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Details for Benchmark: CM0357

N 32° 28.117 W 084° 59.433 (NAD 83)

Altitude: 248.49

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

Location:
In MUSCOGEE county, GA View Original Datasheet
Designation:
A 2
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Found as described, though there were too many people around to snap a photo.

Got it while in the area.

found as described.

[Photos:]
photodisk

This was an easy find from coordinates and directions. Thanks, Fort Rectus

[Photos:]
photoCM 0357 Disk
photoCM 0357 Location
photoCM 0357 The Building

Easy & fun!

Recovered in good condition as described in 1973 except that the mark is 4.5 feet above the sidewalk and the Union Station building mentioned in the “To Reach” now houses the Columbus Chamber of Commerce.
The Ralston Hotel is now the The Ralston or the Ralston Towers – an affordable living community.

GPS (HH2) coordinates were: N 32 28.122, W 84 59.415

[Photos:]
photoCM0357 - Disk - Columbus, Georgia
photoCM0357 – Eye level view.
Arrow points to the disk. Note the building date on the cornerstone.
photoCM0357 - Looking east-northeast.
The disk is in the yellow circle.
photoCM0357 - Looking northeast – wide.
The Ralston. The arrow points to the location of the mark.

Found as described and in good condition.

[Photos:]
photoA 2 - PID CM0357 - Date 1916
photo2010_04_28_IMG_2401

FOUND IT ON A ROUTINE CALL. DIDN'T HAVE MY CAMERA OR GPS.

Recovered in good condition. Marked A 2 1916. Elevation on disk is 248.602ft. not 248.49ft.

[Photos:]
photoBM A 2

Documented History (by the NGS)

01/01/1916 by CGS (MONUMENTED)
01/01/1973 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 0.4 MI W FROM COLUMBUS. ABOUT 0.35 MILE WEST ALONG 12TH STREET FROM THE UNION STATION AND THE INTERSECTION OF 12TH STREET AND 6TH AVENUE AT COLUMBUS, AT THE INTERSECTION OF 12TH STREET AND 2ND AVENUE, SET VERTICALLY IN THE WEST FACE OF THE WEST BRICK WALL OF THE RALSTON HOTEL, 2.5 FEET NORTH OF THE SOUTHWEST CORNER OF THE BUILDING, ABOUT 4 FEET ABOVE THE LEVEL OF THE SIDEWALK, AND ABOUT 4 1/2 FEET ABOVE THE LEVEL OF THE INTERSECTION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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