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Details for Benchmark: FC1288

N 35° 02.767 W 085° 18.833 (NAD 83)

Altitude: 701.07

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

Location:
In HAMILTON county, TN View Original Datasheet
Designation:
N 245
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Still there and in good condition.

[Photos:]
photoC:\Documents and Settings\Phillip\My Documents\My
photoC:\Documents and Settings\Phillip\My Documents\My
N 35° 02.776 W 085° 18.839

Bench mark disk is in very good condition.

Documented History (by the NGS)

01/01/1961 by CGS (MONUMENTED)
01/01/1962 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1962 IN CHATTANOOGA. TO REACH THE MARK FROM THE BRIDGE ON THE INTERSTATE HIGHWAY OVER BROAD STREET GO NORTHWEST ON THE EXPRESSWAY TO THE MARK SET IN THE SOUTHEAST WINGWALL OF A BRIDGE OVER WEST 9TH STREET, 25 FEET EAST OF CENTER LINE OF NORTHWEST BOUND LANES, 0.8 FEET EAST OF GUARD RAIL. A STANDARD DISK DRILLED IN A CEMENT BRIDGE AND IS ABOUT 6 INCHES ABOVE THE LEVEL OF THE ROAD.
01/01/1983 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1983 RECOVERED IN GOOD CONDITION.
01/01/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (KMS) 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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