U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9014090 PUBLICATION DATE: 08/11/2017
Name: MOUTH OF THE BLACK RIVER, ST. CLAIR RIV
MI
NOAA Chart: 14852 Latitude: 42° 58.5' N ( 42.97472)
USGS Quad: Longitude: 82° 25.1' W ( -82.41889)
TO REACH THE NOS GAUGING STATION IN PORT HURON, ST CLAIR COUNTY, MI, FROM THE
INTERSECTION OF HURON AVE AND QUAY ST, PROCEED EAST ON QUAY ST FOR 0.20 MILE
(0.32 KM) TO THE INTERSECTION WITH MERCHANT ST, THEN PROCEED SOUTH ON MERCHANT
ST FOR 0.05 MILE (0.08 KM) TO THE END OF THE STREET, TURNING RIGHT INTO THE
ENTRANCE OF THE WASTE WATER TREATMENT FACILITY, THE HOUSE IS LOCATED IN THE BACK
OF THE PROPERTY ADJACENT TO THE TREATMENT FACILITY APPROXIMATELY 100 FT FROM THE
ST. CLAIR RIVER, ADDRESS TO STATION IS 92 MERCHANT STREET.
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 6
Station ID: 9014090 PUBLICATION DATE: 08/11/2017
Name: MOUTH OF THE BLACK RIVER, ST. CLAIR RIV
MI
NOAA Chart: 14852 Latitude: 42° 58.5' N ( 42.97472)
USGS Quad: Longitude: 82° 25.1' W ( -82.41889)
G R E A T L A K E S B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: Z 43 1934
DESIGNATION: Z 43
MONUMENTATION: Bench Mark disk VM#: 12998
AGENCY: US Coast and Geodetic Survey IDB PID#: NE0088
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 42° 58.4' N ( 42.97325) LONGITUDE: 82° 25.2' W ( -82.42047)
The bench mark is a disk North of Water St and/or on the East side of RR tracks,
at the old railroad draw bridge over and on the South side of the Mouth of the
Black River, at the top of the East end of the South abutment, 49.1 m (161.1 ft)
NNE of the centerline of water street, 19.35 m (63.48 ft) South of the end of
the railroad tracks on the South side of the black river, 2.6 m (8.5 ft) East of
the East rail, 0.42 m (1.38 ft) West of the concrete abutment on the South side
of the Black River, and 0.15 m (0.49 ft) lower than rail, drilled in the
abutment.
BENCH MARK STAMPING: 4090 D 1977
DESIGNATION: 901 4090 D
MONUMENTATION: Bench Mark disk VM#: 13003
AGENCY: National Ocean Service (NOS) IDB PID#: NE0955
SETTING CLASSIFICATION: Concrete walkway OPUS PID:
LATITUDE: 42° 58.5' N ( 42.97436) LONGITUDE: 82° 25.1' W ( -82.41858)
The bench mark is a disk on the East side of Merchant St on the SE corner of the
property of the city sewage treatment plant, set in the concrete walkway on the
W bank of the St. Clair River near the extended center of Clyde Street, 7.77 m
(25.49 ft) SE of a steel light pole marked 29, 0.77 m (2.53 ft) SW of the East
face of the bulkhead, and 0.70 m (2.30 ft) NW of the SE corner of the walkway,
being a standard NOS disc set flush with the concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9014090 PUBLICATION DATE: 08/11/2017
Name: MOUTH OF THE BLACK RIVER, ST. CLAIR RIV
MI
NOAA Chart: 14852 Latitude: 42° 58.5' N ( 42.97472)
USGS Quad: Longitude: 82° 25.1' W ( -82.41889)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: S 237 1980
DESIGNATION: S 237
MONUMENTATION: Bench Mark disk VM#: 13006
AGENCY: National Geodetic Survey IDB PID#: NE0956
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 42° 59.2' N ( 42.98714) LONGITUDE: 82° 25.6' W ( -82.42592)
The bench mark is a disk on the North side of Kearney St, in pine Grove City
Park, set in the top of the second tier at the SE corner of the commemorative
monument about 15.2 m (49.9 ft) high, 35.8 m (117.5 ft) North of the East most
doorway on the North side of the water works building number 1200, 11.35 m
(37.24 ft) West of the centerline of Huron Street, 9.95 m (32.64 ft) North of
the centerline of Kearney Street, 8.84 m (29.00 ft) NE of a canon on the SW side
of the median, and 0.76 m (2.49 ft) above the ground level.
BENCH MARK STAMPING: 4090 J 1995
DESIGNATION: 901 4090 J
MONUMENTATION: Bench Mark disk VM#: 17276
AGENCY: National Ocean Service (NOS) IDB PID#: AI2989
SETTING CLASSIFICATION: Set vertically OPUS PID:
LATITUDE: 42° 58.5' N ( 42.97550) LONGITUDE: 82° 25.2' W ( -82.41992)
The bench mark is a disk on the East side of Merchant St, set vertically in the
West face at the NW corner of the brickwork of the waste water treatment plant,
10.40 m (34.12 ft) East of the centerline of Merchant St, 7.6 m (24.9 ft) West
of the center of doors to plant entrance,7.4 m South of the centerline of a
sidewalk leading to entrance of the plant office, 0.4 m (1.3 ft) South of the NW
corner edge of the building, 0.96 m (3.15 ft) above the ground, set vertically
in brick.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9014090 PUBLICATION DATE: 08/11/2017
Name: MOUTH OF THE BLACK RIVER, ST. CLAIR RIV
MI
NOAA Chart: 14852 Latitude: 42° 58.5' N ( 42.97472)
USGS Quad: Longitude: 82° 25.1' W ( -82.41889)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: MBR 2008
DESIGNATION: 901 4090 MBR
MONUMENTATION: Bench Mark disk VM#: 19545
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 42° 58.5' N ( 42.97467) LONGITUDE: 82° 25.1' W ( -82.41881)
The bench mark is a disk set flush in the concrete foundation of the NOS gauge
house, 29.05m (95.3 ft) West of concrete sea wall, 4.75m (15.6 ft) North of the
North edge of parking lot, 0.20m (0.65 ft) SE of the SE corner of NOS gauge
house and is 0.24m (0.8 ft) above ground.
BENCH MARK STAMPING: 4090 K 2011
DESIGNATION: 901 4090 K
MONUMENTATION: Bench Mark disk VM#: 20300
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Retaining wall OPUS PID:
LATITUDE: 42° 58.7' N ( 42.97819) LONGITUDE: 82° 25.2' W ( -82.42011)
The bench mark is a disk set in a concrete retaining wall, 27.99 m (91.8 ft)
South of the most South flag pole of 3 flag poles, 12.22 m (40.1 ft) East of the
centerline of Merchant Drive, 6.32 m (20.7 ft) West of the East edge of a
retaining wall at the exit of underground car garage, 3.87 m (12.7 ft) North of
the South edge of a sidewalk, 0.53 m (1.7 ft) above ground level.
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 5 of 6
Station ID: 9014090 PUBLICATION DATE: 08/11/2017
Name: MOUTH OF THE BLACK RIVER, ST. CLAIR RIV
MI
NOAA Chart: 14852 Latitude: 42° 58.5' N ( 42.97472)
USGS Quad: Longitude: 82° 25.1' W ( -82.41889)
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 6 of 6
Station ID: 9014090 PUBLICATION DATE: 08/11/2017
Name: MOUTH OF THE BLACK RIVER, ST. CLAIR RIV
MI
NOAA Chart: 14852 Latitude: 42° 58.5' N ( 42.97472)
USGS Quad: Longitude: 82° 25.1' W ( -82.41889)
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/.