U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 7
Station ID: 9076070 PUBLICATION DATE: 08/11/2017
Name: S.W. PIER, ST. MARYS RIVER
MI
NOAA Chart: 14884 Latitude: 46° 30.1' N ( 46.50111)
USGS Quad: Longitude: 84° 22.4' W ( -84.37261)
IN SAULT STE MARIE, CHIPPEWA COUNTY, MICHIGAN. FROM THE INTERSECTION OF PORTAGE
AVE AND WEST PIER DR, PROCEED WEST ON WEST PIER DR, A DIRT AND GRAVEL RD RUNNING
PARALLEL TO THE COE SECURTIY FENCE RUNNING EAST AND WEST ALONG CANAL, FOR APPROX
0.48 MILES (0.77 KM) , ON THE NORTH SIDE OF WEST PIER, ON THE CORPS OF ENGINEERS
PROPERTY, NEAR THE ENTRANCE TO THE POWER CANAL, AT THE DOWNSTREAM END OF THE
SOUTHWEST PIER EXTENSION TO THE NOS WATER LEVEL GAUGING STATION
G R E A T L A K E S B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9076070 PUBLICATION DATE: 08/11/2017
Name: S.W. PIER, ST. MARYS RIVER
MI
NOAA Chart: 14884 Latitude: 46° 30.1' N ( 46.50111)
USGS Quad: Longitude: 84° 22.4' W ( -84.37261)
G R E A T L A K E S B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: V 295 1983
DESIGNATION: V 295
MONUMENTATION: Bench Mark disk VM#: 13179
AGENCY: National Geodetic Survey IDB PID#: RJ0608
SETTING CLASSIFICATION: Bridge pier OPUS PID:
LATITUDE: 46° 30.1' N ( 46.50142) LONGITUDE: 84° 21.8' W ( -84.36383)
The bench mark is a disk set vertically in a massive rectangular shaped single
concrete pier supporting the international bridge, in the West face and at the
NW corner of the pier, just East of a railroad overpass, 0.6 km (0.35 mi) West
along West Portage Avenue from the T-junction of magazine street to the mark on
the left, 8.84 meters (29.00 ft) South of the centerline of West Portage Avenue,
0.94 meters (3.08 ft) above the ground, and 0.30 meters (0.98 ft) S of the NW
face of the pier.
BENCH MARK STAMPING:
DESIGNATION: 907 6070 SW PIER
MONUMENTATION: Not specified (see descriptive text) VM#: 13180
AGENCY: IDB PID#: RJ0031
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 46° 30.1' N ( 46.50136) LONGITUDE: 84° 22.4' W ( -84.37253)
The bench mark is the highest point over small brass plate on end of arm welded
to a pipe set into bedrock in the NW corner of the stilling well inside the NOAA
gauge house.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9076070 PUBLICATION DATE: 08/11/2017
Name: S.W. PIER, ST. MARYS RIVER
MI
NOAA Chart: 14884 Latitude: 46° 30.1' N ( 46.50111)
USGS Quad: Longitude: 84° 22.4' W ( -84.37261)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: IBM 37
MONUMENTATION: See descriptive text VM#: 13181
AGENCY: International boundary comission IDB PID#: RJ0609
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 46° 30.1' N ( 46.50125) LONGITUDE: 84° 22.4' W ( -84.37261)
The bench mark is the top of a brass plug set in top of a round concrete
international boundary reference monument no. 37 near water level gage house,
26.7m (87.6 ft) West of the SW corner of lock observers house, 14.5m (47.6 ft)
South of North edge of South seawall of South canal, 8.8m (28.9 ft) South of
mooring post number 1868 W, and 1.0m (3.3 ft) North of a chain link fence.
Protruding approx 2.5 ft (0.8 m) above the ground surface.
BENCH MARK STAMPING: 788 W RCH 1946 FWT
DESIGNATION: 907 6070 788 W
MONUMENTATION: Bench Mark disk VM#: 13182
AGENCY: US Lake Survey IDB PID#: RJ0030
SETTING CLASSIFICATION: Seawall OPUS PID:
LATITUDE: 46° 30.1' N ( 46.50153) LONGITUDE: 84° 22.1' W ( -84.36914)
The bench mark is a disk above the locks on South seawall of the South canal on
property of the U.S. Corps of Engineers, about 366.0m (1200.8 ft) upstream from
the international highway bridge over the canals leading to Canada, 335.0m
(1099.1 ft) upstream from the railroad bridge over the canals, 13.75m (45.11 ft)
North of the COE security fence, 4.0m (13.1 ft) North of mooring post number
788W, 1.5m (4.9 ft) South of the North face of the South seawall of South canal.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9076070 PUBLICATION DATE: 08/11/2017
Name: S.W. PIER, ST. MARYS RIVER
MI
NOAA Chart: 14884 Latitude: 46° 30.1' N ( 46.50111)
USGS Quad: Longitude: 84° 22.4' W ( -84.37261)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 907 6070 Q
MONUMENTATION: Bench Mark disk VM#: 13183
AGENCY: US Engineers IDB PID#: RJ0029
SETTING CLASSIFICATION: Concrete seawall OPUS PID:
LATITUDE: 46° 30.1' N ( 46.50183) LONGITUDE: 84° 21.8' W ( -84.36383)
The bench mark is a disk set in top of the South concrete seawall of the South
canal, 11.1 meters (36.4 ft) East of the NE corner of the South bridge abutment
of railroad bridge, 6.30 meters (20.67 ft) North of the COE security fence, 0.9
meter (3.0 ft) SSW of the North edge of seawall.
