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Details for Benchmark: SS1368

N 47° 30.433 W 111° 15.800 (NAD 83)

Altitude: 3440.06

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

Location:
In CASCADE county, MT View Original Datasheet
Designation:
GREAT FALLS B UWI
Marker Type:
gravity station disk
Setting:
mat foundation, concrete slab, etc.
Stability:
May hold, but of type commonly subject to surface motion.

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I think it has been paved over

Just wanted to say that the hand held co-ordinates provided by Seventhings was a huge help.

Found after running in the Ice Breaker Run.

Found it as listed after running in the ICE BREAKER 3 mile run. But what is a Gravity Station?

[Photos:]
photoGreat Falls B - Gravity Station

still there

Not too hard to locate with the latest directions.

[Photos:]
photoFebruary 2007 148.jpg
photoFebruary 2007 150.jpg

Found as described, sort of. The disk is about 150 feet east of the centerline of 25th Street, about 36 feet east of the southwest corner of the school, and at handheld coordinates N47-30.447 W111-15.820. The school has been expanded toward the northeast, so I would call this door the SOUTHWEST entrance to the school, not the SOUTHEAST, as described.

[Photos:]
photoSS1368 - the Mark
photoSS1368 in Great Falls, MT
Looking north, the disk is at the white notebook, center. Note the school extending to the north and east, right background.

Found as described in good condition.

[Photos:]
photoGreat Falls B
photoIn the doorway

Documented History (by the NGS)

Unknown by UWI (MONUMENTED)
01/01/1980 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1980 IN GREAT FALLS. AT THE INTERSECTION OF 26TH STREET AND 2ND AVENUE NORTH, AT THE SOUTH ENTRANCE TO THE ROOSEVELT SCHOOL, IN THE NORTHEAST CORNER OF THE STEP LANDING OF THE ENTRY WAY, 85.3 METERS (280 FT) WEST OF THE CENTER OF 26TH STREET AND 36.0 METERS (118 FT) NORTH OF THE CENTER OF 2ND AVENUE NORTH. NOTE=THIS IS AN UNSTAMPED UNIVERSITY OF WISCONSIN SURVEY DISK. THE MARK IS ABOVE LEVEL WITH ROAD SURFACE.
01/01/1982 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982 RECOVERED IN GOOD CONDITION. NEW DESCRIPTION FOLLOWS. IN GREAT FALLS, AT THE INTERSECTION OF 2ND AVENUE EASTH AND 25TH STREET EASTH AT THE SOUTHEAST ENTRANCE TO THE ROOSEVELT SCHOOL, 18.3 METERS (60 FT) NORTH OF THE CENTER OF 2ND AVENUE NORTH, 0.46 METER (1.5 FT) WEST OF THE EAST CORNER OF THE BUILDING. 18 CM ABOVE GROUND LEVEL, UNDER THE OVERHANGING ENTRANCE PORCH. THE MARK IS ABOVE LEVEL WITH LANDING.

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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