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Bench Mark Sheet for 8636580, Windmill Point 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Superseded Epoch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Small blue map location marker Unpublished bench mark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 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


To reach the tidal bench marks from the town of Whitestone, Virginia, in white
stone from intersection of 3 (Rappahannock Drive) and Chesapeake Drive (VA 695)
go 12.1 km (7.5 mi) east (left) on Chesapeake Drive, go east (left) on
Windjammer Ln for 0.8 km (0.5 mi) located at 648 Windjammer Ln, at the dead end
of road.


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


                 PRIMARY BENCH MARK STAMPING:  6580 E 2011
                         DESIGNATION:          863 6580 E

MONUMENTATION:           Flange-encased Rod                    VM#:        20258
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Deep rod                              OPUS PID#: BBDN60
LATITUDE:   37° 36.9' N (  37.61558)          LONGITUDE:  76° 17.3' W ( -76.28772)


The bench mark is a flange-encased rod set 34.70 m (113.8 ft) west of condos at
121 building at the NW corner, 24.60 m (80.7 ft) east of the NE corner for the
condo, 14.04 m (46.1 ft) south of the SW corner of a wood sided building for
condo's water treatment, and 0.49 m (1.6 ft) north of a witness post, set flush
with the ground next to a sand barer fence that runs east and west between the
condos.  The datum point being the top of a stainless steel rod driven 26.8 m
(87.9 ft) to refusal, and encased in a 5-inch PVC pipe in concrete with a NOS
logo cap set flush with the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


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


                         BENCH MARK STAMPING:  6580 B 1982
                         DESIGNATION:          863 6580 B

MONUMENTATION:           Tidal Station disk                    VM#:        11256
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   37° 37.0' N (  37.61639)          LONGITUDE:  76° 17.6' W ( -76.29350)


The bench mark is a disk located in The Landing townhouse development at the
Windmill Point Marina, 36.6 m (120 ft) NE of the northeasternmost corner of a
row of wood siding townhouses, 21.24 m (69.7 ft) NNW of the centerline of County
Route 695, and 6.71 m (22.0 ft) NW of telephone pole numbered XJ41.  The bench
mark is 0.09 m (0.3 ft) below ground, crimped to an unspecified rod driven 16.5
m (54 ft) to refusal, and encased in a PVC pipe extending 0.09 m (0.3 ft) above
ground.



                         BENCH MARK STAMPING:  6580 G 2011
                         DESIGNATION:          863 6580 G

MONUMENTATION:           Flange-encased Rod                    VM#:        20260
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   37° 37.0' N (  37.61719)          LONGITUDE:  76° 17.4' W ( -76.28978)


The bench mark is a flange-encase rod located 8.00 m (26.2 ft) north of the
center line of Windjammer Ln, 7.00 m (23.0 ft) NW of the center line of two
steel gates leading to a retention pond and sewage pumping station on the north
side of Windjammer Ln, and 6.30 m (20.7 ft) south from a power pole F141 on the
north side of Windjammer Ln.  The datum point being the top of a stainless steel
rod driven to refusal, and encased in a 5 inch (13 cm) PVC pipe in concrete with
a NOS logo cap set flush with the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


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


                         BENCH MARK STAMPING:  6580 J 2011
                         DESIGNATION:          863 6580 J

MONUMENTATION:           Flange-encased Rod                    VM#:        20262
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: BBDN98
LATITUDE:   37° 37.1' N (  37.61767)          LONGITUDE:  76° 17.5' W ( -76.29247)


