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Bench Mark Sheet for 8572770, Matapeake MD

Superseded Epoch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Small blue map location marker Unpublished bench mark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  9

                                                                                
Station ID: 8572770                         PUBLICATION DATE:  04/29/2003
Name:       MATAPEAKE                                         
            MD
NOAA Chart: 12270                           Latitude:   38° 57.4' N (  38.95670)
USGS Quad:  KENT ISLAND                     Longitude:  76° 21.3' W ( -76.35500)


To reach the tidal bench marks from the intersection of U.S. Highway 50 and
State Highway 8 on Kent Island, proceed south on State Highway 8 for 3.9 km (2.4
mi) to the access road for Chesapeake Bay Model, Matapeake Marine Terminal, and
the Maryland Department of Natural Resources Police facilities, turn right and
go west for 0.6 km (0.4 mi) to the police facilities area.  The bench marks are
located on the police facilities grounds, at the intersection of State Highway 8
and the access road, and at the entrance gate to Matapeake Marine Terminal.  The
tide gage and staff were located on the police facilities central pier.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1972
                         DESIGNATION:          857 2770 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:        10828
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   38° 57.4' N (  38.95670)          LONGITUDE:  76° 21.3' W ( -76.35500)


The primary bench mark is a disk set flush in a concrete seawall, in the SE
corner of the southern extension of the police facilities central pier, 13.41 m
(44.0 ft) south of the centerline of the pier, 9.54 m (31.3 ft) east of the SW
corner of the deck on the southern side of the pier, 1.37 m (4.5 ft) SW of the
most northerly chain link fence post on the southerly side of the pier, and 0.18
m (0.6 ft) above the parking lot.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  9

                                                                                
Station ID: 8572770                         PUBLICATION DATE:  04/29/2003
Name:       MATAPEAKE                                         
            MD
NOAA Chart: 12270                           Latitude:   38° 57.4' N (  38.95670)
USGS Quad:  KENT ISLAND                     Longitude:  76° 21.3' W ( -76.35500)


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


                         BENCH MARK STAMPING:  X 126 1971
                         DESIGNATION:          X 126

MONUMENTATION:           Bench Mark disk                       VM#:        10826
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  HV0185
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   38° 57.2' N (  38.95330)          LONGITUDE:  76° 20.8' W ( -76.34670)


The bench mark is a disk located at the intersection of State Highway 8 and the
access road, 32.92 m (108.0 ft) NW of the centerline of the highway, 0.61 m (2.0
ft) SW of a metal witness post and 0.3 m (1 ft) SW of pole #11 F.  The bench
mark is set level with the ground, crimped to the top of a copper-clad steel rod
driven 24.4 m (80 ft) to refusal and encased in a 6-inch metal pipe.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  9

                                                                                
Station ID: 8572770                         PUBLICATION DATE:  04/29/2003
Name:       MATAPEAKE                                         
            MD
NOAA Chart: 12270                           Latitude:   38° 57.4' N (  38.95670)
USGS Quad:  KENT ISLAND                     Longitude:  76° 21.3' W ( -76.35500)


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


                         BENCH MARK STAMPING:  Y 126 1971
                         DESIGNATION:          Y 126

MONUMENTATION:           Bench Mark disk                       VM#:        10827
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  HV0186
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   38° 57.4' N (  38.95670)          LONGITUDE:  76° 21.3' W ( -76.35500)


The bench mark is a disk located north of the police facilities area in a
clearing in the woods at the remnants of a radio tower foundation, 40.23 m
(132.0 ft) NE of a chain link fence, 6.40 m (21.0 ft) SW of the centerline of a
path, and 0.43 m (1.4 ft) NW of a metal witness post.  The bench mark is set
level with the ground, crimped to the top of a copper-clad steel rod driven 23.2
m (76 ft) to refusal and encased in a 4-inch metal pipe.



