Benchmark - 420-A-3

Benchmark Number 420-A-3
Established In 1957
Condition GOOD
Latitude 45.341333
Longitude -80.033861
Reference Benchmark Yes
Vertical Datum Code UNKNOWN
Type PERMANENT_MARKER
Setting HORIZONTAL
Description A G.S.C. bronze tablet stamped 420-A-3 set in concrete supporting pier (footing) at Canadian Pacific Railway viaduct in town fourth truss support from northwest end of viaduct (First Steel truss east of James Street/Bay Street off Great North Rd). Tablet in centre of east face of northwest pier (one offour) 50 cm below top of pier. Fourth truss support from west end of viaduct, (First truss east of James Street off Great North Rd). Tablet in centre of south face of southwest pier (one of four), 50 cm below top of pier. Horizontal Position updated to NAD83CSRS in January 2010. Coordinates updated based on 2022 field notes with GPS handheld +/-3m accuracy.
Elevations
Date Elevation Status Vertical Datum Code
N/A 7.131 ACTIVE CDIGLD1985
N/A 183.133 ACTIVE IGLD1985