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Details for Benchmark: RY0100

N 46° 11.933 W 114° 10.067 (NAD 83)

Altitude: 3623.36

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

Location:
In RAVALLI county, MT View Original Datasheet
Designation:
3619.85
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Found disk in great shape.

[Photos:]
photoRY0100

Found on the Highway 93 bridge over the Bitterroot River. Asphalt painted around benchmark due to construction in the area.

[Photos:]
photoRY0100 4-1-07

Found in good condtion on the southeast corner of the bridge over the Bitterroot River in the sidewalk, mark is in good condtion.

[Photos:]
photo3619.85 - Ravalli County, MT
photo3619.85 - Ravalli County, MT

Located as described.

Found early morning. Felt like taking life in hand with heavy traffic crossing the bridge.

[Photos:]
photoRY010020040803C
3619.85 Closeup, Hamiltion, MT
photoRY0100 Area View, Hamilton, MT
photoRY0100 US 93 Bridge, Hamilton, MT

It's still there!

FOUND IT IN GOOD COND.

Bitterroots--5/19/03
Found in good condition

N 46° 11.933 W 114° 10.067

Found it late in the day, its in good condition.

[Photos:]
photoMontana Latitude
Found in good condition,

Documented History (by the NGS)

Unknown by MTDH (MONUMENTED)
01/01/1965 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1965 3.6 MI S FROM HAMILTON. 3.6 MILES SOUTH ALONG U.S. HIGHWAY 93 FROM THE NORTHERN PACIFIC RAILWAY STATION AT HAMILTON, IN THE TOP AND 4 1/2 FEET SOUTHWEST OF THE NORTHEAST END OF THE SOUTHEAST CONCRETE SIDEWALK OF A 300-FOOT BRIDGE OVER BITTERROOT RIVER, 15 FEET SOUTHEAST OF THE CENTER LINE OF THE HIGHWAY, AND ABOUT 1 FOOT HIGHER THAN THE HIGHWAY.

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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