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Details for Benchmark: SY5700

N 47° 36.150 W 122° 08.517 (NAD 83)

Altitude: 278.83

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

Location:
In KING county, WA View Original Datasheet
Designation:
BEL 35
Marker Type:
bolt
Setting:
footings/foundation walls of small/medium structures
Stability:
May hold, but of type commonly subject to surface motion.

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Lahontan, Pocahontas, Meeko and I tried to find this benchmark after visiting the nearby "Larsen Lake" geocache. The cover at the base of the signal post was loose, so we were able to view the bolts, but no X was found. It appears that this benchmark is gone.

Not found. The bolts on the traffic signal are now covered.

[last edit: 9/22/2003 8:05:36 PM PST]

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, 4.8 KM (3.0 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 1.61 KM (1.00 MI) TO THE INTERSECTION OF SOUTHEAST 8TH STREET AND THE STATION ON THE LEFT. THE MARK IS AN X CUT IN THE TOP OF THE SOUTHWEST BOLT OF THE BASE OF THE TRAFFIC SIGNAL IN THE NORTHEAST ANGLE OF THE INTERSECTION OF 148TH AVENUE SOUTHEAST AND SOUTHEAST 8TH STREET.
11/05/1996 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1996 MARK NOT FOUND.

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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