U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9014087 PUBLICATION DATE: 08/11/2017
Name: DRY DOCK, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 56.7' N ( 42.94528)
USGS Quad: Longitude: 82° 26.6' W ( -82.44333)
TO REACH THE NOS GAUGE HOUSE, IN PORT HURON, ST CLAIR COUNTY, MI, FROM THE
INTERSECTION OF 10TH ST AND ELECTRIC AVE (94 WEST BUSINESS LOOP), PROCEED SOUTH
ON ELECTRIC AVE (94) FOR APPROX 0.9 MILE (1.4 KM) TO THE INTERSECTION WITH GRANT
PL RD, THEN PROCEED EAST ON GRANT PL RD FOR APPROX 0.10 MILE, AT THE T-JUNCTION
OF THE NORTH BOUND LANES OF MILITARY ST (EAST 94 BUSINESS LOOP) AND GRANT PLACE
RD, THE GAUGE HOUSE IS LOCATED BEHIND THE RESIDENCE AT 3300 MILITARY STREET (M
25).
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 7
Station ID: 9014087 PUBLICATION DATE: 08/11/2017
Name: DRY DOCK, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 56.7' N ( 42.94528)
USGS Quad: Longitude: 82° 26.6' W ( -82.44333)
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 236 1980
DESIGNATION: Z 236
MONUMENTATION: Flange-encased Rod VM#: 12990
AGENCY: National Geodetic Survey IDB PID#: NE0953
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 42° 56.7' N ( 42.94544) LONGITUDE: 82° 26.6' W ( -82.44392)
The bench mark is a stainless steel rod at a one story house number 3300
Military Street, 7.7 m (25.3 ft) SE of the extended center of the North bound
lanes of Grant Place, 3.9 m (12.8 ft) West of the SW corner of the garage, 2.65
m (8.69 ft) SW of the SW edge of the concrete drive leading to the garage.
BENCH MARK STAMPING:
DESIGNATION: 901 4087 STEP
MONUMENTATION: Chiseled Square VM#: 12991
AGENCY: IDB PID#: NE0049
SETTING CLASSIFICATION: Steps OPUS PID:
LATITUDE: 42° 56.7' N ( 42.94547) LONGITUDE: 82° 26.6' W ( -82.44372)
The bench mark is a chiseled square located at 3300 Military Street at the East
corner of the top step on the NE side of the house, directly across Military
Street from the junction of Grant Place, 17.73 m (58.17 ft) SSW of a fire
hydrant along Military Street, 14.84 m (48.69 ft) ESE of the bulkhead in front
of the gauge house, and 1.28 m (4.20 ft) NE of the NE face of the house.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9014087 PUBLICATION DATE: 08/11/2017
Name: DRY DOCK, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 56.7' N ( 42.94528)
USGS Quad: Longitude: 82° 26.6' W ( -82.44333)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: GRATE BAR A 1945
DESIGNATION: 901 4087 GRATE BAR A
MONUMENTATION: Metal Rod VM#: 12992
AGENCY: National Geodetic Survey IDB PID#: NE0048
SETTING CLASSIFICATION: Property lawn OPUS PID:
LATITUDE: 42° 56.7' N ( 42.94567) LONGITUDE: 82° 26.7' W ( -82.44444)
The bench mark is a metal rod set in the lawn on the SE side of the property of
house number 1822 Grant Place, 9.47 m (31.07 ft) East of the East corner of the
house, 5.30 m (17.39 ft) NE of utility pole 6243, 3.22 m (10.56 ft) SW of power
pole 4819, 1.63 m (5.35 ft) North of 24-inch ash, 0.58 m (1.90 ft) SW of SW edge
of sidewalk, 0.56 m (1.84 ft) North of the base of the most North guy wire (one
of two) of power pole number 6243 and is in the lawn of the property. The datum
point is the top of an 1 1/4-inch square iron bar, 2.59 m (8.50 ft) long, set 6
inches below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9014087 PUBLICATION DATE: 08/11/2017
Name: DRY DOCK, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 56.7' N ( 42.94528)
USGS Quad: Longitude: 82° 26.6' W ( -82.44333)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: NO 20
DESIGNATION: PH 20
MONUMENTATION: Survey disk VM#: 12993
AGENCY: City of Port Huron IDB PID#: AC9131
SETTING CLASSIFICATION: Set in the top of a concrete monument OPUS PID:
LATITUDE: 42° 56.9' N ( 42.94769) LONGITUDE: 82° 26.5' W ( -82.44100)
The bench mark is a disk set into the top of a concrete monument on the NW side
of Military St, on the North corner of the intersection of Military St and 16th
St, 6.6m (21.7 ft) NE of the 16th St curb, 15.4m (50.5 ft) SW of the most South
corner of hte reisdence at 3025 Military St., 03.m (1.0 ft) NW of the NW edge of
the Military St sidewalk.
