Bench Mark Sheet for 8720119, MINK CREEK ENT., NASSAU RIVER FL

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          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.

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