q 321 1970
DESIGNATION: Q 321
MONUMENTATION: Tidal Station disk VM#: 5231
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AQ0448
SETTING CLASSIFICATION: Concrete monument OPUS PID#: AQ0448
LATITUDE: 29° 43.0' N ( 29.71722) LONGITUDE: 81° 14.0' W ( -81.23389)
The bench mark is a disk set in the top of concrete monument, 0.06 m (0.2 ft)
below the level of the ground, 46.76 m (153.4 ft) north of the centerline of the
entrance road to Fort Matanzas National Monument, 13.17 m (43.2 ft) west of the
centerline of State Road A1A, 12.19 m (40.0 ft) south of the center of a private
drive at 8585 State Road A1A, 10.15 m (33.3 ft) south of the south edge of a
concrete driveway at 8585 State Road A1A, 7.44 m (24.4 ft) north of wood power
pole No. 35411440, 4.1 m (13.4 ft) SE of a 15.24 m by 15.24 m (6 in by 6 in)
concrete right of way marker projecting 0.30 m (1.0 ft) above the ground, 1.83 m
(6.0 ft) north of a 15.24 m by 12.70 m (6 in by 5 in) concrete marker projecting
1.8 m (1.8 ft) above the level of the ground, 1.07 m (3.5 ft) west of the west
edge of a 1.83 m (6.0 ft) concrete sidewalk, 0.61 m (2.0 ft) NE of a metal
witness post, and 0.30 m (1.0 ft) east of a carsonite witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8720686 PUBLICATION DATE: 08/29/2017
Name: FORT MATANZAS
FL
NOAA Chart: 11486 Latitude: 29° 42.9' N ( 29.71500)
USGS Quad: MANTANZAS Longitude: 81° 14.3' W ( -81.23830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2 1974
DESIGNATION: 872 0686 TIDAL 2
MONUMENTATION: Survey disk VM#: 5233
AGENCY: National Ocean Survey (NOS) IDB PID#: AQ1556
SETTING CLASSIFICATION: Rock retaining wall OPUS PID:
LATITUDE: 29° 42.9' N ( 29.71472) LONGITUDE: 81° 14.2' W ( -81.23667)
The bench mark is a disk set flush in the coquina retaining wall, 1.49 m (4.9
ft) above the level of the concrete sidewalk, in a coquina retaining wall near
the tunnel through the Visitors Center building; 22.01 m (72.2 ft) SW of the
centerline of the entrance road, 2.99 m (9.8 ft) SE of the center of the east
side of the tunnel, and 0.21 m (0.7 ft) NE of the northeast face of the visitors
center building.
BENCH MARK STAMPING: 3 1974
DESIGNATION: 872 0686 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 5234
AGENCY: National Ocean Survey (NOS) IDB PID#: AQ1555
SETTING CLASSIFICATION: Rock culvert OPUS PID:
LATITUDE: 29° 42.9' N ( 29.71528) LONGITUDE: 81° 14.0' W ( -81.23389)
The bench mark is a disk set flush in the top center on the west side of the
culvert and 0.49 m (1.6 ft) below the level of the park entrance road, in the
top center at the west end of an 2.44 m (8.0 ft) long coquina culvert located
near the center of the north side of the park area circled by the drive; 83.21 m
(273.0 ft) east of the Visitors Center building; 42.45 m (139.3 ft) north of the
NE corner of the park restrooms building; south of the centerline of the park
entrance road and 0.30 m (1.0 ft) east of the west end of the culvert.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8720686 PUBLICATION DATE: 08/29/2017
Name: FORT MATANZAS
FL
NOAA Chart: 11486 Latitude: 29° 42.9' N ( 29.71500)
USGS Quad: MANTANZAS Longitude: 81° 14.3' W ( -81.23830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0686 A 2005
DESIGNATION: 872 0686 A TIDAL
MONUMENTATION: Flange-encased Rod VM#: 19381
AGENCY: FL Department of Environmental
Protection (FLDEP) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 43.3' N ( 29.72167) LONGITUDE: 81° 14.0' W ( -81.23333)
The bench mark is a flange-encased rod located 36.45 m (119.6 ft) south of the
approximate centerline of the entrance road to the Fort Matanzas National
Monument, 28.65 m (94.0 ft) NE of a fire hydrant, 13.11 m (43.0 ft) west of the
approximate centerline of State Highway A1A, 9.75 m (32.0 ft) NE of a concrete
right of way marker, 1.62 m (5.3 ft) west of a 1.83 m (6.0 ft) concrete sidewalk
and 0.91 m (3.0 ft) north of a wooden power pole with stamping KOP GA SPSKS 4-04
