U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 9014070 PUBLICATION DATE: 08/11/2017
Name: ALGONAC, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 37.3' N ( 42.62111)
USGS Quad: Longitude: 82° 31.6' W ( -82.52666)
TO REACH THE NOS GAUGING STATION IN ALGONAC, ST CLAIR COUNTY, MICHIGAN, FROM
THE INTERSECTION OF ST CLAIR RIVER DR (M-29) AND COLUMBIA ST, PROCEED NORTHEAST
ON ST CLAIR RIVER DR (M-29) FOR APPROX 0.45 MILE, TO THE ALGONAC WATER TREATMENT
PLANT PROPERTY, AT 1530 ST CLAIR RIVER DRIVE (M-29), ON EAST SIDE OF M-29, ON
THE EAST SIDE OF THE PLANT PROPERTY, THE GAUGE HOUSE IS AT THE RIVERS EDGE.
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 8
Station ID: 9014070 PUBLICATION DATE: 08/11/2017
Name: ALGONAC, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 37.3' N ( 42.62111)
USGS Quad: Longitude: 82° 31.6' W ( -82.52666)
G R E A T L A K E S B E N C H M A R K S
PRIMARY BENCH MARK STAMPING:
DESIGNATION: 901 4070 TREAT
ALIAS: TREAT
MONUMENTATION: Metal Rod VM#: 12975
AGENCY: IDB PID#: NE0255
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 42° 37.3' N ( 42.62136) LONGITUDE: 82° 31.7' W ( -82.52783)
The bench mark is a metal rod at the Algonac Water Filtration Plant 1530 St
Clair River Drive (M-29) opposite the junction of green street, set near the S
corner of the plant, 27.4 cm S of the center of the S edge of a concrete
foundation of a large transformer, 0.3 m (1.0 ft) below the ground, 5.8 m (19.0
ft) NE of a chain link fence, 3.5 m (11.5 ft) E of the S corner of the plant,
2.2 m (7.2 ft) SE of the SE face of the plant, note this mark is the top of a
stainless steel plug on top of a 3/8-inch galvanized pipe encased in a 1-inch
steel pipe 43.8 m (143.7 ft) long, and protected by a 6-inch diameter concrete
pipe and an aluminum excess cover flush with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9014070 PUBLICATION DATE: 08/11/2017
Name: ALGONAC, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 37.3' N ( 42.62111)
USGS Quad: Longitude: 82° 31.6' W ( -82.52666)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: 4070 F 1985
DESIGNATION: 901 4070 F
ALIAS: 4070 F
MONUMENTATION: Bench Mark disk VM#: 12977
AGENCY: National Ocean Survey (NOS) IDB PID#: AC9125
SETTING CLASSIFICATION: Concrete cover of storage tank OPUS PID:
LATITUDE: 42° 37.3' N ( 42.62153) LONGITUDE: 82° 31.6' W ( -82.52744)
The bench mark is a disc at the Algonac Water Filtration Plant 1530 St Clair
River Drive (State Highway 29) opposite the junction of Green Street, 35.75 m
(117.29 ft) ENE of the SE corner of the water treatment plant building, 17.4 m
(57.1 ft) SE of the NE corner of the water treatment plant building, 16.8 m
(55.1 ft) NE of utility pole with meter box, 1.70 m (5.58 ft) SW of chain link
fence, 0.15 m (0.49 ft) S of N corner of a 12.8 m (42.0 ft) x 12.8 m (42.0 ft) x
0.6 m (2.0 ft) concrete cover for a water storage tank, 0.55 m (1.80 ft) above
the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9014070 PUBLICATION DATE: 08/11/2017
Name: ALGONAC, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 37.3' N ( 42.62111)
USGS Quad: Longitude: 82° 31.6' W ( -82.52666)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: ORCHARD
DESIGNATION: 901 4070 ORCHARD
MONUMENTATION: Metal Rod VM#: 12979
AGENCY: National Geodetic Survey IDB PID#: NE0253
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 42° 37.3' N ( 42.62103) LONGITUDE: 82° 31.7' W ( -82.52883)
The bench mark is a metal rod at the SW corner of the junction of Orchard Street
and St Clair River Drive (M-29) set on the NE side of the junction of the two
sidewalks, 10.82 m (35.50 ft) WNW of the centerline of St Clair River Drive,
5.91 m (19.39 ft) E of the E corner of the bottom step of house number 1423 St
Clair River Drive, 4.1 m (13.5 ft) N of a fire hydrant, note this mark is a
3/4-inch iron rod (rebar) 2.7 m (8.9 ft) long, encased in a 5-inch PVC pipe with
an aluminum access cover and stamped "Orchard".
