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Details for Benchmark: JY1230

N 39° 19.898 W 082° 59.104 (NAD 83)

Altitude: 629.51

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

Location:
In ROSS county, OH View Original Datasheet
Designation:
E 338
Marker Type:
metal rod
Setting:
stainless steel rod in sleve
Stability:
Most reliable and expected to hold position/elevation well.

Must Read!

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There seem to be many newer benchmarks that I have found on this trip. The postoffice building is newish as is this metal rod. Easy to spot near the flag pole in the front lawn. It is just down the street from the courthouse, which has two other benchmarks.

Discovered

[Photos:]
photo

This is the first Stainless steel rod in a sleeve that I found. Really nice.

found it as lil_ellie introduced me to benchmarking. Pretty cool.

[Photos:]
phototop of the cover
photowith the cover open

Found with terra di madre. Didn't have a tool to open it. Also took pic of benchmark showing it's relationship and placement to the base of the flagpole. My smartphone is my GPS and camera.

[Photos:]
photoJY1230_1
photoJY1230_2

found today while shipping a package out did not have camera

This was my first excursion. This is an interesting way to use and enjoy a GPS...

Wow! Didn't know they did these like this. Logging this one for the benchmark game.

[Photos:]
photobenchmark metal rod jy1230
Logging the benchmark contest photo for "metal rod"

Found it while on the "Three Hour Tour" trip.

Found easily.

This was my first trip out to find a benchmark. This was a easy one to locate.

Found with no difficulty.

Documented History (by the NGS)

01/01/1984 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1984 IN CHILLICOTHE. IN CHILLICOTHE, AT THE INTERSECTION OF WALNUT STREET AND WEST 4TH STREET, AT THE U.S. POST OFFICE, AT THE EAST SIDE OF A FLAG POLE, 12.22 METERS (40.1 FT) WEST OF THE CENTERLINE OF WALNUT STREET, 7.92 METERS (26.0 FT) SOUTH OF THE CENTER OF THE ENTRANCE TO THE POST OFFICE, 1.58 METERS (5.2 FT) EAST OF THE FLAG POLE. THE MARK IS 0.18 M ABOVE WALNUT STREET.
08/08/1995 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1995 (AJL) LOCATED AT CHILLICOTHE AT THE US POST OFFICE AT THE JUNCTION OF WALNUT STREET AND WEST 4TH STREET, SET IN THE FRONT LAWN JUST EAST OF THE FLAGPOLE. TO REACH FROM THE JUNCTION OF US HIGHWAY 35 AND STATE ROUTE 159 AT THE NORTH SIDE OF CHILLICOTHE, GO SOUTH 1.8 KM (1.10 MI) ON BRIDGE STREET, TURN RIGHT AND GO 1.0 KM (0.60 MI) WEST ON WEST 4TH STREET TO WALNUT STREET AND THE POST OFFICE ON THE RIGHT. THE STATION IS 32.0 M (105.0 FT) NORTH OF THE CENTERLINE OF WEST 4TH STREET, 12.2 M (40.0 FT) WEST OF THE CENTERLINE OF WALNUT STREET, 7.9 M (25.9 FT) SOUTH OF THE CENTER OF THE POST OFFICE ENTRANCE DOOR, 5.1 M (16.7 FT) EAST OF THE EAST FACE OF THE POST OFFICE BUILDING, AND 1.6 M (5.2 FT) EAST OF THE FLAGPOLE.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in August 1996.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • 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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