U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8720004 PUBLICATION DATE: 08/11/2009
Name: CRANDALL, ST. MARYS RIVER
FL
NOAA Chart: 11502 Latitude: 30° 43.3' N ( 30.72170)
USGS Quad: ST. MARYS Longitude: 81° 37.3' W ( -81.62170)
To reach the tidal bench marks from the intersection of U.S. Highway 17 and
State Road A1A in Yulee, proceed 5.95 km (3.7 mi) north on Highway 17 to its
junction with Crandall Road (dirt drive), then 5.95 km (3.7 mi) north on
Crandall Road to the Rayonier SE Timber Division Recreation Area, on the south
bank of St Marys River. The bench marks are located in the recreation area.
The tide gage and staff were on the wooden sea wall of the recreation area.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0004 C 1977
DESIGNATION: 872 0004 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 4970
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC2423
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 43.3' N ( 30.72170) LONGITUDE: 81° 37.4' W ( -81.62330)
The primary bench mark is a disk located 62.9 m (206.3 ft) SSW of an artesian
well, 55.3 m (181.5 ft) south of Tidal bench mark NO 4 1952, 52.9 m (173.5 ft)
SW of the centerline of the south fork of a 2 track dirt drive, 35.4 m (116.0
ft) west of an 8" by 8" wood corner fence post, 32.9 m (108.0 ft) SW of the
center of a 15.2 m (50.0 ft) diameter, 0.6 m (2.0 ft) deep depression in the
ground, 3.1 m (10.0 ft) SE of a 30" oak tree, and 0.3 m (1.0 ft) NE of a
carsonite witness post and 0.2 m (0.5 ft) SSW of a metal post. The bench mark
is set flush with the ground level, crimped to a copper-clad steel rod, driven
12.2 m (40.0 ft) to refusal encased in a PVC pipe and concrete kickblock.
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 6
Station ID: 8720004 PUBLICATION DATE: 08/11/2009
Name: CRANDALL, ST. MARYS RIVER
FL
NOAA Chart: 11502 Latitude: 30° 43.3' N ( 30.72170)
USGS Quad: ST. MARYS Longitude: 81° 37.3' W ( -81.62170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1952
DESIGNATION: 872 0004 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 4968
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC2424
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 43.3' N ( 30.72170) LONGITUDE: 81° 37.4' W ( -81.62330)
The bench mark is a disk set flush in the top of a round concrete monument flush
with the ground located west end of the recreation park, 55.3 m (181.5 ft) NE of
Tidal Benchmark 0004 C 1977, 13.9 m (45.5 ft) south of an artesian well, 8.99 m
29.5 ft SE of a 54-inch oak tree and 0.3 m (1.0 ft) NE of a carsonite witness
post. NOTE A magnet was buried at the south side of the mark.
BENCH MARK STAMPING: 0004 D 1977
DESIGNATION: 872 0004 D TIDAL
MONUMENTATION: Flange-encased Rod VM#: 4971
AGENCY: National Ocean Survey (NOS) IDB PID#: BC2422
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 43.2' N ( 30.72000) LONGITUDE: 81° 37.4' W ( -81.62330)
The bench mark is a flange encased rod located 9.1 m (30.0 ft) NE of a 28-inch
oak tree, 8.3 m (27.2 ft) NW of the centerline of Crandall Road (a 4.9 m (16.0
ft) wide sand road), 2.9 m (9.4 ft) NW of a 19-inch pine tree, 2.3 m (7.7 ft) SE
of a 24-inch sweet gum tree and 0.3 m (1 ft) NW of a carsonite witness post.
