U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8311062 PUBLICATION DATE: 08/11/2017 Name: ALEXANDRIA BAY, ST. LAWRENCE NY NOAA Chart: 14772 Latitude: 44° 19.9' N ( 44.33111) USGS Quad: Longitude: 75° 56.1' W ( -75.93453) TO REACH THE NOS GAUGING STATION ON WELLESLEY ISLAND, JEFFERSON COUNTY, NEW YORK, FROM THE INTERSECTION OF ISLAND ROAD AND LANDON ROAD, PROCEED 1.13 KM (0.70 MILES) SOUTH ON LANDON ROAD TO THE ALEXANDRIA BAY COAST GUARD STATION, STATION IS LOCATED ON THE COAST GUARD PROPERTY. G R E A T L A K E S B E N C H M A R K S PRIMARY BENCH MARK STAMPING: LAND 1981 DESIGNATION: 831 1062 LAND MONUMENTATION: Bench Mark disk VM#: 116 AGENCY: National Ocean Survey IDB PID#: AH7263 SETTING CLASSIFICATION: OPUS PID: LATITUDE: 44° 19.9' N ( 44.33108) LONGITUDE: 75° 56.3' W ( -75.93883) The bench mark is a disk 28.0 m (92.0 feet) E of centerline of junction of Landon and road To station, 11.3 m (37.1 feet) E of E end of a 12-foot oval stone flower bed, 3.81 m (12.50 feet) SE of the centerline of road leading to Coast Guard base, a disk set into a drill hole in bedrock on the S side of the road, 0.3 m (1 foot) above road leading to station. BENCH MARK STAMPING: 1062 E 1991 DESIGNATION: 831 1062 E MONUMENTATION: Bench Mark disk VM#: 109 AGENCY: National Ocean Service IDB PID#: AH7267 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 44° 19.9' N ( 44.33233) LONGITUDE: 75° 56.4' W ( -75.94025) The bench mark is a disk crimped to a stainless steel rod driven 4.9 m (16 feet) to refusal 47.9 m (157.0 feet) SE of driveway leading to private property of Capt. Frank, 5.6 m (18.5 feet) NE of centerline of Landon Road, 0.76 m (2.5 feet) W of NYT power pole number 7, 0.5 m (1.5 feet) WNW of orange witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 8 Station ID: 8311062 PUBLICATION DATE: 08/11/2017 Name: ALEXANDRIA BAY, ST. LAWRENCE NY NOAA Chart: 14772 Latitude: 44° 19.9' N ( 44.33111) USGS Quad: Longitude: 75° 56.1' W ( -75.93453) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: 1062 D 1984 DESIGNATION: 831 1062 D MONUMENTATION: Bench Mark disk VM#: 110 AGENCY: National Ocean Survey (NOS) IDB PID#: AH7266 SETTING CLASSIFICATION: In bedrock OPUS PID: LATITUDE: 44° 19.9' N ( 44.33167) LONGITUDE: 75° 56.2' W ( -75.93619) The bench mark is a disk 15.5 m (50.9 feet) NNE of center of main Coast Guard driveway, 9.8 m (32.2 feet) SE of SW corner and 6.9 m (22.7 feet) S of SE corner of four car garage, 6.9 m (22.8 feet) NE of N corner of culvert on NW side on driveway to garage. BENCH MARK STAMPING: 1062 A 1981 DESIGNATION: 831 1062 A MONUMENTATION: Bench Mark disk VM#: 111 AGENCY: National Ocean Survey IDB PID#: AH7268 SETTING CLASSIFICATION: OPUS PID: LATITUDE: 44° 19.9' N ( 44.33114) LONGITUDE: 75° 56.1' W ( -75.93450) The bench mark is a disk 9.6 m (31.5 feet) E of bottom step of steps from station headquarters leading down to dock, 6.7 m(21.9 feet) SW of top step of three steps at S end of boat dock, 7.3 m (23.8 feet) NW of flagpole base.