Details for Benchmark: KM0059
N 39° 11.983 W 108° 48.833 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In MESA county, CO View Original Datasheet
- K 153
- Marker Type:
- bench mark disk
- set into the top of a round concrete monument
- May hold, but of type commonly subject to surface motion.
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Documented History (by the NGS)
|01/01/1934 by CGS (MONUMENTED)
|DESCRIBED BY COAST AND GEODETIC SURVEY 1934
IN LOMA. IN THE TOWN OF LOMA, AT THE SCHOOL BUILDING. 390 FEET WEST OF CENTERLINE OF STATE HWY. 139. 156 FEET EAST OF NORTHEAST CORNER OF LOMA SCHOOL. 36 FEET NORTH OF CENTERLINE OF DRIVEWAY TO SCHOOL. 6 FEET NORTH OF TELEPHONE POLE NO. 2. TABLET SET IN PRECAST CONCRETE POST.
|01/01/1984 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
RECOVERED IN GOOD CONDTION. A NEW DESCRIPTION FOLLOWS. 0.3 KM (0.2 MI) NORTHERLY ALONG STATE HIGHWAY 139 FROM THE POST OFFICE IN LOMA, 112.0 M (367.5 FT) WEST OF THE CENTERLINE OF THE HIGHWAY, 47.5 M (155.8 FT) EAST OF THE NORTHEAST CORNER OF THE OLD LOMA SCHOOL BUILDING, 6.7 M (22.0 FT) NORTH OF THE CENTER OF THE DRIVEWAY LEADING WEST TO THE SCHOOL BUILDING, AND 2.2 M (7.2 FT) NORTH OF UTILITY POLE NUMBER BL. THE MARK IS 0.3 METERS S FROM A WITNESS POST THE MARK IS ABOVE LEVEL WITH THE DRIVEWAY.
- 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.