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Details for Benchmark: SV0731

N 47° 58.550 W 117° 24.467 (NAD 83)

Altitude: 2208.18

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

Location:
In SPOKANE county, WA View Original Datasheet
Designation:
WP C RM 3
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Documented History (by the NGS)

01/01/1959 by DOD (MONUMENTED)
01/01/1960 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1960 3.5 MI NE FROM DEER PARK. AT SITE 567-1 DEER PARK C-1, FRONTING THE ENTRANCE TO THE COFFIN, 7 FEET SOUTHEAST FROM A POWER POLE, GUARDED BY TWO POSTS 6 INCHES SQUARE, SET IN A SQUARE PRECAST CONCRETE POST PROJECTING 5 INCHES ABOVE THE GROUND. NOTE-- THIS MONUMENT SHOULD BE WATCHED FOR CHANGE OF ELEVATION THROUGH FROST ACTION.

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.