U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9075065 PUBLICATION DATE: 08/11/2017
Name: ALPENA, THUNDER BAY, LAKE HURON
MI
NOAA Chart: 14864 Latitude: 45° 3.8' N ( 45.06300)
USGS Quad: Longitude: 83° 25.7' W ( -83.42860)
TO REACH THE NOS GAUGING STATION, IN ALPENA COUNTY, ALPENA, MICHIGAN, FROM THE
INTERSECTION OF US-23 (CHISHOLM ST) AND M-32W (THIRD AVE), PROCEED SOUTH ALONG
US-23 (CHISHOLM ST) FOR 0.2 KM (0.10 MI) TO THE INTERSECTION OF US-23 (CHISHOLM
ST) AND SECOND AVE, PROCEED EAST ON SECOND AVE FOR 0.3 KM (0.20 MI) TO THE
INTERSECTION OF SECOND AVE AND FLETCHER ST, PROCEED SOUTHEAST ON FLETCHER ST FOR
0.2 KM (0.10 MI) TO THE D.N.R. PROPERTY ENTRANCE, THE NOAA - NOS WATER LEVEL
GAUGE STATION IS LOCATED ON THE SOUTHWEST CORNER OF THE PROPERTY, ON THE NORTH
SHORE AND NEAR THE MOUTH OF THE ALPENA RIVER, ON THE EAST SIDE OF THE CITY OF
ALPENA BOAT LAUNCH RAMP.
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: 907 5065 POST OFFICE
MONUMENTATION: Survey disk VM#: 18360
AGENCY: US Lake Survey IDB PID#: QJ0009
SETTING CLASSIFICATION: Federal Building OPUS PID:
LATITUDE: 45° 3.8' N ( 45.06253) LONGITUDE: 83° 25.8' W ( -83.43017)
The bench mark is a disk set vertically in the NE face (river side) and at the
East corner of the federal building (old post office), 8.8 m (28.9 ft) NW of the
NW curb of first street, 3.3 m (10.8 ft) SW of the SW curb of the federal
building drive, 0.4 m (1.3 ft) NE of the East corner of the building, 0.9 m (3.0
ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9075065 PUBLICATION DATE: 08/11/2017
Name: ALPENA, THUNDER BAY, LAKE HURON
MI
NOAA Chart: 14864 Latitude: 45° 3.8' N ( 45.06300)
USGS Quad: Longitude: 83° 25.7' W ( -83.42860)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: CITY HALL LDK 1941
DESIGNATION: 907 5065 CITY HALL
MONUMENTATION: Survey disk VM#: 18361
AGENCY: US Lake Survey IDB PID#: QJ0096
SETTING CLASSIFICATION: City hall building OPUS PID:
LATITUDE: 45° 3.7' N ( 45.06175) LONGITUDE: 83° 25.8' W ( -83.43036)
The bench mark is a disk at the city hall building, set vertically in the NW
face and on the NE side of the main entrance to the city hall building, 15.70 m
(51.51 ft) S of a flag pole, 6.61 m (21.69 ft) SW of the NE corner, 4.57 m
(14.99 ft) NE of the extended center of the two doors at the main entrance, 3.90
m (12.80 ft) South of the South edge of a East-West sidewalk, 1.21 m (3.97 ft)
above the ground.
BENCH MARK STAMPING: RIVER CBF 1963 USLS
DESIGNATION: 907 5065 RIVER
MONUMENTATION: Survey disk VM#: 18362
AGENCY: Army Corps of Engineers IDB PID#: QJ0103
SETTING CLASSIFICATION: Abutment wall of bridge OPUS PID:
LATITUDE: 45° 3.8' N ( 45.06344) LONGITUDE: 83° 25.9' W ( -83.43114)
The bench mark is a disk set vertically in the South face of the SSW abutment of
the second street bridge over the Thunder Bay river, on West side of river,
11.34 m (37.20 ft) SW of a power line pole, 9.05 m (29.69 ft) SE of the
centerline of Second Avenue, 1.92 m (6.30 ft) below the top of the abutment,
1.52 m (4.99 ft) above the break wall, 0.82 m (2.69 ft) below second avenue.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9075065 PUBLICATION DATE: 08/11/2017
Name: ALPENA, THUNDER BAY, LAKE HURON
MI
NOAA Chart: 14864 Latitude: 45° 3.8' N ( 45.06300)
USGS Quad: Longitude: 83° 25.7' W ( -83.42860)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: ALPENA 3 2005
DESIGNATION: 907 5065 ALPENA 3
MONUMENTATION: Survey disk VM#: 18363
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Foundation of a small building OPUS PID:
LATITUDE: 45° 3.8' N ( 45.06303) LONGITUDE: 83° 25.7' W ( -83.42850)
The bench mark is a disk 15.98 m (52.43 ft) NE of the West edge of the steel cap
along the rivers East bank, 11.15 m (36.58 ft) NW of the center line of a yellow
2-ton crane permanently affixed to a concrete pad on the edge of river wall,
8.86 m (29.07 ft) SE of the inside edge of boat launch, 0.46 m (1.51 ft) East of
the NE most of 3 poles in a Rohn tower next to the NOS water level station, set
in the tower concrete base located next to the brick NOS water level gauge
station.
