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Details for Benchmark: PP1477

N 44° 44.733 W 093° 02.617 (NAD 83)

Altitude: 859.56

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

Location:
In DAKOTA county, MN View Original Datasheet
Designation:
B 27
Marker Type:
survey 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, right across from the security shack for the refinery. The area the security shack is on, is a no tresspassing area and they mean it! While grabbing a photo of the benchmark, security came up and started asking what I was doing, even though I was not on their property, and when I told the 20 year old I was getting a photo of the benchmark he then wanted to know who I work for. Being the private person that I am I was more than happy to tell him I worked for "my employer" and then continued on to my car. I think he was hoping for me to just answer any questions he had, but I have better things to do like get the next benchmark down the road a few miles. For others that look for this benchmark, it is not on the refinery property and it is only 10 to 15 feet off the road.

[Photos:]
photoPP1477

Much closer to the road than I thought

Documented History (by the NGS)

1/1/1933 by CGS (MONUMENTED)
1/1/1972 by MNDT (GOOD)
DESCRIBED BY MN DEPT OF TRANSP 1972 IN RICH VALLEY. MARK FOUND, AS DESCRIBED, IN RICH VALLEY, 0.45 MILES WEST OF TH 52, 33.8 FEET SOUTH OF THE CENTERLINE OF COUNTY ROAD 38, 51 FEET WEST OF THE WEST RAIL OF THE CHICAGO-GREAT WESTERN RAILROAD, 33 FEET SOUTHWEST OF A RAILROAD SIGNAL, 3 FEET SOUTHEAST OF A POWER POLE, 2.5 FEET SOUTHWEST OF A FENCE CORNER, 0.6 FEET SOUTHWEST OF A STEEL WITNESS POST, IN A CONCRETE MONUMENT PROJECTING 2 INCHES ABOVE GROUND. NE 1/4, SEC. 24, T115, R18.

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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