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Details for Benchmark: RC2737

N 45° 59.446 W 121° 05.038 (NAD 83)

Altitude: 3769

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

Location:
In KLICKITAT county, WA View Original Datasheet
Designation:
GREY BACK RM 1
Marker Type:
reference mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Documented History (by the NGS)

01/01/1946 by CGS (MONUMENTED)
10/24/1989 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1989 THE STATION IS LOCATED ABOUT 45.1 KM (28.0 MI) NORTHEAST OF WHITE SALOM, 38.6 KM (24.0 MI) EAST OF TROUT LAKE, 27.4 KM (17.0 MI) NORTHWEST OF GOLDENDALE AND AT THE TOP OF A HIGH BARE TOPPED PEAK ON THE SOUTHERN BORDER OF THE YAKIMA INDIAN RESERVATION. PERMISSION TO VISIT THE STATION SHOULD BE OBTAINED AT THE YAKIMA AGENCY AT TOPPENISH. TO REACH FROM THE POST OFFICE IN GLENWOOD, GO EAST ON THE SURFACED ROAD FOR 1.45 KM (0.90 MI) TO A FORK. TAKE THE LEFT FORK, THE MAIN ROAD TO GOLDENDALE, AND GO EASTERLY FOR 19.96 KM (12.40 MI) TO A BRIDGE. CONTINUE AHEAD ON THE GOLDENDALE ROAD FOR 9.01 KM (5.60 MI) TO THE TOP OF THE GRADE AND A SIDE ROAD LEFT. TURN LEFT ON THE BLADED ROAD FOR 5.47 KM (3.40 MI) TO A THREE-WAY INTERSECTION. CONTINUE AHEAD ON THE MAIN ROAD UPHILL FOR 4.99 KM (3.10 MI) TO THE TOP OF THE MOUNTAIN, THE LOOKOUT AND THE STATION. THE MARK IS SET IN A DRILL HOLE IN OUTCROPPING BEDROCK. IT IS 6.1 M (20.0 FT) SOUTH OF THE SOUTHWEST CORNER OF THE LOOKOUT HOUSE AND ABOUT 1.2 M (3.9 FT) LOWER THAN THE STATION.
11/08/1990 by (GOOD)
RECOVERED 1990 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in May 1991.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.