Bench Mark Sheet for 9075080, Mackinaw City MI

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  6

                                                                                
Station ID: 9075080                         PUBLICATION DATE:  08/11/2017
Name:       MACKINAW CITY, STRAITS OF MACKINAC                
            MI
NOAA Chart: 14881                           Latitude:   45° 46.7' N (  45.77789)
USGS Quad:                                  Longitude:  84° 43.5' W ( -84.72533)


TO REACH THE NOS GAUGE HOUSE, IN MACKINAW CITY, CHEBOYGAN COUNTY, MICHIGAN, FROM
THE INTERSECTION OF HURON AVE AND RAILROAD AVE, PROCEED EAST ON RAILROAD AVE FOR
APPROX 0.48 KM (0.30 MI) TO THE ARNOLD FERRY DOCK LANDING,THE NOS WATER LEVEL
GAUGE HOUSE IS LOCATED AT THE FORMER STATE FERRY DOCK.


                    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  6

                                                                                
Station ID: 9075080                         PUBLICATION DATE:  08/11/2017
Name:       MACKINAW CITY, STRAITS OF MACKINAC                
            MI
NOAA Chart: 14881                           Latitude:   45° 46.7' N (  45.77789)
USGS Quad:                                  Longitude:  84° 43.5' W ( -84.72533)


                    G R E A T  L A K E S   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  J 299 1983
                         DESIGNATION:          J 299

MONUMENTATION:           Flange-encased Rod                    VM#:        13068
AGENCY:                  National Geodetic Survey              IDB PID#:  QK0428
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   45° 46.7' N (  45.77808)          LONGITUDE:  84° 43.6' W ( -84.72658)


The bench mark is a stainless steel rod 17.98 m (58.99 ft) West of the
centerline of Huron Avenue, 12.19 m (39.99 ft) North of the center of Railroad
Avenue, 5.1m (16.5 ft) SE of the SE corner of the Mackinaw Island Fudge Company,
4.02 m (13.19 ft) South of the South edges of an East-West sidewalk, 3.10m
(10.17 ft) East of the East edge of a North-South sidewalk, 3.1m (10.2 ft) East
of the East edge of a North-South sidewalk, 1.52m (4.99 ft) East of the North
metal post supporting a sign (line up for the ferry) , protected by PVC sleeve,
alum access lid and witness post.



                         BENCH MARK STAMPING:   
                         DESIGNATION:          907 5080 STATE DOCK

MONUMENTATION:           Not specified (see descriptive text)  VM#:        13069
AGENCY:                  US Lakes Survey                       IDB PID#:  QK0258
SETTING CLASSIFICATION:  Railroad rail                         OPUS PID:        
LATITUDE:   45° 46.7' N (  45.77783)          LONGITUDE:  84° 43.2' W ( -84.72008)


The bench mark is on North side of the former state ferry dock, 37.49m (123.00
ft) West of gauge house, 3.35m (10.99 ft) South of the inside edge of concrete
wall along North side of dock, 0.45m (1.48 ft) South of the North curb of road,
0.3 m (1.0 ft) below the pavement, encased in a 6-inch diameter iron pipe with a
9-inch diameter metal cover, being highest point on top of end of a railroad
rail (highest point being on south side of head of the rail).

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 9075080                         PUBLICATION DATE:  08/11/2017
Name:       MACKINAW CITY, STRAITS OF MACKINAC                
            MI
NOAA Chart: 14881                           Latitude:   45° 46.7' N (  45.77789)
USGS Quad:                                  Longitude:  84° 43.5' W ( -84.72533)


                    G R E A T  L A K E S   B E N C H   M A R K S


                         BENCH MARK STAMPING:  5080 G 1991
                         DESIGNATION:          907 5080 G

MONUMENTATION:           Bench Mark disk                       VM#:        13071
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AC6039
SETTING CLASSIFICATION:  Bulkhead Retaining Wall (Cap)         OPUS PID:        
LATITUDE:   45° 46.6' N (  45.77731)          LONGITUDE:  84° 43.3' W ( -84.72094)


The bench mark is a disk on the state dock and fishing pier, 30.0m (98.4 ft) NW
of SE corner of seawall of state dock, 5.0m (16.4 ft) East of the West end of
the concrete retaining wall, 0.5m (1.6 ft) SW of the NE face of the concrete
seawall at the in-shore end of city fishing pier, set horizontally in concrete
seawall, 0.4m (1.3 ft) above ground level.



                         BENCH MARK STAMPING:  5080 H 1993
                         DESIGNATION:          907 5080 H

MONUMENTATION:           Bench Mark disk                       VM#:        13072
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AC6040
SETTING CLASSIFICATION:  Cap of Pier                           OPUS PID:        
LATITUDE:   45° 46.6' N (  45.77714)          LONGITUDE:  84° 43.2' W ( -84.72050)


The bench mark is a disk on the state dock and city fishing pier, on South side
of city fishing pier, 5.49m (18.01 ft) SW of North most of two small bollards on
pier deck, 4.14m (13.58 ft) South of utility pole, 2.19m (7.19 ft) WNW of pier
safety ladder from deck of pier to water surface, set flush with deck surface.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 9075080                         PUBLICATION DATE:  08/11/2017
Name:       MACKINAW CITY, STRAITS OF MACKINAC                
            MI
NOAA Chart: 14881                           Latitude:   45° 46.7' N (  45.77789)
USGS Quad:                                  Longitude:  84° 43.5' W ( -84.72533)


                    G R E A T  L A K E S   B E N C H   M A R K S


                         BENCH MARK STAMPING:  MACKINAW CITY 2008
                         DESIGNATION:          9075080 MACKINAW CITY

MONUMENTATION:           Bench Mark disk                       VM#:        18967
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Gauge House Foundation                OPUS PID:        
LATITUDE:   45° 46.6' N (  45.77744)          LONGITUDE:  84° 43.3' W ( -84.72100)


The bench mark is a disk 1.78 m (5.84 ft) NE of the SW corner of concrete
foundation of gauge house, 1.07m (3.51 ft) NW of the West face of white NOS
gauge house wall, 0.8m (2.6 ft) SW of the North corner of concrete foundation of
gauge house, being a brass disc set in the gauge house foundation.





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  5 of  6

                                                                                
Station ID: 9075080                         PUBLICATION DATE:  08/11/2017
Name:       MACKINAW CITY, STRAITS OF MACKINAC                
            MI
NOAA Chart: 14881                           Latitude:   45° 46.7' N (  45.77789)
USGS Quad:                                  Longitude:  84° 43.5' W ( -84.72533)


                             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  6 of  6

                                                                                
Station ID: 9075080                         PUBLICATION DATE:  08/11/2017
Name:       MACKINAW CITY, STRAITS OF MACKINAC                
            MI
NOAA Chart: 14881                           Latitude:   45° 46.7' N (  45.77789)
USGS Quad:                                  Longitude:  84° 43.5' W ( -84.72533)


                             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/.


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