U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 9063079 PUBLICATION DATE: 08/11/2017 Name: MARBLEHEAD, LAKE ERIE OH NOAA Chart: 14844 Latitude: 41° 32.6' N ( 41.54364) USGS Quad: Longitude: 82° 43.9' W ( -82.73139) TO REACH THE NOS GAUGING STATION, IN MARBLEHEAD, OTTAWA COUNTY, OHIO, FROM THE INTERSECTION OF ROUTE 163 (MAIN ST) AND FRANCES ST, PROCEED NORTH ON FRANCES ST FOR APPROX 0.1 MILE (0.2 KM) TO THE INTERSECTION WITH PRARIE RD, THEN PROCEED EAST ON PRARIE RD FOR APPROX 0.05 MILE (0.08KM) TO THE USCG GATE, THEN PROCEED THRU GATE AND TRAVEL NORTH FOR APPROX 0.1 MILE (0.2 KM) ON PAVED DRIVE TO NORTH END OF PROPERTY, ON THE PROPERTY OF THE U.S. COAST GUARD, NEAR THE BOAT HOIST RAMP AND CONCRETE CAPPED CELLS, TO THE NOS GAUGING STATION. 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 7 Station ID: 9063079 PUBLICATION DATE: 08/11/2017 Name: MARBLEHEAD, LAKE ERIE OH NOAA Chart: 14844 Latitude: 41° 32.6' N ( 41.54364) USGS Quad: Longitude: 82° 43.9' W ( -82.73139) G R E A T L A K E S B E N C H M A R K S PRIMARY BENCH MARK STAMPING: Z 317 1980 DESIGNATION: Z 317 MONUMENTATION: Flange-encased Rod VM#: 12827 AGENCY: National Geodetic Survey IDB PID#: MC0984 SETTING CLASSIFICATION: Stainless steel rod w/o sleeve OPUS PID: LATITUDE: 41° 32.6' N ( 41.54292) LONGITUDE: 82° 43.9' W ( -82.73183) The bench mark is a stainless steel rod set in the grassy area at the NW end of the parking lot on the W side of the Coast Guard building office, 56.3 ft (17.2 m) NW of the NW corner of the building, 28.2 ft (8.6 m) W of the center of the paved road leading down to the boat house and lake, 6.55 m (21.49 ft) N of the NW corner of the paved parking lot, 2.8 m (9.2 ft) Eof a N-S fence line between USCG and ferry landing property. Encased in a 5-inch PVC pipe with aluminum access cover and concrete kick block with witness post, level with the ground. BENCH MARK STAMPING: DESIGNATION: 906 3079 CELL MONUMENTATION: See descriptive text VM#: 12828 AGENCY: IDB PID#: MC0990 SETTING CLASSIFICATION: 2 Chiseled lines on steel pile OPUS PID: LATITUDE: 41° 32.6' N ( 41.54361) LONGITUDE: 82° 43.9' W ( -82.73139) The bench mark is 2 chiseled lines set on the steel cell portion on the E side of the break wall which forms the W side of the boat basin on the N side of the boat house, 21.8 m (71.5 ft) N of the NW corner of the boat house, 7.1 m (23.3 ft) S of the cylindrical pipe for gauge well.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 9063079 PUBLICATION DATE: 08/11/2017 Name: MARBLEHEAD, LAKE ERIE OH NOAA Chart: 14844 Latitude: 41° 32.6' N ( 41.54364) USGS Quad: Longitude: 82° 43.9' W ( -82.73139) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: AMC MARBLEHEAD 1976 DESIGNATION: MARBLEHEAD MONUMENTATION: Survey disk VM#: 12829 AGENCY: National Ocean Survey IDB PID#: MC0991 SETTING CLASSIFICATION: Breakwall OPUS PID: LATITUDE: 41° 32.6' N ( 41.54389) LONGITUDE: 82° 43.9' W ( -82.73150) The bench mark is a disk set atop the W concrete break wall, 14.2 m (46.6 ft) NW of the steel pipe for a water level gage well, 10.3 m (33.8 ft) S of the N end of the break wall, and just N of a U.S Coast Guard sign, set in the surface of the concrete break wall/cell. BENCH MARK STAMPING: 3079 F 1982 DESIGNATION: 906 3079 F MONUMENTATION: Bench Mark disk VM#: 12831 AGENCY: National Ocean Survey IDB PID#: AB6925 SETTING CLASSIFICATION: Concrete ferry slip abutment OPUS PID: LATITUDE: 41° 32.6' N ( 41.54400) LONGITUDE: 82° 43.9' W ( -82.73189) The bench mark is a disk at the Kelly's Island Ferry Dock area, near the water's edge, in SE corner of concrete ferry slip abutment of the most E of tow ferry slips, 13.1 m (43.0 ft) NNW of NW corner post of covered passenger waiting area, 1.60 m (5.25 ft) NW of a power pole and 1.1 m S of the SE leg of steel ramp support.