Superseded Bench Mark Sheet for 8721223, TURTLE MOUND FL

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  11/19/1987
Station ID: 8721223                                SUPERCEDED DATE:   04/21/2003
Name:       TURTLE MOUND, INDIAN RIVER NORTH                  
            FLORIDA
NOAA Chart: 11485                                  Latitude:         28° 55.6' N
USGS Quad:  ARIEL                                  Longitude:        80° 49.5' W


To reach the tidal bench marks from the intersection of State Highway A1A and
U.S. Highway 1 in New Smyrna Beach, proceed 10 miles (16 km) east then south on
State Highway A1A to the dirt drive leading south on the east side of the dead
end of State Highway A1A, then 0.1 mile (0.2 km) on the dirt road to another
dirt road leading west to the middle dock of three on Mosquito Lagoon.  The
bench marks are located along State Highway A1A and the dirt road leading south.
 The tide gage and staff were located 62 feet (19 m) west of the shore inside
the northeast corner of the T-section dock.


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


                 PRIMARY BENCH MARK STAMPING:  R-212 VOL 72

MONUMENTATION:           Survey Disk                               VM#:     5310
AGENCY:                                                            PID#:  AK6911
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set flush in the top of a concrete monument just north of the
Shell Mound, 0.1 mile (0.2 km) south of Bench Mark R-211 VOL 72, 350 feet (107
m) ESE of the boat ramp at the Turtle Mound Historical Site, 49 feet (15 m) east
of the centerline of State Highway A1A, 28 feet (9 m) west of the dirt road
continuation of the paved road that runs parallel to the east side of State
Highway A1A, 2.3 feet (0.7 m) west of a witness post, and at ground level.



                         BENCH MARK STAMPING:  R-211 VOL 72

MONUMENTATION:           Survey Disk                               VM#:     5309
AGENCY:                                                            PID#:  AK6912
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set flush in the top of a concrete monument just north of the
north boundary of the Canaveral National Seashore, 300 feet (91 m) NNE of the
intersection of State Highway A1A and the dirt road leading west to the Turtle
Mound Historical Site, 145 feet (44 m) north of Bench Mark RM-NO2 79 78 A10,
44.6 feet (13.6 m) east of the centerline of State Highway A1A, 5 feet (2 m)
south of a witness post, and 0.3 foot (0.1 m) below ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                   PUBLICATION DATE:  11/19/1987
Station ID: 8721223                                SUPERCEDED DATE:   04/21/2003
Name:       TURTLE MOUND, INDIAN RIVER NORTH                  
            FLORIDA
NOAA Chart: 11485                                  Latitude:         28° 55.6' N
USGS Quad:  ARIEL                                  Longitude:        80° 49.5' W


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


                         BENCH MARK STAMPING:  R-213 VOL 72

MONUMENTATION:           Survey Disk                               VM#:     5311
AGENCY:                                                            PID#:  AK6910
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set flush in a concrete monument, 0.15 mile (0.24 km) south of
Bench Mark R-212 VOL 72, 75 feet (23 m) west of the beach, 25.6 feet (7.8 m)
south of power pole #9015, 23 feet (7 m) east of the dirt drive that continues
along the east side of the dead end of State Highway A1A, and 5.0 feet (1.5 m)
south of a DNR witness post.



                         BENCH MARK STAMPING:  RM NO 1 79 78 A10

MONUMENTATION:           Survey Disk                               VM#:     5312
AGENCY:                                                            PID#:  AK5463
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set flush in the top of a concrete monument NE of the parking
lot of State Highway A1A, 150 feet (46 m) west of the ocean, 48 feet (15 m) east
of the centerline of Highway A1A, 26.6 feet (8.1 m) WNW of Bench Mark RM NO 2 79
78 A10, 13.6 feet (4.1 m) west of the paved road that runs parallel to the east
side of State Highway A1A, 0.8 foot (0.2 m) east of a DOT witness post, and at
ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                   PUBLICATION DATE:  11/19/1987
Station ID: 8721223                                SUPERCEDED DATE:   04/21/2003
Name:       TURTLE MOUND, INDIAN RIVER NORTH                  
            FLORIDA
NOAA Chart: 11485                                  Latitude:         28° 55.6' N
USGS Quad:  ARIEL                                  Longitude:        80° 49.5' W


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


                         BENCH MARK STAMPING:  RM NO 2 79 78 A10

MONUMENTATION:           Survey Disk                               VM#:     5313
AGENCY:                                                            PID#:  AK5462
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set flush in the top of a concrete monument east of the paved
road that runs parallel to the east side of State Highway A1A, 80 feet (24 m)
east of the centerline of Highway A1A, 30 feet (9 m) ENE of Bench Mark 79 78
A10, 13 feet (4 m) east of the centerline of the paved road that runs parallel
to the east side of Highway A1A, 0.5 foot (0.2 m) NNW of a witness post, and 0.2
foot (0.1 m) above ground level.



                         BENCH MARK STAMPING:  79 78 A10

MONUMENTATION:           Survey Disk                               VM#:     5314
AGENCY:                                                            PID#:  AK5461
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set flush in the top of a concrete monument north of the dead
end of Highway A1A, 48 feet (15 m) east of the centerline of Highway A1A, 23.6
feet (7.2 m) south of Bench Mark RM NO 1 79 78 A10, 11.6 feet (3.5 m) west of
the centerline of the paved road that runs parallel to the east side of State
Highway A1A, 1.6 feet (0.5 m) east of a DNR witness post, and 0.3 foot (0.1 m)
below ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                   PUBLICATION DATE:  11/19/1987
Station ID: 8721223                                SUPERCEDED DATE:   04/21/2003
Name:       TURTLE MOUND, INDIAN RIVER NORTH                  
            FLORIDA
NOAA Chart: 11485                                  Latitude:         28° 55.6' N
USGS Quad:  ARIEL                                  Longitude:        80° 49.5' W


                            T I D A L   D A T U M S 


Tidal datums at TURTLE MOUND, INDIAN RIVER NORTH based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           FEBRUARY-MARCH 1979
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8720030 FERNANDINA


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

     HIGHEST OBSERVED WATER LEVEL (12/04/1978)         =   1.06
     MEAN HIGHER HIGH WATER                     MHHW   =   0.58
     MEAN HIGH WATER                            MHW    =   0.50
     MEAN TIDE LEVEL                            MTL    =   0.27
     MEAN LOW WATER                             MLW    =   0.03
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (03/15/1979)         =  -0.92

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     R-212 VOL 72                               11.62     11.12
     R-211 VOL 72                                7.81      7.31
     R-213 VOL 72                               16.67     16.17
     RM NO 1 79 78 A10                          10.20      9.70
     RM NO 2 79 78 A10                          11.32     10.82
     79 78 A10                                   9.98      9.48


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

                                                   PUBLICATION DATE:  11/19/1987
Station ID: 8721223                                SUPERCEDED DATE:   04/21/2003
Name:       TURTLE MOUND, INDIAN RIVER NORTH                  
            FLORIDA
NOAA Chart: 11485                                  Latitude:         28° 55.6' N
USGS Quad:  ARIEL                                  Longitude:        80° 49.5' 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.

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