Superseded Bench Mark Sheet for 8727520, Cedar Key FL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:  03/03/1993
Station ID: 8727520                                SUPERCEDED DATE:   04/21/2003
Name:       CEDAR KEY, GULF OF MEXICO                         
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  8.1' N
USGS Quad:  CEDAR KEY                              Longitude:        83°  1.9' W


To reach the tidal bench marks from the Post Office at Second Avenue and C
Street in Cedar Key, proceed SE on C Street for 0.2 mile (0.03 km) to Levy
County Pier.  The bench marks are in the area between the Fish House and G
Street going east/west and between Whiddon Street and the county pier going
north/south.  The tide gauge and staff are at the NW end of the restroom
building near the foot of the pier.


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


                 PRIMARY BENCH MARK STAMPING:  8 1910

MONUMENTATION:           Survey Disk                               VM#:      751
AGENCY:                                                            PID#:  AR1204
SETTING CLASSIFICATION:  Concrete Monument


The primary bench mark is set in a cement-filled terra cotta pipe, one-half
block NW along C Street from its intersection with Second Street, 53.5 feet
(16.3 m) NE of the centerline of C Street, 22.5 feet (6.9 m) NW of the north
corner of a large two- story building, 3.5 feet (1.1 m) SW of the SW edge of a
concrete wall, and 0.2 foot (0.06 m) below the ground.



                         BENCH MARK STAMPING:  16 1923

MONUMENTATION:           Survey Disk                               VM#:      752
AGENCY:                                                            PID#:  AR1201
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set vertically in the west foundation wall near the NW corner
of Cedar Key Seafood Packing Plant, on the south side of Third Street east of
abandoned railroad station, 96.0 feet (29 m) north of the centerline of Second
Street, 2.5 feet (0.8 m) above the ground, and 0.5 foot (0.2 m) below the bottom
course of cement blocks.

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

                                                   PUBLICATION DATE:  03/03/1993
Station ID: 8727520                                SUPERCEDED DATE:   04/21/2003
Name:       CEDAR KEY, GULF OF MEXICO                         
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  8.1' N
USGS Quad:  CEDAR KEY                              Longitude:        83°  1.9' W


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


                         BENCH MARK STAMPING:  17 1923

MONUMENTATION:           Survey Disk                               VM#:      753
AGENCY:                                                            PID#:  AR1203
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set vertically in the SW face of the south corner of Island
Hotel at the north corner of the intersection of Second and B Streets, 32 feet
(10 m) NW of the centerline of Second Street, 32 feet (10 m) NE of the
centerline of B Street, 2.5 feet (0.8 m) NW of the SW corner of Island Hotel,
and 4.0 feet (1.2 m) above the pavement.



                         BENCH MARK STAMPING:  18 1923

MONUMENTATION:           Survey Disk                               VM#:      754
AGENCY:                                                            PID#:  AR1211
SETTING CLASSIFICATION:  Sidewalk


The bench mark is set flush near the inner edge of the east end of a concrete
sidewalk at the south corner of Second and C Streets, 30.5 feet (9.3 m) SW of
the centerline of C Street, 27.0 feet (8.2 m) south of the centerline of Second
Street, 9.2 feet (2.8 m) north of the NE corner of a small white house, and 10.0
feet (3.0 m) SE of the SE curb of Second Street.

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

                                                   PUBLICATION DATE:  03/03/1993
Station ID: 8727520                                SUPERCEDED DATE:   04/21/2003
Name:       CEDAR KEY, GULF OF MEXICO                         
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  8.1' N
USGS Quad:  CEDAR KEY                              Longitude:        83°  1.9' W


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


                         BENCH MARK STAMPING:  NO 25 1953

MONUMENTATION:           Survey Disk                               VM#:      755
AGENCY:                                                            PID#:  AR1217
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set flush in the top of the base of a sediment basin, 0.2 mile
(0.3 km) SE along G Street from Cedar Key High School, at the SW corner of the
intersection of G and Fourth Streets, 34.0 feet (10.4 m) NE of the SW corner of
the concrete sea wall around the sediment basin, 32.5 feet (9.9 m) SW of
transformer pole #635, 21.0 feet (6.4 m) south of the extended centerline of
Fourth Street, 15.0 feet (4.6 m) west of the centerline of G Street, 1.5 feet
(0.5 m) SW of the north corner of basin, and 0.5 feet (0.2 m) south of the north
wall.



                         BENCH MARK STAMPING:  D 280

MONUMENTATION:           Survey Disk                               VM#:      756
AGENCY:                                                            PID#:  AR1210
SETTING CLASSIFICATION:  Concrete Curb


The bench mark is set in the SW curb of the C Street concrete bridge leading to
the fishing pier, one block SW of the post office building, directly over the SW
end of the NW one of two piers, 100 feet (30 m) SE of the NW end of the bridge,
and 0.5 foot (0.2 m) SW of the SW bridge curb.