                         BENCH MARK STAMPING:  NO 2 1972
                         DESIGNATION:          857 2770 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:        10829
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Concrete step                         OPUS PID#: BBDM15
LATITUDE:   38° 57.4' N (  38.95670)          LONGITUDE:  76° 21.3' W ( -76.35500)


The bench mark is a disk set flush in the second concrete step leading from the
abandoned ferry landing to the warehouse, 13.11 m (43.0 ft) NE of the flagpole
on the police facilities grounds, 12.5 m (40.9 ft) SW of the SW curbing
surrounding police boats and the warehouse, 1.71 m (5.6 ft) SE of the most NW
point of the stairs leading to the warehouse, and 0.1 m (0.3 ft) above the
sidewalk.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  9

                                                                                
Station ID: 8572770                         PUBLICATION DATE:  04/29/2003
Name:       MATAPEAKE                                         
            MD
NOAA Chart: 12270                           Latitude:   38° 57.4' N (  38.95670)
USGS Quad:  KENT ISLAND                     Longitude:  76° 21.3' W ( -76.35500)


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


                         BENCH MARK STAMPING:  NO 3 1972
                         DESIGNATION:          857 2770 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:        10830
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Concrete culvert                      OPUS PID:        
LATITUDE:   38° 57.4' N (  38.95670)          LONGITUDE:  76° 21.3' W ( -76.35500)


The bench mark is a disk set flush in a concrete culvert that empties rain water
from the warehouse, 32.43 m (106.4 ft) east of the NW corner of the brick
warehouse, 22.34 m (73.3 ft) NE of the NE corner of the brick warehouse, 14.11 m
(46.3 ft) SW of the southerly side or edge of the parking area surrounding the
police barracks, and 0.24 m (0.8 ft) below the ground.



                         BENCH MARK STAMPING:  NO 6 1973
                         DESIGNATION:          857 2770 TIDAL 6

MONUMENTATION:           Tidal Station disk                    VM#:        10831
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:        
SETTING CLASSIFICATION:  Step                                  OPUS PID#: BBDG52
LATITUDE:   38° 57.4' N (  38.95670)          LONGITUDE:  76° 21.3' W ( -76.35500)


The bench mark is a disk set flush in the top step of the steps leading from the
headquarters to the warehouse, 31.27 m (102.6 ft) SW of the NW corner of the
warehouse, 20.27 m (66.5 ft) NW of the SW corner of the warehouse, 5.64 m (18.5
ft) NW of the flagpole, and 0.06 m (0.2 ft) below the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  9

                                                                                
Station ID: 8572770                         PUBLICATION DATE:  04/29/2003
Name:       MATAPEAKE                                         
            MD
NOAA Chart: 12270                           Latitude:   38° 57.4' N (  38.95670)
USGS Quad:  KENT ISLAND                     Longitude:  76° 21.3' W ( -76.35500)


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


                         BENCH MARK STAMPING:  2770 A 1979
                         DESIGNATION:          857 2770 A

MONUMENTATION:           Tidal Station disk                    VM#:        10832
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete pier cap                     OPUS PID:        
LATITUDE:   38° 57.4' N (  38.95670)          LONGITUDE:  76° 21.3' W ( -76.35500)


The bench mark is a disk set flush in the NW corner of the central concrete pier
section, 24.81 m (81.4 ft) west of the inshore end of pier, 4.30 m (14.1 ft)
north of the centerline of the pier, and 0.43 m (1.4 ft) NW of a lamp post.



                         BENCH MARK STAMPING:  2770 B 1979
                         DESIGNATION:          857 2770 B

MONUMENTATION:           Tidal Station disk                    VM#:        10833
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete transformer foundation       OPUS PID:        
LATITUDE:   38° 57.4' N (  38.95670)          LONGITUDE:  76° 21.3' W ( -76.35500)


The bench mark is a disk set flush in the SE corner of a 2 m x 2 m (6 ft x 6 ft)
concrete slab supporting an electric transformer at the main gate entrance to
Matapeake Marine Terminal, 6.86 m (22.5 ft) west of the centerline of the
entrance road to the police facilities, 5.64 m (18.5 ft) NW of the west gate
post, 0.3 m (1.0 ft) SE of the SE corner of the transformer, and 0.18 m (0.6 ft)
above the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  9

                                                                                
Station ID: 8572770                         PUBLICATION DATE:  04/29/2003
Name:       MATAPEAKE                                         
            MD
NOAA Chart: 12270                           Latitude:   38° 57.4' N (  38.95670)
USGS Quad:  KENT ISLAND                     Longitude:  76° 21.3' W ( -76.35500)


