Bench Mark Sheet for 8720503, Red Bay Point, St Johns 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  7

                                                                                
Station ID: 8720503                         PUBLICATION DATE:  09/26/2011
Name:       RED BAY POINT, ST JOHNS RIVER                     
            FL
NOAA Chart: 11492                           Latitude:   29° 58.7' N (  29.97830)
USGS Quad:  GREEN COVE SPRINGS              Longitude:  81° 37.7' W ( -81.62830)


To reach the aqua trak (tide gage) from the junction of U.S. Highway 17 (Orange
Avenue) and State Road 16 (Ferris Street) in Green Cove Springs, go south on
U.S. Highway 17 and State Road 16 for 0.97 km (0.6 mi) to the junction of State
Road 16 East on the left, turn left on State Road 16 and go east for 3.78 km
(2.4 mi) to the junction of Shands Pier Road on the left, turn left on Shands
Pier Road and go north for 0.56 km (0.4 mi) to the south end of Shands Pier, go
north on Shands Pier for about 426.72 m (1400.0 ft) to a cut out section in the
pier where the aqua trak (tide gage) is located on the left.  The gage is
attached to the west side of the pier.  This location is about 152.40 m (500.0
ft) south of the north end of the pier.  Note:  This is a temporary aqua trak
(tide gage) which is subject to being removed.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  0503 B 1995
                         DESIGNATION:          872 0503 B TIDAL

MONUMENTATION:           Flange-encased Rod                    VM#:        13490
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE6867
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   29° 58.8' N (  29.97972)          LONGITUDE:  81° 38.1' W ( -81.63533)


The primary bench mark is a flange-encased rod located 96.01 m (315.0 ft) SSW of
the south end of the Shands Pier, 36.88 m (121.00 ft) NE of the approximate
centerline of Susan Drive (a paved road leading east), 22.43 m (73.6 ft) SE of
the approximate centerline of Shands Pier Road, 0.46 m (1.5 ft) NW of a 2.44 m
(8.0 ft) tall fence and 0.43 m (1.40 ft) NW of a carsonite witness post.  The
datum point is recessed 9.14 cm (0.3 ft) below the level of the NGS logo cap,
being the top of a stainless steel rod driven to refusal at a depth of 21.12 m
(69.3 ft) encased in a 5-inch logo cap flush with the ground.    

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8720503                         PUBLICATION DATE:  09/26/2011
Name:       RED BAY POINT, ST JOHNS RIVER                     
            FL
NOAA Chart: 11492                           Latitude:   29° 58.7' N (  29.97830)
USGS Quad:  GREEN COVE SPRINGS              Longitude:  81° 37.7' W ( -81.62830)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  0503 C 1995
                         DESIGNATION:          872 0503 C TIDAL

MONUMENTATION:           Flange-encased Rod                    VM#:        13491
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE6869
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: DE6869
LATITUDE:   29° 58.7' N (  29.97828)          LONGITUDE:  81° 38.2' W ( -81.63678)


The bench mark is a flange-encased rod located near the intersection of Shands
Pier Road and Susan Drive, 10.00 m (32.8 ft) NW of the approximate centerline of
Shands Pier Road, 5.67 m (18.6 ft) NE of the approximate centerline of a dirt
road, 3.66 m (12.0 ft) NE of a metal gate, 0.37 m (1.2 ft) SE of a barbwire
fence and 0.30 m (1.0 ft) SE of a carsonite witness post.  The datum point is
recessed 9.14 cm (0.3 ft) below the level of the NGS logo cap, being the top of
a stainless steel rod driven to refusal at a depth of 21.95 m (72 ft) encased in
a 5-inch logo cap flush with the ground.



                         BENCH MARK STAMPING:  0503 D 1995
                         DESIGNATION:          872 0503 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        13492
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE6870
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   29° 58.6' N (  29.97703)          LONGITUDE:  81° 38.3' W ( -81.63794)


The bench mark is a disk set in the top of a concrete monument flush with the
ground located at the intersection of State Road 16 and Shands Pier Road, 19.20
m (63.0 ft) north of the centerline of State Road 16, 11.16 m (36.6 ft) east of
the approximate centerline of Shands Pier Road and 0.76 m (2.5 ft) east of a
wooden power pole and carsonite witness post.      

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8720503                         PUBLICATION DATE:  09/26/2011
Name:       RED BAY POINT, ST JOHNS RIVER                     
            FL
NOAA Chart: 11492                           Latitude:   29° 58.7' N (  29.97830)
USGS Quad:  GREEN COVE SPRINGS              Longitude:  81° 37.7' W ( -81.62830)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  0503 E 1995
                         DESIGNATION:          872 0503 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        13493
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE6871
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   29° 58.6' N (  29.97694)          LONGITUDE:  81° 38.4' W ( -81.63919)


The bench mark is a disk set in the top of a concrete monument flush with the
ground located along State Road 16, 18.35 m (60.2 ft) south of the centerline of
State Road 16, 14.33 m (47.0 ft) east of the centerline of the entrance drive to
the John P. Hall, Sr. Nature Preserve (gate no. 28), and 21.34 cm (0.7 ft) north
of a wooden fence line with a carsonite witness post.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8720503                         PUBLICATION DATE:  09/26/2011
Name:       RED BAY POINT, ST JOHNS RIVER                     
            FL
NOAA Chart: 11492                           Latitude:   29° 58.7' N (  29.97830)
USGS Quad:  GREEN COVE SPRINGS              Longitude:  81° 37.7' W ( -81.62830)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  H 123 1945
                         DESIGNATION:          H 123

