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Details for Benchmark: SY3706

N 47° 35.313 W 122° 08.901 (NAD 83)

Altitude: 400

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

Location:
In KING county, WA View Original Datasheet
Designation:
PHANTOM KCAS RM 4
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

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It appears the road has been widened and a walking path added. The station may be buried under that new paving.

Documented History (by the NGS)

01/01/1973 by NGS (MONUMENTED)
01/01/1983 by USPSQD (GOOD)
DESCRIBED BY US POWER SQUADRON 1983 (GCS) PHANTOM KCAS NO. 4 1973 1936 RECOVERED GOOD. RECOVERED AS DESCRIBED IN PHANTOM. STATION IS AT WESTERLY EDGE OF PARKING LOT NO. 9 ON THE NORTH SIDE OF BELLEVUE COMMUNITY COLLEGE. EXCELLENT VISIBILITY TO WEST.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (EEM) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in December 1991. No horizontal observational check was made to the station.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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