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Details for Benchmark: NG0420

N 42° 40.917 W 086° 05.633 (NAD 83)

Altitude: 716.93

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

Location:
In ALLEGAN county, MI View Original Datasheet
Designation:
X 319
Marker Type:
metal rod
Setting:
stainless steel rod in sleve
Stability:
Most reliable and expected to hold position/elevation well.

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Good condition. N .910 W .582 Post - no, flush.

Had to search around a bit for this one. It's right there in the little park by the sign and flagpole. It was almost covered with grass.

[Photos:]
photoX319 closeup
East Saugatuck, MI
photoX319 with sign and flagpole in background
East Saugatuck, MI

Documented History (by the NGS)

01/01/1984 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1984 11.3 KM (7.05 MI) NORTH FROM FENNVILLE. 0.8 KM (0.5 MI) WEST ALONG STATE HIGHWAY 89 FROM THE POST OFFICE IN FENNVILLE, THENCE 8.8 KM (5.5 MI) NORTH ALONG 58TH STREET, THENCE 1.68 KM (1.05 MI) EAST ALONG 136TH AVENUE TO A T-JUNCTION OF 56TH STREET LEADING NORTH AND EAST SAUGATUCK CIVIC ASSOCIATION COMMUNITY PARK ROAD LEADING SOUTH, 21.46 METERS (70.4 FT) SOUTH OF THE CENTERLINE OF 136TH AVENUE, 18.14 METERS (59.5 FT) WEST OF THE CENTER OF A GRAVEL ROAD LEADING SOUTH INTO THE PARK, 9.49 METERS (31.0 FT) EAST OF AN EXTENDED CENTERLINE OF 56TH STREET LEADING NORTH, 3.87 METERS (12.7 FT) NORTHEAST OF A FLAGPOLE, AND 1.37 METERS (4.5 FT) EAST-NORTHEAST OF THE NORTHEAST EDGE OF A PLANTER. THE MARK IS ABOVE LEVEL WITH 136TH AVENUE.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (RBP) RECOVERED IN GOOD CONDITION.
08/17/1995 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1995 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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