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


                         BENCH MARK STAMPING:   
                         DESIGNATION:          857 2270 BOLT
                         ALIAS:                NO STAMPING 1

MONUMENTATION:           Bolt                                  VM#:        10834
AGENCY:                  Unknown                               IDB PID#:        
SETTING CLASSIFICATION:  Fire hydrant                          OPUS PID:        
LATITUDE:   38° 57.4' N (  38.95670)          LONGITUDE:  76° 21.3' W ( -76.35500)


The bench mark is the top of the vertical bolt between the casting letters
ANNISTON*ALABAMA,on the east side of the top of the collar of the fire hydrant
on the north side of the police facilities parking lot, 39.35 m (129.1 ft) SE of
the SE corner of the headquarters, 18 m (59 ft) north of the most NE of westerly
median in center of the parking area for the police barracks and the
headquarters, 5.27 m (17.3 ft) NW of the centerline of the paved driveway
leading north to the DNR Police Academy wood frame building, and 0.49 m (1.6 ft)
above the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  9

                                                                                
Station ID: 8572770                         PUBLICATION DATE:  04/29/2003
Name:       MATAPEAKE                                         
            MD
NOAA Chart: 12270                           Latitude:   38° 57.4' N (  38.95670)
USGS Quad:  KENT ISLAND                     Longitude:  76° 21.3' W ( -76.35500)


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


                         BENCH MARK STAMPING:   
                         DESIGNATION:          857 2270 NUT
                         ALIAS:                NO STAMPING 2

MONUMENTATION:           See descriptive text                  VM#:        10835
AGENCY:                  Unknown                               IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   38° 57.4' N (  38.95670)          LONGITUDE:  76° 21.3' W ( -76.35500)


The bench mark is the top of the vertical nut securing the radio antenna to the
most easterly concrete foundation on the police facilities grounds, the nut is
the second one clockwise from the antenna brace, and the first nut counter
clockwise from the metal ground of the antenna support, 24.32 m (79.8 ft) SSE of
the NE corner of the DNR Police Academy building, 12 m (39.4 ft) SE of the SE
corner of the DNR Police Academy building, 1.83 m (6.0 ft) south of the north
side of a fence around transmitting tower, and 0.27 m (0.9 ft) above the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  9

                                                                                
Station ID: 8572770                         PUBLICATION DATE:  04/29/2003
Name:       MATAPEAKE                                         
            MD
NOAA Chart: 12270                           Latitude:   38° 57.4' N (  38.95670)
USGS Quad:  KENT ISLAND                     Longitude:  76° 21.3' W ( -76.35500)


                            T I D A L   D A T U M S 


Tidal datums at MATAPEAKE based on:

     LENGTH OF SERIES:      5 YEARS
     TIME PERIOD:           January 1979 - December 1983
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8574680 BALTIMORE, FORT MCHENRY, PATAPSCO RIVER


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

     HIGHEST OBSERVED WATER LEVEL (09/15/1979)         =  1.374
     MEAN HIGHER HIGH WATER                     MHHW   =  0.452
     MEAN HIGH WATER                            MHW    =  0.375
     North American Vertical Datum              NAVD88 =  0.272
     MEAN SEA LEVEL                             MSL    =  0.224
     MEAN TIDE LEVEL                            MTL    =  0.219
     MEAN LOW WATER                             MLW    =  0.063
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (04/05/1975)         = -1.101

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1972                                   2.289    1.914
     X 126 1971                                  4.761    4.386
     Y 126 1971                                  5.682    5.307
     NO 2 1972                                   2.704    2.329
     NO 3 1972                                   4.668    4.293
     NO 6 1973                                   4.881    4.506
     2770 A 1979                                 2.300    1.925
     2770 B 1979                                 6.853    6.478
     857 2270 BOLT                               4.042    3.667
     857 2270 NUT                                6.328    5.953


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

                                                                                
Station ID: 8572770                         PUBLICATION DATE:  04/29/2003
Name:       MATAPEAKE                                         
            MD
NOAA Chart: 12270                           Latitude:   38° 57.4' N (  38.95670)
USGS Quad:  KENT ISLAND                     Longitude:  76° 21.3' W ( -76.35500)


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