Joliet Central High School benchmarks - Joliet, IL
Posted by: adgorn
N 41° 31.502 W 088° 04.499
16T E 410312 N 4597601
Two benchmarks on either side of doorway entrance to school measuring elevation with regard to local and coastal sea level.
Waymark Code: WM9AA5
Location: Illinois, United States
Date Posted: 07/21/2010
Views: 5
On the left, a square benchmark marks both height above New York Harbor sea level as 545.674 feet and height below Lake Michigan Chicago Datum as 34.156 feet.
On the right, a circular benchmark from the US Geological Survey dated 1920 marking 546 feet above sea level. (Also indicating a $250 fine if you chisel it out of the wall!)
Found by pure luck while locating bust of Joliett high overhead for another waymark.