Bench Mark Sheet for 8637712, Jamestown Wharf VA

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8637712                         PUBLICATION DATE:  01/04/2011
Name:       JAMESTOWN WHARF                                   
            VA
NOAA Chart: 12251                           Latitude:   37° 13.2' N (  37.22011)
USGS Quad:  SURRY                           Longitude:  76° 47.5' W ( -76.79142)


To reach from the intersection of Virginia Routes 199 and 31, go SW on Route 31
7.2 km (4.5 mi) to the Jamestown ferry loading slips in the James River to the
station straight ahead on the end of the concrete bridge and pier, on the
southwest side of a small masonry utility building.


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


                 PRIMARY BENCH MARK STAMPING:  7712 A 2010
                         DESIGNATION:          863 7712 A

MONUMENTATION:           Tidal Station disk                    VM#:        19795
AGENCY:                  US Army Corps of Engineers (USACE)    IDB PID#:        
SETTING CLASSIFICATION:  Mooring Dolphin                       OPUS PID#: BBBZ80
LATITUDE:   37° 13.2' N (  37.22006)          LONGITUDE:  76° 47.5' W ( -76.79144)


The bench mark is a disk set on a 10.3 m (33.8 ft) diamater concrete mooring
dolphin, the center of three, 17.19 m (56.4 ft) south of aluminum lamp pole 2,
17.07 m (56 ft) SW of aluminum lamp pole 3, 11.23 m (36.8 ft) south of the SW
corner of a masonry utility building and 11.15 m (36.6 ft) SW of the SE corner
of a masonry utility building.



                         BENCH MARK STAMPING:  7712 B 2010
                         DESIGNATION:          863 7712 B

MONUMENTATION:           Tidal Station disk                    VM#:        19796
AGENCY:                  US Army Corps of Engineers (USACE)    IDB PID#:        
SETTING CLASSIFICATION:  Concrete Pad                          OPUS PID:        
LATITUDE:   37° 13.4' N (  37.22372)          LONGITUDE:  76° 47.3' W ( -76.78797)


The bench mark is a disk set in the south corner of a concrete base for a pole
mounted video camara, 19.23 m (63.1 ft) NE of power pole BL34, 17.54 m (57.5 ft)
NE of the center of the NE face of a concrete culvert bulkhead, and 8.53 m (28
ft) NW of the centerline of Virginia Route 31.

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

                                                                                
Station ID: 8637712                         PUBLICATION DATE:  01/04/2011
Name:       JAMESTOWN WHARF                                   
            VA
NOAA Chart: 12251                           Latitude:   37° 13.2' N (  37.22011)
USGS Quad:  SURRY                           Longitude:  76° 47.5' W ( -76.79142)


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


                         BENCH MARK STAMPING:  7712 C 2010
                         DESIGNATION:          863 7712 C

MONUMENTATION:           Tidal Station disk                    VM#:        19797
AGENCY:                  US Army Corps of Engineers (USACE)    IDB PID#:        
SETTING CLASSIFICATION:  Concrete Pad                          OPUS PID:        
LATITUDE:   37° 13.5' N (  37.22528)          LONGITUDE:  76° 47.2' W ( -76.78628)


The bench mark is a disk set in the south corner of a concrete pad holding
switchgear for ferry electronic info sign, 59.48 m (195.1 ft) NE of power pole
CM80, 11.01 m (36.1 ft) NW of the centerline of Virginia Route 31, 3.40 m (11.2
ft) SE of the power pole 4, and 2.71 m (8.9 ft) WNW of the SE leg of eletronic
sign.



                         BENCH MARK STAMPING:  7712 D 2010
                         DESIGNATION:          863 7712 D

MONUMENTATION:           Tidal Station disk                    VM#:        19798
AGENCY:                  US Army Corps of Engineers (USACE)    IDB PID#:        
SETTING CLASSIFICATION:  Concrete Pad                          OPUS PID#: BBDL21
LATITUDE:   37° 13.6' N (  37.22700)          LONGITUDE:  76° 47.0' W ( -76.78415)


The bech mark is a disk set in the west corner of a concrete pad for a manhole
structure, 44 m (144.4 ft) NE of power pole DN03, 17.24 m (56.6 ft) SE of a 0.91
m (3 ft) pine tree, and 7.36 m (24.1 ft) NW of the centerline of Virginia Route
31.

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

                                                                                
Station ID: 8637712                         PUBLICATION DATE:  01/04/2011
Name:       JAMESTOWN WHARF                                   
            VA
NOAA Chart: 12251                           Latitude:   37° 13.2' N (  37.22011)
USGS Quad:  SURRY                           Longitude:  76° 47.5' W ( -76.79142)


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


                         BENCH MARK STAMPING:  7712 E 2010
                         DESIGNATION:          863 7712 E

MONUMENTATION:           Tidal Station disk                    VM#:        19799
AGENCY:                  US Army Corps of Engineers (USACE)    IDB PID#:        
SETTING CLASSIFICATION:  Concrete curb                         OPUS PID:        
LATITUDE:   37° 13.6' N (  37.22742)          LONGITUDE:  76° 48.0' W ( -76.79988)


The bench mark is a disk set in the east corner of a prefabricated concrete curb
drainage inlet structure with manhole top, 45.07 m (147.9 ft) WSW of the NW end
of the Jamestown settlement main entrance sign, 19.21 m (63 ft) NE of a 0.71 m
(2.3 ft) diameter pine tree, 7.90 m (25.9 ft) SE of the centerline of Virginia
Route 31, and 0.64 m (2.1 ft) SE of the back of the concrete curb.

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

                                                                                
Station ID: 8637712                         PUBLICATION DATE:  01/04/2011
Name:       JAMESTOWN WHARF                                   
            VA
NOAA Chart: 12251                           Latitude:   37° 13.2' N (  37.22011)
USGS Quad:  SURRY                           Longitude:  76° 47.5' W ( -76.79142)


                            T I D A L   D A T U M S 


Tidal datums at JAMESTOWN WHARF based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           August 2010 - September 2010
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8638610 SEWELLS POINT, HAMPTON ROADS


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.656
     MEAN HIGH WATER                            MHW    =  0.604
     MEAN SEA LEVEL                             MSL    =  0.331
     MEAN TIDE LEVEL                            MTL    =  0.328
     MEAN LOW WATER                             MLW    =  0.051
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7712 A 2010                                 3.868    3.264
     7712 B 2010                                 2.497    1.893
     7712 C 2010                                 4.624    4.020
     7712 D 2010                                 7.544    6.940
     7712 E 2010                                 7.820    7.216


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

                                                                                
Station ID: 8637712                         PUBLICATION DATE:  01/04/2011
Name:       JAMESTOWN WHARF                                   
            VA
NOAA Chart: 12251                           Latitude:   37° 13.2' N (  37.22011)
USGS Quad:  SURRY                           Longitude:  76° 47.5' W ( -76.79142)


                             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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