U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 9075002 PUBLICATION DATE: 08/11/2017
Name: LAKEPORT, LAKE HURON
MI
NOAA Chart: 14862 Latitude: 43° 8.5' N ( 43.14169)
USGS Quad: Longitude: 82° 29.6' W ( -82.49331)
TO REACH THE NOS GAUGING STATION IN LAKEPORT, ST CLAIR COUNTY, MI, FROM THE
INTERSECTION OF M-25 AND HARRIS RD, PROCEED EAST ON HARRIS RD FOR 0.50 MILE
(0.80 KM) TO THE INTERSECTION WITH LAKESHORE RD, THEN PROCEED SOUTH ON LAKESHORE
RD FOR 0.05 MILE (0.08 KM) TO THE INTERSECTION WITH LAKE ST, THEN PROCEED EAST
ON LAKE ST FOR 0.05 MILE (0.08 KM) TO THE BURTCHVILLE COMMUNITY PAR AND THE NOS
WATER LEVEL GAUGING STATION.
G R E A T L A K E S B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BURTCH
DESIGNATION: 907 5002 BURTCH
MONUMENTATION: Metal Rod VM#: 13030
AGENCY: National Geodetic Survey IDB PID#: OJ0036
SETTING CLASSIFICATION: Metal rod driven into the ground OPUS PID:
LATITUDE: 43° 8.4' N ( 43.14036) LONGITUDE: 82° 29.6' W ( -82.49389)
The bench mark is a metal rod set SE of the oval and North of a 6 x 6-foot brick
water level gauge house, 17.90 m (58.73 ft) NW of the West end of steel jetty
which is ESE of gauge house, 2.56 m (8.40 ft) NW of the NE corner and 2.35 m
(7.71 ft) NE of the NW corner of the gauge house, being the highest point on top
of a stainless steel plug on top of a 3/8-inch diameter galvanized steel pipe,
14.0 m (45.9 ft) long. The pipe is encased in a 1-inch diameter steel pipe. The
pipe with plug is encased in a 5-inch PVC pipe with an aluminum access cover and
stamped Burtch.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9075002 PUBLICATION DATE: 08/11/2017
Name: LAKEPORT, LAKE HURON
MI
NOAA Chart: 14862 Latitude: 43° 8.5' N ( 43.14169)
USGS Quad: Longitude: 82° 29.6' W ( -82.49331)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 907 5002 SWING
MONUMENTATION: Metal Rod VM#: 13031
AGENCY: National Geodetic Survey IDB PID#: OJ0037
SETTING CLASSIFICATION: Metal rod driven into the ground OPUS PID:
LATITUDE: 43° 8.4' N ( 43.14028) LONGITUDE: 82° 29.6' W ( -82.49406)
The bench mark is a metal rod driven into the ground is at the East end of Lake
Street at the Burtch Township Community Beach, set South of the oval of Lake
Street, 39.4 m (129.3 ft) SE of power pole number MI7CA758 in the middle of oval
turn area, 34.1 m (111.9 ft) East of the center of Butternut Street, 21.1 m
(69.2 ft) SW of the SW corner of a 6' x 6' brick water level gauge house, 15.2
cm North of a wooden fence separating the beach area and the first house south
of the beach. The datum point is the highest point on top of a 7/8-inch diameter
iron rod 4.0 m (13.1 ft) long and is encased in a 5-inch PVC pipe with an
aluminum access cover stamped "Swing".
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9075002 PUBLICATION DATE: 08/11/2017
Name: LAKEPORT, LAKE HURON
MI
NOAA Chart: 14862 Latitude: 43° 8.5' N ( 43.14169)
USGS Quad: Longitude: 82° 29.6' W ( -82.49331)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: LAKEPORT 1977
DESIGNATION: LAKEPORT
MONUMENTATION: Triangulation Station disk VM#: 13032
AGENCY: National Geodetic Survey IDB PID#: OJ0600
SETTING CLASSIFICATION: Top of concrete monument OPUS PID:
LATITUDE: 43° 8.4' N ( 43.14036) LONGITUDE: 82° 29.7' W ( -82.49478)
The bench mark is a disk on the South side of Lake St, 30.1 m (98.8 ft) WSW of
power pole no. M17CA758 with light, 29.4 m (96.5 ft) South and across Lake
Street from the SE corner of cabin number 3, 15.4 m (50.5 ft) West of the center
of Butternut Street, 0.40 m (1.31 ft) South of black top pathway, mark is set in
round concrete monument flush with ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9075002 PUBLICATION DATE: 08/11/2017
Name: LAKEPORT, LAKE HURON
MI
NOAA Chart: 14862 Latitude: 43° 8.5' N ( 43.14169)
USGS Quad: Longitude: 82° 29.6' W ( -82.49331)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: LAKEPORT NO 2 1977
DESIGNATION: LAKEPORT RM 2
MONUMENTATION: Reference Mark disk VM#: 13033
AGENCY: National Geodetic Survey IDB PID#: OJ0599
SETTING CLASSIFICATION: Top of concrete monument OPUS PID:
LATITUDE: 43° 8.4' N ( 43.14036) LONGITUDE: 82° 29.7' W ( -82.49494)
The bench mark is a disk on the South side of Lake St, 27.20 m (89.24 ft) SE of
the SE corner of cabin number 5, 23.15 m (75.95 ft) SW of the SW corner of cabin
number 4, 12.2 m (40.0 ft) South of the center of Lake Street, 6.5 m (21.3 ft)
SW of fire hydrant number 265, 1.42 m (4.66 ft) East of the East edge of gravel
parking lot, mark is set flush with the ground in a round concrete monument with
witness post.
