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Details for Benchmark: SS0546

N 47° 49.033 W 110° 40.150 (NAD 83)

Altitude: 2634.62

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

Location:
In CHOUTEAU county, MT View Original Datasheet
Designation:
FT BENTON CTHSE
Marker Type:
bolt
Setting:
set into the top of a metal pipe driven into the ground
Stability:
Mark of questionable or unknown stability.

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Driving from Fort Benton to Great Falls. Thought I would grab some of these. Most of them are easy to find.

Found after walking the River Walk, looking around town after getting an ice cream.

Had to add my name to list of infamous MORC hunters
Note from KayakBird: This station is MORC #1-2 (the first or second MORC BM set in Montana)

[This entry was edited by Okie'sKid on Sunday, April 11, 2010 at 10:42:38 AM.]

I have twice attempted to upload my own photo and got the following error msg:
Error Occurred
Sorry, you cannot upload images to logs of a locked cache.
From Gallery

[This entry was edited by Okie'sKid on Sunday, April 11, 2010 at 10:44:08 AM.]

Newly surfaced information indicates that this bench mark was set in 1885 and its position and elevation determined in 1889 or 1890.

[Photos:]
photoSS0546 MORC BM 1-2
FROM FORT BENTON DOWNSTREAM THESE WERE SET IN PAIRS: -1 ON RIVER RIGHT & -2 ON RIVER LEFT. VERY FEW OF THE SURVIVING ONES HAVE PID STATUS.
photoSS0546 MORC BM 1-2 COURT HOUSE
CHOUTEAU COUNTY, MONTANA
photoNONPID MORC BM 1-1
NEEDS A RESET
photoNONPID MORC BM 1-1
RENEWED (TO USE IBC TERMINOLOGY) 3 JULY 2010 WITH OKIE'SKID

Found it after reading the description again, saw it from the street and thought it was a water valve. Hard to believe that it has been in the lawn for 100+ years.

[Photos:]
photoFort Benton Courthouse BM - Fort Benton, MT
Fort Benton was once a thriving port at the top end of the Missouri River. Boats couldn't go much farther due to the Great Falls just upstream. Lewis and Clark were here 100 years before this mark was placed by the Missouri River Commission.
photoFort Benton Courthouse BM - Fort Benton, MT
Choteau County Courthouse - The second oldest working courthouse in Montana, 1884.

FOUND AS DESCRIBED. THE DATE OF MONUMENTATION IS UNKNOWN.CAP LOOKS LIKE SOME FROM 1889.

[Photos:]
photoFT BENTON CTHSE
photoFORT BENTON MT.
BEAUTIFUL LITTLE TOWN

Documented History (by the NGS)

Unknown by MORC (MONUMENTED)
01/01/1967 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1967 IN FORT BENTON. THE MARK IS IN THE SOUTHEAST CORNER OF THE COURTHOUSE LAWN AT FORT BENTON. IT IS 17 YARDS WEST OF THE CENTER OF FRANKLIN STREET, 18 YARDS NORTH OF THE CENTER OF 13 STREET. THE LETTERS MISSOURI RIVER COMMISSION USBM ARE CAST IN THE CAP.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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