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Details for Benchmark: NV0940

N 42° 22.933 W 115° 53.083 (NAD 83)

Altitude: 5116.28

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

Location:
In OWYHEE county, ID View Original Datasheet
Designation:
65 EMH
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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N 42° 22.906 W 115° 53.113

We went on a benchmarking week-end over the 4th of July and had a blast... new co-ords provided...

Documented History (by the NGS)

01/01/1972 by USGS (MONUMENTED)
06/17/1964 by USGS (GOOD)
DESCRIBED BY US GEOLOGICAL SURVEY 1964 FROM GRASMERE, IDAHO, PROCEED 0.4 MILES SOUTH ALONG HIGHWAY 51, ON THE NORTH BANK OF A LARGE DRAIN, 180 FEET SOUTH OF THE CENTERLINE OF A DIRT ROAD WEST, 117 FEET WEST AND ABOUT LEVEL WITH THE CENTERLINE OF STATE HIGHWAY 51, SET IN A ROCK OUTCROP PROJECTING 0.2 FEET.
06/01/1984 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 (BWM) LOCATION--61.4 KM (38.4 MI) SOUTH OF BRUNEAU. 61.4 KM (38.4 MI) SOUTH ALONG STATE HIGHWAY 51 FROM THE JUNCTION OF HOT SPRINGS ROAD AT BRUNEAU, 0.5 KM (0.3 MI) NORTH OF THE CAFE AND GAS STATION AT GRASMERE, IN TOP OF A 2- BY 4-FOOT PORTION OF OUTCROP ON THE NORTH EDGE OF A WASH, AT THE T JUNCTION OF A ROAD LEADING WEST, 0.2 KM (0.1 MI) SOUTH OF MILEPOST 33, 29.6 M (97.5 FT) WEST OF THE HIGHWAY CENTERLINE, 60.9 M (200 FT) NORTH OF THE WEST END OF A 18-INCH CORRUGATED METAL PIPE CULVERT, 51.2 M (168 FT) SOUTH OF THE CENTER OF THE ROAD LEADING WEST, 28.4 M (93.5 FT) EAST OF A FENCE AND 25.9 M (85 FT) WEST OF THE NORTH END OF A STEEL GUARDRAIL. 2.0 M BELOW THE HIGHWAY. 0.5 M EAST FROM A WITNESS POST.

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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