U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9044049 PUBLICATION DATE: 08/11/2017
Name: WINDMILL POINT, DETROIT RIVER
MI
NOAA Chart: 14848 Latitude: 42° 21.4' N ( 42.35750)
USGS Quad: Longitude: 82° 55.8' W ( -82.93000)
TO REACH THE NOS GAUGING STATION, AT WINDMILL PT, DETROIT, WAYNE COUNTY,
MICHIGAN, FROM THE INTERSECTION OF JEFFERSON E AND ALTER RD, PROCEED EAST ON
ALTER RD FOR APPROX 1.20 MILES (1.93 KM) TO THE MARINER CITY PARK, NEAR THE FOOT
OF ALTER ROAD, AT THE SOUTH SOUTHWEST CORNER OF MARINERS PARK, ON FORMER
PRORERTY OF THE U.S. PUBLIC HEALTH SERVICE HOSPITAL, TO THE GAUGE HOUSE.
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: 904 4049 USPHS
MONUMENTATION: Survey disk VM#: 12961
AGENCY: US Army Corps of Engineers IDB PID#: NE0136
SETTING CLASSIFICATION: Gauge house foundation OPUS PID:
LATITUDE: 42° 21.5' N ( 42.35778) LONGITUDE: 82° 55.8' W ( -82.92994)
The bench mark is a disk set at the SSW corner of Mariners Park, on former
property of the U.S. Public Health Service Hospital, in top of the West corner
of concrete foundation of NOS gauge house, 0.4 m (1.3 ft) SW of SW edge of gauge
house door, 0.3 m (1.0 ft) NE of the SW edge of the concrete foundation, about
15.2 cm above the ground, being highest point over cross at center of bronze
disc set into the concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9044049 PUBLICATION DATE: 08/11/2017
Name: WINDMILL POINT, DETROIT RIVER
MI
NOAA Chart: 14848 Latitude: 42° 21.4' N ( 42.35750)
USGS Quad: Longitude: 82° 55.8' W ( -82.93000)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 904 4049 DWELLING
MONUMENTATION: Pipe Cap VM#: 12960
AGENCY: National Geodetic Survey IDB PID#: NE0137
SETTING CLASSIFICATION: Galvanized steel pipe w/o sleeve OPUS PID:
LATITUDE: 42° 21.5' N ( 42.35783) LONGITUDE: 82° 55.8' W ( -82.92992)
The bench mark is a pipe cap at the SSW corner of Mariners Park, on the former
property of the US Public Service Hospital, no 14700 Riverside Drive, 21.65 m
(71.03 ft) NNW of the bulkhead running NE and SW, 16.84 m (55.25 ft) North of
the North corner of the NOS gauge house, 9.02 m (29.59 ft) WSW of the centerline
of new entrance drive as it runs into the parking lot area, 8.94 m (29.33 ft)
East of the most North of two maple trees, 4.00 m (13.12 ft) WSW of ornamental
wood fence along parking lot, 1-1/2 ft below ground surface, being the highest
point on top of a stainless steel plug on top of a 3/8 inch diameter galvanized
steel pipe, 7.6 m (24.9 ft) long. The pipe is encased in a 1-inch diameter
concrete pipe. The mark is protected by a 5-inch PVC pipe and concrete kick
block with an aluminum access cover which is flush with the ground, stamped
"dwelling".
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9044049 PUBLICATION DATE: 08/11/2017
Name: WINDMILL POINT, DETROIT RIVER
MI
NOAA Chart: 14848 Latitude: 42° 21.4' N ( 42.35750)
USGS Quad: Longitude: 82° 55.8' W ( -82.93000)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: 4049 K 1989
DESIGNATION: 904 4049 K
MONUMENTATION: Bench Mark disk VM#: 12962
AGENCY: National Ocean Survey (NOS) IDB PID#: AA9381
SETTING CLASSIFICATION: Stainless steel rod w/o sleeve OPUS PID:
LATITUDE: 42° 21.6' N ( 42.35928) LONGITUDE: 82° 55.9' W ( -82.93083)
The bench mark is a disk located at Mariners Park, 47.9 m (157.2 ft) SSE of the
center line of Riverside Drive, 12.44 m (40.81 ft) West of the centerline of the
park driveway, 8.3 m (27.2 ft) ENE of a light pole, 7.58 m (24.87 ft) West of an
ornamental fence running along the side of park drive,6.50 m WNW of a 14 inch
beech tree and is 0.27 m (0.89 ft) below ground, a stainless steel rod driven
11.0 m (36.1 ft) to refusal and protected by a 6-inch diameter PVC pipe with
aluminum access cover, 0.50 m (1.64 ft) SE of new witness post, 0.4 in below
ground surface.
