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Details for Benchmark: SY5684

N 47° 35.150 W 122° 08.533 (NAD 83)

Altitude: 431.43

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

Location:
In KING county, WA View Original Datasheet
Designation:
BEL 18
Marker Type:
survey disk
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

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Wasn't even out looking for benchmarks Sunday morning, just putting out a sign by the street for our Church that meets at Bellueve College. I looked down and there was the benchmark. This does make my first offical geocaching benchmark. My kids and have 2 other's near our home that we're going to look for later this week.

[Photos:]
photoBC benchmark
N 47° 35.133 W 122° 08.574

On NW corner of 28th and148th, drilled/glued into sidewalk by cross walk. About a 3-4" diameter disc. Logged waypoint coordinates are within the +/- 6 second horizontal accuracy estimated in the data sheet for PID SY5684.

[Photos:]
photoBEL 18 Survey Monument, Bellevue, WA
NW corner of 148th SE and 28th (gas station side of intersection) drilled/glued into sidewalk.

The station was easily found as described. The disk is unstamped, however.

[Photos:]
photoSY55684, Bellevue WA

Documented History (by the NGS)

01/01/1990 by WA0109 (MONUMENTED)
DESCRIBED BY CITY OF BELLEVUE WASHINGTON 1990 THE STATION IS LOCATED ABOUT 24.1 KM (15.0 MI) NORTH OF RENTON, 16.1 KM (10.0 MI) EAST OF SEATTLE, 6.4 KM (4.0 MI) SOUTH OF REDMOND AND ON STREET RIGHT-OF-WAY. TO REACH FROM THE INTERESECTION OF INTERSTATE HIGHAY 405 AND NORTHEAST 8TH STREET IN BELLEVUE, GO EAST ON NORTHEAST 8TH STREET FOR 3.54 KM (2.20 MI) TO THE INTERSECTION OF 148TH AVENUE NORTHEAST. TURN RIGHT AND GO SOUTH ON 148TH AVENUE NORTHEAST FOR 3.38 KM (2.10 MI) TO THE INTERSECTION OF LANDERHOLM CIRCLE AND THE STATION ON THE RIGHT. THE MARK IS SET IN A DRILL HOLE IN THE CURB AT THE NORTHWEST ANGLE OF THE INTERSECTION OF 148TH AVENUE SOUTHEAST AND LANDERHOLM CIRCLE.

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 October 1996.
  • 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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