BENCH MARK STAMPING: 4070 G 1989
DESIGNATION: 901 4070 G
MONUMENTATION: Bench Mark disk VM#: 12980
AGENCY: National Ocean Survey (NOS) IDB PID#: AC9126
SETTING CLASSIFICATION: Flag pole base OPUS PID:
LATITUDE: 42° 37.2' N ( 42.61989) LONGITUDE: 82° 31.8' W ( -82.52939)
The bench mark is a disc in Algonac City Park, on St Clair River Drive (M-29),
in the N side of concrete flag pole base, 34.32 m (112.60 ft) WNW of bulkhead on
river front, 26.70 m (87.60 ft) NE of NE corner of the museum, 23.10 m (75.79
ft) SE of SE corner of civil war monument, 0.27 m (0.89 ft) N of flag pole,
being standard NOS disc set flush in the concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9014070 PUBLICATION DATE: 08/11/2017
Name: ALGONAC, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 37.3' N ( 42.62111)
USGS Quad: Longitude: 82° 31.6' W ( -82.52666)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: Y 235 1980
DESIGNATION: Y 235
MONUMENTATION: Bench Mark disk VM#: 12981
AGENCY: National Geodetic Survey IDB PID#: NE0926
SETTING CLASSIFICATION: Abutment OPUS PID:
LATITUDE: 42° 37.8' N ( 42.63064) LONGITUDE: 82° 31.0' W ( -82.51744)
The bench mark is a disc set in the NW side of the NE abutment of the Highway 29
bridge over the Marine City drain canal, in the corner of residence property
number 2503, 11.95 m (39.21 ft) NW of the center line of the highway, 0.7 m (2.3
ft) SE of the NW end of the abutment, 0.1 m (0.3 ft) SW of SW face of the wing
wall of the bridge.
BENCH MARK STAMPING: 4070 H 2003
DESIGNATION: 901 4070 H
MONUMENTATION: Bench Mark disk VM#: 17367
AGENCY: National Ocean Service (NOS) IDB PID#: DK8169
SETTING CLASSIFICATION: Brick pumphouse wall OPUS PID:
LATITUDE: 42° 37.3' N ( 42.62111) LONGITUDE: 82° 31.6' W ( -82.52697)
The bench mark is a disc in the rear of the Algonac Water Filtration Plant 1530
St Clair River Drive (State Highway 29) opposite the junction of Green Street,
10.35 m (33.96 ft) ESE of the W corner of the pump house, 10.23 m (33.56 ft) SW
of the SSW of the E corner of the pump house, 5.05 m (16.57 ft) ESE of the
centerline of the double door entrance on the W side of the pump house, and 1.23
m (4.04 ft) above the ground, being a disk set vertically in the down river face
of intake pump house.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9014070 PUBLICATION DATE: 08/11/2017
Name: ALGONAC, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 37.3' N ( 42.62111)
USGS Quad: Longitude: 82° 31.6' W ( -82.52666)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: JAO
DESIGNATION: 901 4070 JAO
MONUMENTATION: Bench Mark disk VM#: 20178
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Gauge house foundation OPUS PID:
LATITUDE: 42° 37.3' N ( 42.62117) LONGITUDE: 82° 31.6' W ( -82.52675)
The bench mark is a disc located on the NOS gauge house foundation, 5.50 m (18.0
ft) SE of a steel DHS camera tower with concrete base, 1.90 m (6.2 ft) NW steel
cap along rivers edge, 10 cm (4 inches) NE of concrete foundation of the NOS
gauge, 0.8 m (2.6 ft) above the ground surface.
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: 9014070 PUBLICATION DATE: 08/11/2017
Name: ALGONAC, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 37.3' N ( 42.62111)
USGS Quad: Longitude: 82° 31.6' W ( -82.52666)
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: 9014070 PUBLICATION DATE: 08/11/2017
Name: ALGONAC, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 37.3' N ( 42.62111)
USGS Quad: Longitude: 82° 31.6' W ( -82.52666)
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/.