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Details for Benchmark: RC2702

N 45° 13.675 W 121° 56.079 (NAD 83)

Altitude: 4880

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

Location:
In CLACKAMAS county, OR View Original Datasheet
Designation:
SALMON
Marker Type:
triangulation station disk
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

Reference Points

Must Read!

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"Hmm, why can't I find the benchmark on the summit? Oh, it's tumbled down the hill!" Not at all where I expected to find it! :)

yup it is on its side - but is very visable , leaned our backpacks against this rock

As marked previously just rolled down hill a bit.
Salmon River Family

[Photos:]
photoBruce and benchmark

The earth moved. Rock has come loose and rolled down hill

[Photos:]
photoRelocation
photoSalmon Benchmark

Documented History (by the NGS)

01/01/1955 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1955 LOCATED ABOUT 10 MI SW. OF GOVERNMENT CAMP, 8 MI S. OF ZIGZAG. ON LONE TOP OF FIRST RIDGE S. OF SALMON RIVER. TO REACH FROM ESTACADA, DRIVE 0.2 MI S. ON STATE HWY. 211 TO RD. FORKS. TAKE LEFT FORK 7.6 MI TO NORTH FORK GUARD STATION AND FORKS. TAKE LEFT FORK AS PER SIGN SQUAW MTN 17 NORTHERLY AND UP GRADE TO SUMMIT, THEN EASTERLY ON MAIN-TRAVELED RD. 7.5 MI TO RD. FORKS. TAKE LEFT FORK 0.9 MI TO FORKS. TAKE RIGHT FORK AS PER SIGN SQUAW MTN LO 9, 5.7 MI TO LOOKOUT SPRINGS GUARD STATION. CONTINUE ON MAIN-TRAVELED RD. 0.5 MI TO SIDE RD. LEFT. CONTINUE STRAIGHT AHEAD ON MAIN-TRAVELED RD. 8.4 MI TO SIDE RD. LEFT. TURN LEFT AS PER SIGN SALMON BUTTE LO, NORTHERLY 2 MI TO SUMMIT OF SALMON BUTTE AND STATION. STATION MARK--STANDARD TABLET STAMPED---SALMON 1955---. RM 1--STANDARD RM TABLET STAMPED---SALMON 1955---, CEMENTED IN LARGE ROCK. RM 2--STANDARD RM TABLET STAMPED---SALMON 1955---, CEMENTED IN LARGE ROCK.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in October 1991.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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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