Benchmark - ABC-1

Benchmark Number ABC-1
Established In 1973
Condition GOOD
Latitude 42.317556
Longitude -82.453306
Reference Benchmark Yes
Vertical Datum Code UNKNOWN
Type BRONZE_TABLET
Setting VERTICAL
Description A Canadian Hydrographic Service bronze tablet stamped ABC-1 1973, set vertically in the horizontal face of the concrete base of the old lighthouse, 0.66 metres southerly of the door. The lighthouse is located just south of the government wharf at the mouth of the Thames River in the southeast end of Lake St. Clair. Source: Fieldsheet 3804 BM Coordinates based on handheld GPS +/- 3m, updated December 2019. Previous coordinates 42.31755, -82.45327. NOTE: cement covering edges as of 2018-04-06
Elevations
Date Elevation Status Vertical Datum Code
1992-01-01 1.871 ACTIVE CDIGLD1985