U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 9076024 PUBLICATION DATE: 08/11/2017
Name: ROCK CUT, ST. MARYS RIVER
MI
NOAA Chart: 14883 Latitude: 46° 15.9' N ( 46.26481)
USGS Quad: Longitude: 84° 11.5' W ( -84.19119)
TO REACH THE NOS GAUGING STATION, IN BRUCE TOWNSHIP, CHIPPEWA COUNTY, MICHIGAN,
FROM THE INTERSECTION OF FIFTEEN MILE ROAD AND THE POST OFFICE IN BARBEAU,
PROCEED EAST ALONG FIFTEEN MILE ROAD FOR 4.7 KM (2.90 MI) , TO THE INTERSECTION
WITH SCENIC RD (RIVER RD), THEN PROCEED SOUTH FOR ALONG SCENIC RD (RIVER ROAD)
FOR 4.43 KM (2.75 MI) TO THE ENTRANCE OF A LOCKED GATE ON THE EAST SIDE OF ROAD,
THEN PROCEED EAST 0.24 KM (0.15 MI) THRU ANOTHER LOCKED GATE ALONG A GRAVELED
DRIVEWAY OWNED BY THE U.S.ARMY CORPS OF ENGINEERS, ON THE SOUTH SIDE OF THE SPIT
OF LAND KNOWN AS THE LOWER DAM, AND AT THE SOUTH END OF THE ROCK CUT CHANNEL.TO
NOS 6'X 6' FIBERGLASS WATER LEVEL GAUGING BUILDING.
G R E A T L A K E S B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6024 B 2001
DESIGNATION: 907 6024 B
MONUMENTATION: Survey disk VM#: 18388
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 46° 15.9' N ( 46.26469) LONGITUDE: 84° 11.5' W ( -84.19103)
The bench mark is a disk 184.1 m (604.0 ft) East from the centerline of scenic
road, 8.32 m (27.30 ft) South of the North edge of a wood bulkhead on the North
side of the property, 6.55 m (21.49 ft) West of the most East bollard on the
North bulkhead, 6.40 m (21.00 ft) E of the 2nd most East bollard on the North
bulkhead. The bench mark is a 12 inch diameter corrugated pipe, 3.7m (12.1 ft)
long and filled with concrete, the concrete base is flared out for approximately
1.2m (3.9 ft) on all sides, the top of the post is flush with the ground, with
witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9076024 PUBLICATION DATE: 08/11/2017
Name: ROCK CUT, ST. MARYS RIVER
MI
NOAA Chart: 14883 Latitude: 46° 15.9' N ( 46.26481)
USGS Quad: Longitude: 84° 11.5' W ( -84.19119)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: ENG 1988
DESIGNATION: 907 6024 ENG
MONUMENTATION: Survey disk VM#: 18389
AGENCY: National Ocean Service IDB PID#: AH5400
SETTING CLASSIFICATION: Steel bulkhead with concrete cap OPUS PID:
LATITUDE: 46° 15.9' N ( 46.26442) LONGITUDE: 84° 11.5' W ( -84.19097)
The bench mark is a disk 184.1 m (604.0 ft) South from the centerline of scenic
road, set into a drill hole in concrete near the most SE bollard on second and
most East cell, 3.05 m (10.01 ft) West from the outside bulkhead, 0.95 m (3.12
ft) SE from the most SE bollard.
BENCH MARK STAMPING: 6024 C 2001
DESIGNATION: 907 6024 C
MONUMENTATION: Survey disk VM#: 18390
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Small old concrete foundation OPUS PID:
LATITUDE: 46° 15.8' N ( 46.26400) LONGITUDE: 84° 11.5' W ( -84.19242)
The bench mark is a disk set in the center of an 8' x 8' concrete pad just West
of the second gate, 152.4 m (500.0 ft) East from the centerline of Scenic Road,
14.32 m (46.98 ft) ENE of the centerline of the gate, 3.56 m (11.68 ft) NW of
the centerline of a dirt gravel road, 1.40 m (4.59 ft) S of the N edge of a
concrete pad, 1.17 m (3.84 ft) West of the East edge of a concrete pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9076024 PUBLICATION DATE: 08/11/2017
Name: ROCK CUT, ST. MARYS RIVER
MI
NOAA Chart: 14883 Latitude: 46° 15.9' N ( 46.26481)
USGS Quad: Longitude: 84° 11.5' W ( -84.19119)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: SM 24 1934
DESIGNATION: 907 6024 SM 24
MONUMENTATION: Survey disk VM#: 18391
AGENCY: US Lake Survey IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 46° 15.8' N ( 46.26389) LONGITUDE: 84° 11.6' W ( -84.19278)
The bench mark is a disk 24.1 m (79.1 ft) NW of the center line of the gravel
driveway, 16.52 m (54.20 ft) NW of a East-West fence line, 11.58 m (37.99 ft) SW
of the water's edge, 2.95 m (9.68 ft) West of a rock mound/bed along the
shoreline, in a low wetlands type area, outside fenced in COE property.
