Superseded Bench Mark Sheet for 8571559, McCreadys Creek MD

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  09/26/2000
Station ID: 8571559                                SUPERCEDED DATE:   04/21/2003
Name:       MCCREADYS CREEK, FISHING BAY                      
            MARYLAND
NOAA Chart: 12261                                  Latitude:         38° 18.0' N
USGS Quad:  WINGATE                                Longitude:        76°  0.4' W


To reach the tidal bench marks from Salisbury, Maryland, proceed on Maryland
Route 50 for 24 km (15 mi) to Vienna, Maryland, and continue to the first
traffic light after passing over the Nanticoke River, then proceed left onto Gay
Street to the second stop sign, then left onto Linden Street, for 2 blocks, then
right onto Market Street and proceed 29.1 km (18.2 mi) to a Y in the road at the
Town of Elliot, bear left at the Y and proceed 1.1 km (0.7 mi) to the end of
road at the County Dock.  The bench marks are along the road and around the
picnic area.  The tide gage and staff were located on the wooden bulkhead.


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


                 PRIMARY BENCH MARK STAMPING:  1559 A 1981
                         DESIGNATION:          857 1559 A

MONUMENTATION:           Bench Mark disk                           VM#:     3065
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Stainless steel rod


The primary bench mark is a disk located at the McCreadys Point channel
entrance, 56.7 m (186 ft) south of the south edge of a cinder block latrine,
56.1 m (184 ft) SSW of the north end of the west bulkhead for the boat ramp,
18.11 m (59.4 ft)  west of the intersection of the north wood bulkhead for the
channel entrance and the asphalt parking lot, and 7.28 m (23.9 ft) NE of the
waters edge at the SW point near the north channel entrance bulkhead.  The bench
mark is crimped to the top of a stainless steel rod driven 20.1 m (66 ft) to
refusal.

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

                                                   PUBLICATION DATE:  09/26/2000
Station ID: 8571559                                SUPERCEDED DATE:   04/21/2003
Name:       MCCREADYS CREEK, FISHING BAY                      
            MARYLAND
NOAA Chart: 12261                                  Latitude:         38° 18.0' N
USGS Quad:  WINGATE                                Longitude:        76°  0.4' W


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


                         BENCH MARK STAMPING:  1559 B 1981
                         DESIGNATION:          857 1559 B

MONUMENTATION:           Bench Mark disk                           VM#:     3066
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Stainless steel rod


The bench mark is a disk located near the picnic area, 65.5 m (215 ft) NW of the
north end of the west bulkhead for the boat ramp, 27.52 m (90.3 ft) west of the
centerline of the road leading to McCreadys Point, 4.54 m (14.9 ft) WNW of the
NE corner of the concrete slab for the shaded picnic area, and 4.15 m (13.6 ft)
ENE of the NW corner of the concrete slab for the picnic area.  The bench mark
is crimped to the top of a stainless steel rod driven 17.1 m (56 ft) to refusal.



                         BENCH MARK STAMPING:  1559 C 1981
                         DESIGNATION:          857 1559 C

MONUMENTATION:           Bench Mark disk                           VM#:     3067
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Stainless steel rod


The bench mark is a disk located along the entrance road to McCreadys Point,
58.00 m (190.3 ft) NNW of the north end of the asphalt parking area which is
parallel to the north end of the shaded picnic area, and 4.33 m (14.2 ft) east
of the centerline of the road.  The bench mark is crimped to the top of a
stainless steel rod driven 19.2 m (63 ft) to refusal.

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

                                                   PUBLICATION DATE:  09/26/2000
Station ID: 8571559                                SUPERCEDED DATE:   04/21/2003
Name:       MCCREADYS CREEK, FISHING BAY                      
            MARYLAND
NOAA Chart: 12261                                  Latitude:         38° 18.0' N
USGS Quad:  WINGATE                                Longitude:        76°  0.4' W


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


                         BENCH MARK STAMPING:  1559 D 1981
                         DESIGNATION:          857 1559 D

MONUMENTATION:           Bench Mark disk                           VM#:     3068
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Stainless steel rod


The bench mark is a disk located along the road leading to McCreadys Point, 63.4
m (208 ft) NNW of Bench Mark 1559 C 1981 and 3.84 m (12.6 ft) east of the
centerline of the road.  The bench mark is crimped to the top of a stainless
steel rod driven 16.2 m (53 ft) to refusal.



                         BENCH MARK STAMPING:  1559 E 1981
                         DESIGNATION:          857  1559 E

MONUMENTATION:           Bench Mark disk                           VM#:     3069
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Stainless steel rod


The bench mark is a disk located along the road leading to McCreadys Point,
62.85 m (206.2 ft) NNW of Bench Mark 1559 D 1981, and 3.84 m (12.6 ft) east of
the centerline of the road.  The bench mark is crimped to the top of a stainless
steel rod driven 15.8 m (52 ft) to refusal.

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

                                                   PUBLICATION DATE:  09/26/2000
Station ID: 8571559                                SUPERCEDED DATE:   04/21/2003
Name:       MCCREADYS CREEK, FISHING BAY                      
            MARYLAND
NOAA Chart: 12261                                  Latitude:         38° 18.0' N
USGS Quad:  WINGATE                                Longitude:        76°  0.4' W


                            T I D A L   D A T U M S 


Tidal datums at MCCREADYS CREEK, FISHING BAY based on:

     LENGTH OF SERIES:      1 MONTHS
     TIME PERIOD:           FEBRUARY 1997
     TIDAL EPOCH:           1960-1978
     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   =  0.812
     MEAN HIGH WATER                            MHW    =  0.735
     MEAN TIDE LEVEL                            MTL    =  0.390
     MEAN SEA LEVEL                             MSL    =  0.387
     MEAN LOW WATER                             MLW    =  0.046
     MEAN LOWER LOW WATER                       MLLW   =  0.000



Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1559 A 1981                                 1.015    0.280
     1559 B 1981                                 1.245    0.510
     1559 C 1981                                 1.084    0.349
     1559 D 1981                                 1.082    0.347
     1559 E 1981                                 1.007    0.272


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

                                                   PUBLICATION DATE:  09/26/2000
Station ID: 8571559                                SUPERCEDED DATE:   04/21/2003
Name:       MCCREADYS CREEK, FISHING BAY                      
            MARYLAND
NOAA Chart: 12261                                  Latitude:         38° 18.0' N
USGS Quad:  WINGATE                                Longitude:        76°  0.4' 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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