U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  09/15/1988
Station ID: 8724377                                SUPERCEDED DATE:   04/21/2003
Name:       SUGARLOAF SHORES NORTH, LOWER SUGARLOAF SOUND     
            FLORIDA
NOAA Chart: 11442                                  Latitude:         24° 38.4' N
USGS Quad:  SUGARLOAF                              Longitude:        81° 34.2' W


To reach the tidal bench marks from the post office in Sugarloaf Shores, proceed
0.4 mile (0.6 km) SW on U.S. Highway 1 to South Point Drive, then 0.35 mile (0.6
km) SE on South Point Drive 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 seawall of a private residence (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

MONUMENTATION:           Survey Disk                               VM#:     7041
AGENCY:                                                            PID#:  AA0730
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set in the concrete seawall at the rear of a private reidence
(95 South Point Drive), 71.0 feet (21.6 m) NW of the south corner of the
seawall, 65.0 feet (19.8 m) west of the west corner of the residence, and 12.5
feet (3.8 m) NE of a boat hoist.



                         BENCH MARK STAMPING:  NO 2 1974

MONUMENTATION:           Survey Disk                               VM#:     7042
AGENCY:                                                            PID#:  AA0731
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set in the concrete seawall at the rear of a private reidence
(95 South Point Drive), 62.1 feet (19.0 m) NE of the south corner of the
seawall, 17.7 feet (5.4 m) SW of the SW side of the residence, and at the SW
edge of steps to a boat slip.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                   PUBLICATION DATE:  09/15/1988
Station ID: 8724377                                SUPERCEDED DATE:   04/21/2003
Name:       SUGARLOAF SHORES NORTH, LOWER SUGARLOAF SOUND     
            FLORIDA
NOAA Chart: 11442                                  Latitude:         24° 38.4' N
USGS Quad:  SUGARLOAF                              Longitude:        81° 34.2' W


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


                         BENCH MARK STAMPING:  NO 3 1974

MONUMENTATION:           Survey Disk                               VM#:     7043
AGENCY:                                                            PID#:  AA0732
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set in the concrete seawall at the rear of a private reidence
(95 South Point Drive), 140 feet (42.7 m) SW of the centerline of South Point
Drive, and at the south end of the boat slip seawall.



                         BENCH MARK STAMPING:  NO 4 1974

MONUMENTATION:           Survey Disk                               VM#:     7044
AGENCY:                                                            PID#:  AA0733
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set in the concrete seawall at the rear of a private reidence,
0.45 mile (0.72 km) SE on South Point Drive, 124 feet (38 m) NE of the
centerline of South Point Drive, 35.6 feet (10.8 m) north of the north corner of
the residence, 0.3 foot (0.1 m) SW of the south corner of the SW boat hoist at
the boat slip.



                         BENCH MARK STAMPING:  NO 5 1974

MONUMENTATION:           Survey Disk                               VM#:     7045
AGENCY:                                                            PID#:  AA0734
SETTING CLASSIFICATION:  Concrete Step


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

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                   PUBLICATION DATE:  09/15/1988
Station ID: 8724377                                SUPERCEDED DATE:   04/21/2003
Name:       SUGARLOAF SHORES NORTH, LOWER SUGARLOAF SOUND     
            FLORIDA
NOAA Chart: 11442                                  Latitude:         24° 38.4' N
USGS Quad:  SUGARLOAF                              Longitude:        81° 34.2' W


                            T I D A L   D A T U M S 


Tidal datums at SUGARLOAF SHORES NORTH, LOWER SUGARLOAF SOUND based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           MAY 1974
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8724580 KEY WEST


Elevations of tidal datums referred to Mean Water Level (MWL), in FEET:

     HIGHEST OBSERVED WATER LEVEL (05/23/1974)         =   0.70
     MEAN SEA LEVEL                             MSL    =   0.00
     LOWEST  OBSERVED WATER LEVEL (05/18/1974)         =  -0.37

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1974                                   0.00      0.00
     NO 2 1974                                   0.00      0.00
     NO 3 1974                                   0.00      0.00
     NO 4 1974                                   0.00      0.00
     NO 5 1974                                   0.00      0.00


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

                                                   PUBLICATION DATE:  09/15/1988
Station ID: 8724377                                SUPERCEDED DATE:   04/21/2003
Name:       SUGARLOAF SHORES NORTH, LOWER SUGARLOAF SOUND     
            FLORIDA
NOAA Chart: 11442                                  Latitude:         24° 38.4' N
USGS Quad:  SUGARLOAF                              Longitude:        81° 34.2' W


                             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 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.