U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  8

                                                                                
Station ID: 9063028                         PUBLICATION DATE:  08/11/2017
Name:       STURGEON POINT, LAKE ERIE                         
            NY
NOAA Chart: 14822                           Latitude:   42° 41.5' N (  42.69131)
USGS Quad:  ANGOLA                          Longitude:  79°  2.8' W ( -79.04733)


TO REACH THE NOS GAUGING STATION AT STURGEON POINT, ERIE COUNTY, NEW YORK,
JERUSALEM CORNERS, FROM THE INTERSECTION OF STATE ROUTE 5 AND STURGEON POINT
ROAD, PROCEED WEST ON STURGEON POINT RD FOR APPROX 3.06 KM (1.9 MILES). THE NOS
GAUGING STATION IS LOCATED IN STURGEON POINT MARINA ON THE SW CORNER OF
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:   
                         DESIGNATION:          906 3028 WATER

MONUMENTATION:           Flange-encased Rod                    VM#:        12796
AGENCY:                  National Geodetic Survey              IDB PID#:  NC0430
SETTING CLASSIFICATION:  Galvanized steel pipe in sleeve       OPUS PID:        
LATITUDE:   42° 41.1' N (  42.68533)          LONGITUDE:  79°  2.3' W ( -79.03889)


The bench mark is a galvanized steel pipe 65.5 m (214.9 ft) NW of y-intersection
of Sturgeon Point Road and Larkin Road, 14.9 m (48.9 ft) NE of centerline of
Sturgeon Point Road, 8.6 m (28.2 ft) SE of the N most 8-inch diameter steel sign
post, 6.8 m (22.3 ft) NW of S fence corner, 4.3 m (14.1 ft) SE of entrance
drive, 2.7 m (8.9 ft) S of 8-inch diameter steel sign post, 2.0 m (6.6 ft) WNW
of the center of a 54" diameter tree with a witness post 0.6 meters (2.0 ft)
below the ground surface, being highest point on top of a stainless steel plug
on top of 3/8-inch diameter galvanized steel pipe, 5.8 m (19.0 ft) long, the
pipe is encased in a 1-inch diameter steel pipe and the mark is protected by a
5-inch PVC pipe, with an aluminum access cover stamped "Water" surrounded with
concrete, with witness post, 12.2 cm below the ground surface.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  8

                                                                                
Station ID: 9063028                         PUBLICATION DATE:  08/11/2017
Name:       STURGEON POINT, LAKE ERIE                         
            NY
NOAA Chart: 14822                           Latitude:   42° 41.5' N (  42.69131)
USGS Quad:  ANGOLA                          Longitude:  79°  2.8' W ( -79.04733)


                    G R E A T  L A K E S   B E N C H   M A R K S


                         BENCH MARK STAMPING:  NIEMER 1973
                         DESIGNATION:          NIEMER

MONUMENTATION:           Triangulation Station disk            VM#:        12797
AGENCY:                  National Geodetic Survey              IDB PID#:  NC0725
SETTING CLASSIFICATION:  Concrete Post                         OPUS PID:        
LATITUDE:   42° 41.2' N (  42.68706)          LONGITUDE:  79°  2.5' W ( -79.04161)


The bench mark is a disk 25.3 m (83.0 ft) NW of power pole number Nl57 N of the
road, 11.0 n (36.1 ft) S of the corner of a chain link fence N of the road, 8.2
m (26.9 ft) NE of the center of Sturgeon Point Road, and 2.7 m (8.9 ft) SW of
the same chain link fence, set in the top of a concrete post, flush with the
ground, with witness post.



