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Details for Benchmark: LW0690

N 41° 29.500 W 071° 28.767 (NAD 83)

Altitude: 68.19

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

Location:
In WASHINGTON county, RI View Original Datasheet
Designation:
C 23
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Documented History (by the NGS)

01/01/1969 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 2.4 MI E FROM KINGSTON. 2.35 MILES EAST ALONG STATE HIGHWAY 138 FROM THE JUNCTION OF STATE HIGHWAY 108 AT KINGSTON, 1.2 MILES WEST OF U.S. HIGHWAY 1, SET ON THE TOP OF THE WEST END OF THE NORTH CONCRETE HEAD WALL OF A 6-FOOT CONCRETE BOX CULVERT WITH WING WALLS, 19.5 FEET NORTH OF THE CENTER LINE OF THE HIGHWAY AND LEVEL WITH THE HIGHWAY.
01/01/1987 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1987 (AFA) MARK NOT FOUND.
01/01/1989 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1989 (AFA) MARK NOT FOUND.
07/29/1995 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1995 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.