The Beginning of the Third Principal Meridian - Cairo, IL
Posted by: 
YoSam.
N 36° 59.558 W 089° 09.480
16S E 307958 N 4096231
Along side US 51, just north of the Ohio River bridge and Fort Defiance, is this survey marker. There is also, a similar marker at the entrance to the fort just south of here.
Waymark Code: WM16X5X
Location: Illinois, United States
Date Posted: 10/22/2022
Views: 0
County of marker: Alexander County
Location of marker: US 51, N. of Fort Defiance
Marker text:
The beginning of the Third Principal Meridian is located in the Ohio River 1,810 feet directly North of this point.
In November, 1803, this was the mouth of the Ohio River. At this location, the Lewis and Clark Corps of Discovery encamped for six days.
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