                         BENCH MARK STAMPING:  3028 H 1989
                         DESIGNATION:          906 3028 H

MONUMENTATION:           Bench Mark disk                       VM#:        12798
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AB6914
SETTING CLASSIFICATION:  Stainless steel rod w/o sleeve        OPUS PID:        
LATITUDE:   42° 41.4' N (  42.68947)          LONGITUDE:  79°  2.7' W ( -79.04528)


The bench mark is a disk 274.3 m (899.9 ft) SE of gauge house, 21.7 m (71.2 ft)
N of power pole no.  70/225, 13.4 m (44.0 ft) W of 30-inch poplar tree, 6.20 m
(20.34 ft) N of centerline of dead end gravel driveway, 6.1 cm below ground
level, being a brass disc crimped to a 3.7 m (12.1 ft) stainless steel rod
driven into the ground with concrete kick block and 5-inch PVC sleeve with
aluminum access lid and witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 9063028                         PUBLICATION DATE:  08/11/2017
Name:       STURGEON POINT, LAKE ERIE                         
            NY
NOAA Chart: 14822                           Latitude:   42° 41.5' N (  42.69131)
USGS Quad:  ANGOLA                          Longitude:  79°  2.8' W ( -79.04733)


                    G R E A T  L A K E S   B E N C H   M A R K S


                         BENCH MARK STAMPING:  3028 J 1989
                         DESIGNATION:          906 3028 J

MONUMENTATION:           Bench Mark disk                       VM#:        12799
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AB6913
SETTING CLASSIFICATION:  Stainless steel rod w/o sleeve        OPUS PID:        
LATITUDE:   42° 41.3' N (  42.68772)          LONGITUDE:  79°  2.6' W ( -79.04267)


The bench mark is a disk 39.6 m (129.9 ft) N of power pole no.  Nyt217, 17.4 m
(57.1 ft) E of power pole no.  631/nyt 218, 6.2 m(20.3 ft) NE of centerline of
Sturgeon Point Road, 6.1 cm below ground level, being brass disc crimped to a
stainless steel rod driven 12.2 m (40.0 ft) to refusal, with concrete kick block
and 5-inch PVC sleeve and aluminum access lid and witness post.



                         BENCH MARK STAMPING:  3028 K 1989
                         DESIGNATION:          906 3028 K

MONUMENTATION:           Bench Mark disk                       VM#:        12800
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AB6915
SETTING CLASSIFICATION:  Concrete Bulkhead                     OPUS PID:        
LATITUDE:   42° 41.5' N (  42.69094)          LONGITUDE:  79°  2.8' W ( -79.04742)


The bench mark is a disk 38.8 m (127.3 ft) NW of most NW point of octagonal
marina store, 21.1 m (69.2 ft) ENE of top N face of stairs leading to gauge
house cell, 0.3 m (1.0 ft) NE of most S end of bulkhead, 0.3 m (1.0 ft) WNW of E
face of bulkhead, 0.4 m (1.3 ft) above ground level, being brass disc set in top
of concrete bulkhead.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 9063028                         PUBLICATION DATE:  08/11/2017
Name:       STURGEON POINT, LAKE ERIE                         
            NY
NOAA Chart: 14822                           Latitude:   42° 41.5' N (  42.69131)
USGS Quad:  ANGOLA                          Longitude:  79°  2.8' W ( -79.04733)


                    G R E A T  L A K E S   B E N C H   M A R K S


                         BENCH MARK STAMPING:  KENNEDY
                         DESIGNATION:          906 3028 KENNEDY

MONUMENTATION:           Metal Rod                             VM#:        12803
AGENCY:                  National Geodetic Survey              IDB PID#:  NC0429
SETTING CLASSIFICATION:  Copper-clad steel rod w/o sleeve      OPUS PID:        
LATITUDE:   42° 41.3' N (  42.68914)          LONGITUDE:  79°  2.8' W ( -79.04589)


The bench mark is a metal rod 23.5 m (77.1 ft) SE of utility pole, 16.5 m (54.1
ft) NW of utility pole no.  223, 16.3 m (53.5 ft) NW of W corner of most S stone
gate post, 7.3 m (24.0 ft) NE of centerline of road, 0.5 m (1.6 ft) SW of W
corner of most N stone gate post, below the ground surface, being highest point
on top of a 5/8-inch diameter copper-coated steel rod, 2.4 m (7.9 ft) long, with
5-inch PVC pipe and aluminum access cover stamped "Kennedy" set flush with the
ground and with a concrete kick block and witness post.