BENCH MARK STAMPING: 6024 D 2001
DESIGNATION: 907 6024 D
MONUMENTATION: Survey disk VM#: 18392
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete loading dock OPUS PID:
LATITUDE: 46° 15.8' N ( 46.26386) LONGITUDE: 84° 11.6' W ( -84.19269)
The bench mark is a disk 24.50 m (80.38 ft) WSW of the centerline of a gravel
driveway, 9.11 m (29.89 ft) North of the SE corner face of the concrete loading
dock, 3.56 m (11.68 ft) East of the NE corner of the warehouse building, 0.49 m
(1.61 ft) above the ground, set in the top of the NE corner of the concrete
loading dock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9076024 PUBLICATION DATE: 08/11/2017
Name: ROCK CUT, ST. MARYS RIVER
MI
NOAA Chart: 14883 Latitude: 46° 15.9' N ( 46.26481)
USGS Quad: Longitude: 84° 11.5' W ( -84.19119)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: 6024 E 2001
DESIGNATION: 907 6024 E
MONUMENTATION: Survey disk VM#: 18393
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete loading dock OPUS PID:
LATITUDE: 46° 15.8' N ( 46.26381) LONGITUDE: 84° 11.6' W ( -84.19269)
The bench mark is a disk set in the SE corner of concrete loading dock, 27.0 m
(88.6 ft) SW of center line of second set of gates to the lower dam and gauge
house, 14.21 m (46.62 ft) South of the center line of gravel driveway, 3.70 m
(12.14 ft) East of the SE corner of warehouse building, 0.15 m (0.49 ft) North
of South edge of loading dock, 0.5 m (1.6 ft) above ground.
BENCH MARK STAMPING: 6024 G 2001
DESIGNATION: 907 6024 G
MONUMENTATION: Flange-encased Rod VM#: 18394
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 46° 15.8' N ( 46.26311) LONGITUDE: 84° 11.6' W ( -84.19353)
The bench mark is a stainless steel rod 16.45 m (53.97 ft) NE of center line of
Scenic Drive, 10.37 m (34.02 ft) ESE of a fence line on the West side of the
gravel driveway, 8.76 m (28.74 ft) WNW of a fence line on the East side of the
gravel driveway, 8.0 m (26.2 ft) WNW of power pole numbered "DR2 278", 2.96 m
(9.71 ft) WNW of the centerline of the driveway at the centerline of the
entrance gate, encased in a 5 inch PVC sleeve with aluminum access lid and
witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9076024 PUBLICATION DATE: 08/11/2017
Name: ROCK CUT, ST. MARYS RIVER
MI
NOAA Chart: 14883 Latitude: 46° 15.9' N ( 46.26481)
USGS Quad: Longitude: 84° 11.5' W ( -84.19119)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: 6024 H 2001
DESIGNATION: 907 6024 H
MONUMENTATION: Flange-encased Rod VM#: 18395
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 46° 15.9' N ( 46.26481) LONGITUDE: 84° 11.7' W ( -84.19556)
The bench mark is a stainless steel rod 20.0 m (65.6 ft) South of the centerline
of the driveway at entrance to 16629, 19.80 m (64.96 ft) North of the centerline
of the driveway entrance to residence 16655, 6.95 m (22.80 ft) E of the
centerline of Scenic Drive, 3.46 m (11.35 ft) South of a the centerline of power
pole number "DR2-275", 1.10 m (3.61 ft) West of a North-South chain linked fence
line, encased in a 5 inch PVC sleeve with aluminum access lid and witness post.
BENCH MARK STAMPING:
DESIGNATION: 6028 H
MONUMENTATION: Flange-encased Rod VM#: 18396
AGENCY: IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 46° 15.5' N ( 46.25881) LONGITUDE: 84° 11.3' W ( -84.18800)
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9076024 PUBLICATION DATE: 08/11/2017
Name: ROCK CUT, ST. MARYS RIVER
MI
NOAA Chart: 14883 Latitude: 46° 15.9' N ( 46.26481)
USGS Quad: Longitude: 84° 11.5' W ( -84.19119)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 6028 G
MONUMENTATION: Flange-encased Rod VM#: 18397
AGENCY: IDB PID#:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 46° 15.5' N ( 46.25881) LONGITUDE: 84° 11.3' W ( -84.18800)
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 7 of 8
Station ID: 9076024 PUBLICATION DATE: 08/11/2017
Name: ROCK CUT, ST. MARYS RIVER
MI
NOAA Chart: 14883 Latitude: 46° 15.9' N ( 46.26481)
USGS Quad: Longitude: 84° 11.5' W ( -84.19119)
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 8 of 8
Station ID: 9076024 PUBLICATION DATE: 08/11/2017
Name: ROCK CUT, ST. MARYS RIVER
MI
NOAA Chart: 14883 Latitude: 46° 15.9' N ( 46.26481)
USGS Quad: Longitude: 84° 11.5' W ( -84.19119)
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/.