U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                   PUBLICATION DATE:  08/31/1987
Station ID: 8726724                                SUPERCEDED DATE:   04/21/2003
Name:       CLEARWATER BEACH, GULF OF MEXICO                  
            FLORIDA
NOAA Chart: 11412                                  Latitude:         27° 58.6' N
USGS Quad:  CLEARWATER                             Longitude:        82° 49.9' W


To reach the tidal bench marks from the intersection of U.S. Highway 19 and
State Road 60 (Gulf to Bay Blvd.), proceed approximately 6 miles (10 km) west
across Memorial Causeway to Causeway Boulevard, then across Gulfview Boulevard
to the public parking area for Big Pier 60.  The bench marks are located in the
vicinity of the Clearwater Marina and the tide gage and electric tape are
located at the seaward end of Big Pier 60 below the elevated observation deck.


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


                 PRIMARY BENCH MARK STAMPING:  LP 10 RM 1

MONUMENTATION:           Survey Disk                               VM#:      742
AGENCY:                                                            PID#:  AG7197
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in a 1.5 foot (0.5 m) wide concrete seawall near the
SW corner of the Clearwater Marina yacht basin, on the east side of the
T-intersection of Coronado Drive and Gulfview Boulevard, directly under an iron
handrail, and 1 foot (0.3 m) north of the curve in the seawall.



                         BENCH MARK STAMPING:  AWL 1941

MONUMENTATION:           Survey Disk                               VM#:      744
AGENCY:                                                            PID#:  AG0307
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in the top center of a 2 foot (0.6 m) wide concrete
seawall midway between the old and new Causeway Boulevard bridges, 41.0 feet
(12.5 m) north of the centerline of the old bridge (now a fishing pier), 29.9
feet (9.1 m) SE of the SW abutment of the new bridge, and 24.5 feet (7.5 m)
south of the south side of the new bridge.

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

                                                   PUBLICATION DATE:  08/31/1987
Station ID: 8726724                                SUPERCEDED DATE:   04/21/2003
Name:       CLEARWATER BEACH, GULF OF MEXICO                  
            FLORIDA
NOAA Chart: 11412                                  Latitude:         27° 58.6' N
USGS Quad:  CLEARWATER                             Longitude:        82° 49.9' W


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


                         BENCH MARK STAMPING:  6724 A 1978

MONUMENTATION:           Survey Disk                               VM#:      745
AGENCY:                                                            PID#:  AG7196
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in the concrete seawall cap at the NW corner of the
Clearwater Marina, east of Coronado Drive, and 0.5 foot (0.2 m) north of the
handrail around the sidewalk at the west end of the marina parking lot.



                         BENCH MARK STAMPING:  6724 K 1978

MONUMENTATION:           Survey Disk                               VM#:      746
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in the top of a concrete seawall on the north side
of the Clearwater Marina yacht basin, in line with the west face of the marina
building, 35.3 feet (10.8 m) ESE of a fire hydrant, and 25 feet (7.6 m) south of
the SW corner of the marina building.



                         BENCH MARK STAMPING:  6724 L 1978

MONUMENTATION:           Survey Disk                               VM#:      747
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in the top of the concrete seawall at the SE corner
of the Clearwater Marina, 40 feet (12 m) south of the centerline of the
baithouse pier, 1 foot (0.3 m) west of the east edge of the seawall, and 1 foot
(0.3 m) north of the south edge of the seawall.