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

                                                   PUBLICATION DATE:  03/03/1993
Station ID: 8727520                                SUPERCEDED DATE:   04/21/2003
Name:       CEDAR KEY, GULF OF MEXICO                         
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  8.1' N
USGS Quad:  CEDAR KEY                              Longitude:        83°  1.9' W


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


                         BENCH MARK STAMPING:  D 290

MONUMENTATION:           Survey Disk                               VM#:      757
AGENCY:                                                            PID#:  AR1665
SETTING CLASSIFICATION:  Concrete Sea Wall


The bench mark is set flush in the top of a concrete sea wall on the north side
of a small boat basin between B and C Streets, 89.0 feet (27.1 m) SE of the
centerline of First Street, and 0.5 foot (0.2 m) NE of the SW end of the sea
wall.



                         BENCH MARK STAMPING:  TANK 1933

MONUMENTATION:           Survey Disk                               VM#:      758
AGENCY:                                                            PID#:  AR1218
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set flush in the top of a concrete monument at the SW corner
of Whiddon Road and G Street, 123 feet (37 m) south of the centerline of Ninth
Street, 53 feet (16 m) west of the centerline of G Street, 25 feet (8 m) ESE of
the NW leg of the municipal water tank, 15 feet (5 m) NNW of the main pipe of
the tank, 13 feet (4 m) south of the SW corner of the base of the NW leg of the
tank, and 0.3 foot (0.1 m) above ground level.



                         BENCH MARK STAMPING:  TANK NO 3 1933

MONUMENTATION:           Survey Disk                               VM#:      759
AGENCY:                                                            PID#:  AR1219
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in the top of a concrete monument, 42 feet (13 m) SW of
the SW curb of Whiddon Road, 28.5 feet (8.7 m) north of the NW corner of the
concrete base of the west leg of the water tower, 24.2 feet (7.4 m) NW of Bench
Mark TANK 1933, 4 feet (1 m) above the street level, and 0.2 foot (0.1 m) above
ground level.

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

                                                   PUBLICATION DATE:  03/03/1993
Station ID: 8727520                                SUPERCEDED DATE:   04/21/2003
Name:       CEDAR KEY, GULF OF MEXICO                         
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  8.1' N
USGS Quad:  CEDAR KEY                              Longitude:        83°  1.9' W


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


                         BENCH MARK STAMPING:  7520 K 1978

MONUMENTATION:           Survey Disk                               VM#:      760
AGENCY:                                                            PID#:  AR1666
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is 131 feet (40 m) west of the centerline of E Street, 18.9 feet
(5.8 m) NW of the NW corner of the Southern Bell station, 16.5 feet (5.0 m) SW
of the center of a large Bell System manhole, and 4.9 feet (1.5 m) south of the
north end of a retaining wall at the Southern Bell station on the south side of
Third Street.  The bench mark is 0.5 foot (0.2 m) above the ground, crimped to a
stainless steel rod driven 36 feet (11 m) to refusal, and encased in a PVC pipe.



                         BENCH MARK STAMPING:  7520 A 1983

MONUMENTATION:           Survey Disk                               VM#:      761
AGENCY:                                                            PID#:  AR1667
SETTING CLASSIFICATION:  Concrete Sea Wall


The bench mark is set in the top of a concrete sea wall cap near the
intersection of C and Dock Streets, 47 feet (14 m) NW of the NW corner of the
restroom building near the base of Levy County Pier, 27 feet (8.2 m) south of
the centerline of Dock Street, 2.0 feet (0.6 m) west of the NW corner of the
pier, and 1.6 feet   (0.5 m) NW of the SE end of a concrete guardrail.

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

                                                   PUBLICATION DATE:  03/03/1993
Station ID: 8727520                                SUPERCEDED DATE:   04/21/2003
Name:       CEDAR KEY, GULF OF MEXICO                         
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  8.1' N
USGS Quad:  CEDAR KEY                              Longitude:        83°  1.9' W


                            T I D A L   D A T U M S 


Tidal datums at CEDAR KEY, GULF OF MEXICO based on:

     LENGTH OF SERIES:      19 YEARS
     TIME PERIOD:           1960-1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:   


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

     HIGHEST OBSERVED WATER LEVEL (06/19/1972)         =   8.14
     MEAN HIGHER HIGH WATER                     MHHW   =   3.76
     MEAN HIGH WATER                            MHW    =   3.41
   * North American Vertical Datum              NAVD88 =   2.39
     MEAN TIDE LEVEL                            MTL    =   2.02
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   1.71
     MEAN LOW WATER                             MLW    =   0.63
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (09/18/1947)         =  -4.10

   * NGVD reference based on elevations published in Quad 290832, 1992, and NOS
     leveling of 1992. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     8 1910                                      6.03      2.62
     16 1923                                     9.12      5.71
     17 1923                                    16.54     13.13
     18 1923                                     7.39      3.98
     NO 25 1953                                 10.10      6.69
     D 280                                      13.61     10.20
     D 290                                       6.89      3.48
     TANK 1933                                  25.24     21.83
     TANK NO 3 1933                             24.58     21.17
     7520 K 1978                                23.20     19.79
     7520 A 1983                                10.30      6.89


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

                                                   PUBLICATION DATE:  03/03/1993
Station ID: 8727520                                SUPERCEDED DATE:   04/21/2003
Name:       CEDAR KEY, GULF OF MEXICO                         
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  8.1' N
USGS Quad:  CEDAR KEY                              Longitude:        83°  1.9' 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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