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Details for Benchmark: CM1924

N 32° 28.105 W 084° 59.049 (NAD 83)

Altitude: 254

Coordinates may not be exact. Altitude is VERTCON and location is ADJUSTED. (more info)

Location:
In MUSCOGEE county, GA View Original Datasheet
Designation:
COLUMBUS F
Marker Type:
triangulation station disk
Setting:
set into the top of a round concrete monument
Stability:

Reference Points

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Did not find the Station Mark or RM1.

With the train shed and RM2 gone there is not much left to measure from to search for the station mark disk.
Starting with the assumption that the northeast corner of the foundry building is very close to where RM2 used to be and then measuring 34.3 feet at the inverse of 269 degrees would put the mark’s location under gravel or asphalt or destroyed when the tracks were moved. Possibly it is just buried.

The train shed mentioned in the 1917 description is now gone. See the attached 1918 postcard photo that shows where the train shed (with the arched roof) used to be. One would suspect that RM1, which was set in the SW column of the train shed, is also gone. I did have a brief look at the SE corner of the station/depot which might have been close to the SW corner of the shed. However, I did not find any evidence of RM1.

Suggestions for anyone making a future search:
- A metal detector might help to search under the gravel.
- Search after 6:00PM or during a weekend. During the workday there were more cars than parking spaces and cars were parked all around the corner of the building. After 6:00 PM all the cars were gone.

[Attribution note: The 1918 postcard photo (3rd photo below) came from the online archives for the Chattahoochee Valley Libraries.]

[Photos:]
photoSuspected location of CM1924.
Looking south-southeast. If the Station mark still exists we suspect it would be under the gravel/ asphalt in the area within the yellow oval.
photoSuspected location of RM1.
Looking at old photos and taking measurements, we suspect that RM1’s location is somewhere in the area indicated by the arrows (behind the dumpster). See next photo for a better view.
photoSuspected location for RM1 – better view.
Here is the area behind the dumpster where we suspect RM1 would be (in the yellow oval).
photo1918 photo of train station and shed - looking ENE
The train shed has an arched roof. The main train station building itself still exists today – with a 2nd story portion added on the south end - see current photo.
photoCurrent view of train station building.
We compared old (1918) and current photos of the area to identify the approximate location for the SW train shed column where RM1 was.
photoCorner of building where RM2 used to be.
Northeast corner of Golden’s foundry building.

Documented History (by the NGS)

01/01/1917 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1917 (CLG) ON THE SOUTH SIDE OF 12TH STREET, OPPOSITE THE UNION STATION IN COLUMBUS, ON THE WEST SIDE OF THE MAIN TRACK OF CENTRAL OF GEORGIA RAILWAY, MIDWAY BETWEEN THE TWO WESTERNMOST TRACKS THAT ENTER THE TRAIN SHED. SURFACE AND UNDERGROUND MARKS ARE SET. REFERENCE MARK NO. 1 IS A TRIANGULATION TABLET AT FOOT OF SOUTHWEST COLUMN OF TRAIN SHED AND IS 100.5 FEET FROM STATION. REFERENCE MARK NO. 2 IS A RAILROAD IRON AT NORTHEAST CORNER OF GOLDENS FOUNDRY AND MACHINE CO. BUILDING, AND IS 34.3 FEET FROM STATION.
01/01/1947 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1947 (CMD) RECOVERED IN GOOD CONDITION. IN DESCRIPTION DELETE MIDWAY AS TRACKS HAVE BEEN MOVED AND STATION IS NEARER WEST TRACK, NOW 5.7 FEET EAST OF EAST RAIL OF WESTMOST TRACK THAT ENTERS THE TRAIN SHED. REFERENCE MARK NO. 2 HAS BEEN REMOVED

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in September 1997.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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