3-45 FPL. The datum point is recessed 0.09 m (0.3 ft) below the level of the
NGS logo cap, being the top of a stainless steel rod, driven to refusal at a
depth of 12.07 m (39.6 ft) encased in a 5-inch NGS logo cap flush with the
ground. A carsonite witness post has been driven on the east side of the power
pole projecting 0.30 m (1.0 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8720686 PUBLICATION DATE: 08/29/2017
Name: FORT MATANZAS
FL
NOAA Chart: 11486 Latitude: 29° 42.9' N ( 29.71500)
USGS Quad: MANTANZAS Longitude: 81° 14.3' W ( -81.23830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: COVEF 1934 1978
DESIGNATION: COVE RESET
MONUMENTATION: Tidal Station disk VM#: 19382
AGENCY: National Geodetic Survey (NGS) IDB PID#: AQ0452
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 41.9' N ( 29.69861) LONGITUDE: 81° 13.6' W ( -81.22611)
The bench mark is a disk set in the top of a round concrete monument recessed
0.03 m (0.1 ft) below the level of the ground and 2.44 m (8.0 ft) below the
level of State Highway A1A, 27.58 m (90.5 ft) north of the centerline of Gene
Johnson Road, 27.10 m (88.9 ft) south of the center of a driveway, 18.20 m (59.7
ft) east of the centerline of A1A, and 0.40 m (1.3 ft) west of a metal witness
post. NOTES: A magnet was embedded in the ground on the south side of the
monument. Stamping is COVEF 1934 1978.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8720686 PUBLICATION DATE: 08/29/2017
Name: FORT MATANZAS
FL
NOAA Chart: 11486 Latitude: 29° 42.9' N ( 29.71500)
USGS Quad: MANTANZAS Longitude: 81° 14.3' W ( -81.23830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: COVE 1934 1978
DESIGNATION: COVE AZ MK
MONUMENTATION: Tidal Station disk VM#: 19383
AGENCY: National Geodetic Survey (NGS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 29° 42.1' N ( 29.70139) LONGITUDE: 81° 13.6' W ( -81.22722)
The bench mark is a disk set in the top of a round concrete monument recessed
0.09 m (0.3 ft) below the level of the ground and 0.30 m (1.0 ft) below the
level of State Highway A1A, 15.73 m (51.6 ft) west of the centerline of State
Highway A1A, 7.62 m (25.0 ft) south of the approximate centerline of a driveway
at 8911 A1A South, 4.72 m (15.5 ft) NW of a power pole and 0.40 m (1.3 ft) east
of a wire fence and a metal witness post. NOTE: A magnet was embedded in the
ground on the south side of the monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8720686 PUBLICATION DATE: 08/29/2017
Name: FORT MATANZAS
FL
NOAA Chart: 11486 Latitude: 29° 42.9' N ( 29.71500)
USGS Quad: MANTANZAS Longitude: 81° 14.3' W ( -81.23830)
T I D A L D A T U M S
Tidal datums at FORT MATANZAS based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: May 1974 - April 1975
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8720220 MAYPORT (FERRY DEPOT), SAINT JOHNS RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/06/1974) = 2.027
MEAN HIGHER HIGH WATER MHHW = 1.326
MEAN HIGH WATER MHW = 1.231
North American Vertical Datum NAVD88 = 0.807
MEAN SEA LEVEL MSL = 0.667
MEAN TIDE LEVEL MTL = 0.644
MEAN LOW WATER MLW = 0.056
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/26/1975) = -0.530
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1 1974 4.057 2.826
Q 321 1970 4.686 3.455
2 1974 4.740 3.509
3 1974 2.730 1.499
0686 A 2005 4.379 3.148
COVEF 1934 1978 2.394 1.163
COVE 1934 1978 2.461 1.230
Foot Notes:
Bench marks 0686 A 2005, COVEF 1934 1978, and COV 1934 1978 are based on one
differential leveling connection and do not meet the quality control standards
of the NOS. Therefore, caution should be used when deriving elevations for these
marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8720686 PUBLICATION DATE: 08/29/2017
Name: FORT MATANZAS
FL
NOAA Chart: 11486 Latitude: 29° 42.9' N ( 29.71500)
USGS Quad: MANTANZAS Longitude: 81° 14.3' W ( -81.23830)
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.