U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  9

                                                                                
Station ID: 9063020                         PUBLICATION DATE:  08/11/2017
Name:       BUFFALO, LAKE ERIE                                
            NY
NOAA Chart:                                 Latitude:   42° 52.6' N (  42.87744)
USGS Quad:                                  Longitude:  78° 53.4' W ( -78.89047)


TO REACH THE NOS GAUGING STATION AT BUFFALO, ERIE COUNTY, NEW YORK, FROM THE
INTERSECTION OF SR-5 AND FUHRMAN BLVD, PROCEED NORTH ON FUHRMAN BLVD FOR 2.3 KM
(1.40 MI) TO USCG STATION. GAUGING STATION IS ON SOUTH SIDE OF THE BUFFALO
RIVER, NEAR UPRIVER END OF THE COAST GUARD BASE.


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


                 PRIMARY BENCH MARK STAMPING:  MACHINE
                         DESIGNATION:          906 3020 MACHINE

MONUMENTATION:           Flange-encased Rod                    VM#:        12785
AGENCY:                  National Geodetic Survey              IDB PID#:  NC0403
SETTING CLASSIFICATION:  Galvanized steel pipe in sleeve       OPUS PID:        
LATITUDE:   42° 52.7' N (  42.87753)          LONGITUDE:  78° 53.3' W ( -78.88797)


The bench mark is a galvanized steel pipe in sleeve 29.6 meters (97.1 ft) SSE of
NE corner of machine shop, 14.1 meters (46.3 ft) NW of utility pole, 13.4 meters
(44.0 ft) E of SE corner and in line with S face of machine shop, 5.0 meters
(16.4 ft) N of face of curb, 0.5 meters (1.6 ft) below the ground surface, being
highest point on top of a stainless steel plug on top of a 3/8-inch diameter
galvanized steel pipe, 4.6 meters (15.1 ft) long.  The pipe is encased in a
1-inch diameter steel pipe and the mark is protected by a 6-inch diameter
concrete pipe, with PVC pipe extension and aluminum access cover and concrete
kick block, flush with the ground surface with witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  9

                                                                                
Station ID: 9063020                         PUBLICATION DATE:  08/11/2017
Name:       BUFFALO, LAKE ERIE                                
            NY
NOAA Chart:                                 Latitude:   42° 52.6' N (  42.87744)
USGS Quad:                                  Longitude:  78° 53.4' W ( -78.89047)


                    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 3020 BUFFALO LH

MONUMENTATION:           See descriptive text                  VM#:        12786
AGENCY:                                                        IDB PID#:  NC0435
SETTING CLASSIFICATION:  WATER TABLE                           OPUS PID:        
LATITUDE:   42° 52.7' N (  42.87783)          LONGITUDE:  78° 53.4' W ( -78.88944)


The bench mark is on the Old Buffalo Harbor light house, at angle formed by NE
and E sides of the octagonal stone water table, 1.20 meters (3.94 ft) S of the
centerline of light house door, 0.6 meters (2.0 ft) SE of SE door jamb, 0.81
meters (2.66 ft) above rubble mound on which the light rests, being highest
point of knob cut on top of the stone water table.



                         BENCH MARK STAMPING:  BASE
                         DESIGNATION:          906 3020 BASE

MONUMENTATION:           Metal Rod                             VM#:        12787
AGENCY:                  National Geodetic Survey              IDB PID#:  NC0406
SETTING CLASSIFICATION:  Copper-clad steel rod w/o sleeve      OPUS PID:        
LATITUDE:   42° 52.6' N (  42.87672)          LONGITUDE:  78° 53.1' W ( -78.88444)


The bench mark is a copper-clad steel rod 29.5m (96.8 ft) W of utility pole
NM3R, 17.4m (57.1 ft) SE of W galvanized pole for chain link gate entrance,
14.8m (48.6 ft) SE of the E galvanized pole of the gate entrance.  8.7m (28.5
ft) SE of E brick gate post, 5.2m (17.1 ft) SW of the W leg of the Lighthouse
Point Park plaque, 4.4m (14.4 ft) E of the centerline of the road leading to the
Coast Guard base. 0.3m (1.0 ft) below the ground surface, being highest point on
top of a 5/8-inch diameter copper-coated steel rod, 10.1m (33.1 ft) long.  With
aluminum access cover stamped "base" and concrete kick block set flush with the
ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  9

