Bench Mark Sheet for 8633777, SAXIS, STARLING CREEK

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8633777                         PUBLICATION DATE:  08/11/2003
Name:       SAXIS, STARLING CREEK                             
            VA
NOAA Chart: 12228                           Latitude:   37° 55.3' N (  37.92170)
USGS Quad:  SAXIS                           Longitude:  75° 43.7' W ( -75.72830)


To reach the tidal bench marks from the post office in Saxis, proceed WSW on
State Road 695 (Saxis Road) for 1.1 km (0.7 mi) to the intersection with State
Road 817 (Harbor Road), turn left and continue SE on Harbor Road for 0.3 km (0.2
mi) to a small boat harbor.  The bench marks are along Harbor Road, at the boat
basin, and at the intersection of State Roads 695 and 817.  The tide gage and
staff were on the wooden bulkhead near the fourth finger pier from the NE,
opposite the Shore Seafood Restaurant.


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


                 PRIMARY BENCH MARK STAMPING:  3777 C 1988
                         DESIGNATION:          863 3777 C

MONUMENTATION:           Tidal Station disk                    VM#:         4869
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: BBCV66
LATITUDE:   37° 55.3' N (  37.92170)          LONGITUDE:  75° 43.7' W ( -75.72830)


The primary bench mark is a disk located between Harbor Road and the wooden
bulkhead at the first finger pier from the SW, 7.62 m (25.0 ft) SSE of the
centerline of Harbor Road, 3.96 m (13.0 ft) NNW of the bulkhead, and 1.07 m (3.5
ft) NNW of power pole #43050/76916.  The bench mark is 0.06 m (0.2 ft) below the
ground, crimped to the top of a stainless steel rod driven 12.2 m (40 ft) to
refusal, and encased in a 4-inch PVC pipe.

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

                                                                                
Station ID: 8633777                         PUBLICATION DATE:  08/11/2003
Name:       SAXIS, STARLING CREEK                             
            VA
NOAA Chart: 12228                           Latitude:   37° 55.3' N (  37.92170)
USGS Quad:  SAXIS                           Longitude:  75° 43.7' W ( -75.72830)


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


                         BENCH MARK STAMPING:  3777 A 1988
                         DESIGNATION:          863 3777 A

MONUMENTATION:           Tidal Station disk                    VM#:         4867
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   37° 55.3' N (  37.92170)          LONGITUDE:  75° 43.7' W ( -75.72830)


The bench mark is a disk set flush in the top of a concrete monument near the
fourth finger pier from the NE end of the basin, 4.97 m (16.3 ft) north of the
piling on the west side of the fourth finger pier from the NE end of the basin,
5 m (16 ft) SE of the centerline of Harbor Road, 1.07 m (3.5 ft) NW of power
pole #591J, and 0.06 m (0.2 ft) below the ground.



                         BENCH MARK STAMPING:  3777 B 1988
                         DESIGNATION:          863 3777 B

MONUMENTATION:           Tidal Station disk                    VM#:         4868
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   37° 55.3' N (  37.92170)          LONGITUDE:  75° 43.7' W ( -75.72830)


The bench mark is a disk set flush in the top of a concrete monument between
Harbor Road and the wooden bulkhead of the basin, 5.79 m (19.0 ft) SSE of the
centerline of Harbor Road, 4.18 m (13.7 ft) NNW of the bulkhead, and 0.84 m
(2.75 ft) NNW of power pole #591G/6, and 0.06 m (0.2 ft) below the ground.

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

                                                                                
Station ID: 8633777                         PUBLICATION DATE:  08/11/2003
Name:       SAXIS, STARLING CREEK                             
            VA
NOAA Chart: 12228                           Latitude:   37° 55.3' N (  37.92170)
USGS Quad:  SAXIS                           Longitude:  75° 43.7' W ( -75.72830)


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


                         BENCH MARK STAMPING:  3777 D 1988
                         DESIGNATION:          863 3777 D

MONUMENTATION:           Tidal Station disk                    VM#:         4870
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   37° 55.3' N (  37.92170)          LONGITUDE:  75° 43.7' W ( -75.72830)


The bench mark is a disk located at the intersection of Route 695 and Harbour
Road (Route 817), 6.40 m (21.0 ft) east of the centerline of Harbor Road, 3.60 m
(11.8 ft) SE of a stop sign at the intersection, and 1.52 m (5.0 ft) SSE of
power pole #76/591.  The bench mark is set 6 cm (0.2 ft) below the ground,
crimped to the top of a stainless steel rod driven 11.0 m (36 ft) to refusal,
and encased in a 4-inch PVC pipe.



