U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8720145 PUBLICATION DATE: 08/12/2011
Name: EDWARDS CREEK
FL
NOAA Chart: 11488 Latitude: 30° 30.1' N ( 30.50170)
USGS Quad: HEDGES Longitude: 81° 32.5' W ( -81.54170)
To reach the tidal bench marks from the intersection of U.S. Highway 17 (Main
Street) and New Berlin Road in Jacksonville, proceed east on New Berlin Road for
8.0 km (5.0 mi) to the y-junction of Cedar Point Road, then east on Cedar Point
Road for 3.3 km (2.1 mi) to Boney Road, then north on Boney Road for 5.8 km (3.6
mi) to Starrett Road, then west on Starrett Road for 91.0 m (300.0 ft) to a dirt
drive, then north on the dirt drive to the first dirt drive leading NE, then NE
on this dirt drive to its end and a private residence (Voglesong). The bench
marks are located along the dirt drives and Boney Road. The tide gage and staff
were located on the covered pier on Edwards Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0145 A 1978
DESIGNATION: 872 0145 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 5044
AGENCY: National Ocean Survey (NOS) IDB PID#: BC1499
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 30.2' N ( 30.50333) LONGITUDE: 81° 32.5' W ( -81.54170)
The primary bench mark is a disk set in the top of a concrete monument flush
with the ground, 15.4 m (50.5 ft) NW of the NW corner of a concrete retaining
wall on the south side of a concrete boat ramp, 13.7 m (45.0 ft) west of Edwards
Creek, 9.7 m (31.8 ft) NNW of a 10-inch gate post along the SE side of the
property, and 2.4 m (8.0 ft) east of a 15-inch pine tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8720145 PUBLICATION DATE: 08/12/2011
Name: EDWARDS CREEK
FL
NOAA Chart: 11488 Latitude: 30° 30.1' N ( 30.50170)
USGS Quad: HEDGES Longitude: 81° 32.5' W ( -81.54170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0145 C 1978
DESIGNATION: 872 0145 C TIDAL
MONUMENTATION: Survey disk VM#: 5046
AGENCY: National Ocean Survey (NOS) IDB PID#: BC1497
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 30.1' N ( 30.50167) LONGITUDE: 81° 32.6' W ( -81.54361)
The bench mark is a disk located 35.4 m (116.0 ft) SE of the SE corner of a
mobile home, 15.1 m (49.5 ft) NNE of a power pole number 4071, 12.2 m (40.0 ft)
ENE of the approximate centerline of the driveway to the mobile home, 8.3 m
(27.2 ft) SE of the SE corner of a hogwire fence, and 3.7 m (12.0 ft) SSE of the
approximate centerline of the drive. The bench mark is crimped to the top of a
copper clad steel rod and encased in a 4-inch PVC pipe flush with the ground and
about level with the drive.
BENCH MARK STAMPING: 0145 D 1978
DESIGNATION: 872 0145 D TIDAL
MONUMENTATION: Survey disk VM#: 5047
AGENCY: National Ocean Survey (NOS) IDB PID#: BC1496
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 30.1' N ( 30.50111) LONGITUDE: 81° 32.7' W ( -81.54528)
The bench mark is a disk set in the top of a concrete monument flush with the
ground and level with the driveway, 7.9 m (26.0 ft) NNW of the approximate
centerline of the road leading NE, 5.5 m (18.0 ft) east of the center of a
driveway leading north, and 0.3 m (1.0 ft) south of a carsonite witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8720145 PUBLICATION DATE: 08/12/2011
Name: EDWARDS CREEK
FL
NOAA Chart: 11488 Latitude: 30° 30.1' N ( 30.50170)
USGS Quad: HEDGES Longitude: 81° 32.5' W ( -81.54170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0145 F 2004
DESIGNATION: 872 0145 F TIDAL
MONUMENTATION: Survey disk VM#: 18596
AGENCY: National Ocean Survey (NOS) IDB PID#: DI0918
