U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9099044 PUBLICATION DATE: 08/11/2017
Name: ONTONAGON, LAKE SUPERIOR
MI
NOAA Chart: 14965 Latitude: 46° 52.5' N ( 46.87444)
USGS Quad: Longitude: 89° 19.4' W ( -89.32417)
TO REACH THE NOS GAUGING STATION IN ONTONAGON, ONTONAGON COUNTY, MICHIGAN, FROM
THE INTERSECTION OF HWY M-64 AND RIVER ST, PROCEED NORTH ON RIVER ST FOR APPROX
0.10 MILE (0.16 KM) TO THE END OF RIVER ST, THE NOS WATER LEVEL GAUGE HOUSE IS
ON THE WEST SIDE OF RIVER ST AT THE WATERS EDGE, ALONG THE CONCRETE BULKHEAD, ON
THE NORTHEAST SIDE OF THE ONTONAGON RIVER.
G R E A T L A K E S B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 909 9044 VFW
DESIGNATION: 909 9044 VFW
MONUMENTATION: Metal Rod VM#: 13381
AGENCY: National Geodetic Survey IDB PID#: AE8284
SETTING CLASSIFICATION: Copper-clad steel rod w/o sleeve OPUS PID:
LATITUDE: 46° 52.5' N ( 46.87475) LONGITUDE: 89° 19.3' W ( -89.32214)
The bench mark is a copper-clad steel rod 14.2m (46.6 ft) SE of the VFW Post
5600 sign post, 0.3m (1.0 ft) NE of the NE edge of sidewalk, 0.3m (1.0 ft) SW of
the S corner of the VFW hall, and in line with the S face of building, 12.2cm
below ground protected by a 5-inch PVC pipe and aluminum access cover stamped
"909 9044 VFW", surrounded by concrete and flush with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9099044 PUBLICATION DATE: 08/11/2017
Name: ONTONAGON, LAKE SUPERIOR
MI
NOAA Chart: 14965 Latitude: 46° 52.5' N ( 46.87444)
USGS Quad: Longitude: 89° 19.4' W ( -89.32417)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 909 9044 2
MONUMENTATION: Chiseled Triangle VM#: 13375
AGENCY: IDB PID#: RL1512
SETTING CLASSIFICATION: Concrete water table OPUS PID:
LATITUDE: 46° 52.4' N ( 46.87333) LONGITUDE: 89° 19.6' W ( -89.32586)
The bench mark is a chiseled triangle 9.00m (29.53 ft) N of the S corner of the
lighthouse, 3.67m (12.04 ft) NE of the NW corner of the lighthouse, 2.72m (8.92
ft) E of the W inside corner of the lighthouse, 0.65m (2.13 ft) above ground,
being a chiseled cut forming a triangle on the corner of the water table. U.S.
B.M. is stamped on the water table.
BENCH MARK STAMPING: 909 9044 A 1977
DESIGNATION: 909 9044 A
MONUMENTATION: Bench Mark disk VM#: 13377
AGENCY: National Ocean Survey IDB PID#: AE8280
SETTING CLASSIFICATION: Bridge retaining wall OPUS PID:
LATITUDE: 46° 52.4' N ( 46.87381) LONGITUDE: 89° 19.2' W ( -89.32072)
The benchmark is a disk 20.5m (67.3 ft) SW of the centerline of River St., 9.9m
(32.5 ft) NW of the centerline of Ontonagon St., 0.3 meters (1.0 ft) NW of
concrete guard rail of bridge, in the highest step of a three step retaining
wall supporting the north corner of bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9099044 PUBLICATION DATE: 08/11/2017
Name: ONTONAGON, LAKE SUPERIOR
MI
NOAA Chart: 14965 Latitude: 46° 52.5' N ( 46.87444)
USGS Quad: Longitude: 89° 19.4' W ( -89.32417)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: 9044 J 1983
DESIGNATION: 909 9044 J
MONUMENTATION: Bench Mark disk VM#: 13379
AGENCY: National Ocean Survey IDB PID#: AE8282
SETTING CLASSIFICATION: Concrete bulkhead cap OPUS PID:
LATITUDE: 46° 52.5' N ( 46.87436) LONGITUDE: 89° 19.5' W ( -89.32442)
The bench mark is a disk 19.2m (63.0 ft) W of W corner of NOS gauge house, 9.07m
(29.76 ft) S of the corner of the steel bulkhead, 8.9m (29.2 ft) E of W edge of
steel bulkhead, just N of the gate opening on the bulkhead running N, 0.50
meters (1.64 ft) W on N-S fence line, set flush in the top of a concrete
bulkhead cap.