The bench mark is a flange-encased rod located on the south side of Windjammer
Ln at the Windmill Point Marina, 31.47 m (103.2 ft) east of the NE corner of
6809 Landing Townhouse development residence, 27.36 m (89.8 ft) east of a power
pole 631F-258 which is located on the east side of VA-695 (Chesapeake Ln), 13.50
m (44.3 ft) north of the center line of graveled section of Windjammer Ln, 12.14
m (39.8 ft) WSW of a phone pedestal 21-95) located on the west side of
Chesapeake Ln and south of graveled section of Windjammer Ln leading to a water
pumping station, and 3.98 m (13.1 ft) SE of a NOAA witness post that is next to
a power pole 631F252.  The datum point being the top of a stainless steel rod
driven to refusal, and encased in a 5 inch (13 cm) PVC pipe 0.12 m (0.4 ft)
below ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


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


                         BENCH MARK STAMPING:  X 459 1971
                         DESIGNATION:          X 459

MONUMENTATION:           Bench Mark disk                       VM#:        20263
AGENCY:                  CO-OPS                                IDB PID#:        
SETTING CLASSIFICATION:  Copper coated rod                     OPUS PID:        
LATITUDE:   37° 38.0' N (  37.63297)          LONGITUDE:  76° 18.5' W ( -76.30867)


The bench mark is located 8.7 km (5.4 mi) SE from White Stone, 8.6 km (5.35 mi)
SE along county road 695 (Chesapeake Ln) from the junction of state Highway 3
and 695 (Chesapeake Ln) at White Stone, 0.6 km (0.35 mi) NE of the Methodist
church at Foxwells, 7.6 m (25 ft) NW of the center line of the road, 0.3 m (1.0
ft) SW of power pole number 39, 0.21 cm (0 inch) NE of a metal witness post,
level with the road and on top of a 4-foot section of copper coated rod that is
attached to a metal base plate, 8 cm (3 inches) below the surface of the ground
and is protected by a 4-inch (10 cm) Orangeburg pipe that is level with the
ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


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


                         BENCH MARK STAMPING:  W 459 1971
                         DESIGNATION:          W 459

MONUMENTATION:           Bench Mark disk                       VM#:        20264
AGENCY:                  CO-OPS                                IDB PID#:        
SETTING CLASSIFICATION:  Copper coated rod                     OPUS PID:        
LATITUDE:   37° 37.9' N (  37.63131)          LONGITUDE:  76° 17.5' W ( -76.29228)


The bench mark is located 10.3 km (6.4 mi) SE from White Stone, 10.2 km (6.35
mi) SE along county road (Chesapeake Ln) from the junction of state Highway 3
and Chesapeake Ln at White Stone, 11.0 m (36 ft) east of the center line of the
road, 6.1 m (20 ft) south of the center line of the driveway to Bay View, 7.9 m
(26 ft) SSW of the more southerly brace pole for a gate, 6.1 m (20 ft) north of
a 61 cm (24-inch) tree, 0.5 m (1.7 ft) west of a metal witness post, level with
the road and on top of a 4-foot section of copper coated rod that is attached to
a metal base plate, 3 inches (8 cm) below the surface of the ground and is
protected by a 10 cm (4 inch) Orangeburg pipe that is level with the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


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


                         BENCH MARK STAMPING:  H 272 1942
                         DESIGNATION:          H 272

MONUMENTATION:           Bench Mark disk                       VM#:        20265
AGENCY:                                                        IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   37° 37.8' N (  37.62922)          LONGITUDE:  76° 18.8' W ( -76.31303)


The bench mark is a disc set in concrete monument 9.75 m (32 ft) northeast of
the northeast corner of the Methodist Church, 13.41 m (44 ft) northwest of the
center line of the road State Route 695, 3.04 m (10 ft) northwest of power pole
number 48420, .33 m (1.1 ft) southwest of a metal witness post, level with the
county road and set in the top of a concrete post which projects 12.70 cm (5
in).



