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Details for Benchmark: RX1016

N 46° 30.198 W 113° 52.914 (NAD 83)

Altitude: 6739

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

Location:
In RAVALLI county, MT View Original Datasheet
Designation:
AMBROSE
Marker Type:
triangulation station disk
Setting:
setting not listed - see description
Stability:
Mark of questionable or unknown stability.

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I had to come see the old tower for myself. SquareNail neglected to mention that there is no good way to approach this station, downfall and brush from the West(my approach) and worse yet from the North(my descent). No problem finding the monument directly under the tower, the brush and trees have taken over the sight and the old roads used by the Triangulation crew. The tower is in fair condition for being 45 years old, but definitely not OSHA approved at this time. No view to be had as can be seen in all photos. This was worth the drive and .35 mile hike just to see the tower workmanship.

[Photos:]
photoAmbrose - Ravalli County, MT
photoAmbrose - Ravalli County, MT
Triangulation tower bottom half.
photoAmbrose - Ravalli County, MT
Triangulation tower top half.
photoAmbrose - Ravalli County, MT
Tower from a different view.
photoAmbrose - Ravalli County, MT
Triangulation tower one more view.

Found in good condition. This has been on my to do list for over a year. I found a photo of a structure on a lookout tower web site that was being refered to as a "crude lookout tower platform". It looked to me more like what I have seen constructed over tri stations to gain the altitude for proper observation. The snow is not totally gone yet on the North slopes so It made a rather tough climb of .4 miles from the truck. It was neat to see that the old structure was still standing. I don't think it was a "lookout tower". I'll include a 1979 photo as well as current ones. Also noticed that there is not a triangle on the quad map of this mountain top. Why is that I wonder?

[Photos:]
photoAmbrose
This is what it looks like today
photoAmbrose
This is the 1979 photo of a "lookout tower"
photoAmbrose 1957

Documented History (by the NGS)

01/01/1957 by USGS (MONUMENTED)
DESCRIBED BY US GEOLOGICAL SURVEY 1957 STATION IS LOCATED IN THE SE. CORNER OF SEC. 29, T 9 N, R 18 W, APPROXIMATELY 10 MI. E. OF STEVENSVILLE AND 13 MI. SE. OF FLORENCE, ON THE W. SLOPE OF THE BITTERROOT DIVIDE AT THE HEAD OF SLOCUM CREEK AND AMBROSE CREEKS. TO REACH THE STATION FROM STEVENSVILLE, MONTANA, GO S. ON MAIN STREET 0.7 MI. TO T-RD. E. (BURNT FORK ROAD), LEFT 7.2 MI. TO T-RD. LEFT (SLOCUM CREEK ROAD), LEFT 0.9 MI. TO RD. FORK, RIGHT 0.9 MI. TO ANOTHER RD. FORK, LEFT 0.6 MI. TO RD. FORK, LEFT 0.9 MI. TO A RD. FORK, RIGHT 1.3 MI. TO A RD. FORK, LEFT 0.4 MI. TO THE END OF THE LOGGING RD. NOW PROCEED ON TRAIL THRU TREES .15 MI. S. TO TOP OF RIDGE OF HILL AND STATION MARK. STATION MARK IS 1010 FT. E. OF A LOGGING TRAIL, 590 FT. UPHILL AND N. OF MAIN LOGGING RD., 410 FT. FROM THE END OF THE LOGGING TRAIL N. A 36 FT. WOODEN TOWER WAS BUILT TO CLEAR ALL STATIONS THROUGH LODGE POLE PINE TIMBER. A ROCK PILE IS COLLECTED ON TOP OF THE STATION MARK. STATION MARK--A STANDARD TABLET CEMENTED IN THE TOP OF A BURIED ROCK FLUSH WITH THE GROUND, STAMPED---AMBROSE 1957---. 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.