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Details for Benchmark: TN0907

N 48° 21.670 W 115° 07.068 (NAD 83)

Altitude: 5438

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

Location:
In LINCOLN county, MT View Original Datasheet
Designation:
SUGARLOAF
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Documented History (by the NGS)

01/01/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 (OSR) STATION IS ABOUT 20 MILES EAST AND 2 MILES SOUTH OF LIBBY, 3 MILES WEST OF THE CONFLUENCE OF WEST DRY FORK AND DRY FORK CREEKS AND 3-1/2 MILES WEST OF FAIRVIEW GUARD STATION. IT IS ON THE HIGHEST POINT OF SUGARLOAF MOUNTAIN. NEAR THE CENTER OF SECTION 13, T 30 N, R 27 W. TO REACH FROM THE FAIRVIEW GUARD STATION, FOLLOW TRAIL NUMBER 142 AND SIGNS SUGARLOAF L.O.T., WESTERLY AND NORTHERLY FOR 7 MILES TO THE HIGHEST POINT AND STATION. IT IS NEAR THE REMAINS OF A LOOKOUT HOUSE. ABOUT A 2 HOUR HORSE PACK. STATION MARK IS A STANDARD DISK, STAMPED SUGARLOAF 1959, CEMENTED IN A DRILL HOLE IN OUTCROPPING BEDROCK PROJECTING 5 INCHES. IT IS ON THE HIGHEST POINT AND AT THE SOUTHEAST EDGE OF THE REMAINS OF THE LOOKOUT HOUSE. REFERENCE MARK 1 IS A STANDARD DISK, STAMPED SUGARLOAF NO 1 1959, CEMENTED IN A DRILL HOLE IN OUTCROPPING BEDROCK PROJECTING 3 INCHES. IT IS ABOUT 3 FEET LOWER THAN THE STATION. REFERENCE MARK 2 IS A STANDARD DISK, STAMPED SUGARLOAF NO 2 1959, CEMENTED IN A DRILL HOLE IN OUTCROPPING BEDROCK PROJECTING 2 INCHES. IT IS ABOUT 5 FEET LOWER THAN THE STATION. AZIMUTH MARK IS A STANDARD DISK, STAMPED SUGARLOAF 1959, CEMENTED IN A DRILL HOLE IN A 3 X 2 FOOT BOULDER PROJECTING 4 INCHES. IT IS 16 FEET SOUTHWEST OF A 10 INCH PINE TREE WITH A TRIANGLE BLAZE ON THE SOUTHWEST SIDE AND 4 FEET EAST OF THE CENTER OF TRAIL NUMBER 142. TO REACH THE AZIMUTH MARK FROM THE STATION, GO SOUTH ON TRAIL NUMBER 142 FOR ABOUT 1/2 MILE TO TRIANGLE BLAZED TREE AND THE AZIMUTH MARK.
01/01/1963 by USGS (GOOD)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1963 (JTD) STATION MARK- STANDARD USC AND GS DISK STAMPED -SUGARLOAF 1959- CEMENTED IN DRILL HOLE IN OUTCROPPING BEDROCK.

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.