Skip to content

Details for Benchmark: QX0420

N 45° 55.767 W 111° 30.283 (NAD 83)

Altitude: 4041.86

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

Location:
In GALLATIN county, MT View Original Datasheet
Designation:
G 4
Marker Type:
pipe cap
Setting:
set into the top of a metal pipe driven into the ground
Stability:
Mark of questionable or unknown stability.

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.

A couple of pictures from 2010 show the fragile status of MORC NB after ice jam flooding that spring. And the aftermath of a record water year in 2011. Wish that I had loaded it in a kayak and hauled it out for safe keeping until an interpretive kiosk was made available.

[Photos:]
photoaka QX0420 1907 PLN G 4
photoMORC NB Stone
About to be gone!
photoLong gone MORC NB
Top of bucket at L/L & approx elevation.

I WAS INVOLVED IN THE INITAL RECOVERY OF 02 2009. I AM QUITE CERTAIN THE MONUMENT WAS TAKEN OUT BY THE SPRING RUNOFF.

[Photos:]
photo LOCATION
G4 - GALLATIN CO. MT
N 45° 55.768 W 111° 30.233

A small expedition of curious seekers found this monument using current survey grade GPS techniques. This monument was placed as the North Base of the Gallatin Baseline by the Missouri River Commission. The baseline measurements were observed on July 19, 1890. The coordinates above were computed and are accurate to within 4 centimeters relative to the national spatial system.

This mark was re-used by the 1907 US Coast and Geodetic Surveys high precision level surveys.

The cast iron pipe and cap was placed over an 18x18x4 inch thick stone marked with a US, Triangle and Drill Hole which is approximately 3 feet below the ground surface.

The mark is in excellent condition.

[Photos:]
photoG 4 - MORC North Base - Gallatin County, MT
photoG 4 - MORC North Base - Gallatin County, MT
photoG 4 - MORC North Base - Gallatin County, MT
photoG 4 - MORC North Base - Gallatin County, MT
photoMORC South Base - Gallatin County, MT
photoMORC South Base - Gallatin County, MT
photoMORC South Base - Gallatin County, MT

Very old numbers with the magic of survey grade GPS put us right there.

[Photos:]
photoA BIT OF SAND COVERS THE UNDERGROUND MORC STONE
photoQX0420-G 4-1123

I was hoping to get another of the 1907 PRECISE LEVEL NET points; but 3 inches of snow and deeper drifts means another visit in the spring.

Maybe outdooralabama could provide a bit more information on his 2008 FOUND log. Type of mark, Lat/Long, nearby features, etc. Thanks.

[This entry was edited by kayakbird on Saturday, January 03, 2009 at 8:45:45 AM.]

[This entry was edited by kayakbird on Sunday, January 04, 2009 at 9:04:30 PM.]

Found by accident on a trip to Missouri Headwaters State Park. Not sure if I'm logging the correct one or not since this page indicates it's missing, so someone correct me if I'm wrong.

Documented History (by the NGS)

Unknown by LOCENG (MONUMENTED)
01/01/1958 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1958 5.8 MI NW FROM LOGAN. ABOUT 3.65 MILES NORTHWEST ALONG THE NORTHERN PACIFIC RAILWAY FROM THE STATION AT LOGAN, THENCE 2.05 MILES NORTH ALONG AN ASPHALT ROAD TO TRIDENT, IN SECTION 17, T 2 N, R 2 E, ABOUT 0.1 MILE NORTHWEST OF THE ASPHALT ROAD, 65 YARDS NORTHWEST OF A TRAIL ROAD, 49 FEET SOUTHEAST OF A DRY RIVER BED, 3 1/2 FEET WEST OF A WHITE WOODEN WITNESS POST, AND ON THE TOP OF A 4-INCH IRON PIPE WHICH PROJECTS 2 INCHES.
01/01/1984 by USGS (MARK NOT FOUND)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1984 MARK NOT FOUND.

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