BENCH MARK STAMPING: 4049 J 1987
DESIGNATION: 904 4049 J
MONUMENTATION: Survey disk VM#: 12964
AGENCY: National Ocean Survey (NOS) IDB PID#: AA9382
SETTING CLASSIFICATION: Bridge retaining wall OPUS PID:
LATITUDE: 42° 21.7' N ( 42.36094) LONGITUDE: 82° 55.8' W ( -82.93044)
The bench mark is a disk set on the South side of alter road and is at the
intersection of Klenk St. and Alter Road, in the top of North most corner of
retaining wall for bridge over Fox Creek, 7.9 m (25.9 ft) West of the center
line of alter road, 5.8 m (19.0 ft) North of the center line of Klenk St., 0.8 m
(2.6 ft) SW of the North most corner of wall, 0.7 m (2.3 ft) above the level of
the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9044049 PUBLICATION DATE: 08/11/2017
Name: WINDMILL POINT, DETROIT RIVER
MI
NOAA Chart: 14848 Latitude: 42° 21.4' N ( 42.35750)
USGS Quad: Longitude: 82° 55.8' W ( -82.93000)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: 4049 L 1998
DESIGNATION: 904 4049 L
MONUMENTATION: Flange-encased Rod VM#: 17271
AGENCY: National Geodetic Survey IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod w/o sleeve OPUS PID:
LATITUDE: 42° 21.5' N ( 42.35864) LONGITUDE: 82° 55.8' W ( -82.93058)
The bench mark is a stainless steel rod set at the SW side of Mariners Park, on
the former property of the US Public Service Hospital, at 14700 Riverside Drive,
121.4 m (398.3 ft) SW of the center line of Riverside Drive, 15.65 m (51.35 ft)
West of the center line of a gravel drive running North and South, 5.3 m (17.4
ft) NNE of chain link fence running North and South by trailer park, 11.10 m
(36.42 ft) W of the ornamental wood fence running along the side of park
driveway, 4.65 m (15.26 ft) East of East face of power pole number 35-5, a
stainless steel rod driven 23.8 m (78.1 ft) to refusal encased in a 1.2 m (3.9
ft) greased sleeve and protected by a 5-inch diameter PVC pipe with aluminum
access cover flush with the ground.
BENCH MARK STAMPING: 4049 N 2014
DESIGNATION: 904 4049 N
MONUMENTATION: Bench Mark disk VM#: 21310
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge parapet OPUS PID:
LATITUDE: 42° 21.5' N ( 42.35908) LONGITUDE: 82° 56.0' W ( -82.93253)
The bench mark is a disk set in the concrete parapet of a bridge located 12.9m
(42.4 ft) SW of the NE end of a bridge wing wall, 6.2m (20.4 ft) SE of the
centerline of Riverside Dr. 0.6m (2.0 ft) NE of the SW end of a bridge wing
wall, and 0.81m (2.7 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9044049 PUBLICATION DATE: 08/11/2017
Name: WINDMILL POINT, DETROIT RIVER
MI
NOAA Chart: 14848 Latitude: 42° 21.4' N ( 42.35750)
USGS Quad: Longitude: 82° 55.8' W ( -82.93000)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: 4049 M 2015
DESIGNATION: 904 4049 M
MONUMENTATION: Metal Rod VM#: 21807
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBDY74
LATITUDE: 42° 21.6' N ( 42.35975) LONGITUDE: 82° 55.8' W ( -82.93036)
The bench mark is a stainless steel rod 44.2m (145.2 ft) ENE of the centerline
of Windmill Point Lighthouse Road, 32.8m (107.6 ft) SW of the South most corner
of bridge abutment crossing the fox river, 19.4m (63.6 ft) SSE of the centerline
of Riverside Boulevard, and 5.4m (17.7 ft) NNW of a witness post being a
stainless steel rod driven 21.4m (70.3 ft) to refusal encased in a 1.2m (4.0 ft)
greased sleeve and protected by a 5 inch diamter pvc pipe with aluminum access
cover flush with the ground.
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: 9044049 PUBLICATION DATE: 08/11/2017
Name: WINDMILL POINT, DETROIT RIVER
MI
NOAA Chart: 14848 Latitude: 42° 21.4' N ( 42.35750)
USGS Quad: Longitude: 82° 55.8' W ( -82.93000)
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: 9044049 PUBLICATION DATE: 08/11/2017
Name: WINDMILL POINT, DETROIT RIVER
MI
NOAA Chart: 14848 Latitude: 42° 21.4' N ( 42.35750)
USGS Quad: Longitude: 82° 55.8' W ( -82.93000)
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/.