                         BENCH MARK STAMPING:  PERRY
                         DESIGNATION:          906 3028 PERRY

MONUMENTATION:           Metal Rod                             VM#:        12804
AGENCY:                  National Geodetic Survey              IDB PID#:  NC0432
SETTING CLASSIFICATION:  Copper-clad steel rod w/o sleeve      OPUS PID:        
LATITUDE:   42° 41.3' N (  42.68892)          LONGITUDE:  79°  2.8' W ( -79.04725)


The bench mark is a metal rod 20.5 m (67.3 ft) W of the centerline of sturgeon
point road, 16.3 m (53.5 ft) NW of a lamp pole, 1.9 m (6.2 ft) NE of NE corner
of a bay window, 0.6 m (2.0 ft) NW of N corner of a white frame dwelling and in
line with the E face of the house, 18.3 cm below the ground surface, being
highest point on top of a 5/8-inch diameter copper coated steel rod, 2.4 m (7.9
ft) long, mark is protected by a 5 inch PVC pipe, with an aluminum access cover
stamped "Perry" and concrete kick block with witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 9063028                         PUBLICATION DATE:  08/11/2017
Name:       STURGEON POINT, LAKE ERIE                         
            NY
NOAA Chart: 14822                           Latitude:   42° 41.5' N (  42.69131)
USGS Quad:  ANGOLA                          Longitude:  79°  2.8' W ( -79.04733)


                    G R E A T  L A K E S   B E N C H   M A R K S


                         BENCH MARK STAMPING:  3028 L 1997
                         DESIGNATION:          906 3028 L

MONUMENTATION:           Bench Mark disk                       VM#:        17001
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DE7802
SETTING CLASSIFICATION:  Concrete Seawall Bulkhead             OPUS PID:        
LATITUDE:   42° 41.5' N (  42.69203)          LONGITUDE:  79°  2.8' W ( -79.04708)


The bench mark is a disk on the NW side of the Sturgeon Point Marina, in top of
the center and at the N end of a section of bulkhead that projects N and S (at a
point in the bulkhead where it turns and leads to the NE) , 90.6 m (297.2 ft) N
of the S end of bulkhead, 67.8 m (222.4 ft) WSW of NE end of bulkhead, 11.6 m
(38.1 ft) WNW of a ladder at the inside corner of bulkhead, 1.3 m (4.3 ft) above
ground level, being brass disc set in top of concrete bulkhead.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 9063028                         PUBLICATION DATE:  08/11/2017
Name:       STURGEON POINT, LAKE ERIE                         
            NY
NOAA Chart: 14822                           Latitude:   42° 41.5' N (  42.69131)
USGS Quad:  ANGOLA                          Longitude:  79°  2.8' W ( -79.04733)


                    G R E A T  L A K E S   B E N C H   M A R K S


                         BENCH MARK STAMPING:  NIERMER 3 1973
                         DESIGNATION:          NIERMER 3

MONUMENTATION:           Reference Mark disk                   VM#:        18329
AGENCY:                  National Geodetic Survey              IDB PID#:  DA1857
SETTING CLASSIFICATION:  Top of concrete monument              OPUS PID:        
LATITUDE:   42° 41.3' N (  42.68803)          LONGITUDE:  79°  2.6' W ( -79.04411)


The bench mark is a disk 34.65 m (113.68 ft) SE of the centerline of Beechwood
Rd where it meets Sturgeon Point Rd, 6.39 m (20.96 ft) SW of the centerline of
Sturgeon Point Rd, 0.65 m (2.13 ft) SE of power pole number 64-219, being a
brass disc set in top of concrete monument, even with ground surface.





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: 9063028                         PUBLICATION DATE:  08/11/2017
Name:       STURGEON POINT, LAKE ERIE                         
            NY
NOAA Chart: 14822                           Latitude:   42° 41.5' N (  42.69131)
USGS Quad:  ANGOLA                          Longitude:  79°  2.8' W ( -79.04733)


                             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: 9063028                         PUBLICATION DATE:  08/11/2017
Name:       STURGEON POINT, LAKE ERIE                         
            NY
NOAA Chart: 14822                           Latitude:   42° 41.5' N (  42.69131)
USGS Quad:  ANGOLA                          Longitude:  79°  2.8' W ( -79.04733)


                             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/.