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Details for Benchmark: RX0016

N 46° 35.333 W 112° 02.433 (NAD 83)

Altitude: 4074.17

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

Location:
In LEWIS AND CLARK county, MT View Original Datasheet
Designation:
4071
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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I found this benchmark totally by accident. I was admiring the building when I spotted it. It appears to be in perfect condition.

N 46° 35.348 W 112° 02.330

No trouble finding this one.

[Photos:]
photo4071 disk
photo4071 in context

Found at +/-5m N46 35.338 W112 02.336
Along north side of north facing wall on W 6th Ave. Between Hibbard Way and N Last Chance Gulch. Approximately 2m above street level and directly below fire escape ladder.
**Very easy to find, yet very easy to miss.

[This entry was edited by CerealBoxMonsters on Sunday, June 14, 2009 at 3:44:40 PM.]

[This entry was edited by CerealBoxMonsters on Sunday, June 14, 2009 at 3:45:19 PM.]

[Photos:]
photoRX0016

Rather high above the sidewalk.

[Photos:]
photoRX0016 GLO 1929 4071.287

Found with Son#1.

[Photos:]
photoNikon 111
photoNikon 109

Very easy to spot if you know where to look!

It's there, all right.

As luck would have it, parking was available right in front of #4071. You gotta like that.

[Photos:]
photoGood old #4071

This one is very quick and easy to find.

[Photos:]
photo"4071" benchmark.

The mark is right where the description calls for, if you take the time to read it; I didn't two years ago. The disk is approximately 4-5' above the sidewalk on the left side of the entrance into the Power Building at 7 W. Sixth St., near the Last Chance intersection.

[This entry was edited by CallawayMT on Sunday, July 15, 2007 at 4:10:54 PM.]

[Photos:]
photo4071 - Lewis & Clark County, MT
photo4071 - Lewis & Clark County, MT
photo4071 - Lewis & Clark County, MT
photo4071 - Lewis & Clark County, MT

Found set in the North wall stone work of the Powerblock Building on 6th Ave. SW of the intersection of 6th & Last Chance Gulch. SE of intersection of 6th and Fuller St.
Marked 4071. 287feet Dated 1929

[Photos:]
photo4071 set in N. wall Powerblock Bld. 6th ave

Documented History (by the NGS)

Unknown by USGLO (MONUMENTED)
01/01/1962 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1962 IN HELENA. AT HELENA, AT NUMBER 5 SIXTH AVENUE, AT THE SOUTHWEST CORNER OF THE INTERSECTION OF LAST CHANCE GULCH AND SIXTH AVENUE, SET VERTICALLY IN THE NORTH WALL.

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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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