U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
Station ID: 8542425 PUBLICATION DATE: 08/11/2003
Name: WANNAMAKER BRIDGE
PA
NOAA Chart: 12312 Latitude: 39° 52.6' N ( 39.87670)
USGS Quad: LANSDOWNE Longitude: 75° 18.3' W ( -75.30500)
To reach the tidal bench marks from Philadelphia International Airport, proceed
6.0 km (3.7 mi) SW on Interstate Highway 95 to State Route 420 (Wannamaker
Avenue Exit), then proceed north on Wannamaker Avenue for 0.5 km (0.3 mi) NW to
Wannamaker Bridge over Darby Creek. The bench marks are along the east side of
Wannamaker Avenue, south of the bridge. The tide gage and staff were on the
wooden bumper piles on the NE side of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2425 A 1976
DESIGNATION: 854 2425 A
MONUMENTATION: Tidal Station disk VM#: 2907
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID#: BBDC11
LATITUDE: 39° 52.6' N ( 39.87670) LONGITUDE: 75° 18.3' W ( -75.30500)
The primary bench mark is a disk set in the NW concrete abutment of the
northbound lane of Wannamaker Bridge, 9.02 m (29.6 ft) SE of the corner of the
NE abutment, 5.24 m (17.2 ft) west of the centerline of the northbound lane, and
0.55 m (1.8 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
Station ID: 8542425 PUBLICATION DATE: 08/11/2003
Name: WANNAMAKER BRIDGE
PA
NOAA Chart: 12312 Latitude: 39° 52.6' N ( 39.87670)
USGS Quad: LANSDOWNE Longitude: 75° 18.3' W ( -75.30500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2425 B 1976
DESIGNATION: 854 2425 B
MONUMENTATION: Tidal Station disk VM#: 2908
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 39° 52.6' N ( 39.87670) LONGITUDE: 75° 18.3' W ( -75.30500)
The bench mark is a disk set along the east side of State Route 420 between
Interstate Highway 95 and Wannamaker Bridge, 102 m (336 ft) south of the south
end of the bridge, 15.00 m (49.2 ft) east of the centerline of the grass median
of State Route 420, 4 m (14 ft) west of the top of the creek bank, and 2 m (6
ft) east of a steel guard rail. The bench mark is crimped to the top of an
unspecified deep rod driven 17.1 m (56 ft), and encased in a 4-inch PVC pipe and
concrete kickblock.
BENCH MARK STAMPING:
DESIGNATION: 854 2425 NO STAMPING 1
MONUMENTATION: Survey disk VM#: 2910
AGENCY: Philadelphia Highway Department IDB PID#:
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: 39° 52.6' N ( 39.87670) LONGITUDE: 75° 18.3' W ( -75.30500)
The bench mark is a disk set in the SE concrete abutment on the northbound lane
of Wannamaker Bridge, 6.80 m (22.3 ft) east of the centerline of the northbound
lane, 5.67 m (18.6 ft) north of a metal witness post, and 1 m (2 ft) above
grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
Station ID: 8542425 PUBLICATION DATE: 08/11/2003
Name: WANNAMAKER BRIDGE
PA
NOAA Chart: 12312 Latitude: 39° 52.6' N ( 39.87670)
USGS Quad: LANSDOWNE Longitude: 75° 18.3' W ( -75.30500)
T I D A L D A T U M S
Tidal datums at WANNAMAKER BRIDGE based on:
LENGTH OF SERIES: 7 MONTHS
TIME PERIOD: May 1978 - November 1978
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 = 1.907
MEAN HIGH WATER MHW = 1.798
MEAN SEA LEVEL MSL = 0.997
MEAN TIDE LEVEL MTL = 0.929
MEAN LOW WATER MLW = 0.059
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2425 A 1976 5.955 4.157
2425 B 1976 3.395 1.597
854 2425 NO STAMPING 1 5.888 4.090
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
Station ID: 8542425 PUBLICATION DATE: 08/11/2003
Name: WANNAMAKER BRIDGE
PA
NOAA Chart: 12312 Latitude: 39° 52.6' N ( 39.87670)
USGS Quad: LANSDOWNE Longitude: 75° 18.3' W ( -75.30500)
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.