BENCH MARK STAMPING:
DESIGNATION: 901 4087 WALL
MONUMENTATION: Bolt VM#: 12994
AGENCY: IDB PID#: NE0055
SETTING CLASSIFICATION: Wall OPUS PID:
LATITUDE: 42° 56.9' N ( 42.94911) LONGITUDE: 82° 26.3' W ( -82.43847)
The bench mark is a bolt directly across Military St from house number 2949,
26.22 m (86.02 ft) North of the North corner of the concrete block garage of
house number 2964, 22.1 m (72.5 ft) SW of the NE end (driveway) of the retaining
wall, 18.11 m (59.42 ft) SE of the center line of Military Street, this mark is
the highest point of the top of the West one of two 1-inch iron bolts in the top
of a large concrete retaining wall on the SE side of Military Street (94 West
Business Loop).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9014087 PUBLICATION DATE: 08/11/2017
Name: DRY DOCK, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 56.7' N ( 42.94528)
USGS Quad: Longitude: 82° 26.6' W ( -82.44333)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: 4087 F 1990
DESIGNATION: 901 4087 F
MONUMENTATION: Bench Mark disk VM#: 12995
AGENCY: National Ocean Service (NOS) IDB PID#: AC9132
SETTING CLASSIFICATION: Stainless steel rod w/o sleeve OPUS PID#: AC9132
LATITUDE: 42° 56.9' N ( 42.94908) LONGITUDE: 82° 26.5' W ( -82.44147)
The bench mark is a disk on the West side of Electric Ave, at the NE corner of
the intersection of 16th street and electric avenue, 27.6 m (90.6 ft) ENE of the
centerline of 16th Street, 25.6 m (84.0 ft) NNW of the centerline of Electric
Avenue, 22.3 m (73.2 ft) ESE of light pole no. 1732Z057, 17.8 m (58.4 ft) WNW of
light pole no. 1732Z4057, 10.8 m (35.4 ft) NE of steel light pole number
1732Z4058, being highest point of standard NOS benchmark disc protected by
4-inch PVC pipe and cap with, concrete kick block.
BENCH MARK STAMPING: 901 4087 G 2008
DESIGNATION: 901 4087 G
MONUMENTATION: Bench Mark disk VM#: 19002
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Set in sewage facilit;y culvert OPUS PID:
LATITUDE: 42° 56.9' N ( 42.94808) LONGITUDE: 82° 26.5' W ( -82.44169)
The bench mark is a disk set in the concrete foundation of a sewage station
culvert, 14.3m (46.9 ft) SSW of the centerline of 16th street, 9.23 m (30.3 ft)
East of the SE corner of sewage pumping building, 2.65 m (8.7 ft) West of the
East edge of a 3.5 m (11,5 ft) round concrete cap of sewage pipe, 0.21 m (0.7
ft) above 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: 9014087 PUBLICATION DATE: 08/11/2017
Name: DRY DOCK, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 56.7' N ( 42.94528)
USGS Quad: Longitude: 82° 26.6' W ( -82.44333)
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: 9014087 PUBLICATION DATE: 08/11/2017
Name: DRY DOCK, ST. CLAIR RIVER
MI
NOAA Chart: 14852 Latitude: 42° 56.7' N ( 42.94528)
USGS Quad: Longitude: 82° 26.6' W ( -82.44333)
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/.