MONUMENTATION:           Bench Mark disk                       VM#:        16200
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AQ0009
SETTING CLASSIFICATION:  Concrete steam line base              OPUS PID:        
LATITUDE:   29° 58.8' N (  29.97917)          LONGITUDE:  81° 39.4' W ( -81.65667)


The bench mark is a disk set in the top of a concrete base for an abandoned
steam line located at the intersection of Reynolds Boulevard and Roland Avenue,
13.26 m (43.5 ft) south of the approximate centerline of Roland Avenue, 8.02 m
(26.3 ft) west of the approximate centerline of Reynolds Boulevard, 4.51 m (14.8
ft) north of the north rail and 0.73 m (2.4 ft) south of a capped off fire
hydrant, and 9.14 cm (0.3 ft) above the level of the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8720503                         PUBLICATION DATE:  09/26/2011
Name:       RED BAY POINT, ST JOHNS RIVER                     
            FL
NOAA Chart: 11492                           Latitude:   29° 58.7' N (  29.97830)
USGS Quad:  GREEN COVE SPRINGS              Longitude:  81° 37.7' W ( -81.62830)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  J 123 1945
                         DESIGNATION:          J 123

MONUMENTATION:           Bench Mark disk                       VM#:        16201
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AQ0011
SETTING CLASSIFICATION:  Hangar building wall                  OPUS PID:        
LATITUDE:   29° 58.5' N (  29.97583)          LONGITUDE:  81° 39.6' W ( -81.65972)


The bench mark is a disk set vertically in the SW corner of a building at the
Corbin Railway Service company (an old military hangar), on the south side of
the building, located 9.14 cm (0.3 ft) east of the SW corner, and 1.10 m (3.6
ft) above the level of the ground.  Before entering the property, permission
must be obtained from Frank Corley in the office at 1500 Bunker Avenue.  



                         BENCH MARK STAMPING:  0503 F 2004
                         DESIGNATION:          872 0503 F

MONUMENTATION:           Tidal Station disk                    VM#:        17775
AGENCY:                  FL Department of Environmental
                         Protection (FLDEP)                    IDB PID#:  DL5344
SETTING CLASSIFICATION:  Concrete sidewalk                     OPUS PID#: DL5344
LATITUDE:   29° 58.8' N (  29.98069)          LONGITUDE:  81° 38.1' W ( -81.63492)


The bench mark is a disk set flush in the concrete sidewalk entrance to the
pier, 5.15 m (16.9 ft) NW of the approximate centerline of the 6.10 m (20.0 ft)
wooden deck of the pier, 5.06 m (16.6 ft) north of the SE corner of a 1.62 m by
3.32 m (5.3 ft by 10.9 ft) planter that is 0.85 m (2.8 ft) high, 3.35 m (11.0
ft) NE of the NE corner of the planter, 0.27 m (0.9 ft) NW of the wooden deck of
the pier and 0.06 m (0.2 ft) south of the 7-inch concrete curb.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8720503                         PUBLICATION DATE:  09/26/2011
Name:       RED BAY POINT, ST JOHNS RIVER                     
            FL
NOAA Chart: 11492                           Latitude:   29° 58.7' N (  29.97830)
USGS Quad:  GREEN COVE SPRINGS              Longitude:  81° 37.7' W ( -81.62830)


                            T I D A L   D A T U M S 


Tidal datums at RED BAY POINT, ST JOHNS RIVER based on:

     LENGTH OF SERIES:      2 YEARS
     TIME PERIOD:           November 2003 - October 2005
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8720218 BAR PILOTS DOCK, ST JOHNS RIVER


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     HIGHEST OBSERVED WATER LEVEL (09/27/2004)         =  1.197
     MEAN HIGHER HIGH WATER                     MHHW   =  0.305
     MEAN HIGH WATER                            MHW    =  0.290
     North American Vertical Datum              NAVD88 =  0.177
     MEAN SEA LEVEL                             MSL    =  0.164
     MEAN TIDE LEVEL                            MTL    =  0.158
     MEAN LOW WATER                             MLW    =  0.026
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (04/14/2004)         = -0.403

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     0503 B 1995                                 1.454    1.164
     0503 C 1995                                 1.981    1.691
     0503 D 1995                                 2.546    2.256
     0503 E 1995                                 3.345    3.055
     H 123 1945                                  3.305    3.015
     J 123 1945                                  5.858    5.568
     0503 F 2004                                 1.465    1.175


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  7

                                                                                
Station ID: 8720503                         PUBLICATION DATE:  09/26/2011
Name:       RED BAY POINT, ST JOHNS RIVER                     
            FL
NOAA Chart: 11492                           Latitude:   29° 58.7' N (  29.97830)
USGS Quad:  GREEN COVE SPRINGS              Longitude:  81° 37.7' W ( -81.62830)


                             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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