U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8720086 PUBLICATION DATE: 06/12/2009
Name: AMELIA CITY, SOUTH AMELIA RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.2' N ( 30.58670)
USGS Quad: AMELIA CITY Longitude: 81° 27.8' W ( -81.46330)
To reach the bench marks of H 326, Amelia No. 2 1934, 0086 K 1987, and 4 1973
from the junction of State Road A1A, County Road 105, and Gerbing Road in Amelia
City, proceed west on Gerbing Road to its end. The bench marks are located at
the end of Gerbing Road and along State Road A1A. To reach the bench marks of
0086 L, Amelia No. 1 1934 and Amelia No. 3 1934 from the junction of State Road
A1A, County Road 105 A and Gerbing Road go south on A1A for (0.1 mi) to Forrest
Drive, go west on Forrest Drive to Suarez Bluff Road, continue west on a dirt
drive to the residence at 1213 Forrest Drive at the South Amelia River. The
bench marks are located at the end of Forrest Drive. The tide gauge and staff
were located behind the residence at 1213 Forrest Drive.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: AMELIA NO 1 1934
DESIGNATION: 872 0086 TIDAL AMELIA 1
MONUMENTATION: Bench Mark disk VM#: 5004
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AJ4724
SETTING CLASSIFICATION: Metal Pipe in Concrete-filled tile OPUS PID:
LATITUDE: 30° 35.3' N ( 30.58833) LONGITUDE: 81° 27.8' W ( -81.46333)
The primary bench mark is a disk set in the top of a concrete filled clay tile
pipe recessed 0.5 ft (0.15 m) below the level of the ground, in front of the
residence at 1213 Forrest Drive, 150.5 ft (45.9 m) SWS of bench mark Amelia NO 3
1934, 94 ft (28.7 m) SSE of a chain link fence on the NW side of the property,
83.2 ft (25.4 m) south of the NW corner of a two story frame house, 60.5 ft
(18.4 m) NNW of the SE side of the property, 56.2 ft (17.1 m) SSW of the SW
corner of the two story frame house, 51.7 ft (15.8 m) SSW of the SW corner of a
brick pillar at the SW corner of the house porch, 31 ft (9.4 m) south of a
24-inch palm tree and 1 ft west of the remnants of a chain link fence post line.
NOTE: A magnet was buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8720086 PUBLICATION DATE: 06/12/2009
Name: AMELIA CITY, SOUTH AMELIA RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.2' N ( 30.58670)
USGS Quad: AMELIA CITY Longitude: 81° 27.8' W ( -81.46330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: AMELIA NO 2 1934
DESIGNATION: 872 0086 TIDAL AMELIA 2
MONUMENTATION: Bench Mark disk VM#: 5005
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC1342
SETTING CLASSIFICATION: Metal Pipe Concrete-filled tile OPUS PID:
LATITUDE: 30° 35.3' N ( 30.58833) LONGITUDE: 81° 27.9' W ( -81.46500)
The bench mark is a disk set in the top of a concrete filled tile pipe, set
flush to the ground in front of the residence at 1231 Gerbing Road, 19.9 m (65.5
ft) SE of the SW corner of the two story frame house, 4.6 m (15 ft) north of the
centerline of Gerbing Road, 3.7 m (12 ft) south of the south corner of a 4-foot
wide concrete sidewalk to the house, 0.9 m (3 ft) south of a 3-foot high wooden
picket fence, 9 m (29.4 ft) NW of a wood power pole and 5.1 m (17 ft) west of a
large twin trunk oak tree, and at the northern edge of pavement of Gerbing Road.
NOTE: A magnet was buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8720086 PUBLICATION DATE: 06/12/2009
Name: AMELIA CITY, SOUTH AMELIA RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.2' N ( 30.58670)
USGS Quad: AMELIA CITY Longitude: 81° 27.8' W ( -81.46330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: AMELIA NO 3 1934
DESIGNATION: 872 0086 TIDAL AMELIA 3
MONUMENTATION: Bench Mark disk VM#: 5006
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC1343
SETTING CLASSIFICATION: Metal Pipe set in concrete-filled tile OPUS PID:
LATITUDE: 30° 35.3' N ( 30.58833) LONGITUDE: 81° 27.8' W ( -81.46333)
The bench mark is a disk set in the top of a concrete filled clay tile pipe
projecting 0.3 ft above the level of the ground in the backyard of the property
at 1213 Forrest Drive, 150.5 ft ENE of bench mark AMELIA NO 1 1934, 40 m (131
ft) SE of bench mark AMELIA NO 1 1934 from the backyard of the residence at 1213
Forrest Drive, 23.9 m (78.6 ft) east of the SE corner of the two-story frame
house, 30.6 m (100.3 ft) ESE of the NE corner of the 1-story part of the house,
12.2 m (40 ft) NW of a wood picket fence along the SE side of the property, and
0.5 m (1.5 ft) SSW of the NW corner of a frame and metal shed. NOTE: A
magnet was buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8720086 PUBLICATION DATE: 06/12/2009
Name: AMELIA CITY, SOUTH AMELIA RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.2' N ( 30.58670)
USGS Quad: AMELIA CITY Longitude: 81° 27.8' W ( -81.46330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: H 326 1970
DESIGNATION: H 326
MONUMENTATION: Bench Mark disk VM#: 5007
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC0191
SETTING CLASSIFICATION: Concrete monument OPUS PID#: BC0191
LATITUDE: 30° 35.6' N ( 30.59330) LONGITUDE: 81° 27.5' W ( -81.45830)
The bench mark is a disk set in the top of a concrete monument, 0.6 m (2ft)
below ground level and 0.2 m (0.5 ft) SSW of a carsonite witness post. From the
NE corner of the junction of State Road A1A and County Road 105A, and Gerbing
Road in Amelia City proceed 14.9 m (48.9 ft) south of the SW corner of a
one-story restaurant building, 14.4 m (47.3 ft) NNW of the centerline of State
Road A1A, 10.1 m (33.1 ft) east of the centerline of County Road 105A, 1.6 m
(5.2 ft) NNE of a wood power pole, 3.4 m (11.2 ft) WNW of a concrete traffic
signal pole and 1.5 m (5 ft) west of a water valve box. NOTES: There is a
remnant steel post set in concrete about 0.3 m (1 ft) NW of the mark, set at the
same depth. A magnet was buried at the south side of the mark.
