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Details for Benchmark: SX1456

N 47° 39.634 W 121° 46.986 (NAD 83)

Altitude: 1693

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

Location:
In KING county, WA View Original Datasheet
Designation:
CANYON
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Documented History (by the NGS)

01/01/1937 by WAGS (MONUMENTED)
DESCRIBED BY WASHINGTON GEODETIC SURVEY 1937 STATION IS ON A RIDGE LYING W OF CANYON CREEK, IN T.25, R.8E. IT IS A LOGGED RIDGE BARE EXCEPT AT THE N END. THE STATION IS ON A HIGH KNOLL NEAR THE MIDDLE OF THIS RIDGE. THE STATION CAN BE REACHED BY LOGGING RAILROAD TO CAMP A FROM SNOQUALMIE WITH PERMISSION FROM THE SNOQUALMIE LUMBER COMPANY. FROM THE CAMP WALK W TO OLD LOGGING GRADE WHICH RUNS ALONG THE FOOT OF THE FIRST RIDGE 200 TO 300 YARDS. FOLLOW GRADE S AND SWING AROUND S END OF RIDGE ABOVE CANYON CREEK. CROSS THE CREEK AND STATION IS ON THE HIGHEST HILL ON W SIDE OF THE CREEK.
01/01/1952 by USGS (MONUMENTED)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1952 STATION AND REFERENCE MARK WERE RECOVERED IN GOOD CONDITION. STATION CAN BE REACHED BY DRIVING TO SNOQUALMIE LOOKOUT STATION. IT IS ON A BOULDER ALMOST UNDER THE LOOKOUT TOWER. THE REFERENCE MARK IS ON A BOULDER UNDER THE LOOKOUT TOWER.
01/01/1973 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1973 (JLC) THE STATION MARK AND REFERENCE MARK WERE SEARCHED FOR BUT NOT RECOVERED. HOWEVER, THE DRILL HOLES WERE BELIEVED TO HAVE BEEN FOUND AND CANYON 2 WAS ESTABLISHED AND OCCUPIED AT THIS TIME. FOR THE TO REACH, SEE THE DESCRIPTION THEREOF. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 6-1/4 MILES EAST-NORTHEAST OF CARNATION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in December 1991.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.