U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9063009 PUBLICATION DATE: 08/11/2017 Name: AMERICAN FALLS, NIAGARA FALLS, NIAGARA R NY NOAA Chart: 14822 Latitude: 43° 4.9' N ( 43.08106) USGS Quad: Longitude: 79° 3.7' W ( -79.06136) TO REACH THE NOS GAUGING STATION AT AMERICAN FALLS, NIAGARA FALLS, NY, FROM THE INTERSECTION OF 190 AND ROBERT MOSES PARKWAY, PROCEED WEST ON ROBERT MOSES PARKWAY FOR 6.3 KM (3.90 MI) AND THE GAUGE HOUSE IS ON THE SOUTH SIDE OF ROBERT MOSES PARKWAY. G R E A T L A K E S B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 3009 F 1990 DESIGNATION: 906 3009 F MONUMENTATION: Tidal Station disk VM#: 12766 AGENCY: National Ocean Service (NOS) IDB PID#: AC6011 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 43° 5.1' N ( 43.08550) LONGITUDE: 79° 3.9' W ( -79.06506) The primary bench mark is a disk located 17.40 m (57.1 ft) W of curb of Robert Moses Parkway, 15.90 m (52.2 ft) N of the drain gate located in Niagara Falls Park, and 13.10 m (43.0 ft) S of face of Korean Conflict Monument. The datum point is set 0.15 m (0.5 ft) below the ground, being crimped to a 5/8-inch stainless steel rod driven 2.7 m (9 ft) to refusal, encased in a 5-inch PVC pipe and concrete kickblock with witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9063009 PUBLICATION DATE: 08/11/2017 Name: AMERICAN FALLS, NIAGARA FALLS, NIAGARA R NY NOAA Chart: 14822 Latitude: 43° 4.9' N ( 43.08106) USGS Quad: Longitude: 79° 3.7' W ( -79.06136) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: V 411 1977 DESIGNATION: V 411 MONUMENTATION: Bench Mark disk VM#: 12767 AGENCY: National Geodetic Survey (NGS) IDB PID#: OG0347 SETTING CLASSIFICATION: Concrete and stone wing wall OPUS PID: LATITUDE: 43° 4.9' N ( 43.08086) LONGITUDE: 79° 3.6' W ( -79.05983) The bench mark is a disk set in top of concrete and stone wing wall located 30.00 m (98.4 ft) SSW of the centerline of the E bound lanes of Robert Moses Parkway, 13.90 m (45.6 ft) SE of the NE corner nearest the door of the hexagonal-shaped NOAA water level gauge house and 3.39 m (11.12 ft) W of E edge of concrete catch basin wall. BENCH MARK STAMPING: FALLS A 1976 DESIGNATION: 906 3009 FALLS A MONUMENTATION: Bench Mark disk VM#: 12768 AGENCY: US Army Corp of Engineers (USACE) IDB PID#: OG0348 SETTING CLASSIFICATION: Gauge House OPUS PID: LATITUDE: 43° 4.9' N ( 43.08106) LONGITUDE: 79° 3.7' W ( -79.06136) The bench mark is set vertically in the upstream side of the hexagonal shaped stone gage house, 12.35 m (40.5 ft) W of the W edge of the concrete catch basin wall, 4.32 m (14.2 ft) S of the centerline of a asphalt walkway running E and W along rivers edge, 0.30 m (1.0 ft) from the NE corner nearest doorway, and 1.20 m (3.9 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9063009 PUBLICATION DATE: 08/11/2017 Name: AMERICAN FALLS, NIAGARA FALLS, NIAGARA R NY NOAA Chart: 14822 Latitude: 43° 4.9' N ( 43.08106) USGS Quad: Longitude: 79° 3.7' W ( -79.06136) G R E A T L A K E S B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 906 3009 GRATE MONUMENTATION: Chiseled Square VM#: 12769 AGENCY: IDB PID#: OG0222 SETTING CLASSIFICATION: Concrete catch basin foundation OPUS PID: LATITUDE: 43° 4.9' N ( 43.08200) LONGITUDE: 79° 3.7' W ( -79.06092) The bench mark is a chiseled square being the highest point in a 1-inch square formed by two chiseled lines on the SE corner of the foundation located 8.70 m (28.5 ft) NE of N curb of Robert Moses Parkway, 3.00 m (9.8 ft) SE of a 25-inch diameter maple tree, and 1.00 m (3.3 ft) S of NE corner of the concrete catch basin foundation. BENCH MARK STAMPING: DESIGNATION: 906 3009 PARK MONUMENTATION: Bolt VM#: 12771 AGENCY: IDB PID#: OG0227 SETTING CLASSIFICATION: Window sill OPUS PID: LATITUDE: 43° 5.2' N ( 43.08672) LONGITUDE: 79° 3.9' W ( -79.06547) The bench mark is a bolt set under the most N window sill in the water table, 37.52m (123.1 ft) W of center falg pole of 3 flag poles that are located in the countyard of Administration Office and Visitors Center, 11.70 m (38.4 ft) N of the centerline of the main entrance to the Administration office, 3.10 m (10.2 ft) S of the NE corner and in E face of administration building, and 0.66 m (2.1 ft) above the ground. 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 4 of 5 Station ID: 9063009 PUBLICATION DATE: 08/11/2017 Name: AMERICAN FALLS, NIAGARA FALLS, NIAGARA R NY NOAA Chart: 14822 Latitude: 43° 4.9' N ( 43.08106) USGS Quad: Longitude: 79° 3.7' W ( -79.06136) 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 5 of 5 Station ID: 9063009 PUBLICATION DATE: 08/11/2017 Name: AMERICAN FALLS, NIAGARA FALLS, NIAGARA R NY NOAA Chart: 14822 Latitude: 43° 4.9' N ( 43.08106) USGS Quad: Longitude: 79° 3.7' W ( -79.06136) 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/.