SETTING CLASSIFICATION: Concrete Monument OPUS PID:
LATITUDE: 30° 30.0' N ( 30.50000) LONGITUDE: 81° 32.7' W ( -81.54500)
The bench mark is a disk set in the top of a round concrete monument flush with
the ground and level with Starratt Road, 12.8 m (42.0 ft) east of the
approximate centerline of a driveway leading north (at 4051), 12.6 m (41.5 ft)
north of the centerline of Starratt Road, 7.6 m (25.0 ft) south of the
approximate centerline of the driveway leading NE (at 4061), and 0.8 m (2.5 ft)
south of a cut-off power pole and a carsonite witness post. NOTE: A magnet was
imbedded in the ground on the south side of the monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8720145 PUBLICATION DATE: 08/12/2011
Name: EDWARDS CREEK
FL
NOAA Chart: 11488 Latitude: 30° 30.1' N ( 30.50170)
USGS Quad: HEDGES Longitude: 81° 32.5' W ( -81.54170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: DUV 27 1983 BSM
DESIGNATION: DUV 27
MONUMENTATION: Survey disk VM#: 19257
AGENCY: FL. Dept. of Natural Resources (FLDNR) IDB PID#: DI0920
SETTING CLASSIFICATION: Concrete Headwall OPUS PID:
LATITUDE: 30° 29.8' N ( 30.49667) LONGITUDE: 81° 32.4' W ( -81.54000)
The bench mark is a disk set flush in the top of a concrete headwall, 6.2 m
(20.5 ft) NE of the centerline of Boney Road, 5.6 m (18.5 ft) NNW of the SE end
of a metal guard rail, 1.6 m (5.3 ft) NW of the SE end of the headwall, and 0.2
m (0.8 ft) north of a witness post.
BENCH MARK STAMPING: 0145 G 2004
DESIGNATION: 872 0145 G TIDAL
MONUMENTATION: Survey disk VM#: 19258
AGENCY: FL. Dept. of Environmental Protection
(FLDEP) IDB PID#: DI0919
SETTING CLASSIFICATION: Concrete Monument OPUS PID:
LATITUDE: 30° 30.0' N ( 30.50000) LONGITUDE: 81° 32.7' W ( -81.54500)
The bench mark is a disk set in the top of a round concrete monument recessed
0.1 m (0.2 ft) below the level of the ground and about level with Boney Road,
13.4 m (44.0 ft) NE of the approximate centerline Boney Road, 12.5 m (41.0 ft)
ESE of the SE corner of a drain, 8.3 m (27.3 ft) south of the approximate
centerline of Starratt Road, 7.6 m (25.0 ft) ESE of power pole number 4098, 40T
with 1 light and two guy wires attached, and 0.3 m (1.0 ft) north of a carsonite
witness post. NOTE: A magnet was imbedded in the ground on the south side of
the monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8720145 PUBLICATION DATE: 08/12/2011
Name: EDWARDS CREEK
FL
NOAA Chart: 11488 Latitude: 30° 30.1' N ( 30.50170)
USGS Quad: HEDGES Longitude: 81° 32.5' W ( -81.54170)
T I D A L D A T U M S
Tidal datums at EDWARDS CREEK based on:
LENGTH OF SERIES: 3 YEARS
TIME PERIOD: February 2008 - January 2011
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 (11/15/2009) = 2.012
MEAN HIGHER HIGH WATER MHHW = 1.530
MEAN HIGH WATER MHW = 1.463
North American Vertical Datum NAVD88 = 0.896
MEAN SEA LEVEL MSL = 0.835
MEAN TIDE LEVEL MTL = 0.763
MEAN LOW WATER MLW = 0.063
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (03/08/2008) = -0.780
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0145 A 1978 2.920 1.457
0145 C 1978 6.546 5.083
0145 D 1978 8.299 6.836
0145 F 2004 8.549 7.086
DUV 27 1983 BSM 6.857 5.394
0145 G 2004 7.976 6.513
Foot Notes:
Bench marks 0145 G 2004 and DUV 27 1983 BSM 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 6 of 6
Station ID: 8720145 PUBLICATION DATE: 08/12/2011
Name: EDWARDS CREEK
FL
NOAA Chart: 11488 Latitude: 30° 30.1' N ( 30.50170)
USGS Quad: HEDGES Longitude: 81° 32.5' W ( -81.54170)
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.