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Details for Benchmark: RX0911

N 46° 19.740 W 112° 27.241 (NAD 83)

Altitude: 8602

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

Location:
In POWELL county, MT View Original Datasheet
Designation:
THUNDERBOLT LO RESET
Marker Type:
survey disk
Setting:
setting not listed - see description
Stability:

Reference Points

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Found it while on a backpacking trip.

This one took a bit of work to get to, about 7-8 miles of hiking, one way. Disk is in perfect shape. Found along with Boy Scout Troop 206. Can see the Anaconda Stack from up here.

[Photos:]
photoThunderbolt LO Reset, POWELL county, MT
Disk is stampede Thunderbolt 1949 as stated in the description.

Documented History (by the NGS)

1/1/1952 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1952 STATION LIES 10.0 MI. NW. (AIRLINE) FROM BASIN, MONTANA, ON THUNDERBOLT MOUNTAIN ON CONTINENTAL DIVIDE AND NEAR 1/4 SECTION CORNER BETWEEN SECS. 26 AND 27, T 7 N, R 7 W. TO REACH STATION FROM BOULDER, MONTANA, GO 12.8 MI. W. ON U.S. HIGHWAY 91 TO BOULDER RIVER ROAD NO. 82, TURN RIGHT (W.) 5.2 MI. ALONG RD. TOWARD DEERLODGE TO ALTA GULCH ROAD, TURN RIGHT (N.) ALONG RD. 1.1 MI. TO RD. FORK, TAKE LEFT FORK 3.0 MI. TO RD. FORK AT --L. O. TRAIL-- SIGN, TURN RIGHT (N.) 0.3 MI. ALONG TRAIL TO END OF TRUCK TRAVEL. PROCEED ALONG WALL MARKED TRAIL TO L. O. TOWER AND STATION SITE. ABOUT 2-HOUR BACK PACK. IN DRY WEATHER A MILITARY JEEP CAN BE DRIVEN TO HORSE PASTURE JUST W. OF L. O. - A 15-MINUTE PACK. STATION MARK--A STANDARD USFS TABLET, STAMPED ---THUNDERBOLT L. O. 1949---. NOTE--THIS TABLET IS NO LONGER UNDER THE CENTER OF THE L. O. TOWER AS ORIGINALLY SET BY THE USFS. TABLET HAD BEEN BROKEN LOOSE AND USGS RESET TABLET (1952) IN SOLID ROCK. SIGNAL IS DIRECTLY OVER TABLET, 1 FT. SW. OF CENTER OF L. O. BUT NOT UNDER CENTER OF L. O. TOWER. REFERENCE MARKS--NONE.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in July 1992.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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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