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Bench Mark Sheet for 8579542, Lower Marlboro 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8579542                         PUBLICATION DATE:  06/18/2010
Name:       LOWER MARLBORO, PATUXENT RIVER                    
            MD
NOAA Chart: 12289                           Latitude:   38° 39.3' N (  38.65500)
USGS Quad:  LOWER MARLBORO                  Longitude:  76° 41.0' W ( -76.68333)


To reach the tidal bench marks from the intersection of MD-4 and MD-262, follow
Lower Marlboro Road (MD-262) east 7.1 km (4.4 mi) to the County Pier on the
Patuxent River.  The gauge was located in the NW corner of the pier and the
bench marks are along Lower Marlboro Lane and MD-262.


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


                 PRIMARY BENCH MARK STAMPING:  NO 5 1973
                         DESIGNATION:          857 9542 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:        17821
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete cover of drain               OPUS PID:        
LATITUDE:   38° 39.3' N (  38.65500)          LONGITUDE:  76° 40.9' W ( -76.68170)


The primary bench mark is a disk set flush in a concrete block cover over a
drainage ditch in the SW corner of the intersection of state highway 262 and
Lower Marlboro Lane, 11.25 m (36.9 ft) west of power pole number 124,  5.00 m
(16.4 ft) west of the centerline of Lower Marlboro Lane, and 4.30 m (14.1 ft)
south of the centerline of state highway 262.

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

                                                                                
Station ID: 8579542                         PUBLICATION DATE:  06/18/2010
Name:       LOWER MARLBORO, PATUXENT RIVER                    
            MD
NOAA Chart: 12289                           Latitude:   38° 39.3' N (  38.65500)
USGS Quad:  LOWER MARLBORO                  Longitude:  76° 41.0' W ( -76.68333)


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


                         BENCH MARK STAMPING:  NO 4 1973
                         DESIGNATION:          857 9542 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:        17822
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete retaining wall               OPUS PID:        
LATITUDE:   38° 39.4' N (  38.65670)          LONGITUDE:  76° 40.9' W ( -76.68170)


The bench mark is a disk set flush in the top of a concrete retaining wall in
the NW corner of the intersection of State Highway 262 and Lower Marlboro Lane,
5.70 m (18.7 ft) east of the SE corner of a restored house, 4.39 m (14.4 ft)
west of the centerline of Lower Marlboro Lane, 4.30 m (14.1 ft) north of the
centerline of State Highway 262, 1.31 m (4.3 ft) from the end of the retaining
wall, and 0.79 m (2.6 ft) above ground level.  



                         BENCH MARK STAMPING:  NO 2 1972
                         DESIGNATION:          857 9542 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:        17823
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete step                         OPUS PID:        
LATITUDE:   38° 39.4' N (  38.65670)          LONGITUDE:  76° 40.9' W ( -76.68170)


The bench mark is a disk set flush in the first step of a private residence,
26.49 m (86.9 ft) NE of the intersection of State Highway 262 and Lower Marlboro
Lane, and 19.20 m (63.0 ft) north of the centerline of State Highway 262.  

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

                                                                                
Station ID: 8579542                         PUBLICATION DATE:  06/18/2010
Name:       LOWER MARLBORO, PATUXENT RIVER                    
            MD
NOAA Chart: 12289                           Latitude:   38° 39.3' N (  38.65500)
USGS Quad:  LOWER MARLBORO                  Longitude:  76° 41.0' W ( -76.68333)


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


                         BENCH MARK STAMPING:  NO 3 1972
                         DESIGNATION:          857 9542 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:        17824
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete step                         OPUS PID:        
LATITUDE:   38° 39.3' N (  38.65500)          LONGITUDE:  76° 40.9' W ( -76.68170)


The bench mark is a disk set flush in the first concrete step of a church, and
32.00 m (105.0 ft) east of the center line of Lower Marlboro Lane.  



                         BENCH MARK STAMPING:  9542 A 2005
                         DESIGNATION:          857 9542 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        17831
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete step                         OPUS PID:        
LATITUDE:   38° 39.3' N (  38.65500)          LONGITUDE:  76° 40.9' W ( -76.68170)


The bench mark is set flush in the second stair leading to the front door of
6523 Lower Marlboro Lane, 20.76 m (68.1 ft) east of the centerline of Lower
Marlboro Lane, 7.77 m (25.5 ft) from the centerline of the driveway of 6523
Lower Marlboro Lane, 1.19 m (3.9 ft) from the door frame, and 0.31 m (1.0 ft)
above ground.

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

                                                                                
Station ID: 8579542                         PUBLICATION DATE:  06/18/2010
Name:       LOWER MARLBORO, PATUXENT RIVER                    
            MD
NOAA Chart: 12289                           Latitude:   38° 39.3' N (  38.65500)
USGS Quad:  LOWER MARLBORO                  Longitude:  76° 41.0' W ( -76.68333)


                            T I D A L   D A T U M S 


Tidal datums at LOWER MARLBORO, PATUXENT RIVER based on:

     LENGTH OF SERIES:      3 YEARS
     TIME PERIOD:           May 2005 - April 2008
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8571892 CAMBRIDGE, CHOPTANK RIVER


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

     HIGHEST OBSERVED WATER LEVEL (09/02/2006)         =  1.484
     MEAN HIGHER HIGH WATER                     MHHW   =  0.651
     MEAN HIGH WATER                            MHW    =  0.609
     MEAN SEA LEVEL                             MSL    =  0.341
     MEAN TIDE LEVEL                            MTL    =  0.331
     MEAN LOW WATER                             MLW    =  0.053
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/03/2010)         = -0.809

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 5 1973                                   7.444    6.835
     NO 4 1973                                   7.825    7.216
     NO 2 1972                                   9.080    8.471
     NO 3 1972                                  10.271    9.662
     9542 A 2005                                 9.761    9.152


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

                                                                                
Station ID: 8579542                         PUBLICATION DATE:  06/18/2010
Name:       LOWER MARLBORO, PATUXENT RIVER                    
            MD
NOAA Chart: 12289                           Latitude:   38° 39.3' N (  38.65500)
USGS Quad:  LOWER MARLBORO                  Longitude:  76° 41.0' W ( -76.68333)


                             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 8579542 Lower Marlboro, MD

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