BENCH MARK STAMPING:
DESIGNATION: 907 6070 MERIDIAN 2
MONUMENTATION: Bench Mark disk VM#: 13184
AGENCY: US Lake Survey IDB PID#: RJ0028
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 46° 30.1' N ( 46.50156) LONGITUDE: 84° 21.8' W ( -84.36406)
The bench mark is a disk set in top of a concrete historical monument (marks
Michigan meridian), 9.75 meters (31.99 ft) North of the center of Canal Street,
5.7 meters (18.7 ft) West of utility pole number A 19/1, 4.5 meters (14.8 ft) NE
of the SE corner of South bridge abutment, 1.4 meters (4.6 ft) S of an East-West
security fence, and 0.91 meters (2.99 ft) North of a steel stairway leading to
the railroad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9076070 PUBLICATION DATE: 08/11/2017
Name: S.W. PIER, ST. MARYS RIVER
MI
NOAA Chart: 14884 Latitude: 46° 30.1' N ( 46.50111)
USGS Quad: Longitude: 84° 22.4' W ( -84.37261)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: KRISTIN 1972 USLS
DESIGNATION: 907 6070 KRISTIN
MONUMENTATION: Survey disk VM#: 13185
AGENCY: US Army Corps of Engineers IDB PID#: RJ0607
SETTING CLASSIFICATION: Bridge overpass pier OPUS PID:
LATITUDE: 46° 30.0' N ( 46.50014) LONGITUDE: 84° 21.8' W ( -84.36394)
The bench mark is a disk set vertically in the West face of the West most one of
two concrete support piers for the southbound lanes of the international highway
bridge over the Soo Locks leading North to Canada, about 195 meters (639.8 ft)
South of the Mac Arthur Lock, 1.85 meters (6.07 ft) South of the North face of
number 16 support pier, 1.80 meters (5.91 ft) North of the South face of number
16 support pier, 1.22 meters (4.00 ft) above the ground surface, 0.40 meters
(1.31 ft) below the top of number 16 support pier surface, in the fifth set of
piers S of the locks.
Foot Notes:
Above marks are published for informational purposes only. Long term stability
has not been reviewed prior to publication.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9076070 PUBLICATION DATE: 08/11/2017
Name: S.W. PIER, ST. MARYS RIVER
MI
NOAA Chart: 14884 Latitude: 46° 30.1' N ( 46.50111)
USGS Quad: Longitude: 84° 22.4' W ( -84.37261)
D E F I N I T I O N S
The International Great Lakes Datum (IGLD) is the vertical height reference
datum used in the Great Lakes/St. Lawrence River System for engineering,
charting, channel dredging, navigation safety, power generation, and water
resource management. It is a coordinated datum between the United States and
Canada that ensures both countries are using the same reference for projects
in the Great Lakes basin. The datum origin, or zero, is defined as Mean Sea
Level at Pointe-au-Pere /Rimouski, Quebec, Canada at the mouth of the
St. Lawrence River. IGLD requires updating approximately every 25-30 years
to account for varying changes in the land surface elevations following the
retreat of the glaciers during the last ice age, referred to as Glacial
Isostatic Adjustment (GIA). The current IGLD 1985 was implemented in 1992.
IGLD 1985 uses dynamic heights as the vertical reference standard and lakes
station water level elevations are adjusted to provide a level geopotential
plane for lake level reference.
Dynamic height is the potential difference along the plumbline between the
vertical datum and a point of interest divided by a constant value of
gravity. In Canada and USA, the constant value of gravity is the
"normal gravity" on the ellipsoid at latitude 45° (9.806199 ms-2). Dynamic
heights have no geometric meaning. They are mainly used for the management
of water in large lakes, rivers and channels. The surface of a lake has a
constant dynamic height if undisturbed by currents, winds, atmospheric
pressure, etc.
The Hydraulic Corrector (HC) is the difference in the long term water level
mean between Subordinate and Master station. The difference (HC) is
subtracted algebraically at the subordinate gauge referencing the same
elevation as the master station. Thus all water levels on a given lake can
be referenced to the same lakes LWD/Chart Datum reference elevation.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9076070 PUBLICATION DATE: 08/11/2017
Name: S.W. PIER, ST. MARYS RIVER
MI
NOAA Chart: 14884 Latitude: 46° 30.1' N ( 46.50111)
USGS Quad: Longitude: 84° 22.4' W ( -84.37261)
D E F I N I T I O N S
A Master Stations is the control point for determining water level
elevations on a particular lake of the Great Lakes. Since water surfaces
of the Great Lakes are considered to be at geopotential equal, all Mean
Water Level (MWL) values for stations on a particular lake should have the
same dynamic height. Therefore, all subordinate water level station MWL
values are adjusted to match the dynamic water level elevation of the Master
Station through the use of a hydraulic corrector. In the establishment of
International Great Lakes Datum (1985) the connecting waterways station
dynamic elevations were calculated through the use of a linear regression
while constraining the end points of the regression with the dynamic
elevations of the corresponding master station above and below the
connecting channel.
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 toNAVD88 are available from NGS through the World Wide
Web at National Geodetic Survey.
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/.