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Details for Benchmark: SS0305

N 47° 01.917 W 110° 46.833 (NAD 83)

Altitude: 4933.59

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

Location:
In CASCADE county, MT View Original Datasheet
Designation:
H 191
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Just a baby FOUND by accident after spotting the BM painted on the rock. It is 950 feet SSE of the DS L/L.

[Photos:]
photoSS0305 H 191 1961
photoSS0305 PAINTED BM ON ROCK
NOT MENTIONED IN THE DS
photoSS0305 PAINT AND MARK
ABOUT 2 FT DOWN AND 3 FT LEFT
photoSS0305 S TO A 140
SS0304 BEARS 159 DEGREES 113 FT

Documented History (by the NGS)

01/01/1961 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1961 5.6 MI SE FROM MONARCH. ABOUT 5.6 MILES SOUTHEAST ALONG U.S. HIGHWAY 89 FROM THE DISTRICT 23 SCHOOL AT MONARCH, IN SECTION 25, T 15 N, R 7 E, 0.75 MILE SOUTHEAST OF THE JUNCTION OF HIGHWAY 89 AND THE ROAD LEADING TO THE SUN MOUNTAIN RANCH, 80 FEET NORTHEAST OF THE CENTER LINE OF THE ROAD, SET IN THE BASE OF A SOLID ROCK CLIFF, 120 YARDS NORTHWEST OF A FOOT BRIDGE OVER BELT CREEK LEADING TO THE CAMP ROTARY RECREATIONAL AREA, AND ABOUT LEVEL WITH THE ROAD.

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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