BENCH MARK STAMPING: 4 1973
DESIGNATION: 872 0086 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 5008
AGENCY: National Ocean Survey (NOS) IDB PID#: BC1344
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 30° 35.3' N ( 30.58833) LONGITUDE: 81° 27.9' W ( -81.46500)
The bench mark is a disk set flush in 1-ft wide concrete sea wall cap at the NE
corner of an 18.0 ft wide wooden dock on the property of 1225 Gerbing Road, at
the NE corner of the intersection of the sea wall with an 18-foot wide wood boat
dock, 13.2 m (43.5 ft) SW of the SW corner of a porch for a two-story house, and
21.8 m (71.5 ft) NW of a brick wall along the SE side of the property.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8720086 PUBLICATION DATE: 06/12/2009
Name: AMELIA CITY, SOUTH AMELIA RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.2' N ( 30.58670)
USGS Quad: AMELIA CITY Longitude: 81° 27.8' W ( -81.46330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0086 K 1987
DESIGNATION: 872 0086 K TIDAL
MONUMENTATION: Tidal Station disk VM#: 19186
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AJ4723
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 35.3' N ( 30.58833) LONGITUDE: 81° 27.9' W ( -81.46500)
The bench mark is a disk located 9.3 m (30.5 ft) NW of a large twin trunked oak
tree, 9.1 m (30.0 ft) SSW of an oak tree, 6.3 m (20.7 ft) SE of the SE corner of
a 1.2 m (4.0 ft) high block wall, 3.0 m (9.8 ft) NW of a 1.8 m (6.0 ft) high
wooden fence, and 0.5 m (1.8 ft) SW of a concrete curb. The bench mark is
crimped to the top of a rod and driven into the ground, encased in a PVC pipe
inside of a concrete kickblock flush with the ground. NOTE: A magnet was
buried at the south side of the mark.
BENCH MARK STAMPING: 0086 L 1988
DESIGNATION: 872 0086 L TIDAL
MONUMENTATION: Tidal Station disk VM#: 19187
AGENCY: US Army Corps of Engineers (USE) IDB PID#: AJ4725
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 30° 35.3' N ( 30.58833) LONGITUDE: 81° 27.8' W ( -81.46333)
The bench mark is a disk set in the top of a square concrete post flush with the
ground, 7.92 m (26.0 ft) east of the centerline of the remnant pavement of
Suarez Bluff Road, 1.68 m (5.5 ft) SE of a wooden power pole, 0.46 m (1.5 ft) SE
of a carsonite witness post, and 0.15 m (0.5 ft) west of a 0.91 m (3.0 in)
wooden post. NOTE: A magnet was buried at the south side of the mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8720086 PUBLICATION DATE: 06/12/2009
Name: AMELIA CITY, SOUTH AMELIA RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.2' N ( 30.58670)
USGS Quad: AMELIA CITY Longitude: 81° 27.8' W ( -81.46330)
T I D A L D A T U M S
Tidal datums at AMELIA CITY, SOUTH AMELIA RIVER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: January 1978 - December 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8720030 FERNANDINA BEACH, AMELIA RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (11/11/1973) = 2.365
MEAN HIGHER HIGH WATER MHHW = 1.798
MEAN HIGH WATER MHW = 1.693
North American Vertical Datum NAVD88 = 1.003
MEAN SEA LEVEL MSL = 0.881
MEAN TIDE LEVEL MTL = 0.872
MEAN LOW WATER MLW = 0.051
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/11/1973) = -0.986
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
AMELIA NO 1 1934 4.623 2.930
AMELIA NO 2 1934 4.341 2.648
AMELIA NO 3 1934 4.784 3.091
H 326 1970 6.043 4.350
4 1973 3.405 1.712
0086 K 1987 4.248 2.555
0086 L 1988 4.783 3.090
Foot Notes:
Bench marks 0086 K 1987 and 0086 L 1988 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 7 of 7
Station ID: 8720086 PUBLICATION DATE: 06/12/2009
Name: AMELIA CITY, SOUTH AMELIA RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.2' N ( 30.58670)
USGS Quad: AMELIA CITY Longitude: 81° 27.8' W ( -81.46330)
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.