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 9063079 PUBLICATION DATE: 08/11/2017 Name: MARBLEHEAD, LAKE ERIE OH NOAA Chart: 14844 Latitude: 41° 32.6' N ( 41.54364) USGS Quad: Longitude: 82° 43.9' W ( -82.73139) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: 3079 G 1982 DESIGNATION: 906 3079 G MONUMENTATION: Bench Mark disk VM#: 12832 AGENCY: National Ocean Survey IDB PID#: AB6926 SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 41° 32.6' N ( 41.54314) LONGITUDE: 82° 43.9' W ( -82.73114) The bench mark is a disk on the U.S. Coast Guard base, in W side of concrete of sliding door foundation of boathouse garage, 0.6 ft (18.3 cm) E of the most W door jam, being the highest point of line in center of a standard NOS disc set flush in the concrete. BENCH MARK STAMPING: 3079 H 1988 DESIGNATION: 906 3079 H MONUMENTATION: Bench Mark disk VM#: 12833 AGENCY: National Ocean Survey IDB PID#: SETTING CLASSIFICATION: Base of flag/weather vane tower OPUS PID: LATITUDE: 41° 32.5' N ( 41.54181) LONGITUDE: 82° 43.9' W ( -82.73197) The bench mark is a disk on the W side of Frances St, in James Park, in the base of a flag and weather vane tower, 83.30 m (273.29 ft) S of the S side of Prarie Road, 23.30 m (76.44 ft) W of the W edge of Frances St, 4.00 m (13.12 ft) SW of the SW face of VFW American Legion monument, 2.20 m (7.22 ft) E of the W leg of the tower, set flush with the concrete foundation base.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 9063079 PUBLICATION DATE: 08/11/2017 Name: MARBLEHEAD, LAKE ERIE OH NOAA Chart: 14844 Latitude: 41° 32.6' N ( 41.54364) USGS Quad: Longitude: 82° 43.9' W ( -82.73139) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: 3079 J 1993 DESIGNATION: 906 3079 J MONUMENTATION: Bench Mark disk VM#: 12834 AGENCY: National Ocean Service (NOS) IDB PID#: AB6927 SETTING CLASSIFICATION: Stainless steel rod w/o sleeve OPUS PID: LATITUDE: 41° 32.7' N ( 41.54461) LONGITUDE: 82° 43.9' W ( -82.73133) The bench mark is a disk on the U.S. Coast Guard station, 39.8 m (130.6 ft) SW from the SE light pole along the basins SE side, 24.7 m (81.0 ft) SW of the SW corner of the pyrotechnics shelter, 21.7 m (71.2 ft) NNE of the NE corner of a concrete parking area on the N side of the Coast Guard facility building, 9.8 m (32.2 ft) E of the NE corner of the fuel storage building with block foundation, being a standard NOS disc crimped atop a 1/2-inch stainless steel rod 3.7 m (12.1 ft) long driven to refusal with a 5 inch PVC pipe with aluminum NGS logo cover and concrete kick pad flush with the ground, with witness post. BENCH MARK STAMPING: 3079 L RESET 2007 DESIGNATION: 906 3079 L RESET 2007 MONUMENTATION: Bench Mark disk VM#: 18482 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete retaining wall OPUS PID: LATITUDE: 41° 32.6' N ( 41.54353) LONGITUDE: 82° 43.9' W ( -82.73142) The bench mark is a disk on the N end of the U.S. Coast Guard property, near the water's edge, set flush in concrete retaining/headwall near the W side of the boat basin, 15.66 m (51.38 ft) W of the E edge of headwall, 1.15 m (3.77 ft) S of the N edge of headwall, 0.26 m (0.85 ft) E of the W edge of headwall, being the highest point of a bronze survey disk set flush with the concrete. 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: 9063079 PUBLICATION DATE: 08/11/2017 Name: MARBLEHEAD, LAKE ERIE OH NOAA Chart: 14844 Latitude: 41° 32.6' N ( 41.54364) USGS Quad: Longitude: 82° 43.9' W ( -82.73139) 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: 9063079 PUBLICATION DATE: 08/11/2017 Name: MARBLEHEAD, LAKE ERIE OH NOAA Chart: 14844 Latitude: 41° 32.6' N ( 41.54364) USGS Quad: Longitude: 82° 43.9' W ( -82.73139) 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/.