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

                                                   PUBLICATION DATE:  08/31/1987
Station ID: 8726724                                SUPERCEDED DATE:   04/21/2003
Name:       CLEARWATER BEACH, GULF OF MEXICO                  
            FLORIDA
NOAA Chart: 11412                                  Latitude:         27° 58.6' N
USGS Quad:  CLEARWATER                             Longitude:        82° 49.9' W


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


                         BENCH MARK STAMPING:  6724 N 1984

MONUMENTATION:           Survey Disk                               VM#:      748
AGENCY:                                                            PID#:  AG9359
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is near the parking lot at the foot of Big Pier 60, 228 feet (69
m) south of the south handrail of the pier, 103 feet (31 m) north of public
beach shower #2, 84 feet (26 m) south of public beach shower #1, 33 feet (10 m)
east of a concrete seawall, 3 feet (1 m) west of the centerline of the sidewalk
along the west side of the parking area, and next to a fiberglass witness post. 
The bench mark is 0.4 foot (0.1 m) below ground level, crimped to the top of a
stainless steel rod driven 41 feet (12 m) to refusal, and encased in a PVC pipe
and concrete kickblock.



                         BENCH MARK STAMPING:  CITY OF CLEARWATER DE 3

MONUMENTATION:           Survey Disk                               VM#:      749
AGENCY:                                                            PID#:  AG0482
SETTING CLASSIFICATION:  Concrete Curb


The bench mark is set flush in a concrete curb near the NE corner of the
Clearwater Marina building, near the Post Office ramp, 15 feet (5 m) NNE of the
NE corner of the Post Office, 0.3 foot (0.1 m) from the end of the north curb,
and 0.3 foot (0.1 m) from the end of the east curb.

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

                                                   PUBLICATION DATE:  08/31/1987
Station ID: 8726724                                SUPERCEDED DATE:   04/21/2003
Name:       CLEARWATER BEACH, GULF OF MEXICO                  
            FLORIDA
NOAA Chart: 11412                                  Latitude:         27° 58.6' N
USGS Quad:  CLEARWATER                             Longitude:        82° 49.9' W


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


                         BENCH MARK STAMPING:  NO STAMPING 1

MONUMENTATION:           Survey Disk                               VM#:      750
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Bridge Abutment


The bench mark is set flush in the top center of a 0.9 foot (0.3 m) wide
concrete abutment at the SW end of the Causeway Boulevard bridge (marked
H-20-44), 36.5 feet (11.1 m) south of the centerline of the bridge, 7.4 feet
(2.3 m) west of the SW abutment, and 2.8 feet (0.9 m) above the sidewalk.

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

                                                   PUBLICATION DATE:  08/31/1987
Station ID: 8726724                                SUPERCEDED DATE:   04/21/2003
Name:       CLEARWATER BEACH, GULF OF MEXICO                  
            FLORIDA
NOAA Chart: 11412                                  Latitude:         27° 58.6' N
USGS Quad:  CLEARWATER                             Longitude:        82° 49.9' W


                            T I D A L   D A T U M S 


Tidal datums at CLEARWATER BEACH, GULF OF MEXICO based on:

     LENGTH OF SERIES:      10 YEARS
     TIME PERIOD:           1974-1984
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8727520 CEDAR KEY


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

     HIGHEST OBSERVED WATER LEVEL (01/09/1978)         =   5.07
     MEAN HIGHER HIGH WATER                     MHHW   =   2.74
     MEAN HIGH WATER                            MHW    =   2.40
     MEAN TIDE LEVEL                            MTL    =   1.47
     MEAN LOW WATER                             MLW    =   0.53
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (01/19/1977)         =  -2.38

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     LP 10 RM 1                                  5.79      3.39
     AWL 1941                                    9.16      6.76
     6724 A 1978                                 5.90      3.50
     6724 K 1978                                 5.85      3.45
     6724 L 1978                                 5.87      3.47
     6724 N 1984                                 7.43      5.03
     CITY OF CLEARWATER DE 3                     6.70      4.30
     NO STAMPING 1                              18.26     15.86


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

                                                   PUBLICATION DATE:  08/31/1987
Station ID: 8726724                                SUPERCEDED DATE:   04/21/2003
Name:       CLEARWATER BEACH, GULF OF MEXICO                  
            FLORIDA
NOAA Chart: 11412                                  Latitude:         27° 58.6' N
USGS Quad:  CLEARWATER                             Longitude:        82° 49.9' 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.