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Details for Benchmark: NG0424

N 42° 38.433 W 086° 06.267 (NAD 83)

Altitude: 664.19

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

Location:
In ALLEGAN county, MI View Original Datasheet
Designation:
H 319
Marker Type:
metal rod
Setting:
stainless steel rod
Stability:
Probably hold position/elevation well.

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Found the survey marker, but was unable to find the benchmark.

Documented History (by the NGS)

01/01/1984 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1984 7.6 KM (4.7 MI) NORTH FROM FENNVILLE. 0.8 KM (0.5 MI) WEST ALONG STATE HIGHWAY 89 (MAIN STREET) FROM THE POST OFFICE IN FEENVILLE, THENCE 5.1 KM (3.2 MI) NORTH ALONG 58TH STREET, THENCE 0.9 KM (0.55 MI) EAST ALONG 130TH AVENUE, THENCE 0.7 KM (0.45 MI) NORTH ALONG 57TH STREET, AT THE PROPERTY OF LESLIE EARL, ON THE EAST SIDE OF THE ROAD, 8.38 METERS (27.5 FT) EAST OF THE CENTER OF 57TH STREET, 26.97 METERS (88.5 FT) SOUTH OF THE CENTER OF THE DRIVEWAY LEADING TO THE HOUSE, 23.80 METERS (78.1 FT) SOUTHWEST OF THE SOUTHWEST CORNER OF THE HOUSE, AND 0.60 METERS (2.0 FT) NORTH OF A SHORT POWERLLINE POLE WITH A SQUARE TRANSFORMER ATTACHED. NOTE, DRIVING RATE EXCEEDED AND ROD ANCHORED. THE MARK IS 0.70 METERS NNE FROM A WITNESS POST. THE MARK IS ABOVE LEVEL WITH 57TH STREET.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (RBP) RECOVERED IN GOOD CONDITION.

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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