                         BENCH MARK STAMPING:  3777 E 1988
                         DESIGNATION:          863 3777 E

MONUMENTATION:           Tidal Station disk                    VM#:         4871
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   37° 55.3' N (  37.92170)          LONGITUDE:  75° 43.7' W ( -75.72830)


The bench mark is a disk located along the south side of Route 695, 61 m (200
ft) NE of the intersection of Route 695 and Harbour Road (Route 817), 17 m (56
ft) north of power pole #53024/76960, 5.33 m (17.5 ft) east of the centerline of
a driveway, 3.35 m (11.0 ft) south of the south side of Route 695, and 2.74 m
(9.0 ft) SSE of power pole #589/283.  The bench mark is set 6 cm (0.2 ft) below
the ground, crimped to the top of a stainless steel rod driven 11.0 m (36 ft) to
refusal, and encased in a 4-inch PVC pipe.

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

                                                                                
Station ID: 8633777                         PUBLICATION DATE:  08/11/2003
Name:       SAXIS, STARLING CREEK                             
            VA
NOAA Chart: 12228                           Latitude:   37° 55.3' N (  37.92170)
USGS Quad:  SAXIS                           Longitude:  75° 43.7' W ( -75.72830)


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


                         BENCH MARK STAMPING:  3777 F 1988
                         DESIGNATION:          863 3777 F

MONUMENTATION:           Tidal Station disk                    VM#:         4872
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   37° 55.3' N (  37.92170)          LONGITUDE:  75° 43.7' W ( -75.72830)


The bench mark is a disk located in a grassy area near the entrance to the small
boat basin, 23.47 m (77.0 ft) south of Harbor Road, 8.44 m (27.7 ft) west of a
piling at the west end of the wooden bulkhead, and 0.91 m (3.0 ft) north of
power pole #591E/4.  The bench mark is set level with the ground, crimped to the
top of a stainless steel rod driven 13.4 m (44 ft) to refusal, and encased in a
6-inch PVC pipe.



                         BENCH MARK STAMPING:  3777 G 1988
                         DESIGNATION:          863 3777 G

MONUMENTATION:           Tidal Station disk                    VM#:         4873
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   37° 55.3' N (  37.92170)          LONGITUDE:  75° 43.7' W ( -75.72830)


The bench mark is a disk located NW of the intersection of Route 695 and Harbour
Road (Route 817), near the wooden bulkhead facing Pocomoke Sound, 13.17 m (43.2
ft) NW of power pole #42981/76966, 7.62 m (25.0 ft) ESE of the wooden bulkhead,
and 1.01 m (3.3 ft) ESE of power pole #42978/76970.  The bench mark is set level
with the ground, crimped to the top of a stainless steel rod driven 12.2 m (40
ft) to refusal, and encased in a 6-inch PVC pipe.

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

                                                                                
Station ID: 8633777                         PUBLICATION DATE:  08/11/2003
Name:       SAXIS, STARLING CREEK                             
            VA
NOAA Chart: 12228                           Latitude:   37° 55.3' N (  37.92170)
USGS Quad:  SAXIS                           Longitude:  75° 43.7' W ( -75.72830)


                            T I D A L   D A T U M S 


Tidal datums at SAXIS, STARLING CREEK based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           August 1988 - November 1988
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8632200 KIPTOPEKE, CHESAPEAKE BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.774
     MEAN HIGH WATER                            MHW    =  0.724
     MEAN TIDE LEVEL                            MTL    =  0.383
     MEAN SEA LEVEL                             MSL    =  0.381
     MEAN LOW WATER                             MLW    =  0.042
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     3777 C 1988                                 1.389    0.665
     3777 A 1988                                 1.430    0.706
     3777 B 1988                                 1.393    0.669
     3777 D 1988                                 1.442    0.718
     3777 E 1988                                 1.471    0.747
     3777 F 1988                                 1.270    0.546
     3777 G 1988                                 1.724    1.000


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

                                                                                
Station ID: 8633777                         PUBLICATION DATE:  08/11/2003
Name:       SAXIS, STARLING CREEK                             
            VA
NOAA Chart: 12228                           Latitude:   37° 55.3' N (  37.92170)
USGS Quad:  SAXIS                           Longitude:  75° 43.7' W ( -75.72830)


                             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.

Return to Top
Products available at 8633777 SAXIS, STARLING CREEK,