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Details for Benchmark: NG0004

N 42° 39.050 W 086° 06.450 (NAD 83)

Altitude: 599.9

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

Location:
In ALLEGAN county, MI View Original Datasheet
Designation:
Z 24
Marker Type:
bench mark disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

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Documented History (by the NGS)

01/01/1930 by CGS (MONUMENTED)
01/01/1934 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1934 0.2 MI N FROM NEW RICHMOND. 0.25 MILE NORTH ALONG THE PERE MARQUETTE RAILWAY FROM NEW RICHMOND, ALLEGAN COUNTY, 2 RAILS NORTH OF MILEPOST GR 36, AT A BRIDGE OVER KALAMAZOO RIVER, IN THE EAST END OF THE SOUTH ABUTMENT, 4.8 FEET EAST OF THE EAST RAIL, AND 3 FEET LOWER THAN THE TOP OF THE RAIL. A STANDARD DISK, STAMPED 600.589 Z 24 1930.
01/01/1974 by LOCENG (GOOD)
RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1974 RECOVERED IN GOOD CONDITION.
01/01/1984 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 RECOVERED IN GOOD CONDITION. NEW DESCRIPTION FOLLOWS. 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 1.4 KM (0.9 MI) NORTH ALONG 57TH STREET, THENCE 0.5 KM (0.3 MI) NORTH-NORTHWEST ALONG THE CHESAPEAKE AND OHIO RAILROAD TRACKS, AT THE SOUTH ABUTMENT OF A LARGE CONCRETE RAILROAD BRIDGE OVER THE KALAMAZOO RIVER, SET IN TOP OF THE EAST END OF THE SOUTH CONCRETE ABUTMENT AND ABOUT 3 FEET LOWER THAN THE TRACKS, AND 1.46 METERS (4.8 FT) EAST OF THE EAST RAIL.
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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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