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Details for Benchmark: TQ0435

N 48° 31.861 W 120° 01.634 (NAD 83)

Altitude: 6651

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

Location:
In OKANOGAN county, WA View Original Datasheet
Designation:
PEARRYGIN
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Found benchmark and reference mark 2 as listed. Did not see reference mark 1 near old lookout location. Lookout has been destroyed as noted. There are still remains of lookout visible. We also found the old log outhouse which is still standing.

Marvin Gardens and the Hooligals

[Photos:]
photoPearrygin Benchmark
photoPearrygin Reference Mark 1
photoPearrygin Peak Outhouse

Documented History (by the NGS)

01/01/1950 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1950 (WRH) STATION IS LOCATED ON THE HIGHEST POINT OF PEARRYGIN PEAK, AIRLINE, ABOUT 12 MILES NORTH NORTHEAST OF TWISP, 7 MILES NORTHEAST OF WINTHROP AND 10 FEET NORTH OF THE U.S. FOREST SERVICE LOOKOUT TOWER. STATION MARK, STAMPED PEARRYGIN 1950, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN OUTCROPPING BEDROCK THAT PROJECTS 5 FEET ABOVE THE GROUND. REFERENCE MARK NUMBER 1, STAMPED PEARRYGIN NO 1 1950, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN OUTCROPPING BEDROCK THAT PROJECTS 15 INCHES ABOVE THE GROUND AND IS 15 FEET LOWER IN ELEVATION THAN THE STATION. IT IS IN THE SAME OUTCROP AND RIGHT NEXT TO THE ANCHOR ROD FOR THE GUY WIRE TO THE NORTHEAST CORNER OF THE LOOKOUT TOWER. REFERENCE MARK NUMBER 2, STAMPED PEARRYGIN NO 2 1950, IS A STANDARD DISK CEMENTED IN A DRILL HOLE IN A 3 BY 5 FOOT BOULDER THAT IS USED AS A STEP FOR THE LOOKOUT TOWER STAIRS. IT PROJECTS 16 INCHES ABOVE THE GROUND AND IS 2-1/2 FEET LOWER IN ELEVATION THAN THE STATION. PEARRYGIN PEAK LOOKOUT TOWER IS A WOODEN BUILDING 14 FEET SQUARE SUPPORTED ON 4 POLE LEGS. THE TOWER IS ABOUT 40 FEET IN HEIGHT AND HAS A POINTED ROOF WITH A SPIKE ON TOP. THE DISTANCE AND DIRECTION WAS TAKEN TO THE CENTER OF THE TOWER. OLD BALDY L.O. WILL SERVE AS THE AZIMUTH MARK. THE STATION IS REACHED AS FOLLOWS--FROM THE U.S. POST OFFICE IN WINTHROP GO NORTH ON A PAVED ROAD FOR 1.6 MILES. TURN RIGHT AS PER SIGN PEARRYGIN L 1 AND GO 3.7 MILES TO A SIGN PEARRYGIN 2 - BEAR CREEK 1. TURN LEFT, NORTH, AND GO 0.1 MILE TO A FORK. CONTINUE NORTH ON THE LEFT FORK FOR 0.1 MILE. TURN RIGHT AND GO 0.6 MILE. TURN LEFT AND GO 0.1 MILE. CONTINUE STRAIGHT AHEAD, NORTH NORTHEAST, FOR 1.3 MILES TO A SIGN PEARRYGIN TRAIL AND THE END OF TRUCK TRAVEL. FROM HERE FOLLOW THE TRAIL EASTERLY FOR ABOUT 6-1/2 MILES TO THE PEARRYGIN PEAK LOOKOUT TOWER AND THE STATION. THERE ARE SIGNS ALONG THE TRAIL TO FOLLOW. APPROXIMATE TIME OF PACK IS 4 HOURS. HORSES CAN BE TAKEN TO THE TOP OF THE PEAK.
01/01/1956 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1956 RECOVERED AS DESCRIBED BY NGS. ALL MARKS IN GOOD CONDITION. LOT HAS BEEN DESTROYED BY USFS.
01/01/1961 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1961 RECOVERED AS DESCRIBED BY NGS.

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.

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