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Details for Benchmark: LW1018

N 41° 28.800 W 071° 31.250 (NAD 83)

Altitude: 240.87

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

Location:
In WASHINGTON county, RI View Original Datasheet
Designation:
569
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Documented History (by the NGS)

Unknown by RIBPR (MONUMENTED)
01/01/1969 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1969 AT KINGSTON. AT KINGSTON, AT THE JUNCTION OF STATE HIGHWAY 108 AND 138, 54 FEET EAST OF THE EXTENDED CENTER LINE OF STATE HIGHWAY 108 LEADING SOUTH, 2 FEET NORTH OF THE NORTH CURB OF STATE HIGHWAY 138, 43.3 FEET SOUTHEAST OF THE TOP OF A FIRE HYDRANT, 15 FEET WEST OF POWER LINE POLE 934, 3.5 FEET NORTHWEST OF THE SOUTHWEST CORNER OF A CONCRETE WATER DRAIN, 1/2 FOOT ABOVE THE LEVEL OF THE HIGHWAY AND SET IN THE TOP OF A CONCRETE POST FLUSH WITH THE GROUND.
03/10/1988 by RIGS (GOOD)
RECOVERY NOTE BY RHODE ISLAND GEODETIC SURVEY 1988 RECOVERED IN GOOD CONDITION.
10/01/1988 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1988 (WW) MARK NOT FOUND.
01/01/1989 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1989 (AFA) MARK NOT FOUND.
10/01/1997 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1997 MARK NOT FOUND.

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.