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Details for Benchmark: TH0829

N 48° 59.957 W 105° 09.748 (NAD 83)

Altitude: 2457

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

Location:
In SHERIDAN county, MT View Original Datasheet
Designation:
BOUNDARY MON 546 A
Marker Type:
concrete post
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Pulled back up to scab on a GE screen shot of PIDs in Canada north of Eastern Montana and Western North Dakota.

[Photos:]
photoPID's in CANADA

Photos from the US side this trip.

[Photos:]
photoTH0829-IBC 546 A 1937-4371
photoTH0829-WNW-4372
photoTH0829-ENE-4373

Did not see any "moss" on this 'ORNAMENTAL CONCRETE OBELISK'.

[Photos:]
photoU.S.& C. B. SURVEY
PID'd IN CANADA. LEFT MY TWO BITS WORTH.
photoROCK RING
photoTH0829 IBC 546 A W
photoNONPID IBC 545 B UNK
NEWER STAINLESS STEEL OBELISK, BASE WAS RENEWED IN 2002

Located on West side of Road at International Border Crossing of Whitetail, Montana USA, and Big Beaver, Saskatchewan CANADA Ports of Entries. Surrounded by weeds, 30% covered by moss, but clearly visible when crossing.

Documented History (by the NGS)

01/01/1937 by IBC (MONUMENTED)
DESCRIBED BY INTERNATIONAL BOUNDARY COMMISSION 1937 (DFC) THIS MONUMENT IS AN ORNAMENTAL CONCRETE OBELISK SET IN A PLAIN CONCRETE BASE. THE SURFACE OF THE OBELISK OR SHAFT IS FINISHED IN LIGHT - COLORED GRANULAR QUARTZ AGGREGATE, WASHED FREE OF CEMENT SO THAT THE COLOR AND TEXTURE OF THE COARSE GRANULAR AGGREGATE SHOWS CLEAN. THE SHAFT IS 6 FEET 6 INCHES IN LENGTH AND PROJECTS 5 TO 5-1/2 FEET ABOVE THE BASE. IT IS 14 INCHES SQUARE AT THE BASE AND TAPERS TO A CROSS - SECTION OF 8 INCHES SQUARE AT THE TOP, AND IS CAPPED BY A PYRAMID 4 INCHES IN HEIGHT. IT IS REINFORCED WITH FOUR 1/2 - INCH STEEL RODS EXTENDING THROUGHOUT ITS LENGTH. THE BASE OF THE MONUMENT IS 3 FEET 4 INCHES SQUARE. THE TOP SURFACE OF THE BASE SLOPES AWAY FROM THE SHAFT UNIFORMLY ON EACH SIDE 4 INCHES TO THE FOOT. THE BASE PROJECTS ABOUT 4 INCHES ABOVE THE SURROUNDING GROUND SURFACE AND EXTENDS DOWN TO A FIRM FOUNDATION NOT LESS THAN 3 FEET 6 INCHES BELOW THE GROUND SURFACE UNLESS SOLID ROCK FORMATION IS ENCOUNTERED AT A LESSER DEPTH. THE BASE IS CONSTRUCTED OF 1--2--4 CONCRETE. THE INSCRIPTIONS ON THE SHAFT OF THE MONUMENT ARE CAST IN BLACK AGGREGATE FLUSH WITH THE SURFACE. THEY READ VERTICALLY UPWARD AND ARE AS FOLLOWS--ON THE SIDE FACING THE HIGHWAY---INTERNATIONAL BOUNDARY---, ON THE SIDE AWAY FROM THE HIGHWAY---TREATY OF 1925---, ON THE NORTH SIDE---CANADA---, ON THE SOUTH SIDE---UNITED STATES---. THE NUMBER OF THE MONUMENT IS ENGRAVED IN THE TOP SURFACE OF THE BASE, SET ON THE STRAIGHT - LINE COURSE OF THE BOUNDARY BETWEEN MONUMENTS 546 AND 547, ON THE WEST SIDE OF THE PUBLIC ROAD, TO MARK THE BOUNDARY CROSSING ON THE HIGHWAY MONTANA NO 13, SASKATCHEWAN NO 34, BETWEEN WHITETAIL, MONTANA, AND BIG BEAVER, SASKATCHEWAN.
01/01/1941 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1941 RECOVERED IN GOOD CONDITION.
01/01/1956 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1956 RECOVERED IN GOOD CONDITION.
01/01/1965 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1965 RECOVERED IN GOOD CONDITION.
01/01/1971 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1971 RECOVERED IN GOOD CONDITION.
01/01/1975 by IBC (GOOD)
RECOVERY NOTE BY INTERNATIONAL BOUNDARY COMMISSION 1975 (FXP) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in July 1992.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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