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Bench Mark Sheet for 8726996, CROSS BAYOU, NEW PORT RICHEY 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8726996                         PUBLICATION DATE:  02/08/2005
Name:       CROSS BAYOU, NEW PORT RICHEY                      
            FL
NOAA Chart: 11409                           Latitude:   28° 14.8' N (  28.24670)
USGS Quad:  ELFERS                          Longitude:  82° 44.1' W ( -82.73500)


To reach the tidal bench marks from the intersection of West Main Street and
U.S. Highway 19 in New Port Richey, proceed west on West Main Street for 0.8 km
(0.5 mi) to the New Port Richey Water Treatment Plant.  The bench marks are at
the Water Treatment Plant and along West Main Street.  The tide gage and staff
were at the abandoned Lindrick Service Corporation water treatment plant across
Cross Bayou from the New Port Richey Water Treatment Plant.


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


                 PRIMARY BENCH MARK STAMPING:  6996 B 1976
                         DESIGNATION:          872 6996 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7696
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AL7444
SETTING CLASSIFICATION:  Concrete decking                      OPUS PID:        
LATITUDE:   28° 15.0' N (  28.25000)          LONGITUDE:  82° 43.9' W ( -82.73170)


The primary bench mark is a disk set in the concrete decking on the west side of
the blower building at the water treatment plant, north of a rectangular setting
tank and south of a circular tank, 61 m (200 ft) SE of bench mark 6996 D 1976,
3.20 m (10.5 ft) south of the NW corner of the blower building, and 2.90 m (9.5
ft) north of the SW corner of the building.

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

                                                                                
Station ID: 8726996                         PUBLICATION DATE:  02/08/2005
Name:       CROSS BAYOU, NEW PORT RICHEY                      
            FL
NOAA Chart: 11409                           Latitude:   28° 14.8' N (  28.24670)
USGS Quad:  ELFERS                          Longitude:  82° 44.1' W ( -82.73500)


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


                         BENCH MARK STAMPING:  6996 A 1976
                         DESIGNATION:          872 6996 A TIDAL

MONUMENTATION:           Survey disk                           VM#:         7695
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   28° 14.8' N (  28.24670)          LONGITUDE:  82° 44.1' W ( -82.73500)


NOTE: DESTROYED OR NOT RECOVERED ON 01/01/83.  The bench mark is a disk at the
Lindrick Service Corporation Water Treatment Plant, 11.95 m (39.2 ft) west of
the wing wall that projects from the south side of the water treatment tank and
0.79 m (2.6 ft) SE of the SW corner of the tank, and is set flush into the
concrete corner of the tank.



                         BENCH MARK STAMPING:  6996 D 1976
                         DESIGNATION:          872 6996 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7698
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AL7443
SETTING CLASSIFICATION:  Concrete tank wall                    OPUS PID:        
LATITUDE:   28° 15.0' N (  28.25000)          LONGITUDE:  82° 43.9' W ( -82.73170)


The bench mark is a disk set in the top of the west concrete wall of the second
treatment tank from the most northerly of four tanks at the water treatment
plant, 31.70 m (104.0 ft) SSE of bench mark 6996 E 1976, 12.50 m (41.0 ft) east
of the west chainlink fence, and 26.21 m (86.0 ft) SSE of the SE corner of the
garage.

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

                                                                                
Station ID: 8726996                         PUBLICATION DATE:  02/08/2005
Name:       CROSS BAYOU, NEW PORT RICHEY                      
            FL
NOAA Chart: 11409                           Latitude:   28° 14.8' N (  28.24670)
USGS Quad:  ELFERS                          Longitude:  82° 44.1' W ( -82.73500)


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


                         BENCH MARK STAMPING:  6996 E 1976
                         DESIGNATION:          872 6996 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7699
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AL7445
SETTING CLASSIFICATION:  Concrete garage deck                  OPUS PID:        
LATITUDE:   28° 15.0' N (  28.25000)          LONGITUDE:  82° 43.9' W ( -82.73170)


The bench mark is a disk set in the concrete decking at the NE corner of the
garage at the water treatment plant, 23.77 m (78.0 ft) SW of bench mark 6996 F
1976, 14.63 m (48.0 ft) west of the SW corner of the main office and control
building, 0.30 m (1.0 ft) south of the NE corner of the garage, and 0.30 m (1.0
ft) west of the east wall of the garage.



                         BENCH MARK STAMPING:  6996 F 1976
                         DESIGNATION:          872 6996 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7700
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AL7442
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   28° 15.0' N (  28.25000)          LONGITUDE:  82° 43.9' W ( -82.73170)


The bench mark is a disk located at the New Port Richey Water Treatment Plant,
19.93 m (65.4 ft) NW of the NW corner of the main office and control building,
7.62 m (25.0 ft) west of the centerline of the entrance road, and 0.30 m (1.0
ft) south of a witness post. The bench mark is crimped to the top of a
copper-clad steel rod driven an unknown depth to refusal, 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  5

                                                                                
Station ID: 8726996                         PUBLICATION DATE:  02/08/2005
Name:       CROSS BAYOU, NEW PORT RICHEY                      
            FL
NOAA Chart: 11409                           Latitude:   28° 14.8' N (  28.24670)
USGS Quad:  ELFERS                          Longitude:  82° 44.1' W ( -82.73500)


                            T I D A L   D A T U M S 


Tidal datums at CROSS BAYOU, NEW PORT RICHEY based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           March 1976 - March 1976
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8726924 ANCLOTE RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.024
     MEAN HIGH WATER                            MHW    =  0.901
     North American Vertical Datum              NAVD88 =  0.678
     MEAN SEA LEVEL                             MSL    =  0.550
     MEAN TIDE LEVEL                            MTL    =  0.535
     MEAN LOW WATER                             MLW    =  0.169
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6996 B 1976                                 2.717    1.816
     6996 A 1976                                 2.275    1.374
     6996 D 1976                                 3.282    2.381
     6996 E 1976                                 2.760    1.859
     6996 F 1976                                 2.467    1.566


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

                                                                                
Station ID: 8726996                         PUBLICATION DATE:  02/08/2005
Name:       CROSS BAYOU, NEW PORT RICHEY                      
            FL
NOAA Chart: 11409                           Latitude:   28° 14.8' N (  28.24670)
USGS Quad:  ELFERS                          Longitude:  82° 44.1' W ( -82.73500)


                             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 NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

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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Products available at 8726996 CROSS BAYOU, NEW PORT RICHEY, FL

Revised: 08/08/2018
NOAA / National Ocean Service
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