BENCH MARK STAMPING: DIAMOND 1960
DESIGNATION: 907 5002 DIAMOND
MONUMENTATION: Metal Rod VM#: 13034
AGENCY: National Geodetic Survey IDB PID#: OJ0033
SETTING CLASSIFICATION: Copper-clad steel rod w/o sleeve OPUS PID:
LATITUDE: 43° 8.4' N ( 43.14039) LONGITUDE: 82° 29.7' W ( -82.49553)
The bench mark is a metal rod on the South side of Lake St, 28.6 m (93.8 ft) SW
of the SW corner of cabin number 5, 13.6 m (44.6 ft) South of the center of Lake
Street, 6.15 m (20.18 ft) SE of power pole 17ca756 with a security light, 10.78
m (35.37 ft) North of black top pathway, 2.83 m (9.28 ft) South of the South
edge of gravel parking lot. The datum point is the highest point on top of a
5/8-inch diameter copper-coated steel rod, 3.0 meters (9.8 ft) long and is
encased in a 5-inch PVC pipe with an aluminum access cover flush with the
ground, stamped "Diamond" encased in a 6-inch iron water access cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9075002 PUBLICATION DATE: 08/11/2017
Name: LAKEPORT, LAKE HURON
MI
NOAA Chart: 14862 Latitude: 43° 8.5' N ( 43.14169)
USGS Quad: Longitude: 82° 29.6' W ( -82.49331)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: DRIVE
DESIGNATION: 907 5002 DRIVE
MONUMENTATION: Metal Rod VM#: 13036
AGENCY: National Geodetic Survey IDB PID#: OJ0035
SETTING CLASSIFICATION: Metal rod driven into the ground OPUS PID:
LATITUDE: 43° 8.5' N ( 43.14089) LONGITUDE: 82° 29.8' W ( -82.49722)
The bench mark is a metal rod driven into the ground on the North side of
Harris, at the gravel driveway to house number 3790 Harris Road, and on the East
side of the metal pipe, 19.97 m (65.52 ft) SE of the SE corner of the house,
9.91 m (32.51 ft) North of the center line of Harris Road, 0.4 m (1.3 ft) East
of the West metal pipe. The datum point is the highest point on a 1-inch square
iron rod, 2.1 m (6.9 ft) long, encased in a 5-inch PVC pipe with an aluminum
access cover stamped "Drive" with a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9075002 PUBLICATION DATE: 08/11/2017
Name: LAKEPORT, LAKE HURON
MI
NOAA Chart: 14862 Latitude: 43° 8.5' N ( 43.14169)
USGS Quad: Longitude: 82° 29.6' W ( -82.49331)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: LAKEPORT 1977 AZ
DESIGNATION: LAKEPORT AZ MK
MONUMENTATION: Azimuth Mark disk VM#: 18303
AGENCY: National Geodetic Survey IDB PID#: OJ0726
SETTING CLASSIFICATION: Top of concrete monument OPUS PID:
LATITUDE: 43° 8.4' N ( 43.13986) LONGITUDE: 82° 29.8' W ( -82.49656)
The bench mark is a disk on the East side of Lakeshore Rd, at the corner of a
fence line, at the SW corner of the park near the roads edge and on the property
line of the Burtchville Community Park and a state park, 80.66 m (264.63 ft)
South of the centerline of the entrance to the Burtchville Community Park, 9.58
m (31.43 ft) East of the centerline of Lake Shore St, 5.70 m (18.70 ft) West of
a metal corner post surrounding the park and picnic area next door, 1.89 m (6.20
ft) North of an unmarked power pole. Mark is set in a 12" round concrete
monument 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 7 of 8
Station ID: 9075002 PUBLICATION DATE: 08/11/2017
Name: LAKEPORT, LAKE HURON
MI
NOAA Chart: 14862 Latitude: 43° 8.5' N ( 43.14169)
USGS Quad: Longitude: 82° 29.6' W ( -82.49331)
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: 9075002 PUBLICATION DATE: 08/11/2017
Name: LAKEPORT, LAKE HURON
MI
NOAA Chart: 14862 Latitude: 43° 8.5' N ( 43.14169)
USGS Quad: Longitude: 82° 29.6' W ( -82.49331)
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/.