The bench mark is crimped to a copper-clad steel rod, driven 14.6 m (47.9 ft) to
refusal, encased in a PVC pipe and concrete kickblock recessed 0.06 m (0.2 ft)
below the level of the ground. 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 6
Station ID: 8720004 PUBLICATION DATE: 08/11/2009
Name: CRANDALL, ST. MARYS RIVER
FL
NOAA Chart: 11502 Latitude: 30° 43.3' N ( 30.72170)
USGS Quad: ST. MARYS Longitude: 81° 37.3' W ( -81.62170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0004 E 2004
DESIGNATION: 0004 E TIDAL
MONUMENTATION: Flange-encased Rod VM#: 19174
AGENCY: National Geodetic Survey (NGS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 43.3' N ( 30.72170) LONGITUDE: 81° 37.4' W ( -81.62330)
The bench mark is flange encased rod located 56.39 m (185.0 ft) west of mark 872
0004 F TIDAL, 18 m (59 ft) SW of an 8-inch square wooden gate post for the gate
into the recreation area park, 7.62 m (25.0 ft) NNW of the approximate center of
Crandall Road (A 4.9 m (16.0 ft) wide sand road), 4.8 m (15.8 ft) west of an
8-inch wooden corner fence post, 4.26 m (14.0 ft) east of a 24-inch cedar tree
and 0.85 m (2.8 ft) south of a barbed wire fence and carsonite witness post.
The bench mark is a stainless steel rod driven to refusal at a depth of 19.7 m
(64.8 ft) with an NGS logo cap set flush with the ground and about level with
Crandall Road. The datum point is recessed 0.12 m (0.4 ft) below the level of
the NGS logo cap. Access to the datum point is had through the 5-inch NGS logo
cap. 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 6
Station ID: 8720004 PUBLICATION DATE: 08/11/2009
Name: CRANDALL, ST. MARYS RIVER
FL
NOAA Chart: 11502 Latitude: 30° 43.3' N ( 30.72170)
USGS Quad: ST. MARYS Longitude: 81° 37.3' W ( -81.62170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0004 F 2004
DESIGNATION: 0004 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 19175
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 43.3' N ( 30.72170) LONGITUDE: 81° 37.4' W ( -81.62330)
The bench mark is a desk set flush in the top of a round concrete monument with
the ground located 56.54 m (185.5 ft) east of mark 872 0004 E TIDAL, 40.54 m
(133.0 ft) east of the center of the entrance gate into the recreation area
park, 13.72 m (45 ft) SW of the south bank of the St Marys River, 6.6 m (21.7
ft) north of the approximate center of Crandall Road (A 4.8 m (16.0 ft) wide
sand road), 0.76 m (2.5 ft) south of a 3-strand barbed wire fence and 0.15 m
(0.5 ft) south of a carsonite witness 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 5 of 6
Station ID: 8720004 PUBLICATION DATE: 08/11/2009
Name: CRANDALL, ST. MARYS RIVER
FL
NOAA Chart: 11502 Latitude: 30° 43.3' N ( 30.72170)
USGS Quad: ST. MARYS Longitude: 81° 37.3' W ( -81.62170)
T I D A L D A T U M S
Tidal datums at CRANDALL, ST. MARYS RIVER based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: February 1978 - May 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:
MEAN HIGHER HIGH WATER MHHW = 1.613
MEAN HIGH WATER MHW = 1.533
North American Vertical Datum NAVD88 = 0.862
MEAN SEA LEVEL MSL = 0.858
MEAN TIDE LEVEL MTL = 0.796
MEAN LOW WATER MLW = 0.058
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0004 C 1977 4.457 2.924
NO 4 1952 3.771 2.238
0004 D 1977 4.399 2.866
0004 E 2004 3.859 2.326
0004 F 2004 3.994 2.461
Foot Notes:
Bench marks 0004 E 2004 and 0004 F 2004 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: 8720004 PUBLICATION DATE: 08/11/2009
Name: CRANDALL, ST. MARYS RIVER
FL
NOAA Chart: 11502 Latitude: 30° 43.3' N ( 30.72170)
USGS Quad: ST. MARYS Longitude: 81° 37.3' W ( -81.62170)
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.