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Details for Benchmark: TP1198

N 48° 57.445 W 119° 47.085 (NAD 83)

Altitude: 7887

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

Location:
In OKANOGAN county, WA View Original Datasheet
Designation:
CHOPAKA CD US
Marker Type:
alumnium marker (other than a disk)
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

Reference Points

Must Read!

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Enjoyed the day, first Benchmark for us.
Noot & Foxylady

Definitely a 1904 disk as there isn't much to it, but it is still there and in great shape.

[Photos:]
photoTP1198
photoRory on Top

Documented History (by the NGS)

01/01/1904 by IBC (MONUMENTED)
DESCRIBED BY INTERNATIONAL BOUNDARY COMMISSION 1904 (ECB) ON THE HIGHEST PEAK OF THE BIG CHOPAKA MOUNTAIN, ABOUT 2-1/2 MILES SOUTH OF THE INTERNATIONAL BOUNDARY, AND ABOUT 3-1/2 MILES WEST OF THE SIMILKAMEEN RIVER. THIS PEAK IS ABOUT 2 MILES NORTHWEST OF THE PEAK THAT IS LOCALLY KNOWN AS CHOPOKA MOUNTAIN. THE STATION IS ON THE BALD AND ROCKY SUMMIT. IT HAS HERETOFORE BEEN APPROACHED FROM LOOMIS, WASHINGTON, WHICH IS ABOUT 1.5 MILES BY ROAD AND TRAIL TO THE SOUTHEAST OF THE STATION. STATION MARK--AN ALUMINUM DISK MARKED---U.S. AND C.B.---SET IN THE SOLID ROCK WITH A CAIRN BUILT OVER IT.
01/01/1925 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1925 STATION MARK--AN ALUMINUM DISK MARKED U.S. AND C.B. SET IN SOLID ROCK WITH A CAIRN BUILT OVER IT. GEODETIC SURVEY ESTABLISHED A FIRST - ORDER TRIANGULATION STATION ON THE SAME PEAK 3.89 METERS, IN BEARING 79 DEGREES 34, MINUTES FROM THE THE ORIGINAL STATION MARK. THEIR STATION MARK IS A STANDARD USC AND GS BRONZE - DISK STATION MARK WEDGED IN A DRILL HOLE IN OUTCROPPING BEDROCK. A STANDARD USC AND GS BRONZE - DISK REFERENCE MARK WITH THE ARROW POINTING TOWARD THE STATION IS WEDGED IN A DRILL HOLE IN OUTCROPPING BEDROCK 8.87 METERS FROM THE USC AND GS STATION IN BEARING 2 DEGREES 51 MINUTES 30 SECONDS.
01/01/1935 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1935 RECOVERED AS DESCRIBED.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in December 1991.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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