U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9087044 PUBLICATION DATE: 08/11/2017 Name: CALUMET HARBOR, LAKE MICHIGAN IL NOAA Chart: 14929 Latitude: 41° 43.8' N ( 41.72972) USGS Quad: Longitude: 87° 32.3' W ( -87.53833) TO REACH THE NOS GAUGING STATION, IN COOK COUNTY, CHICAGO, ILLINOIS, (FIRST CHECK IN AT GUARD STATION FOR LAKE SIDE MARKETING). TO REACH LAKE SIDE MARKETING, FROM INTERSECTION OF 87TH AND BURLEY (3432) AVE. TURN NORTH ON BURLEY ST AND GO TO 86TH ST. TURN EAST AND GO TO END (SOUTH GREEN BAY AVE AND E 86TH ST). GUARD WILL HELP YOU. TO GO STRAIGHT TO STATION, FROM INTERSECTION OF (3432) LAKE SHORE DR.(HWY N41)AND 87TH ST. PROCEED EAST ON 87TH, GATE TO STATION IS (N41 44' 24.9",W087 32' 18.9"), IS FIRST DIRT RD (APPOX 40 YARDS), ON RIGHT (WITH AN ARMY CORP OF ENGINEERS SIGN ON FENCE). THEN FOLLOW GRAVEL ROAD WEST (RIGHT) APPROXIMATELY 0.4 KM (0.25 MI) TO SECONDARY GATE (OR FIRST RIGHT), PROCEED SOUTH (RIGHT) ALONG SECONDARY GRAVEL ROAD APPROXIMATELY 0.2 KM (0.12 MI) TO GAUGE SITE. G R E A T L A K E S B E N C H M A R K S PRIMARY BENCH MARK STAMPING: COM 1958 DESIGNATION: 908 7044 COM MONUMENTATION: Metal Rod VM#: 13199 AGENCY: National Geodetic Survey IDB PID#: ME2189 SETTING CLASSIFICATION: Metal rod driven into the ground OPUS PID: LATITUDE: 41° 43.8' N ( 41.73011) LONGITUDE: 87° 32.3' W ( -87.53881) The bench mark is a metal rod 116.3m (381.6 ft) East of the extended center of the avenue, 11.2m (36.7 ft) South of the extended center of the street, 4.70m (15.42 ft) SW of the center of a driveway, 4.27m (14.01 ft) NNE of a telephone pole, 3.10m (10.17 ft) SE of the North corner of the foundation of a razed building, and 0.70m (2.30 ft) NE of the foundation. Note - the datum point is the top of a 1-inch metal rod that is recessed 0.3 m (1.0 ft) below the ground surface.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9087044 PUBLICATION DATE: 08/11/2017 Name: CALUMET HARBOR, LAKE MICHIGAN IL NOAA Chart: 14929 Latitude: 41° 43.8' N ( 41.72972) USGS Quad: Longitude: 87° 32.3' W ( -87.53833) 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 7044 REP MONUMENTATION: Bolt VM#: 13200 AGENCY: IDB PID#: ME2190 SETTING CLASSIFICATION: Tower base OPUS PID: LATITUDE: 41° 43.8' N ( 41.72981) LONGITUDE: 87° 32.3' W ( -87.53889) The bench mark is a bolt 97.5m (319.9 ft) East of the extended center of the avenue, 45.4m (148.9 ft) South of the extended center of the street, 21.7m (71.2 ft) NNW of the center of a paved road parallel to the Calumet River, 10.5m (34.4 ft) WSW of the SW edge of a foundation of a razed building, 1.2m (3.9 ft) NW of the tower leg, 0.4m (1.3 ft) SE of the NW corner of the concrete footing for the NE leg of a high line tower, being a 3/8 inch bolt set in the concrete footing.