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Details for Benchmark: RD4385

N 45° 59.544 W 122° 07.841 (NAD 83)

Altitude: 4172

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

Location:
In SKAMANIA county, WA View Original Datasheet
Designation:
SIOUXON PK LO RM
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Most reliable and expected to hold position/elevation well.

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Considerable damage to the triangulation benchmark. The reference mark nearby is in fine shape.

This entry was edited by MAPANZIGAN on Thursday, 18 September 2014 at 21:09:15 UTC.

N 45° 59.330 W 122° 07.500

Disc is beat to heck, there is a "RM NO. 2" disc set in 1985 with an arrow pointing toward the beat up one. It is in great shape. I got an elevation of 4168.

[Photos:]
photoThe original
photoRM NO. 2

Documented History (by the NGS)

Unknown by (MONUMENTED)
1/1/1953 by USGS (GOOD)
DESCRIBED BY US GEOLOGICAL SURVEY 1953 LOCATED ABOUT 6.7 MI SE. OF LEWIS RIVER RANGER STATION, 4.5 MI S. OF LEWIS RIVER. ON HIGHEST POINT OF SIOUXON PEAK. TO REACH FROM HEMLOCK RANGER STATION IN WIND RIVER DISTRICT, FOLLOW WELL-MARKED USFS RDS. NORTHERLY TO END OF RD. AT SIOUXON PEAK. PACK W. AND S. ALONG USFS TRAIL ABOUT FIVE MINUTES TO USFS LOH ON TOP AND STATION. STATION MARK--USFS DISK STAMPED---SIOUXON LO---, CEMENTED IN ROCK AT NORTHEAST CORNER OF LOH.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in April 1994.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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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