BENCH MARK STAMPING: 907 5065 G 2006
DESIGNATION: 907 5065 G
MONUMENTATION: Flange-encased Rod VM#: 18364
AGENCY: National Geodetic Survey IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 45° 3.8' N ( 45.06289) LONGITUDE: 83° 25.7' W ( -83.42864)
The bench mark is a stainless steel rod 9.58 m (31.43 ft) SW of the West face of
brick NOS water level station, 7.56 m (24.80 ft) SE of the inside edge of boat
launch, 2.63 m (8.63 ft) NE of the West edge of steel cap along the rivers East
bank, 0.83 m (2.72 ft) NW of the North edge of concrete sidewalk, being a deep
rod with 5-inch sleep and concrete kick block level with grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9075065 PUBLICATION DATE: 08/11/2017
Name: ALPENA, THUNDER BAY, LAKE HURON
MI
NOAA Chart: 14864 Latitude: 45° 3.8' N ( 45.06300)
USGS Quad: Longitude: 83° 25.7' W ( -83.42860)
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 5065 MCLELLANS USLS
MONUMENTATION: Chiseled Square VM#: 18365
AGENCY: IDB PID#: QJ0105
SETTING CLASSIFICATION: Set in the foundation of the LG
building. OPUS PID:
LATITUDE: 45° 3.8' N ( 45.06289) LONGITUDE: 83° 25.9' W ( -83.43244)
The bench mark is a chiseled square on the NW side of Second Ave, the highest
point on top of a 1-inch square cut in top of the lowest stone water table, 2.99
m (9.81 ft) East of the NE corner of building, 2.26 m (7.41 ft) SW of a fire
hydrant, 0.15 m (0.49 ft) West of the offset in the building, 0.09 m (0.30 ft)
above the sidewalk.
BENCH MARK STAMPING:
DESIGNATION: 907 5065 REST
MONUMENTATION: Bolt VM#: 18366
AGENCY: IDB PID#: QJ0098
SETTING CLASSIFICATION: Window sill OPUS PID:
LATITUDE: 45° 3.6' N ( 45.05978) LONGITUDE: 83° 25.9' W ( -83.43083)
The bench mark is a bolt on the NW side of Harbor Dr, 27.1 m (88.9 ft) SW of the
centerline of Chisholm St and 22.2 m (72.8 ft) NW of the centerline of Harbor
Dr, 2.7 m (8.9 ft) SW of the NE corner of the city public restroom, 1.3 m (4.3
ft) above the ground, BM being a horizontal line of cross on a brass plug set
into the face of the North window sill.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9075065 PUBLICATION DATE: 08/11/2017
Name: ALPENA, THUNDER BAY, LAKE HURON
MI
NOAA Chart: 14864 Latitude: 45° 3.8' N ( 45.06300)
USGS Quad: Longitude: 83° 25.7' W ( -83.42860)
G R E A T L A K E S B E N C H M A R K S
BENCH MARK STAMPING: KRUEGER 1966
DESIGNATION: 907 5065 KRUEGER
MONUMENTATION: Metal Rod VM#: 18367
AGENCY: National Geodetic Survey IDB PID#: QJ0099
SETTING CLASSIFICATION: Copper-clad steel rod w/o sleeve OPUS PID:
LATITUDE: 45° 3.6' N ( 45.05947) LONGITUDE: 83° 25.8' W ( -83.43019)
The bench mark is a copper-clad steel rod on the SE side of Harbor Dr, 20.39 m
(66.90 ft) SSE of a light pole on the SE side of the curb on Harbor Dr, 1.95 m
(6.40 ft) SW of the edge of a sidewalk, 0.70 m (2.30 ft) NW of the North corner
of building, being a 5/8 inch copper coated steel rod encased in a 5 inch sleeve
and aluminum access lid just below ground level.
BENCH MARK STAMPING: ALPENA 2 1971
DESIGNATION: 907 5065 ALPENA 2
MONUMENTATION: Survey disk VM#: 18368
AGENCY: National Geodetic Survey IDB PID#: QJ0101
SETTING CLASSIFICATION: Top of concrete monument OPUS PID:
LATITUDE: 45° 3.5' N ( 45.05906) LONGITUDE: 83° 25.8' W ( -83.42967)
The bench mark is a disk on the SE side of Harbor Dr, 22.3 m (73 ft) SE of the
NE corner of boat basin, 3.4 m (11 ft) East of the East edge of concrete
sidewalk along the East side of the basin, 3.0 m (10 ft) SE of a concrete light
pole, 1.5 m (5 ft) SW of the SW curb of parking lot, being a survey disk set in
a concrete monument, encased in a 5 inch sleeve with a aluminum access NOS lid
stamped Alpena 2 1971.
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: 9075065 PUBLICATION DATE: 08/11/2017
Name: ALPENA, THUNDER BAY, LAKE HURON
MI
NOAA Chart: 14864 Latitude: 45° 3.8' N ( 45.06300)
USGS Quad: Longitude: 83° 25.7' W ( -83.42860)
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: 9075065 PUBLICATION DATE: 08/11/2017
Name: ALPENA, THUNDER BAY, LAKE HURON
MI
NOAA Chart: 14864 Latitude: 45° 3.8' N ( 45.06300)
USGS Quad: Longitude: 83° 25.7' W ( -83.42860)
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/.