This Benchmark is on the west side of the highway, just south of a small pullout on the same side. We just happened to spot the witness post, or we would have missed it.
From USC&GS:
DESIGNATION - OB 40
PID - SW0067
STATE/COUNTY - WA/LINCOLN
COUNTRY - US
USGS QUAD - OLSEN CANYON (1985)
*CURRENT SURVEY CONTROL
NAD 83(1986) POSITION- 47 52 23. (N) 118 15 57. (W) SCALED
STAMPING: OB 40 1940
STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
STABILITY: SURFACE MOTION
HISTORY - Date Condition Report By
HISTORY - 1940 MONUMENTED BOR
HISTORY - 1966 GOOD CGS
STATION DESCRIPTION
DESCRIBED BY COAST AND GEODETIC SURVEY 1966
6.5 MI NW FROM NORTH STAR GRANGE HALL. ABOUT 6.5 MILES NORTHWEST ON STATE HIGHWAY 25 FROM THE NORTH STAR GRANGE, 0.25 MILE SOUTH OF HIGHWAY MILEPOST 19, ALONG A 500-YARD
STRAIGHT STRETCH OF ROAD, ACROSS THE ROAD FROM A 25-FOOT HIGH CUT BANK, BETWEEN THE ROAD AND THE CREEK, ON THE WESTERN EDGE OF A WIDE, GRASSY AREA, 78.5 FEET NORTHWEST OF THE WEST END OF AN 18-INCH CULVERT, 49.5 FEET WEST OF THE CENTER OF THE HIGHWAY, AND 2 FEET EAST OF THE TOP OF THE CREEK BANK. THE MARK IS SET IN A SQUARE CONCRETE POST WHICH PROJECTS ABOUT 2 INCHES, AND IS APPROXIMATELY LEVEL WITH THE ROAD.