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Details for Benchmark: ON0260

N 43° 49.467 W 091° 18.167 (NAD 83)

Altitude: 658.33

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

Location:
In HOUSTON county, MN View Original Datasheet
Designation:
2801 Z
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Found as described. Much easier when the weeds are down. This bridge is slated for replacement in the next few years. I am not sure if the mark will be destroyed at that time though.

[Photos:]
photoON0260 2801 Z, Houston County, MN Disk
photoON0260 2801 Z, Houston County, MN Location

Found it. In good condition, covered pretty well with weeds. If not for the text description, I probably wouldn't have found it as the coordinates are WAY off. If you want to find this, use these coordinates: N43 49.500 W91 18.183

[Photos:]
photoClose up of Disk
photoDisk with Sign
Here is a dead give away for when you get close.

Documented History (by the NGS)

01/01/1965 by MNHD (MONUMENTED)
01/01/1970 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1970 AT LA CRESCENT. AT LA CRESCENT, 90 FEET SOUTH OF THE CENTER OF THE U.S. HIGHWAYS 14, 16 AND 61 OVERPASS FOR THE CHICAGO, MILWAUKEE, ST. PAUL AND PACIFIC RAILROAD, 58.0 FEET SOUTHEAST OF THE SOUTH END OF THE WEST CONCRETE ABUTMENT OF THE OVERPASS, 31 1/2 FEET WEST OF THE CENTER LINE OF A PAVED ROAD, 2.4 FEET SOUTH OF THE SOUTH END OF THE BOTTOM CONCRETE STEP IN A CONCRETE STAIRWAY, 2.0 FEET NORTHEAST OF A METAL WITNESS POST, ABOUT 25 FEET BELOW THE LEVEL OF THE HIGHWAY, AND SET IN THE TOP OF A CONCRETE POST WHICH PROJECTS 2 INCHES. SEC. 10, T104N, R 4W
01/01/1985 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1985 RECOVERED IN GOOD CONDITION. THE STAMPING WAS REPORTED AS--2801 Z 1956 BUT IS 2801 Z 1956.
08/06/1990 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990 IN LA CRESCENT, AT THE INTERSECTION OF SOUTH CHESTNUT STREET, U.S. HIGHWAYS 14 AND 61, AND STATE HIGHWAY 16, 27.2 M (89.2 FT) SOUTHWEST OF THE CENTER OF THE HIGHWAYS, 20.6 M (67.6 FT) SOUTHWEST OF THE MOST SOUTHERLY OF 4 PIERS OF AN OVERPASS, 9.6 M (31.5 FT) WEST OF THE CENTER OF THE STREET, 0.7 M (2.3 FT) SOUTH OF THE BOTTOM STEP OF A STAIRWAY LEADING TO THE OVERPASS, 0.6 M (2.0 FT) NORTHEAST OF A WITNESS POST, 0.3 M (1.0 FT) ABOVE THE LEVEL OF THE STREET, AND THE MONUMENT IS FLUSH WITH THE GROUND SURFACE.

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.

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