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8311062 PUBLICATION DATE: 08/11/2017 Name: ALEXANDRIA BAY, ST. LAWRENCE NY NOAA Chart: 14772 Latitude: 44° 19.9' N ( 44.33111) USGS Quad: Longitude: 75° 56.1' W ( -75.93453) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: 1062 C 1981 DESIGNATION: 831 1062 C MONUMENTATION: Bench Mark disk VM#: 112 AGENCY: National Ocean Survey IDB PID#: AH7265 SETTING CLASSIFICATION: OPUS PID: LATITUDE: 44° 20.0' N ( 44.33269) LONGITUDE: 75° 56.1' W ( -75.93458) The bench mark is a disk is 82.3 m (270 feet) N of the headquarters building, at a sharp curve in driveway leading from headquarters building to residential area, 4.43 m (14.55 feet) N of N edge of driveway, 9.2 m (30.1 feet) SSE of a stone bulkhead that runs E-W , 2.80 m (9.2 feet) E of the center of top step of stone steps leading down to a shingled boathouse. BENCH MARK STAMPING: GOLF 1981 DESIGNATION: 831 1062 GOLF MONUMENTATION: Bench Mark disk VM#: 266 AGENCY: National Ocean Survey (NOS) IDB PID#: AH7264 SETTING CLASSIFICATION: OPUS PID: LATITUDE: 44° 20.1' N ( 44.33436) LONGITUDE: 75° 56.7' W ( -75.94469) The bench mark is a disk 118.9 m (390 feet) WNW of the junction of Island and Landon Roads (Landon Road leads SE to the Alexandria Bay Coast Guard Station), 31.1 m (102 feet) NW of centerline of Island Road, 27.0 m (88.5 feet) NNW of NYT pole number 41 (combined telephone/electric), 27.1 m (89.0 feet) ESE of SE corner of number 8 tee.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8311062 PUBLICATION DATE: 08/11/2017 Name: ALEXANDRIA BAY, ST. LAWRENCE NY NOAA Chart: 14772 Latitude: 44° 19.9' N ( 44.33111) USGS Quad: Longitude: 75° 56.1' W ( -75.93453) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: L.M.N. 1998 DESIGNATION: 831 1062 LMN. MONUMENTATION: Bench Mark disk VM#: 16981 AGENCY: National Ocean Service (NOS) IDB PID#: DE7816 SETTING CLASSIFICATION: Drill hole in rock outcrop OPUS PID: LATITUDE: 44° 19.4' N ( 44.32294) LONGITUDE: 75° 57.4' W ( -75.95667) The bench mark is a disk 77.11 m (253.00 ft) E of the center line of Deer Point Road, 16.9 m (55.3 ft) N of the center line of Island Road, 8.0 m (26.3 ft) WSW of nail and washer in 6 inch tree, 0.7 m (2.2 ft) S of witness post set in rock, in top of a 5'x 6' exposed 8" above ground section of rock outcropping,0.6 m (2.0 ft) below the level of the road. BENCH MARK STAMPING: DEE 1981 DESIGNATION: 831 1062 DEE MONUMENTATION: Bench Mark disk VM#: 16982 AGENCY: National Ocean Survey IDB PID#: DG7149 SETTING CLASSIFICATION: OPUS PID: LATITUDE: 44° 18.4' N ( 44.30739) LONGITUDE: 75° 59.2' W ( -75.98736) The bench mark is a disk 27.0 m (88.6 ft) ENE of the center line of county route 191, 21.8 m (71.5 ft) WNW of county route 100 (Island Road), 12.2 m (40.0 ft) SSW of NYT pole no. 6, 0.5 m (1.5 ft) SE of a witness post, in top of and flush with the ground of an exposed section of rock outcropping.