BENCH MARK STAMPING: 9044 K 1987
DESIGNATION: 909 9044 K
MONUMENTATION: Bench Mark disk VM#: 13380
AGENCY: National Ocean Service IDB PID#: AE8283
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 46° 52.5' N ( 46.87433) LONGITUDE: 89° 19.5' W ( -89.32417)
The bench mark is a disk 5.85m (19.19 ft) NNE of the SW corner of the bulkhead,
3.65m (11.98 ft) SSW of the NE corner of the bulkhead, 18.3 cm W of the S
corner, between the gauge house and the railing, set flush with the concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9099044 PUBLICATION DATE: 08/11/2017
Name: ONTONAGON, LAKE SUPERIOR
MI
NOAA Chart: 14965 Latitude: 46° 52.5' N ( 46.87444)
USGS Quad: Longitude: 89° 19.4' W ( -89.32417)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: 909 9044 CHEVY
DESIGNATION: 909 9044 CHEVY
MONUMENTATION: Metal Rod VM#: 13382
AGENCY: National Geodetic Survey IDB PID#: AE8285
SETTING CLASSIFICATION: Copper-clad steel rod w/o sleeve OPUS PID:
LATITUDE: 46° 52.5' N ( 46.87450) LONGITUDE: 89° 19.3' W ( -89.32164)
The bench mark is a copper-clad steel rod 10.1m (33.1 ft) E of the centerline of
river street, 3.9m (12.8 ft) NE of utility pole no. D731, 0.6m (2.0 ft) N of the
N edge of the lake street sidewalk, 0.4m (1.3 ft) SW of the SW corner and in
line with the S face of the building now used as the Riverview Senior Center,
being the highest point of 5/8 inch copper coated steel rod 12.2 cm below ground
protected by a 5-inch PVC pipe and aluminum access cover stamped "909 9044
Chevy" surrounded by concrete and flush with the ground.
BENCH MARK STAMPING: 9044 L 98
DESIGNATION: 909 9044 L
MONUMENTATION: Metal Rod VM#: 18339
AGENCY: National Geodetic Survey IDB PID#: DJ5175
SETTING CLASSIFICATION: Stainless steel rod w/o sleeve OPUS PID:
LATITUDE: 46° 52.5' N ( 46.87450) LONGITUDE: 89° 19.4' W ( -89.32281)
The bench mark is a stainless steel rod 55.01m (180.48 ft) NNE of the E bank of
the Ontonagon River, 37.83m (124.11 ft) S of the second power pole, 30.62m
(100.46 ft) NW of the NW corner of the garage of the office complex, 15.51m
(50.89 ft) SE of a witness post and encased in a 5-inch pvc pipe and concrete
kickblock, and aluminum access cover flush with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9099044 PUBLICATION DATE: 08/11/2017
Name: ONTONAGON, LAKE SUPERIOR
MI
NOAA Chart: 14965 Latitude: 46° 52.5' N ( 46.87444)
USGS Quad: Longitude: 89° 19.4' W ( -89.32417)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: D 135 RESET
MONUMENTATION: Metal Rod VM#: 18850
AGENCY: IDB PID#:
SETTING CLASSIFICATION: Aluminum alloy rod w/o sleeve OPUS PID:
LATITUDE: 46° 52.3' N ( 46.87225) LONGITUDE: 89° 19.3' W ( -89.32222)
The bench mark is an aluminum alloy rod 47.1m (154.5 ft) NE of a fire hydrant,
17.4m (57.1 ft) NW of HWY M-64 centerline, 1.5m (4.9 ft) S of the S edge of a
security fence, 0.3m (1.0 ft) E of a carbonite witness post, protected by a
standard Michigan Dept of Transportation HWY monument box, concrete kick block,
approx 2.4m (7.87 ft) below highway ground surface, sleeve and wtiness post, rod
driven 4.3m (14.11 ft) to refusal.
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: 9099044 PUBLICATION DATE: 08/11/2017
Name: ONTONAGON, LAKE SUPERIOR
MI
NOAA Chart: 14965 Latitude: 46° 52.5' N ( 46.87444)
USGS Quad: Longitude: 89° 19.4' W ( -89.32417)
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: 9099044 PUBLICATION DATE: 08/11/2017
Name: ONTONAGON, LAKE SUPERIOR
MI
NOAA Chart: 14965 Latitude: 46° 52.5' N ( 46.87444)
USGS Quad: Longitude: 89° 19.4' W ( -89.32417)
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/.