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Details for Benchmark: QP1900

N 45° 28.117 W 094° 21.033 (NAD 83)

Altitude: 1078.06

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

Location:
In STEARNS county, MN View Original Datasheet
Designation:
ABA RM 1
Marker Type:
reference mark disk
Setting:
aluminum alloy rod
Stability:
Probably hold position/elevation well.

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Found it 10/1/2006 msrubble found QP1900   Visit Log
State Highway 23 has been rerouted.

This reference marker is in front of the former Rockville Area Sportsmen's Club Pavilion.

I could tell that this was a reference marker, but didn't know which until I found the other one. The pointy end of the arrow on the disk is missing, but from the description of the station I determined that it is not pointing the right way anymore.

My coordinates: N 45º 28.158 W 094º 21.066.

The following has been submitted to the NGS:

IN ROCKVILLE, 0.15 MI (0.24 KM) WEST-SOUTHWEST OF THE JUNCTION OF COUNTY ROAD 8 AND COUNTY ROAD 82. THE MARK IS 56.7 FT (17.3 M) NORTH-NORTHWEST OF A STOP SIGN WITH THE BADGE BN 061875C U.S. DOT-AAR, 37.8 FT (11.5 M) NORTH-NORTHWEST OF THE NORTH RAIL OF THE NORTHERN LINES RAILWAY, 37.7 FT (11.5 M) NORTH-NORTHEAST OF ANOTHER STOP SIGN, 25.1 FT (7.7 M) EAST-NORTHEAST OF THE CENTER OF A DRIVEWAY, 17.4 FT (5.3 M) SOUTH-SOUTHEAST OF A POWER POLE AND 1.9 FT (0.6 M) SOUTHWEST OF A STEEL WITNESS POST. THE ROD IS BENT, APPROXIMATELY TWO-THIRDS OF THE DISK IS MISSING, AND THE ARROW ON THE DISK DOES NOT POINT TO THE STATION. SINCE METAL SHEAR IS VISIBLE WHERE THE DISK IS FASTENED TO THE ROD AND ON SOME EDGES OF THE DISK, THE MARKER WAS PROBABLY DAMAGED BY HEAVY MACHINERY. HH2 COORDINATES N45 28 09.4 W094 21 04.0.
[Photos:]
photoABA RM 1, Rockville, Minnesota
Eye-level view, except rod is bent. This view of the front/top of the disk shows that about two-thirds of the disk is missing. Witness post on the right.
photoABA RM 1, Rockville, Minnesota
Eye-level view, taken from slightly behind the rod. You can see that the rod is bent. Witness post at extreme left.
photoABA RM 1, Rockville, Minnesota
Closeup view. Notice shear.
photoABA RM 1, Rockville, Minnesota
Closeup view from behind disk. Notice shear.
photoABA RM 1, Rockville, Minnesota
Area view. Looking north-northeast.

Documented History (by the NGS)

1/1/1987 by MNDT (MONUMENTED)
4/25/1988 by MNDT (GOOD)
DESCRIBED BY MN DEPT OF TRANSP 1988 THE MARK IS LOCATED 0.15 MI (0.24 KM) WEST-SOUTHWEST ALONG TRUNK HIGHWAY 23 FROM ITS JUNCTION WITH COUNTY ROAD 8 AT THE WEST EDGE OF THE TOWN OF ROCKVILLE AND IS IN THE NE 1/4 OF SECTION 17, T123N, R29W. THE MARK IS NORTH-NORTHWEST OF THE CENTERLINE OF HIGHWAY 23 AT MILEPOINT 194.65, 32.0 FT (9.8 M) NORTH-NORTHWEST OF AND ABOUT 1.5 FT (0.5 M) LOWER THAN THE NORTH RAIL OF THE BURLINGTON NORTHERN RAILROAD TRACKS, 22.5 FT (6.9 M) EAST-NORTHEAST OF THE CENTER OF A DRIVEWAY, 17.0 FT (5.2 M) SOUTHEAST OF A POWER POLE AND 1.9 FT (0.6 M) WEST OF A STEEL WITNESS POST. THE MARK, A STANDARD MNDT ALUMINUM MAGNETIC REFERENCE MARK DISK STAMPED---ABA NO 1 1987---, IS FASTENED TO THE TOP OF A 3/4 INCH DIAMETER BY 38 FOOT LONG ALUMINUM ALLOY ROD DRIVEN TO REFUSAL AND PROJECTS 0.1 FT (0.03 M) ABOVE THE SURFACE OF 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 1995.
  • 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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