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Bench Mark Sheet for 8542699, NORWOOD, DARBY CREEK PA

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8542699                         PUBLICATION DATE:  08/14/2003
Name:       NORWOOD, DARBY CREEK                              
            PA
NOAA Chart: 12312                           Latitude:   39° 52.8' N (  39.88000)
USGS Quad:  LANDSDOWNE                      Longitude:  75° 17.4' W ( -75.29000)


To reach the tidal bench marks from Philadelphia International Airport, proceed
6.0 km (3.7 mi) SW on Interstate Highway 95 to the exit for State Route 420
(Wannamaker Avenue), then exit and proceed NW on State Route 420 for 1.0 km (0.6
mi) to Chester Pike (US Route 13), then turn right on Chester Pike and proceed
NE for 1.6 km (1.0 mi) NW to Winona Avenue, then turn right and proceed SE on
Winona Avenue to a dirt access road for the Norwood Boys Club and Morton House
Historical Site, then proceed on the dirt road to an old boat ramp on Darby
Creek.  The bench marks are along the dirt road.  The tide gage and staff were
on a wooden pile platform about 8 m (25 ft) south of the north bank of Darby
Creek.


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


                 PRIMARY BENCH MARK STAMPING:  2699 D 1976
                         DESIGNATION:          854 2699 D

MONUMENTATION:           Tidal Station disk                    VM#:         2914
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   39° 52.8' N (  39.88000)          LONGITUDE:  75° 17.4' W ( -75.29000)


The primary bench mark is a disk set near the foot of the old wooden boat ramp
and bulkhead, about 46 m (150 ft) south of bench mark 2699 A 1976, 2 m (5 ft)
north of the wooden bulkhead, and 2 m (5 ft) east of the extended centerline of
the boat ramp.  The bench mark is crimped to the top of an unspecified deep rod
driven 9.8 m (32 ft) to substantial resistance, and encased in a 4-inch PVC pipe
and concrete kickblock.

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

                                                                                
Station ID: 8542699                         PUBLICATION DATE:  08/14/2003
Name:       NORWOOD, DARBY CREEK                              
            PA
NOAA Chart: 12312                           Latitude:   39° 52.8' N (  39.88000)
USGS Quad:  LANDSDOWNE                      Longitude:  75° 17.4' W ( -75.29000)


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


                         BENCH MARK STAMPING:  2699 A 1976
                         DESIGNATION:          854 2699 A

MONUMENTATION:           Tidal Station disk                    VM#:         2911
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   39° 52.8' N (  39.88000)          LONGITUDE:  75° 17.4' W ( -75.29000)


The bench mark is a disk set near Norwood Boys Club, 48 m (157 ft) north of the
old wooden boat ramp and bulkhead, and 1 m (3 ft) SW of the SW corner of the
chain link fence surrounding Norwood Boys Club.  The bench mark is set level
with the ground, crimped to the top of an unspecified deep rod driven 11.6 m (38
ft) to substantial resistance, and encased in a 4-inch PVC pipe and concrete
kickblock.



                         BENCH MARK STAMPING:  2699 B 1976
                         DESIGNATION:          854 2699 B

MONUMENTATION:           Tidal Station disk                    VM#:         2912
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   39° 52.8' N (  39.88000)          LONGITUDE:  75° 17.4' W ( -75.29000)


The bench mark is a disk set to the south of a dirt road behind Norwood Boys
Club and paralleling the north bank of Darby Creek, 66 m (217 ft) west of bench
mark 2699 A 1976, and 4.11 m (13.5 ft) SE of the centerline of the dirt road. 
The bench mark is set level with the ground, crimped to the top of an
unspecified deep rod driven 9.4 m (31 ft) to substantial resistance, and encased
in a 4-inch PVC pipe and concrete kickblock.

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

                                                                                
Station ID: 8542699                         PUBLICATION DATE:  08/14/2003
Name:       NORWOOD, DARBY CREEK                              
            PA
NOAA Chart: 12312                           Latitude:   39° 52.8' N (  39.88000)
USGS Quad:  LANDSDOWNE                      Longitude:  75° 17.4' W ( -75.29000)


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


                         BENCH MARK STAMPING:  2699 C 1976
                         DESIGNATION:          854 2699 C

MONUMENTATION:           Tidal Station disk                    VM#:         2913
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   39° 52.8' N (  39.88000)          LONGITUDE:  75° 17.4' W ( -75.29000)


The bench mark is a disk set near a small foot path leading to the rear of a
house on East Winona Drive, 66 m (215 ft) NNW of bench mark 2699 B 1976, and 2 m
(6 ft) NE of the foot path.  The bench mark is set level with the ground,
crimped to the top of an unspecified deep rod driven 10.7 m (35 ft) to
substantial resistance, and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  2699 E 1976
                         DESIGNATION:          854 2699 E

MONUMENTATION:           Tidal Station disk                    VM#:         2915
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete driveway                     OPUS PID:        
LATITUDE:   39° 52.8' N (  39.88000)          LONGITUDE:  75° 17.4' W ( -75.29000)


The bench mark is a disk set flush in the concrete driveway of the Borough of
Norwood Municpal Pumping Station between 129 and 131 Martin Lane, 18.32 m (60.1
ft) NW of the NW corner of the residence at 129 Martin Lane, 13.23 m (43.4 ft)
north of an 2 m (8 ft) high barbed wire fence surrounding the pumping station,
6.22 m (20.4 ft) south of the centerline of Martin Lane, 4.51 m (14.8 ft) west
of power pole #M-4, and 1.34 m (4.4 ft) west of the centerline of the driveway.

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

                                                                                
Station ID: 8542699                         PUBLICATION DATE:  08/14/2003
Name:       NORWOOD, DARBY CREEK                              
            PA
NOAA Chart: 12312                           Latitude:   39° 52.8' N (  39.88000)
USGS Quad:  LANDSDOWNE                      Longitude:  75° 17.4' W ( -75.29000)


                            T I D A L   D A T U M S 


Tidal datums at NORWOOD, DARBY CREEK based on:

     LENGTH OF SERIES:      5 MONTHS
     TIME PERIOD:           July 1977 - November 1977
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8545530 PHILADELPHIA (PIER 11 NORTH), DEL. RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.937
     MEAN HIGH WATER                            MHW    =  1.826
     MEAN SEA LEVEL                             MSL    =  1.011
     MEAN TIDE LEVEL                            MTL    =  0.943
     MEAN LOW WATER                             MLW    =  0.060
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2699 D 1976                                 2.339    0.513
     2699 A 1976                                 3.005    1.179
     2699 B 1976                                 3.117    1.291
     2699 C 1976                                 3.961    2.135
     2699 E 1976                                 4.740    2.914


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

                                                                                
Station ID: 8542699                         PUBLICATION DATE:  08/14/2003
Name:       NORWOOD, DARBY CREEK                              
            PA
NOAA Chart: 12312                           Latitude:   39° 52.8' N (  39.88000)
USGS Quad:  LANDSDOWNE                      Longitude:  75° 17.4' W ( -75.29000)


                             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 8542699 NORWOOD, DARBY CREEK, PA

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