U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 9087096 PUBLICATION DATE: 08/11/2017 Name: PORT INLAND, LAKE MICHIGAN MI NOAA Chart: 14911 Latitude: 45° 58.2' N ( 45.96989) USGS Quad: Longitude: 85° 52.3' W ( -85.87150) TO REACH THE NOS GAUGING STATION, IN THE VILLAGE OF GULLIVER, SCHOOLCRAFT COUNTY, MICHIGAN, FROM THE INTERSECTION OF US HWY 2 AND ROUTE 432 (PORT INLAND RD), PROCEED SOUTH ON 432 (PORT INLAND RD) INTO THE PLANT PROPERTY FOR APPROX 13.44 KM (8.35 MI) TO THE NOS GAUGE HOUSE ON THE PROPERTY OF SPECIALTY MINERALS, INC., (OLD PORT INLAND LIME AND STONE CO.), AT THE NORTHWEST CORNER OF THE HARBOR, AT THE NORTH END OF A BOAT SLIP. G R E A T L A K E S B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7096 F 1979 DESIGNATION: 908 7096 F MONUMENTATION: Survey disk VM#: 13238 AGENCY: National Ocean Survey IDB PID#: AC8316 SETTING CLASSIFICATION: Flag pole base OPUS PID: LATITUDE: 45° 58.3' N ( 45.97142) LONGITUDE: 85° 52.3' W ( -85.87247) The bench mark is a disk on the East side of the road in front of Specialty Minerals Inc. office building, (Old Port Inland Lime and Stone Co.) In the flag pole base, 4.9 m (16.1 ft) West of the inner face of West curb, 1.54 m (5.05 ft) South of the South edge of a sidewalk, 0.25 m (0.82 ft) SE of the East face of the flag pole, 0.17 m (0.56 ft) NW of the SE corner of the concrete foundation.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 9087096 PUBLICATION DATE: 08/11/2017 Name: PORT INLAND, LAKE MICHIGAN MI NOAA Chart: 14911 Latitude: 45° 58.2' N ( 45.96989) USGS Quad: Longitude: 85° 52.3' W ( -85.87150) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: 7096 G 1981 DESIGNATION: 908 7096 G MONUMENTATION: Survey disk VM#: 13239 AGENCY: National Ocean Survey IDB PID#: AC8317 SETTING CLASSIFICATION: 72FT X 35FT CONCRETE PLATFORM OPUS PID: LATITUDE: 45° 58.2' N ( 45.97047) LONGITUDE: 85° 52.4' W ( -85.87392) The bench mark is a disk on the property of Specialty Minerals, Inc., (Old Port Inland Lime and Stone Co.), located at the West side and near the SW corner of the oil house (building no. 9) , on a 72ft x 35ft concrete storage platform, 10.65 m (34.94 ft) North of the South corner of the building, 0.8 m (2.6 ft) North of the steps leading to building, 0.15 m (0.49 ft) West of the East face of the building, with witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 9087096 PUBLICATION DATE: 08/11/2017 Name: PORT INLAND, LAKE MICHIGAN MI NOAA Chart: 14911 Latitude: 45° 58.2' N ( 45.96989) USGS Quad: Longitude: 85° 52.3' W ( -85.87150) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: 7096 J 1998 DESIGNATION: 908 7096 J MONUMENTATION: Flange-encased Rod VM#: 18314 AGENCY: National Geodetic Survey IDB PID#: DJ5177 SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 45° 58.3' N ( 45.97247) LONGITUDE: 85° 52.3' W ( -85.87247) The benchmark is a stainless steel rod 47.75 m (156.66 ft) South of first power pole North of the closest entrance to gravel yard area behind admin bldg (referred to as Gate 3), power pole is unnumbered but the face of pole is marked with stainless steel washer and nail, 26.27 m (86.19 ft) North of centerline of the closest entrance drive to the gravel yard area behind the admin bldg (referred to as Gate 3), 19.35 m (63.48 ft) South of the first telephone pole North of the Gate 3 entrance, 9.00m (29.53 ft) West of centerline of Port Inland Road 432, 3.35 m (10.99 ft) North from (road ends) pole, 2.55 m (8.37 ft) East from water's edge of ditch line, set in PVC sleeve with aluminum access lid and witness post. BENCH MARK STAMPING: 7096 H RESET 2001 DESIGNATION: 908 7096 H RESET 2001 MONUMENTATION: