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Details for Benchmark: RC2023

N 45° 59.452 W 121° 05.031 (NAD 83)

Altitude: 3770

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 RESET
Marker Type:
triangulation station disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

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Documented History (by the NGS)

01/01/1970 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1970 DISTANCE BETWEEN REFERENCE MARKS NOT MEASURED. LOCATED ABOUT 17 MI NE. OF GOLDENDALE. 11 MI ESE. OF GLENWOOD. ON THE HIGHEST PART OF A PROMINENT BALD MOUNTAIN ON THE SOUTHERN BOUNDARY OF THE YAKIMA INDIAN RESERVATION. NEW TO REACH FOLLOWS--TO REACH FROM GLENWOOD POST OFFICE DRIVE E. ON PAVED RD. FOR 1.1 MI TO Y-RD. INTERSECTION. TAKE LEFT FORK (TO GOLDENDALE) FOR 18.0 MI TO TOP OF GRADE AND WIRE GATE ON LEFT. GO THROUGH WIRE GATE AND FOLLOW DIRT RD. N. FOR 3.4 MI TO DOUBLE Y-RD. INTERSECTION, ONE RD. TO RIGHT AND ONE RD. TO LEFT. KEEP STRAIGHT AHEAD UP STEEPER GRADE, ON MAIN-TRAVELED RD. FOR 3.1 MI TO LOOKOUT AND STATION. A NEW STATION MARK WAS SET IN OLD DRILL HOLE. STATION MARK--STANDARD USGS ALUMINUM TABLET STAMPED GREYBACK 1946 1970 C AND GS SET IN SAME DRILL HOLE AS ORIGINAL STATION MARK WITH COLLAR OF CEMENT 4 INCH DEEP IN AN 1-1/2 FT SQUARE AROUND TABLET AND ROCK. REFERENCE MARK NO. 1--A STANDARD USC AND GS BRONZE DISK STAMPED GREYBACK NO 1 1946 CEMENTED IN A DRILL HOLE IN OUTCROPPING ROCK THAT IS FLUSH WITH THE GROUND, 20.0 FT S. OF THE SOUTHWEST CORNER OF LOOKOUT HOUSE AND ABOUT 4 FT LOWER THAN THE STATION. REFERENCE MARK NO. 2--A STANDARD USC AND GS BRONZE DISK STAMPED GREYBACK NO 2 1946 CEMENTED IN A DRILL HOLE IN OUTCROPPING ROCK THAT IS FLUSH WITH THE GROUND, 30.0 FT NE. OF THE NORTHEAST CORNER OF LOOKOUT HOUSE ON THE EDGE OF CLIFF AND ABOUT 2 FT LOWER THAN THE STATION. REFERENCE MARK NO. 3--STANDARD USGS REFERENCE MARK TABLET STAMPED GREYBACK NO 3 1946 1970 C AND GS SET IN DRILL HOLE IN ROCK OUTCROP.
01/01/1970 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1970 RECOVERED IN GOOD CONDITION.
01/01/1979 by WADNR (GOOD)
RECOVERY NOTE BY WA DEPT OF NAT RES 1979 (DS) STATION MARK GREYBACK 1946 3 INCH BRASS CAP IN GOOD CONDITION. NO 2 1946 3 INCH BRASS CAP, IN ROCK IN GOOD CONDITION. NO 1 1946 3 INCH 1P W, BRASS CAP IN GOOD CONDITION. DISTANCE AND DIRECTION FROM NEAREST TOWN--9 MI ESE FROM GLENWOOD.
10/24/1989 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1989 THE STATION IS LOCATED ABOUT 45.1 KM (28.0 MI) NORTHEAST OF WHITE SALMON, 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 ROAD TO GOLENDALE, 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 BEDROCK THAT HAS BEEN RE-ENFORCED WITH AN IRREGULAR MASS OF CONCRETE. IT IS 10.1 M (33.1 FT) WEST-SOUTHNEST OF THE LOOKOUT.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in December 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.