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8311062 PUBLICATION DATE: 08/11/2017 Name: ALEXANDRIA BAY, ST. LAWRENCE NY NOAA Chart: 14772 Latitude: 44° 19.9' N ( 44.33111) USGS Quad: Longitude: 75° 56.1' W ( -75.93453) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: JAMISON 1981 DESIGNATION: 831 1062 JAMISON MONUMENTATION: Bench Mark disk VM#: 16984 AGENCY: National Ocean Survey IDB PID#: DG7148 SETTING CLASSIFICATION: OPUS PID: LATITUDE: 44° 18.8' N ( 44.31264) LONGITUDE: 75° 58.5' W ( -75.97439) The bench mark is a disk 53.2 m (174.5 ft) S of and across section of Old Island Road from center line of county route 100 (Island Road), 27.4 m (90.0 ft) SSW and across old section of Island Road from NYT pole no. 21, 16.2 m (53.0 ft) S of center of double yellow lines in section of Old Island Road, 7.2 m (23.6 ft) E of a nail and washer in face of 12 inch black oak tree, 1.1 m (3.5 ft) NW of nail and washer in face of a 8 inch cedar tree, 10.3 m (33.9 ft) S of a witness post, 0.5 m (1.5 ft) above the level of the old road and in the base of a large section of rock outcropping. BENCH MARK STAMPING: 1062 F 2016 DESIGNATION: 831 1062 F MONUMENTATION: Bench Mark disk VM#: 21955 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete fuel tank foundation OPUS PID: LATITUDE: 44° 19.9' N ( 44.33172) LONGITUDE: 75° 56.1' W ( -75.93522) The bench mark is a disc set in a 3.7m (12.14 ft) x 6.25m (20.51 ft) concrete pad with a heating oil tank, flush with the ground, 36.0 m (118.1 ft) ENE of the Northernmost corner of a boat shop building, 24.4m (80.05 ft) South of the Easternmost corner of a wooden shack on the boat ramp access road, 20.55m (67.42 ft) NE of the NW corner of a workout/gym building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8311062 PUBLICATION DATE: 08/11/2017 Name: ALEXANDRIA BAY, ST. LAWRENCE NY NOAA Chart: 14772 Latitude: 44° 19.9' N ( 44.33111) USGS Quad: Longitude: 75° 56.1' W ( -75.93453) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: 1062 G 2016 DESIGNATION: 831 1062 G MONUMENTATION: Bench Mark disk VM#: 21956 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock outcrop OPUS PID: LATITUDE: 44° 19.9' N ( 44.33200) LONGITUDE: 75° 56.2' W ( -75.93681) The bench mark is a disc set in an outcrop of exposed bedrock, 45.4m (148.95 ft) ENE of the Northernmost corner of a coast guard sign, 29.3m (96.13 ft) North of the Northernmost corner of a basketball court, 6.92m (22.7 ft) SE of a 1.65m (5.4 ft) tall stone fence. BENCH MARK STAMPING: 1062 H 2016 DESIGNATION: 831 1062 H MONUMENTATION: Bench Mark disk VM#: 21957 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: OPUS PID: LATITUDE: 44° 19.9' N ( 44.33150) LONGITUDE: 75° 56.2' W ( -75.93747) The bench mark is a disc set in exposed bedrock, 43.05m (141.24 ft) WSW of the southernmost edge of a coast guard sign, 15.2m (53.15 ft) SSW of the southernmost edge of a USCG gate, 13.6m (44.61 ft) South of the NE-most end post of a 2.05m (6.73 ft) tall stone fence. 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 7 of 8 Station ID: 8311062 PUBLICATION DATE: 08/11/2017 Name: ALEXANDRIA BAY, ST. LAWRENCE NY NOAA Chart: 14772 Latitude: 44° 19.9' N ( 44.33111) USGS Quad: Longitude: 75° 56.1' W ( -75.93453) 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 8 of 8 Station ID: 8311062 PUBLICATION DATE: 08/11/2017 Name: ALEXANDRIA BAY, ST. LAWRENCE NY NOAA Chart: 14772 Latitude: 44° 19.9' N ( 44.33111) USGS Quad: Longitude: 75° 56.1' W ( -75.93453) 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/.