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Details for Benchmark: JJ0275

N 38° 46.933 W 102° 54.550 (NAD 83)

Altitude: 4391

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

Location:
In CHEYENNE county, CO View Original Datasheet
Designation:
Z 255
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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N 38° 46.946 W 102° 54.576

Bench Mark Z 255 was recovered in good condition. It was as described, except that the semaphore is no longer there.

[Photos:]
photoJJ0275 20060721 G (Cheyenne Co. CO)
Bench Mark Z 255 w/GPSr.
photoJJ0275 20060721 C (Cheyenne Co. CO)
Bench Mark Z 255.
photoJJ0275 20060721 B (Cheyenne Co. CO)
Bench Mark Z 255 from Eye Level.
photoJJ0275 20060721 A1 SE (Cheyenne Co. CO)
Southeast at Bench Mark Z 255.
photoJJ0275 20060721 A2 E (Cheyenne Co. CO)
East at Bench Mark Z 255.
photoJJ0275 20060721 A3 S (Cheyenne Co. CO)
South at Bench Mark Z 255.

Documented History (by the NGS)

01/01/1938 by CGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1938 6.8 MI NW FROM KIT CARSON. 6.8 MILES NORTHWEST ALONG THE UNION PACIFIC RAILROAD FROM THE STATION AT KIT CARSON, CHEYENNE COUNTY, 6.0 MILES SOUTHEAST OF WILD HORSE, 0.2 MILE WEST OF STATION AT SORRENTO, 65 YARDS EAST OF SEMAPHORE 4943, AND IN THE TOP OF A TWIN CONCRETE-PIPE CULVERT. A STANDARD DISK, STAMPED Z 255 1938.
01/01/1938 by NGS (GOOD)

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.
  • 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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