                         BENCH MARK STAMPING:  6580 L 2015
                         DESIGNATION:          863 6580 L

MONUMENTATION:           Tidal Station disk                    VM#:        21636
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Foundation of medium sized build      OPUS PID:        
LATITUDE:   37° 37.0' N (  37.61608)          LONGITUDE:  76° 17.5' W ( -76.29214)


The bench mark is set flush in the top of a massive concrete pad on the NW
foundation of the Windmill Point Marina main building, 45.7 m (149.9 ft) east of
the fire hydrant in the westernmost gravel parking lot within the facility, 14.6
m (47.9 ft) SW of the second green lamp post from the western edge along the
southern marina bulkhead, and 4.3 m (14.1 ft) west of the double doors on the NW
side of the main marina building.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


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


                         BENCH MARK STAMPING:  6580 M 2016
                         DESIGNATION:          863 6580 M

MONUMENTATION:           Bench Mark disk                       VM#:        21917
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   37° 37.0' N (  37.61636)          LONGITUDE:  76° 17.5' W ( -76.29142)


The bench mark is a brass disc set atop the north corner of a concrete pad
holding power distribution boxes on the north side of the basin north of the
clubhouse, 12.4 m (40.7 ft) north of the landing to the ramp of a floating dock
located along the bulkhead, 7.6 m (24.9 ft) NNE of the SSW face of the bulkhead,
and 3.45 m (11.3 ft) south of the east corner of a concrete pad holding
electrical transformers.



                         BENCH MARK STAMPING:  6580 N 2016
                         DESIGNATION:          863 6580 N

MONUMENTATION:           Bench Mark disk                       VM#:        21972
AGENCY:                  NOS                                   IDB PID#:        
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   37° 36.9' N (  37.61564)          LONGITUDE:  76° 17.5' W ( -76.29139)


The bench mark is a brass disc set in the SE corner of a concrete pad holding
power distribution boxes east of the clubhouse located 17.6 m (57.7 ft) SSW of
the SE corner of a concrete pad holding electrical transformers, 6.4 m (21.0 ft)
SE of the east corner of the shallow end of the pool, and 1.1 m (3.6 ft) NW of
the curve in the retaining wall east of the power distribution boxes.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


                            T I D A L   D A T U M S 


Tidal datums at WINDMILL POINT, RAPPAHANNOCK RIVER based on:

     LENGTH OF SERIES:      5 YEARS
     TIME PERIOD:           June 2012 - May 2017
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8635750 LEWISETTA, POTOMAC RIVER


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

     HIGHEST OBSERVED WATER LEVEL (09/01/2006)         =  1.574
     MEAN HIGHER HIGH WATER                     MHHW   =  0.424
     MEAN HIGH WATER                            MHW    =  0.383
     North American Vertical Datum              NAVD88 =  0.344
     MEAN SEA LEVEL                             MSL    =  0.212
     MEAN TIDE LEVEL                            MTL    =  0.206
     MEAN LOW WATER                             MLW    =  0.030
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/07/2018)         = -0.625

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6580 E 2011                                 1.510    1.127
     6580 B 1982                                 1.163    0.780
     6580 G 2011                                 1.289    0.906
     6580 J 2011                                 1.380    0.997
     X 459 1971                                  0.919    0.536
     W 459 1971                                  1.369    0.986
     H 272 1942                                  1.416    1.033
     6580 L 2015                                 1.792    1.409
     6580 M 2016                                 1.873    1.490
     6580 N 2016                                 2.406    2.023


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  9 of 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


Foot Notes:

Bench marks 6580 M 2016, H 272 1942, W 459 1971 and X 459 1971 are based on one
differential leveling connection and do not meet the quality control standards
of the NOS. Therefore, caution should be used when deriving elevations for these
marks.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page 10 of 10

                                                                                
Station ID: 8636580                         PUBLICATION DATE:  04/27/2018
Name:       WINDMILL POINT, RAPPAHANNOCK RIVER                
            VA
NOAA Chart: 12235                           Latitude:   37° 37.0' N (  37.61611)
USGS Quad:  DELTAVILLE                      Longitude:  76° 17.4' W ( -76.29000)


                             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 8636580 Windmill Point, VA

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services