Bench Mark disk VM#: 18315 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete bulkhead OPUS PID: LATITUDE: 45° 58.1' N ( 45.96839) LONGITUDE: 85° 52.3' W ( -85.87203) The bench mark is a disk on the property of Specialty Minerals, Inc., (Old Port Inland Lime and Stone Co.), 167.6 m (549.9 ft) South of the NW corner of the harbor, 13.4 m (44.0 ft) East of the most North leg of a conveyor station, 4.2 m (13.8 ft) North of the North rail leading to the conveyor station, 1.0 m (3.3 ft) West of the bulkhead face, set flush in top of concrete bulkhead.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 9087096 PUBLICATION DATE: 08/11/2017 Name: PORT INLAND, LAKE MICHIGAN MI NOAA Chart: 14911 Latitude: 45° 58.2' N ( 45.96989) USGS Quad: Longitude: 85° 52.3' W ( -85.87150) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: 7096 K 2004 DESIGNATION: 908 7096 K MONUMENTATION: Flange-encased Rod VM#: 18316 AGENCY: National Geodetic Survey IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 45° 58.5' N ( 45.97439) LONGITUDE: 85° 52.3' W ( -85.87219) The bench mark is a stainless steel rod 8.60 m (28.22 ft) East of the centerline of 432 (Port Inland Rd), then 5.39 m (17.68 ft) East of the East edge of Port Inland Rd, 3.40 m (11.15 ft) South of the face of a power pole MC-1195, NPSK-S, WQO, marked with a nail and S/S washer on the South side of pole, 0.20 m (0.66 ft) West of a witness post protected with a PVC sleeve, stamped alum access lid and witness post. BENCH MARK STAMPING: 908 7096 L 2006 DESIGNATION: 908 7096 L MONUMENTATION: Bench Mark disk VM#: 18317 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Tower foundation OPUS PID: LATITUDE: 45° 58.1' N ( 45.96828) LONGITUDE: 85° 52.1' W ( -85.86886) The bench mark is a disk on the property of O-N Minerals Inc., (Old Port Inland Lime and Stone Co.) at the SE corner of the harbor, near the SE end of spit of land, set in the top of the NOAA MET tower foundation, 1.67 m (5.47 ft) NE of the SW corner of the met tower foundation, 1.15 m (3.77 ft) NW of the NE corner of the met tower foundation, 0.25 m (0.81 ft) South of the North corner of the met tower foundation.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 9087096 PUBLICATION DATE: 08/11/2017 Name: PORT INLAND, LAKE MICHIGAN MI NOAA Chart: 14911 Latitude: 45° 58.2' N ( 45.96989) USGS Quad: Longitude: 85° 52.3' W ( -85.87150) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 908 7096 CAP MONUMENTATION: Not specified (see descriptive text) VM#: 18318 AGENCY: IDB PID#: SETTING CLASSIFICATION: Steel bulkhead cap OPUS PID: LATITUDE: 45° 58.2' N ( 45.96989) LONGITUDE: 85° 52.3' W ( -85.87139) The bench mark is on the property of Specialty Minerals, Inc., (Old Port Inland Lime and Stone Co.), at the NW corner of the harbor, at the North end of boat slip area, 5.7m (18.70 ft) West of the West edge of first East bollard from gauge house, 3.09m (10.14 ft) Est of the East gauge house wall, 0.69m (2.26 ft) East of the East side of bollard, 0.04m (0.12 ft) South of the North edge of the steel bulkhead cap, being the high point on steel bulkhead cap created with a grinder. 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: 9087096 PUBLICATION DATE: 08/11/2017 Name: PORT INLAND, LAKE MICHIGAN MI NOAA Chart: 14911 Latitude: 45° 58.2' N ( 45.96989) USGS Quad: Longitude: 85° 52.3' W ( -85.87150) 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: 9087096 PUBLICATION DATE: 08/11/2017 Name: PORT INLAND, LAKE MICHIGAN MI NOAA Chart: 14911 Latitude: 45° 58.2' N ( 45.96989) USGS Quad: Longitude: 85° 52.3' W ( -85.87150) 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/.