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9087044 PUBLICATION DATE: 08/11/2017 Name: CALUMET HARBOR, LAKE MICHIGAN IL NOAA Chart: 14929 Latitude: 41° 43.8' N ( 41.72972) USGS Quad: Longitude: 87° 32.3' W ( -87.53833) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: M 274 1973 DESIGNATION: M 274 MONUMENTATION: Vertical Control disk VM#: 13201 AGENCY: National Geodetic Survey IDB PID#: ME1966 SETTING CLASSIFICATION: Retaining wall - bulkhead OPUS PID: LATITUDE: 41° 43.8' N ( 41.72992) LONGITUDE: 87° 32.3' W ( -87.53797) The bench mark is a disk 172.0m (564.3 ft) East of the extended center of the avenue, 67.9m (222.8 ft) South of the extended center of the street, 9.9m (32.5 ft) NE of the NE side of a Corp of Engineers boat ramp, 1.9m (6.2 ft) SW of the SW end of a concrete retaining wall bulkhead along a US Steel Corp slip, 1.6m (5.2 ft) South of the most southerly mooring post and set in the top of concrete retaining wall. BENCH MARK STAMPING: DESIGNATION: 908 7044 BOLT MONUMENTATION: Bolt VM#: 13203 AGENCY: IDB PID#: AC8298 SETTING CLASSIFICATION: Concrete gauge house floor OPUS PID: LATITUDE: 41° 43.8' N ( 41.72986) LONGITUDE: 87° 32.3' W ( -87.53839) The bench mark is a bolt just inside East side of doorway of NOS gauging station, 1.74m (5.71 ft) North of the South interior wall of the gauge house, 0.79m (2.59 ft) East of the West edge of the door frame, 0.27m (0.89 ft) West of the East interior wall of the gauge house, being highest point of hexagon bolt set into concrete floor of gauge house.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9087044 PUBLICATION DATE: 08/11/2017 Name: CALUMET HARBOR, LAKE MICHIGAN IL NOAA Chart: 14929 Latitude: 41° 43.8' N ( 41.72972) USGS Quad: Longitude: 87° 32.3' W ( -87.53833) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: 7044 H 1995 DESIGNATION: 908 7044 H MONUMENTATION: Bench Mark disk VM#: 18321 AGENCY: National Ocean Service (NOS) IDB PID#: AE9231 SETTING CLASSIFICATION: Stainless steel rod w/o sleeve OPUS PID: LATITUDE: 41° 43.8' N ( 41.72983) LONGITUDE: 87° 32.3' W ( -87.53844) The bench mark is a disk 34.7m (113.8 ft) South of the SW corner of the U.S. Army Engineers District Field Building (with four bay doors), 9.2m (30.2 ft) West of the SW corner of steel bulkhead, 1.3m (4.3 ft) South of the NW corner of the NOS gauge house, being stainless steel rod driven 12.2m (40.0 ft) to refusal, encased in 5" PVC sleeve with concrete kick-block with aluminum access cover with witness post. BENCH MARK STAMPING: 7044 J 2002 DESIGNATION: 908 7044 J MONUMENTATION: Survey disk VM#: 18322 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 41° 43.8' N ( 41.72989) LONGITUDE: 87° 32.3' W ( -87.53822) The bench mark is a disk 15.30m (50.20 ft) East from East corner of the NE face of the gage house, 6.64m (21.78 ft) SW of the South face of the boat launch, 5.50m (18.04 ft) West of the 2nd yellow bollard from the North along the face of the bulkhead that lies East of the gauge house, set in Rohn tower concrete foundation, being a brass survey disk set into a 5ft by 5ft concrete pad that is 6ft deep, which has a Rohn tower secured into it and aluminum stand with Henasee box. 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: 9087044 PUBLICATION DATE: 08/11/2017 Name: CALUMET HARBOR, LAKE MICHIGAN IL NOAA Chart: 14929 Latitude: 41° 43.8' N ( 41.72972) USGS Quad: Longitude: 87° 32.3' W ( -87.53833) 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: 9087044 PUBLICATION DATE: 08/11/2017 Name: CALUMET HARBOR, LAKE MICHIGAN IL NOAA Chart: 14929 Latitude: 41° 43.8' N ( 41.72972) USGS Quad: Longitude: 87° 32.3' W ( -87.53833) 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/.