                                                                                
Station ID: 9063020                         PUBLICATION DATE:  08/11/2017
Name:       BUFFALO, LAKE ERIE                                
            NY
NOAA Chart:                                 Latitude:   42° 52.6' N (  42.87744)
USGS Quad:                                  Longitude:  78° 53.4' W ( -78.89047)


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


                         BENCH MARK STAMPING:  25  1935
                         DESIGNATION:          906 3020 25

MONUMENTATION:           Survey disk                           VM#:        12788
AGENCY:                  US Engineers                          IDB PID#:  NC0404
SETTING CLASSIFICATION:  ROCK WALL                             OPUS PID:        
LATITUDE:   42° 52.7' N (  42.87767)          LONGITUDE:  78° 53.2' W ( -78.88606)


The bench mark is a survey disk 50.2m (164.7 ft) NE of the NE corner of a 0.9m
(3.0 ft) x 1.2m (3.9 ft) concrete block in field beside a basketball court, 8.8m
(28.9 ft) from river face of dockline, on top of a rock wall, 3.7m (12.1 ft)
downriver from face of top step of a flight of stone steps, 0.6m (2.0 ft) toward
river from the wall centerline, being highest point on top of bronze disc set
into top of the wall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  9

                                                                                
Station ID: 9063020                         PUBLICATION DATE:  08/11/2017
Name:       BUFFALO, LAKE ERIE                                
            NY
NOAA Chart:                                 Latitude:   42° 52.6' N (  42.87744)
USGS Quad:                                  Longitude:  78° 53.4' W ( -78.89047)


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


                         BENCH MARK STAMPING:  A-25 1921
                         DESIGNATION:          A 25

MONUMENTATION:           Bench Mark disk                       VM#:        12789
AGENCY:                  US Coast and Geodetic Survey          IDB PID#:  NC0436
SETTING CLASSIFICATION:  WATER LEVEL                           OPUS PID:        
LATITUDE:   42° 52.7' N (  42.87789)          LONGITUDE:  78° 53.4' W ( -78.88936)


The bench mark is a disk on E side of octagonal stone water table, 1.2m (3.9 ft)
from angle formed by E and NE sides, 0.60m (1.97 ft) N of the SE corner of light
house, 0.60m (1.97 ft) S of NE corner of light house, 0.64m (2.10 ft) above
ground being horizontal line on bronze disc set into the water table marked A-25
1921.



                         BENCH MARK STAMPING:   
                         DESIGNATION:          658 USE

MONUMENTATION:           Survey disk                           VM#:        12791
AGENCY:                                                        IDB PID#:  NC0405
SETTING CLASSIFICATION:  WALL                                  OPUS PID:        
LATITUDE:   42° 52.7' N (  42.87831)          LONGITUDE:  78° 53.0' W ( -78.88331)


To reach the BM 906 3020 Use, in Buffalo, Erie County, New York, from the
intersection of SR-5 and Fuhrman Blvd, proceed north on Fuhrman Blvd for 2.3 km
(1.40 mi) to Buffalo Coast Guard station, the BM is located on the USCG
property, on the south side of Buffalo River near its mouth, about 304.8 meters
(1000.0 ft) upriver from coast guard lookout tower, 8.80 meters (28.87 ft) west
of the end of the stone retaining wall, 0.80 meters (2.62 ft) from the river
face of the wall, being highest point on top of bronze disc set into top of the
wall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  9

                                                                                
Station ID: 9063020                         PUBLICATION DATE:  08/11/2017
Name:       BUFFALO, LAKE ERIE                                
            NY
NOAA Chart:                                 Latitude:   42° 52.6' N (  42.87744)
USGS Quad:                                  Longitude:  78° 53.4' W ( -78.89047)


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


                         BENCH MARK STAMPING:  Q 410 1977
                         DESIGNATION:          Q 410

MONUMENTATION:           Bench Mark disk                       VM#:        12792
AGENCY:                  National Geodetic Survey              IDB PID#:  NC0701
SETTING CLASSIFICATION:  PILLAR                                OPUS PID:        
LATITUDE:   42° 52.0' N (  42.86733)          LONGITUDE:  78° 52.6' W ( -78.87706)


The bench mark is a disk 10.4m (34.1 ft) N of the center of the median island
under Highway 5, 8.92m (29.27 ft) W of the most SE concrete support pillars,
0.6m (2.0 ft) E of the most SW concrete support pillar of the overpass, 1.2m
(3.9 ft) above ground, in the top of a 9.10m (29.86 ft) long concrete cross tie
of 2 pillars.



