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Details for Benchmark: OQ0045

N 43° 36.602 W 096° 27.442 (NAD 83)

Altitude: 1448.96

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

Location:
In MINNEHAHA county, SD View Original Datasheet
Designation:
END 2
Marker Type:
horizontal control disk
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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Documented History (by the NGS)

01/01/1971 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS) THE STATION IS LOCATED ABOUT 6 MILES EAST OF CORSON, SOUTH DAKOTA, 4-3/4 MILES WEST OF BEAVER CREEK, MINNESOTA, 2 MILES NORTH OF VALLEY SPRINGS, SOUTH DAKOTA, 0.2 MILE WEST OF THE MINNESOTA-SOUTH DAKOTA STATE LINE, AT THE EAST EDGE OF A REST STOP ALONG THE NORTH SIDE OF INTERSTATE HIGHWAY 90. THE STATION MARK IS A STANDARD DISK STAMPED END 2 1971, SET IN A ROUND CONCRETE MONUMENT FLUSH WITH THE GROUND. IT IS 334 FEET NORTH OF THE CENTER OF THE WEST BOUND LANES OF HIGHWAY I-90, 3 FEET WEST OF A FENCE, AND 1.7 FEET NORTHWEST OF A METAL WITNESS POST. REFERENCE MARK NO. 3 IS A STANDARD DISK STAMPED END 2 NO 3 1971, SET IN A ROUND CONCRETE MONUMENT FLUSH WITH THE GROUND. IT IS 382 FEET NORTH OF THE CENTER OF THE WEST BOUND LANES OF THE HIGHWAY, 49 FEET NORTH OF THE METAL WITNESS POST, AND 3 FEET WEST OF A FENCE. REFERENCE MARK NO. 4 IS A STANDARD DISK STAMPED END 2 NO 4 1971, SET IN A ROUND CONCRETE MONUMENT FLUSH WITH THE GROUND. IT IS 334 FEET NORTH OF THE CENTER OF THE WEST BOUND LANES OF THE HIGHWAY, AND 51 FEET WEST OF THE FENCE. THE AZIMUTH MARK, A STANDARD MHD BENCH MARK DISK, STAMPED 6780 A 1962, IS SET IN THE TOP OF A 5-INCH SQUARE CONCRETE POST WHICH PROJECTS 4-INCHES. IT IS 65 FEET NORTH-NORTHWEST OF A LARGE BOULDER, 34 FEET EAST OF A GRADED ROAD LEADING NORTH, 25 FEET NORTH OF A GRADED ROAD LEADING EAST, AND 1.8 FEET SOUTH OF A FENCE CORNER. THE MARK WAS UNSTAMPED WHEN FIRST USED AS AN AZIMUTH MARK IN 1961. TO REACH THE STATION FROM THE CROSSROADS JUST EAST OF THE POST OFFICE IN CORSON, GO SOUTH ON STATE HIGHWAY 11 FOR 0.5 MILE TO INTERSTATE HIGHWAY 90, TURN LEFT, EAST, AND GO 5.8 MILES ON HIGHWAY I-90 TO THE REST STOP ON THE LEFT AND THE STATION AS DESCRIBED. STATION MARK END (MHD) 1961, AND REFERENCE MARK NO. 1 WERE ALSO BENCH MARKS ESTABLISHED BY THE MINNESOTA HIGHWAY DEPARTMENT. THE ELEVATIONS WERE TRANSFERRED TO THIS STATION AND R.M.S NO. 3 AND NO. 4.
01/01/1971 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 2 MI N FROM VALLEY SPRINGS. ABOUT 6 MILES EAST OF CORSON, SOUTH DAKOTA, 0.2 MILE WEST OF THE MINNESOTA-SOUTH DAKOTA STATE LINE, AT THE EAST EDGE OF A REST STOP AREA ALONG THE NORTH SIDE OF INTERSTATE HIGHWAY 90, 334 FEET NORTH OF THE CENTER OF THE WEST BOUND LANES OF HIGHWAY 90, 3 FEET WEST OF A FENCE, 1.7 FEET NORTHWEST OF A METAL WITNESS POST, AND SET IN A ROUND CONCRETE MONUMENT FLUSH WITH THE GROUND.
05/26/1991 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1991 18.9 KM (11.7 MI) EASTERLY ALONG INTERSTATE HIGHWAY 90 FROM THE JUNCTION OF INTERSTATE HIGHWAY 229 AT THE NORTHEAST EDGE OF SIOUX FALLS, NEAR THE EAST END OF A WESTBOUND REST AREA, 0.3 KM (0.2 MI) WEST OF THE MINNESOTA-SOUTH DAKOTA STATE LINE, 102.3 M (335.6 FT) NORTH OF AND LEVEL WITH THE CENTERLINE OF THE WESTBOUND LANES OF THE HIGHWAY, 64.7 M (212.3 FT) NORTH OF A FENCE CORNER, 14.6 M (47.9 FT) SOUTH OF REFERENCE MARK 3, 0.8 M (2.6 FT) WEST OF A FENCE, 0.5 M (1.6 FT) NORTHWEST OF A WITNESS POST, AND THE MONUMENT IS FLUSH WITH THE GROUND SURFACE. NOTE--THE ORIGINAL DESCRIPTION STATES THAT THE ORIGINAL DISK WAS USED, AND THE DATE 1961 WAS CROSSED OUT.
11/30/1991 by MNDT (GOOD)
RECOVERY NOTE BY MN DEPT OF TRANSP 1991 (DKH) THE MARK WAS RECOVERED IN GOOD CONDITION AS DESCRIBED. RM 3 AND RM 4 WERE CHAINED AND DISTANCES CHECK.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in January 1998. No horizontal observational check was made to the station.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in September 1993.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • 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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