Skip to Content

Details for Benchmark: SQ0270

N 47° 42.583 W 107° 11.683 (NAD 83)

Altitude: 2845.17

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

Location:
In VALLEY county, MT View Original Datasheet
Designation:
CANYON AZ MK
Marker Type:
azimuth mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

Photos taken to verify location. Current data sheet Lat/Long has a 7.71 mile blunder.

[Photos:]
photo
photo
photo

This mark is on the just released NGS list of Prioritized Marks, but the current Lat/Long places it many miles away to the south of Fort Peck Reservoir at:

SQ0270* NAD 83(1986) POSITION- 47 36 03.2 (N) 107 11 59.5 (W) HD_HELD2

The original DS here is at:
SQ0270* NAD 83(1986)- 47 42 35. (N) 107 11 41. (W) SCALED

My found HH2, and recovered to NGS on 23 October 2009, is:
Lat 47 42 48.0 Long 107 11 59.5

There are no other PID's anywhere close to the current given L/L and no typo that I can figure out.

No photos were taken of this azimuth in 2009. Good excuse for a road trip if we ever get to spring time!

See SQ0271.

Documented History (by the NGS)

01/01/1948 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1948 59.2 MI S FROM GLASGOW. 9.4 MILES SOUTHEAST ALONG STATE HIGHWAY 22 FROM THE GREAT NORTHERN RAILWAY STATION AT GLASGOW, THENCE 3.1 MILES SOUTH ALONG A GRADED DIRT ROAD, THENCE 41.5 MILES SOUTHWEST ALONG A GRADED DIRT ROAD, THENCE 2.4 MILES SOUTH ALONG A GRADED DIRT ROAD, THENCE 2.8 MILES SOUTHEAST ALONG A TRAIL. 0.25 MILE NORTHWEST OF A DRY WASH CROSSING AT THE HEAD OF A ROCKY RAVINE LEADING NORTHEAST, 16.0 FEET SOUTHWEST OF THE CENTER LINE OF THE TRAIL, 4.1 FEET EAST OF A REFERENCE POST AND SET IN THE TOP OF A CONCRETE POST PROJECTIONG 0.4 FOOT ABOVE THE GROUND.

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.

Advertising with Us

Return to the Top of the Page