NGS Calibration Baseline starting point– Disk 0 M - U.S. Benchmarks on Waymarking.com

At this location extending southerly lies the Calibration Baseline for the purpose of calibrating survey instruments. It was dedicated by the Illinois DOT in 1988 in honor of one of its employees.
According to the information on the sign, the farthest mark is 1100 meters away. However, the distance that is stamped on each of the individual disks does not correspond with the proper distance. The 1100 M disk is found only 500 meters from the 0 M disk.
From the web site
THE 0-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "0 M 1988" SET IN THE TOP OF A 45 CM (18 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND. IT IS 17.8 M (58.4 FT) SOUTH OF THE CENTERLINE OF THE PAVED ROAD, 4.4 M (14.4 FT) WEST OF THE CENTERLINE OF OLD HIGHWAY 51, 3.3 M (10.8 FT) SOUTHEAST OF A "PAINT TEST STRIP" SIGN, AND 1.0 M (3.3 FT) EAST OF A WITNESS POST.

Condition: Mark found in good condition Designation: 0 M Benchmark Agency: National Geodetic Survey Monumentation type: other (not any of the below) Monumentation type (if other): Calibration Baseline County: Jackson USGS 7.5' Topographic Quadrangle Name (optional): De Soto Find type: Found by luck/skill/knowledge Web address of this benchmark's datasheet (optional): [Web Link] Benchmark Agency (if other): Not listed Special category (optional): Not listed Special Category (if other): Not listed NGS PID: Not listed Local database's URL (optional): Not listed

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