U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8720084 PUBLICATION DATE: 01/26/2010
Name: BOGGY CREEK, UPPER NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.3' N ( 30.58830)
USGS Quad: ITALIA Longitude: 81° 39.8' W ( -81.66330)
To reach the tidal bench marks from the intersection of Interstate Highway 95
and State Road A1A in Yulee, proceed west on State Road A1A for 1 km (1.6 mi) to
Edwards Road, then south and east on Edwards Road for 3.6 km (2.3 mi) to a
residence at 380 Edwards Road. The bench marks are located along the north side
of Boggy Creek (actually the Nassau River). The tide gage and staff were
located east of the south end of an abandoned dirt road on a catwalk pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BOGGY NO 1 1935
MONUMENTATION: Tidal Station disk VM#: 4998
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC1453
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 35.3' N ( 30.58833) LONGITUDE: 81° 39.8' W ( -81.66330)
The primary bench mark is a disk set in the top of a concrete filled clay tile
pipe projecting 0.2 m (0.5 ft) above the level of the ground, behind a 1-story
brick house at 380 Edwards Road, 35 m (115 ft) SE of bench mark BOGGY NO 2 1935,
21.2 m (69.4 ft) south of the SE corner of the house, 12 m (40 ft) north of the
north top of the bank of the Nassau River, and 1.097 m (3.6 ft) NE of a metal
witness post. NOTE: A magnet was buried at the south side of the mark.
BENCH MARK STAMPING: BOGGY NO 2 1935
MONUMENTATION: Tidal Station disk VM#: 4999
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC1454
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 35.3' N ( 30.58833) LONGITUDE: 81° 39.8' W ( -81.66330)
The bench mark is a disk set in a clay tile pipe projecting 0.24 m (0.8 ft)
above ground level, behind a 1-story brick house at 380 Edwards Road, 35 m (115
ft) NW of bench mark BOGGY NO 1 1935, 8.3 m (27.3 ft) WNW of the SW corner of
the house, 1 m (3.2 ft) east of a chain link fence along the west property line,
and 1.2 m (3.9 ft) north of a metal 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 2 of 5
Station ID: 8720084 PUBLICATION DATE: 01/26/2010
Name: BOGGY CREEK, UPPER NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.3' N ( 30.58830)
USGS Quad: ITALIA Longitude: 81° 39.8' W ( -81.66330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BOGGY NO 3 1935
MONUMENTATION: Tidal Station disk VM#: 5000
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC1455
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 35.4' N ( 30.59000) LONGITUDE: 81° 39.8' W ( -81.66330)
The bench mark is a disk set in top of concrete in a clay tile pipe, projecting
0.12 m (0.4 ft) above ground level, behind a 1-story brick house at 396 Edwards
Road, 18.6 m (61 ft) north of a wooden bulkhead along the Nassau River, 9.3 m
(30.6 ft) south of the SE corner of the house, 4 m (13 ft) west of a chain link
fence along the east line of the property, 2.9 m (9.5 ft) NE of the NW corner of
a wooden utility building, 0.6 m (2 ft) west of the south projection of the east
side of the house, and 0.3 m (1 ft) north of a carsonite witness post.
NOTE: A magnet was buried at the south side of the monument.
BENCH MARK STAMPING: BC 2 CLB 1978
MONUMENTATION: Tidal Station disk VM#: 19183
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: BC1451
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 35.9' N ( 30.59833) LONGITUDE: 81° 39.6' W ( -81.66000)
The bench mark is a disk set in the top of a concrete monument flush with the
ground, located 8.23 m (27 ft) north of the approximate centerline of Forest
Road 78, 3.353 m (11 ft) SE of a 12-inch pine tree, 2.43 m (8 ft) NE of a 4-inch
square wooden sign post marking Roads 78 AND 113, 1.8 m (6 ft) east of the
extended centerline of Road 113 heading south, and 0.67 m (2.2 ft) SW of a metal
witness post. NOTE: A magnet was buried at the south side of the monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8720084 PUBLICATION DATE: 01/26/2010
Name: BOGGY CREEK, UPPER NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.3' N ( 30.58830)
USGS Quad: ITALIA Longitude: 81° 39.8' W ( -81.66330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0084 G 2004
MONUMENTATION: Tidal Station disk VM#: 19184
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 35.4' N ( 30.59000) LONGITUDE: 81° 39.9' W ( -81.66500)
The bench mark is a disk located 42.3 m (142 ft) south of approximate centerline
of Edwards Road (as measured along the west line of the property at 75137
Edwards Road), 32.6 m (107 ft) north of the top of the north bank of the Nassau
River, 24.4 m (80.2 ft) ENE of the NW corner of a concrete boat ramp, 20.42 m
(67 ft) NE of the NE corner of the concrete boat ramp, and 1.49 m (4.9 ft) west
of a 4 ft high chain link fence and carsonite witness post. The datum point is
recessed 0.6 m (0.2 ft) below the level of the NGS logo cap, crimped to the top
of a stainless steel rod driven to refusal at a depth of 14.1 m (46.5 ft) with a
5-inch NGS logo cap flush with the ground and about level with Edwards Road.
Access to the datum point is had through the 5-inch NGS logo cap. NOTE 2: A
magnet was buried at the south side of the monument.
BENCH MARK STAMPING: 0084 H 2004
MONUMENTATION: Tidal Station disk VM#: 19185
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 35.4' N ( 30.59000) LONGITUDE: 81° 39.9' W ( -81.66500)
The bench mark is a disk set in the top of a round concrete monument flush with
the ground, located 12.5 m (41 ft) NE of the east end of an 18-inch metal
culvert under the parking lot drive, 11.43 m (37.5 ft) NW of the centerline of
Edwards Road, 0.3 m (1 ft) east of the northerly projection of the west line of
the property at 75137 Edwards Road, and 0.45 m (1.5 ft) west of a carsonite
witness post. NOTE: A magnet was buried at the south side of the monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8720084 PUBLICATION DATE: 01/26/2010
Name: BOGGY CREEK, UPPER NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.3' N ( 30.58830)
USGS Quad: ITALIA Longitude: 81° 39.8' W ( -81.66330)
D A T U M S
Datums at BOGGY CREEK, UPPER NASSAU RIVER based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: March 1978 - July 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8720220 MAYPORT (FERRY DEPOT), SAINT JOHNS RIVER
Elevations of datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.976
MEAN HIGH WATER MHW = 0.936
MEAN SEA LEVEL MSL = 0.574
MEAN TIDE LEVEL MTL = 0.494
North American Vertical Datum NAVD88 = 0.468
MEAN LOW WATER MLW = 0.052
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
BOGGY NO 1 1935 2.575 1.639
BOGGY NO 2 1935 2.866 1.930
BOGGY NO 3 1935 2.714 1.778
BC 2 CLB 1978 3.980 3.044
0084 G 2004 2.516 1.580
0084 H 2004 2.623 1.687
Foot Notes:
Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality Geodetic
heights of the bench marks meet all NOAA/NOS/NGS quality control standards for
Second Order, Class 1 leveling. It is advised that a confirmation set of levels
be established for bench marks 0084 G 2004, 0084 H 2004 and BC 2 CLB 1978 to
verify height differences before using tidal bench mark elevation information.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8720084 PUBLICATION DATE: 01/26/2010
Name: BOGGY CREEK, UPPER NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 35.3' N ( 30.58830)
USGS Quad: ITALIA Longitude: 81° 39.8' W ( -81.66330)
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.