U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8720119 PUBLICATION DATE: 01/26/2010
Name: MINK CREEK ENT., NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 32.2' N ( 30.53670)
USGS Quad: AMELIA CITY Longitude: 81° 34.9' W ( -81.58170)
To reach the tidal bench marks from the intersection of U.S. Highway 17 and
Yellow Bluff Road, proceed 3.0 km (1.87 mi) SE along Yellow Bluff Road to a dirt
road, on the left, leading NE which 0.16 km (535.0 ft) SE of a concrete bridge
over Grandaddy Branch, then proceed NE and SE on the dirt road 1.3 km (0.8 mi)
to an intersection with a dirt road heading NE, turn left and go 7.2 km (4.5 mi)
NE to the edge of marsh on the side of the Nassau River. The bench marks are
located 0.16 km (0.1 mi) NW at the high ground line. The tide gage and staff
were located on a 1.0 m by 1.0 m (4.0 ft by 4.0 ft) piling in the creek.
NOTE: Access through the gate at Yellow Bluff Road is restricted, contact Doug
Boree at (904)-751-5047 or (904)-545-4643 for access.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0119 A 1978
MONUMENTATION: Tidal Station disk VM#: 5031
AGENCY: National Ocean Survey (NOS) IDB PID#: DH9629
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 32.2' N ( 30.53670) LONGITUDE: 81° 34.7' W ( -81.57833)
The primary bench mark is a disk set flush in a concrete monument which sits
flush with the ground, 42.4 m (139.0 ft) SSE of bench mark MINK 1933, 28.0 m
(92.0 ft) ESE of bench mark MINK NO 1 1933, 4.9 m (15.7 ft) SSW of a 12-inch
cedar tree which sits 1.5 m (5.0 ft) from the edge of the marsh, 4.6 m (15.0 ft)
NW of an 18-inch palm tree which sits 5.5 m (6.0 ft) from the edge of the marsh,
3.7 m (12.0 ft) west of the edge of the marsh, 2.3 m (7.5 ft) south of a 15-inch
pine tree, 0.6 m (2.0 ft) NE of a metal witness post, and 0.3 m (1.0 ft) east of
a carsonite witness post. NOTE: A magnet was buried on 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: 8720119 PUBLICATION DATE: 01/26/2010
Name: MINK CREEK ENT., NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 32.2' N ( 30.53670)
USGS Quad: AMELIA CITY Longitude: 81° 34.9' W ( -81.58170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: MINK 1933
MONUMENTATION: Triangulation Station disk VM#: 5028
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC2337
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 32.2' N ( 30.53670) LONGITUDE: 81° 34.7' W ( -81.57830)
The bench mark is a disk set in a concrete monument projecting 0.2 m (0.7 ft) of
the level of the ground in the marsh, 42.4 m (139.0 ft) NNW of bench mark 0119 A
1978, 34.9 m (114.4 ft) ENE of bench mark MINK NO 2 1933, 27.0 m (88.5 ft) NNW
of bench mark MINK NO 1 1933, 9.3 m (30.5 ft) north of a 14-inch pine tree, 8.2
m (27.0 ft) NNW of a 15-inch palm tree, 7.3 m (24.0 ft) NE of an 11-inch cedar
tree, 6.6 m (21.8 ft) north of a 6-inch cedar tree, 2.4 m (8.0 ft) north of the
edge of the marsh, and 0.3 m (1.0 ft) NNE of a carsonite witness post. NOTE:
A magnet was buried on the south side of the mark.
BENCH MARK STAMPING: MINK NO 1 1933
MONUMENTATION: Reference Mark disk VM#: 5029
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AE4634
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 32.2' N ( 30.53670) LONGITUDE: 81° 34.7' W ( -81.57833)
The bench mark is a disk set in a concrete monument flush with the ground, 35.8
m (117.3 ft) SE of bench mark MINK NO 2 1933, 28 m (92 ft) WNW of bench mark
0119 A 1978, 27 m (88.5 ft) SSW of bench mark MINK 1933, 5.1 m (16.7 ft) ENE of
an 18-inch pine tree, 3.4 m (11.3 ft) SW of a 13-inch oak tree, 3.2 m (10.5 ft)
WNW of an 8-inch cedar tree, and 0.3 m (1.0 ft) east of a carsonite witness
post. NOTE: A magnet was buried on the south side of the mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8720119 PUBLICATION DATE: 01/26/2010
Name: MINK CREEK ENT., NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 32.2' N ( 30.53670)
USGS Quad: AMELIA CITY Longitude: 81° 34.9' W ( -81.58170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: MINK NO 2 1933
MONUMENTATION: Reference Mark disk VM#: 5030
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AE4635
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 32.2' N ( 30.53670) LONGITUDE: 81° 34.7' W ( -81.57833)
The bench mark is a disk set in the top of a concrete monument flush with the
ground, 35.8 m (117.3 ft) NW of bench mark MINK NO 1 1933, 34.9 m (114.4 ft) WSW
of bench mark MINK 1933, 25.5 m (83.8 ft) SE of bench mark 0119 B 1978, 7.6 m
(25.0 ft) SW of the edge of the marsh, 6.7 m (22.0 ft) WSW of a 9-inch cedar
tree, 2.5 m (8.3 ft) SW of a 14-inch pine tree, 2.0 m (6.5 ft) ENE of an 8-inch
oak tree, and 0.3 m (1.0 ft) NE of a carsonite witness post. NOTE: A magnet
was buried on the south side of the mark.
BENCH MARK STAMPING: 0119 B 1978
MONUMENTATION: Tidal Station disk VM#: 5032
AGENCY: National Ocean Survey (NOS) IDB PID#: DH9630
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 32.2' N ( 30.53670) LONGITUDE: 81° 34.7' W ( -81.57833)
The bench mark is a disk set in the top of a concrete monument flush with the
ground, 49.0 m (161.0 ft) WNW of bench mark MINK 1933, 25.5 m (83.8 ft) NW of
bench mark MINK NO 2 1933, 8.2 m (27.0 ft) south of the edge of the marsh, 5 m
(16.4 ft) SSE of a 10-inch cedar tree, (15.5 ft) ENE of a 14-inch palm tree, 4.7
m (8.2 ft) NE of a 13-inch pine tree, and 0.3 m (1.0 ft) NE of a carsonite
witness post. NOTE: A magnet was buried on the south side of the mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8720119 PUBLICATION DATE: 01/26/2010
Name: MINK CREEK ENT., NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 32.2' N ( 30.53670)
USGS Quad: AMELIA CITY Longitude: 81° 34.9' W ( -81.58170)
D A T U M S
Datums at MINK CREEK ENT., NASSAU RIVER based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: October 1978 - February 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8720098 NASSAUVILLE, NASSAU RIVER EAST
Elevations of datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.433
MEAN HIGH WATER MHW = 1.359
North American Vertical Datum NAVD88 = 0.833
MEAN SEA LEVEL MSL = 0.780
MEAN TIDE LEVEL MTL = 0.711
MEAN LOW WATER MLW = 0.062
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0119 A 1978 1.869 0.510
MINK 1933 1.794 0.435
MINK NO 1 1933 2.020 0.661
MINK NO 2 1933 1.903 0.544
0119 B 1978 1.704 0.345
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8720119 PUBLICATION DATE: 01/26/2010
Name: MINK CREEK ENT., NASSAU RIVER
FL
NOAA Chart: 11488 Latitude: 30° 32.2' N ( 30.53670)
USGS Quad: AMELIA CITY Longitude: 81° 34.9' W ( -81.58170)
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.