Superseded Bench Mark Sheet for 8728690, Apalachicola FL

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  7

                                                   PUBLICATION DATE:  05/11/1987
Station ID: 8728690                                SUPERCEDED DATE:   04/21/2003
Name:       APALACHICOLA, APALACHICOLA RIVER                  
            FLORIDA
NOAA Chart: 11401                                  Latitude:         29° 43.6' N
USGS Quad:  APALACHICOLA                           Longitude:        84° 58.9' W


To reach the tidal bench marks from the Post Office at the corner of Commerce
and D Streets in Apalachicola, proceed north along D Street one block to Water
Street, then NW along Water Street for 0.15 mile (0.24 km) to the U.S. Coast
Guard Light Attendant Station.  The bench marks are located throughout the city.
 The tide gage and staff are located at the east corner of the Coast Guard dock.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1933 14.124

MONUMENTATION:           Survey Disk                               VM#:      767
AGENCY:                                                            PID#:  AS0240
SETTING CLASSIFICATION:  Concrete Bannister


The bench mark is set flush in a concrete bannister on the NE corner of the
steps at the main entrance to the Post Office at the intersection of Commerce
and D Streets, 58 feet (18 m) SE of the centerline of D Street, 47 feet (14 m)
SW of the centerline of Commerce Street, 9.7 feet (3.0 m) SW of a flagpole, and
2.6 feet (0.8 m) above ground level.



                         BENCH MARK STAMPING:  APALACHICOLA 1934 15.771

MONUMENTATION:           Survey Disk                               VM#:      768
AGENCY:                                                            PID#:  AS0244
SETTING CLASSIFICATION:  Masonry Foundation


The bench mark is set flush in the top of the second layer of the masonry
foundation of Gorrie Monument, in the yard of Trinity Episcopal Church at the
intersection of 6th and D Streets, 101 feet (31 m) NE of the centerline of 6th
Street, 97 feet (30 m) NW of the centerline of D Street, 91 feet (28 m) east of
the SW corner of the church, and 78 feet (24 m) NNW of a fire hydrant.

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

                                                   PUBLICATION DATE:  05/11/1987
Station ID: 8728690                                SUPERCEDED DATE:   04/21/2003
Name:       APALACHICOLA, APALACHICOLA RIVER                  
            FLORIDA
NOAA Chart: 11401                                  Latitude:         29° 43.6' N
USGS Quad:  APALACHICOLA                           Longitude:        84° 58.9' W


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


                         BENCH MARK STAMPING:  J 45 1934 15.449

MONUMENTATION:           Survey Disk                               VM#:      769
AGENCY:                                                            PID#:  AS0241
SETTING CLASSIFICATION:  Stone Foundation


The bench mark is set flush in the top of the third tier of the stone foundation
of Marks Monument, east of the intersection of High and Columbus Streets, 188.0
feet (57.3 m) SW of the NW corner of steps at the north entrance to Franklin
County Court House, 110 feet (34 m) south of the east corner of the Gibson Inn
porch, 66 feet (20 m) SE of the centerline of Columbus Street, and 48 feet (15
m) west of the centerline of U.S. Highway 98.



                         BENCH MARK STAMPING:  APALACH HARBOR 5 1939

MONUMENTATION:           Survey Disk                               VM#:      770
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Sidewalk


The bench mark is set flush in a concrete sidewalk at the intersection of D and
Water Streets, 124 feet (38 m) ESE of Bench Mark 8690 E 1983, 82 feet    (25 m)
NNW of utility pole #JA829, 43.5 feet (13.3 m) east of the north corner of a
city building, 30 feet (9 m) north of the centerline of D Street, and 15 feet (5
m) NE of the centerline of Water Street.



                         BENCH MARK STAMPING:  NO 3 1974

MONUMENTATION:           Survey Disk                               VM#:      771
AGENCY:                                                            PID#:  AS0514
SETTING CLASSIFICATION:  Concrete Step


The bench mark is set flush in the concrete steps of the front entrance to
Wefings Marine Hardware, 155 feet (47 m) SW of Bench Mark NO 4 1974, 93 feet (28
m) NW of utility pole #830, 53.0 feet (16.2 m) WNW of the centerline of F
Street, and 30.9 feet (9.4 m) SW of the centerline of Water Street.

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

                                                   PUBLICATION DATE:  05/11/1987
Station ID: 8728690                                SUPERCEDED DATE:   04/21/2003
Name:       APALACHICOLA, APALACHICOLA RIVER                  
            FLORIDA
NOAA Chart: 11401                                  Latitude:         29° 43.6' N
USGS Quad:  APALACHICOLA                           Longitude:        84° 58.9' W


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


                         BENCH MARK STAMPING:  NO 4 1974

MONUMENTATION:           Survey Disk                               VM#:      772
AGENCY:                                                            PID#:  AS0242
SETTING CLASSIFICATION:  Flagpole Foundation


The bench mark is set flush in the north corner of a 5x5-foot (2x2 m) concrete
flagpole base at the U.S. Coast Guard Light Attendant Station, 108 feet (33 m)
NE of the centerline of Water Street, 49.3 feet (15.0 m) east of the east corner
of a boat house at the station, and 39.0 feet (11.9 m) NNE of the east corner of
the station.



                         BENCH MARK STAMPING:  8690 A 1978

MONUMENTATION:           Survey Disk                               VM#:      773
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is at the SW corner of Battery Park between two large live oak
trees, 177 feet (54 m) SE of the centerline of Market Street, 170 feet (52 m) NW
of the west corner of the boat basin, 113 feet (34 m) NNE of the centerline of
Bay Avenue, 36 feet (11 m) ENE of the centerline of 6th Street, and 0.3 foot
(0.1 m) south of a witness post.  The bench mark is crimped to a stainless steel
rod driven 28 feet (9 m), and encased in a PVC pipe and concrete kickblock.