                         BENCH MARK STAMPING:  3020 G 1995
                         DESIGNATION:          906 3020 G

MONUMENTATION:           Bench Mark disk                       VM#:        12793
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Vertically in Gauge House Wall        OPUS PID:        
LATITUDE:   42° 52.6' N (  42.87744)          LONGITUDE:  78° 53.4' W ( -78.89047)


The bench mark is a disk set vertically in the E face and at the SE corner of
the NOS gauge house, 2.44m (8.01 ft) SE of the SW corner of gauge house, 2.20m
(7.22 ft) S of the NE corner of the gauge house, 0.3 m (1.0 ft) N of the SE
corner of the gauge house, and 1.50m (4.92 ft) above the ground, being
horizontal line of bronze bench mark disk.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  9

                                                                                
Station ID: 9063020                         PUBLICATION DATE:  08/11/2017
Name:       BUFFALO, LAKE ERIE                                
            NY
NOAA Chart:                                 Latitude:   42° 52.6' N (  42.87744)
USGS Quad:                                  Longitude:  78° 53.4' W ( -78.89047)


                    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 3020 SILO

MONUMENTATION:           Metal Rod                             VM#:        17002
AGENCY:                  National Geodetic Survey              IDB PID#:  NC0700
SETTING CLASSIFICATION:  Copper-clad steel rod w/o sleeve      OPUS PID:        
LATITUDE:   42° 52.4' N (  42.87328)          LONGITUDE:  78° 52.9' W ( -78.88142)


The bench mark is a copper-clad steel rod on the E side of Fuhrman Blvd, 23.7m
(77.8 ft) NW of a fire hydrant, 14.8m (48.6 ft) SE of a power pole numbered 144,
11.2m (36.7 ft) NW of a black metal light pole numbered 152, 5.2m (17.1 ft) NE
of the centerline of Fuhrmann Boulevard, 2.7m (8.9 ft) SW of a chain link fence,
being the highest point on top of a 5/8-inch copper coated steel rod driven to a
depth of 8.53m (28.0 ft) with 5-inch pvc pipe and aluminum access cover stamped
'SILO 1976' surrounded by a concrete kick block flush with the ground.



                         BENCH MARK STAMPING:  3020 H 1997
                         DESIGNATION:          906 3020 H

MONUMENTATION:           Metal Rod                             VM#:        17003
AGENCY:                  National Geodetic Survey              IDB PID#:  AH9234
SETTING CLASSIFICATION:  Stainless steel rod w/o sleeve        OPUS PID:        
LATITUDE:   42° 52.6' N (  42.87703)          LONGITUDE:  78° 53.4' W ( -78.88983)


The bench mark is a stainless steel rod 72.9m (239.2 ft) SSE of the SE corner of
the NOAA/NOS water level gauging station, 30.5m (100.1 ft) N of the S side of
boat basin wall, 11.2m (36.7 ft) E of the center of the circular drive by gauge
house, 0.8 ft (24.4 cm) W of a witness post, 0.2 ft (6.1 cm) below ground
surface, being highest point on top of a stainless steel rod, 5.5m (18.0 ft)
long. The rod is protected by a 5 inch diameter PVC sleeve 1.2m (3.9 ft) long,
the BM is encased in concrete with an aluminum access cover, set flush with the
ground surface with witness post.





                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  9

                                                                                
Station ID: 9063020                         PUBLICATION DATE:  08/11/2017
Name:       BUFFALO, LAKE ERIE                                
            NY
NOAA Chart:                                 Latitude:   42° 52.6' N (  42.87744)
USGS Quad:                                  Longitude:  78° 53.4' W ( -78.89047)


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  8 of  9

                                                                                
Station ID: 9063020                         PUBLICATION DATE:  08/11/2017
Name:       BUFFALO, LAKE ERIE                                
            NY
NOAA Chart:                                 Latitude:   42° 52.6' N (  42.87744)
USGS Quad:                                  Longitude:  78° 53.4' W ( -78.89047)


                             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  9 of  9

                                                                                
Station ID: 9063020                         PUBLICATION DATE:  08/11/2017
Name:       BUFFALO, LAKE ERIE                                
            NY
NOAA Chart:                                 Latitude:   42° 52.6' N (  42.87744)
USGS Quad:                                  Longitude:  78° 53.4' W ( -78.89047)


                             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/.