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Details for Benchmark: SY5671

N 47° 37.583 W 122° 08.583 (NAD 83)

Altitude: 291.84

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

Location:
In KING county, WA View Original Datasheet
Designation:
BEL 5
Marker Type:
chiseled square
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

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N 47° 37.573 W 122° 08.598

I found a chiseled square, but it is not on the top step of the concrete stairway, but rather several steps down from the very top. I searched the remainder of the steps carefully, as well as the top of the stairs, but didn't see any other squares. The one I found is quite worn, and could stand a replacement in some more durable form.

Found while searching for SuperGenious #1.

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, 3.2 KM (2.0 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 LEFT AND GO NORTH ON 148TH AVENUE NORTHEAST FOR 1.13 KM (0.70 MI) TO THE JUNCTION OF BEL-RED ROAD AND THE STATION ON THE LEFT. THE MARK IS A CHISELED SQUARE IN THE TOP OF THE CONCRETE STAIRWAY IN THE COMMISSIONERS WATERWAY PARK AT THE SOUTHWEST ANGLE OF THE INTERSECTION.
11/05/1996 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1996 RECOVERED IN GOOD CONDITION.

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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