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Bench Mark Sheet for 8727520, Cedar Key FL

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

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

                                                                                
Station ID: 8727520                                PUBLICATION DATE:  05/27/2003
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 0.03 km (0.2 mi) 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
                         DESIGNATION:          TIDAL STA 3-60 TIDAL 8
                         ALIAS:                8 1910

MONUMENTATION:           Triangulation Station disk                VM#:      751
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  AR1204
SETTING CLASSIFICATION:  Concrete post


The primary bench mark is a disk set in the top of a concrete-filled terra cotta
pipe, about one-half block NW along C Street from its intersection with Second
Street, 16.31 m (53.5 ft) NE of the center line of C Street, 6.83 m (22.4 ft) NW
of the north corner of the SW portion of a large apartment building, 1.07 m (3.5
ft) SW of the SW edge of a concrete wall which is 0.61 m (2.0 ft) high, 0.3 m (1
ft) below the level of the street, and 0.06 m (0.2 ft) below ground level.



                         BENCH MARK STAMPING:  17 1923
                         DESIGNATION:          872 7520 TIDAL 17

MONUMENTATION:           Tidal Station disk                        VM#:      753
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  AR1203
SETTING CLASSIFICATION:  Foundation


The bench mark is a disk set set vertically in the SW face of the south corner
of Island Hotel (a two-storied pink stucco building) at the north corner of B
and Second Streets, 5 m (16 ft) NW of the NW curb of Second  Street, 0.76 m (2.5
ft) NW of the south corner of the building, and 1.22 m (4.0 ft) above the level
of the street.

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

                                                                                
Station ID: 8727520                                PUBLICATION DATE:  05/27/2003
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:  18 1923
                         DESIGNATION:          872 7520 TIDAL 18

MONUMENTATION:           Tidal Station disk                        VM#:      754
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  AR1211
SETTING CLASSIFICATION:  Sidewalk


The bench mark is a disk set on top of an old sidewalk which is partly covered
with dirt, in the south corner of the intersection of C and Second Streets, 9.30
m (30.5 ft) SW of the centerline of C Street, 3.02 m (9.9 ft) SE of the SE curb
of Second Street, 4 m (12 ft) north of the north corner of a small white house,
about level with the street and 0.06 m (0.2 ft) underground.



                         BENCH MARK STAMPING:  D 280
                         DESIGNATION:          D 280

MONUMENTATION:           Survey disk                               VM#:      756
AGENCY:                  Florida State Road Department (FLSRD)     PID#:  AR1210
SETTING CLASSIFICATION:  Bridge curb


The bench mark is a disk set on the top of the concrete guard rail base along
the SW side of the C Street bridge near the city pier, directly over the SW end
of the NW one of two piers, 30.54 m (100.2 ft) SE of the NW end of the bridge,
0.18 m ( 0.6 ft) SW of the SW bridge curb, and 0.3 m (1 ft) above the bridge
floor.

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

                                                                                
Station ID: 8727520                                PUBLICATION DATE:  05/27/2003
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
                         DESIGNATION:          D 290

MONUMENTATION:           Survey disk                               VM#:      757
AGENCY:                  Florida State Road Department (FLSRD)     PID#:  AR1665
SETTING CLASSIFICATION:  Concrete sea wall


The bench mark is a disk located along First Street between B Street and C
Street, 27 m (89 ft) south of the centerline of First Street, and 0.15 m (0.5
ft) east of the west end of the seawall along the north side of a tidal basin.



                         BENCH MARK STAMPING:  7520 K 1978
                         DESIGNATION:          872 7520 K TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:      760
AGENCY:                  National Ocean Survey (NOS)               PID#:  AR1666
SETTING CLASSIFICATION:  Stainless steel rod


The bench mark is a disk near the interseciton of Third and E Streets, 40 m (131
ft) west of the centerline of E Street, 5.76 m (18.9 ft) NNW of the NW corner of
the Southern Bell Telephone Company Building, 5.03 m (16.5 ft) SW of a manhole
cover, and 1.49 m (4.9 ft) south of the north end of a retaining wall.  The
bench mark is 5 cm (0.2 ft) above ground level, crimped to a stainless steel rod
driven 11.0 m (36 ft) to refusal (no PVC kickblock).

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

                                                                                
Station ID: 8727520                                PUBLICATION DATE:  05/27/2003
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 A 1983
                         DESIGNATION:          872 7520 A TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:      761
AGENCY:                  National Ocean Service (NOS)              PID#:  AR1667
SETTING CLASSIFICATION:  Sidewalk


The bench mark is a disk set in the concrete sidewalk atop a seawall, near the
intersection of C and Dock Streets at the foot of the city pier, 5.10 (16.7 ft)
SE from the junction of where the centerlines meet at the end of the two
streets, 0.60 m (2.0 ft) west of the NW corner of the city pier, 0.50 m (1.6 ft)
NW of the SE end of the guardrail.   NOTE:  Difficult tripod set-up, not much
room, lots of people traffic and parking is a premium.

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

                                                                                
Station ID: 8727520                                PUBLICATION DATE:  05/27/2003
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:      16 YEARS
     TIME PERIOD:           1/1983-12/1987 ; 1/1989-12/1994 ; 1/1997-12/2001
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8726520 ST. PETERSBURG, TAMPA BAY


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

     HIGHEST OBSERVED WATER LEVEL (10/07/1996)         =  2.727
     MEAN HIGHER HIGH WATER                     MHHW   =  1.158
     MEAN HIGH WATER                            MHW    =  1.055
     North American Vertical Datum              NAVD88 =  0.687
     MEAN TIDE LEVEL                            MTL    =  0.624
     MEAN SEA LEVEL                             MSL    =  0.621
     MEAN LOW WATER                             MLW    =  0.193
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (09/18/1947)         = -1.282

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     8                                           1.797    0.742
     17 1923                                     4.998    3.943
     18 1923                                     2.208    1.153
     D 280                                       4.108    3.053
     D 290                                       2.059    1.005
     7520 K 1978                                 7.032    5.976
     7520 A 1983                                 3.098    2.042


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

                                                                                
Station ID: 8727520                                PUBLICATION DATE:  05/27/2003
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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Revised: 10/15/2013
NOAA / National Ocean Service
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