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

                                                   PUBLICATION DATE:  05/11/1987
Station ID: 8728690                                SUPERCEDED DATE:   04/21/2003
Name:       APALACHICOLA, APALACHICOLA RIVER                  
            FLORIDA
NOAA Chart: 11401                                  Latitude:         29° 43.6' N
USGS Quad:  APALACHICOLA                           Longitude:        84° 58.9' W


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


                         BENCH MARK STAMPING:  8690 B 1978

MONUMENTATION:           Survey Disk                               VM#:      774
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is 13.5 feet (4.1 m) ESE of the center of the intersection of Bay
Avenue and 8th Street, 12 feet (4 m) WNW of utility pole #56X2250, and 3.5 feet
(1.1 m) SE of the south edge of Bay Avenue.  The bench mark is crimped to a
stainless steel rod driven 32 feet (10 m), and encased in a PVC pipe and
concrete kickblock.



                         BENCH MARK STAMPING:  8690 D 1983

MONUMENTATION:           Survey Disk                               VM#:      775
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Step


The bench mark is set flush in the NE corner of the bottom step of the north
entrance to Franklin County Courthouse, 187.5 feet (57.2 m) NE of Bench Mark J
45 1934 15.449, 106.0 feet (32.3 m) SW of the centerline of Commerce Street,
61.0 feet (18.6 m) east of the courthouse flagpole, 58.6 feet (17.9 m) SSE of
the centerline of Leslie Street, and 8.5 feet (2.6 m) WSW of the centerline of
the north entrance sidewalk to the courthouse.

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

                                                   PUBLICATION DATE:  05/11/1987
Station ID: 8728690                                SUPERCEDED DATE:   04/21/2003
Name:       APALACHICOLA, APALACHICOLA RIVER                  
            FLORIDA
NOAA Chart: 11401                                  Latitude:         29° 43.6' N
USGS Quad:  APALACHICOLA                           Longitude:        84° 58.9' W


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


                         BENCH MARK STAMPING:  8690 E 1983

MONUMENTATION:           Survey Disk                               VM#:      776
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set flush in the concrete foundation lip of Apalachicola
Volunteer Fire Department, in front of the second column north of the SE corner
of the building, between two 2-foot (1 m) high and 0.3-foot (0.1 m) diameter
steel pipes, 300 feet (91 m) SE of Bench Mark NO 3 1974, 247 feet (75 m) SSW of
the centerline of F Street, 162 feet (49 m) west of the west shoreline of
Apalachicola River, 35 feet (11 m) WSW of the centerline of Water Street, 15.2
feet (4.6 m) NW of the east corner of the fire station, and 0.8 foot (0.2 m)
east of the east face of the fire station.



                         BENCH MARK STAMPING:  NO STAMPING 1

MONUMENTATION:           Bottle in Concrete                        VM#:      777
AGENCY:                                                            PID#:  AS0250
SETTING CLASSIFICATION:  Bottle in Concrete


The bench mark is a bottle in a block of concrete located under a 20-foot    (6
m) tall cedar tree, at the intersection of 10th Street and Bay Avenue,  81 feet
(25 m) NW of utility pole # 56X2248, 52 feet (16 m) SE of the SE corner of a
residence, 45 feet (14 m) SW of the centerline of 10th Street, 20 feet (6 m) NW
of the centerline of Bay Avenue, and 3 feet (1 m) east of the cedar tree. 
(Note:  Bench mark referred to as 6 1915)

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

                                                   PUBLICATION DATE:  05/11/1987
Station ID: 8728690                                SUPERCEDED DATE:   04/21/2003
Name:       APALACHICOLA, APALACHICOLA RIVER                  
            FLORIDA
NOAA Chart: 11401                                  Latitude:         29° 43.6' N
USGS Quad:  APALACHICOLA                           Longitude:        84° 58.9' W


                            T I D A L   D A T U M S 


Tidal datums at APALACHICOLA, APALACHICOLA RIVER based on:

     LENGTH OF SERIES:      7 YEARS
     TIME PERIOD:           1979-1985
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8729840 PENSACOLA


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

     HIGHEST OBSERVED WATER LEVEL (11/21/1985)         =   7.45
     MEAN HIGHER HIGH WATER                     MHHW   =   1.66
     MEAN HIGH WATER                            MHW    =   1.52
     MEAN TIDE LEVEL                            MTL    =   0.97
     MEAN LOW WATER                             MLW    =   0.41
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   0.35
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (01/18/1981)         =  -1.69

   * NGVD is based on elevations published in Quad 290844, June, 1973 and NOS
     leveling of 1986. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1933 14.124                           14.46     12.94
     APALACHICOLA 1934 15.771                   16.12     14.60
     J 45 1934 15.449                           15.80     14.28
     APALACH HARBOR 5 1939                       6.20      4.68
     NO 3 1974                                   6.34      4.82
     NO 4 1974                                   3.46      1.94
     8690 A 1978                                 9.28      7.76
     8690 B 1978                                 5.63      4.11
     8690 D 1983                                12.35     10.83
     8690 E 1983                                 6.34      4.82
     NO STAMPING 1                              16.48     14.96


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

                                                   PUBLICATION DATE:  05/11/1987
Station ID: 8728690                                SUPERCEDED DATE:   04/21/2003
Name:       APALACHICOLA, APALACHICOLA RIVER                  
            FLORIDA
NOAA Chart: 11401                                  Latitude:         29° 43.6' N
USGS Quad:  APALACHICOLA                           Longitude:        84° 58.9' 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.

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