Bench Mark Sheet for 8724377, SUGARLOAF SHORES NORTH 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8724377                         PUBLICATION DATE:  04/13/2005
Name:       SUGARLOAF SHORES NORTH                            
            FL
NOAA Chart: 11442                           Latitude:   24° 38.4' N (  24.64000)
USGS Quad:  SUGARLOAF KEY                   Longitude:  81° 34.2' W ( -81.57000)


To reach the tidal bench marks from the post office in Sugarloaf Shores, proceed
0.6 km (0.4 mi) SW on U.S. Highway 1 to South Point Drive, then turn left and
proceed SE on  South Point Drive for 0.6 km (0.4 mi) to a private residence at
95 South Point Drive.  The bench marks are on the right (NW) and left (NE) of
South Point Drive.  The tide gage and staff were located on the sea wall of the
private residence at 95 South Point Drive.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1974
                         DESIGNATION:          872 4377 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         7041
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0730
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 38.4' N (  24.64000)          LONGITUDE:  81° 34.2' W ( -81.57000)


The primary bench mark is a disk set in the concrete sea wall at the rear of the
private reidence at 95 South Point Drive, 21.64 m (71.0 ft) NW of the south
corner of the sea wall, 19.81 m (65.0 ft) west of the west corner of the
residence, and 3.81 m (12.5 ft) NE of a boat hoist.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8724377                         PUBLICATION DATE:  04/13/2005
Name:       SUGARLOAF SHORES NORTH                            
            FL
NOAA Chart: 11442                           Latitude:   24° 38.4' N (  24.64000)
USGS Quad:  SUGARLOAF KEY                   Longitude:  81° 34.2' W ( -81.57000)


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


                         BENCH MARK STAMPING:  NO 2 1974
                         DESIGNATION:          872 4377 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         7042
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0731
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 38.4' N (  24.64000)          LONGITUDE:  81° 34.2' W ( -81.57000)


The bench mark is a disk set in the concrete sea wall at the rear of the private
reidence at 95 South Point Drive, 18.93 m (62.1 ft) NE of the south corner of
the sea wall, 5.39 m (17.7 ft) SW of the SW side of the residence, and at the SW
edge of steps to a boat slip.



                         BENCH MARK STAMPING:  NO 3 1974
                         DESIGNATION:          872 4377 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:         7043
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0732
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 38.4' N (  24.64000)          LONGITUDE:  81° 34.2' W ( -81.57000)


The bench mark is a disk set in the concrete sea wall at the rear of the private
reidence at 95 South Point Drive, 42.67 m (140.0 ft) SW of the centerline of
South Point Drive, and at the south end of the boat slip sea wall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8724377                         PUBLICATION DATE:  04/13/2005
Name:       SUGARLOAF SHORES NORTH                            
            FL
NOAA Chart: 11442                           Latitude:   24° 38.4' N (  24.64000)
USGS Quad:  SUGARLOAF KEY                   Longitude:  81° 34.2' W ( -81.57000)


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


                         BENCH MARK STAMPING:  NO 4 1974
                         DESIGNATION:          872 4377 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         7044
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0733
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 38.3' N (  24.63830)          LONGITUDE:  81° 34.0' W ( -81.56670)


The bench mark is a disk set in the concrete sea wall at the rear of the private
reidence at 95 South Point Drive, 0.72 km (0.45 mi) SE on South Point Drive, 38
m (124 ft) NE of the centerline of South Point Drive, 10.85 m (35.6 ft) north of
the north corner of the residence, 0.1 m (0.3 ft) SW of the south corner of the
SW boat hoist at the boat slip.



                         BENCH MARK STAMPING:  NO 5 1974
                         DESIGNATION:          872 4377 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:         7045
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0734
SETTING CLASSIFICATION:  Concrete step                         OPUS PID:        
LATITUDE:   24° 38.3' N (  24.63830)          LONGITUDE:  81° 34.0' W ( -81.56670)


The bench mark is a disk set in the top of a concrete step at the rear of the
private residence at 95 South Point Drive, 0.72 km (0.45 mi) SE on South Point
Drive, 18 m (58 ft) east of the north corner of the residence, 13 m (43 ft) west
of the east end of the sea wall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8724377                         PUBLICATION DATE:  04/13/2005
Name:       SUGARLOAF SHORES NORTH                            
            FL
NOAA Chart: 11442                           Latitude:   24° 38.4' N (  24.64000)
USGS Quad:  SUGARLOAF KEY                   Longitude:  81° 34.2' W ( -81.57000)


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


                         BENCH MARK STAMPING:  Q 272 1966
                         DESIGNATION:          Q 272

MONUMENTATION:           Bench Mark disk                       VM#:         7046
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:  AA0127
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   24° 38.6' N (  24.64330)          LONGITUDE:  81° 34.3' W ( -81.57170)


The bench mark is a disk located 10 m (32 ft) NW of the centerline of the
highway, and 0.6 m (2 ft) NE of cable line pole 19508.  The mark is set 0.6 m (2
ft) below highway level, crimped to the top of a copper-clad steel rod driven
7.3 m (24 ft) to refusal, encased by a 6 inch terra cotta pipe.  NOTE: Mark not
found in 1988 by US Power Squadron.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8724377                         PUBLICATION DATE:  04/13/2005
Name:       SUGARLOAF SHORES NORTH                            
            FL
NOAA Chart: 11442                           Latitude:   24° 38.4' N (  24.64000)
USGS Quad:  SUGARLOAF KEY                   Longitude:  81° 34.2' W ( -81.57000)


                            T I D A L   D A T U M S 


Tidal datums at SUGARLOAF SHORES NORTH based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           May 1974 - May 1974
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8724580 KEY WEST


Elevations of tidal datums referred to Mean Sea Level (MSL), in METERS:

     North American Vertical Datum              NAVD88 =  0.144
     MEAN SEA LEVEL                             MSL    =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                                MSL

     NO 1 1974                                            0.880
     NO 2 1974                                            0.845
     NO 3 1974                                            0.853
     NO 4 1974                                            0.919
     NO 5 1974                                            0.712
     Q 272 1966                                           1.601


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

                                                                                
Station ID: 8724377                         PUBLICATION DATE:  04/13/2005
Name:       SUGARLOAF SHORES NORTH                            
            FL
NOAA Chart: 11442                           Latitude:   24° 38.4' N (  24.64000)
USGS Quad:  SUGARLOAF KEY                   Longitude:  81° 34.2' W ( -81.57000)


                             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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