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Details for Benchmark: FC1291

N 35° 03.100 W 085° 18.817 (NAD 83)

Altitude: 725.28

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

Location:
In HAMILTON county, TN View Original Datasheet
Designation:
FOURTH RM 2
Marker Type:
reference mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found bent up a bit (looks like traffic exiting US 27 occasionally ride the inside curb of the exit lane), three feet west-southwest of the west edge of a storm drain, and at handheld coordinates N35-03.095 W085-18.854. The described highway sign is no longer in the vicinity, but the light pole is.

[This entry was edited by seventhings on Sunday, January 16, 2005 at 9:30:47 AM.]

[Photos:]
photoFC1291 - the Mark
photoFC1291 in Chattanooga, TN
Looking southwest from near the station, the RM2 is at the white notebook, center.

Documented History (by the NGS)

01/01/1962 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1962 IN CHATTANOOGA. AT THE FOURTH STATION SITE, 97.8 FEET SOUTHWEST OF THE STATION, 37.5 FEET SOUTHWEST OF A METAL STREET LIGHT POLE, 24.4 FEET SOUTHWEST OF A HIGHWAY SIGN, 12.6 FEET NORTH OF THE CENTER OF THE EXIT ROAD. A STANDARD REFERENCE MARK DISK SET IN A DRILL HOLE IN THE CURVED CURB OF THE 4TH STREET EXIT FROM THE INTERSTATE HIGHWAY.
01/01/1983 by USPSQD (POOR)
RECOVERY NOTE BY US POWER SQUADRON 1983 MARK RECOVERED IN POOR 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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