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Details for Benchmark: AB9593

N 44° 31.583 W 073° 15.267 (NAD 83)

Altitude: 121.48

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

Location:
In CHITTENDEN county, VT View Original Datasheet
Designation:
C95000
Marker Type:
survey disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

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easy to find. please not in area photo there's a guy riding his bicycle on the river in the background. that's pretty gutsy- it's been warm this week and ice is breaking up.

[Photos:]
photomark
photoarea
please note guy on bike.

Documented History (by the NGS)

01/01/1995 by VTAT (MONUMENTED)
DESCRIBED BY VERMONT AGENCY OF TRANSPORTATION 1995 (CHR) GENERAL LOCATION, COLCHESTER, VT. IN THE TOP OF THE ABUTMENT AT THE NORTHWEST CORNER OF THE VT ROUTE 127 BRIDGE OVER THE WINOOSKI RIVER (HEINEBURG BRIDGE). THE MARK IS 1.5 M (4.9 FT) SOUTH OF THE NORTH END OF THE ABUTMENT AND 0.25 M (0.82 FT) EAST OF THE WEST EDGE OF THE ABUTMENT. NOTE, MARK IS SUITABLE FOR GPS BUT HAS A VERY DIFFICULT TRIPOD SET-UP.

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 January 1997.
  • 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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