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Details for Benchmark: LW1218

N 41° 58.283 W 071° 30.833 (NAD 83)

Altitude: 304.96

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

Location:
In PROVIDENCE county, RI View Original Datasheet
Designation:
C 29
Marker Type:
bench mark disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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Documented History (by the NGS)

01/01/1969 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 4.8 MI SE FROM SLATERSVILLE. ABOUT 4.85 MILES SOUTHEAST ALONG STATE HIGHWAY 146 FROM THE CENTRAL STREET OVERPASS OVER THE HIGHWAY, ABOUT 0.3 MILE NORTHWEST OF THE JUNCTION OF THE SOUTHBOUND LANES OF HIGHWAY 146 AND 146A, ABOUT 0.85 MILE SOUTHEAST OF THE HIGHWAY OVERPASS OVER STATE HIGHWAY 104, IN THE RIGHT-OF-WAY (WEST EDGE) OF THE TWO LARGE OVERHEAD POWER LINE WHICH CROSSES OVER THE HIGHWAY, SET IN THE TOP OF THE EAST CORNER OF A TRIANGULAR SHAPED ROCK WHICH IS 10 FEET LONG-, 82 FEET SOUTHWEST OF THE CENTER LINE OF THE SOUTHBOUND LANE OF THE HIGHWAY, 22 FEET EAST OF THE EAST EDGE OF A HUGE MOUND OF ROCKS AND 2 1/2 FEET ABOVE THE LEVEL OF THE HIGHWAY. NOTE-- MARK MAY BE REACHED BY GOING 1.4 MILES SOUTH ALONG PARK AVE. FROM THE JUNCTION OF STATE HIGHWAY 122 AT WOODSOCKET, THENCE 1.0 MILE SOUTHEAST ALONG STATE HIGHWAY 146A, THENCE 0.3 MILE NORTHWEST ALONG STATE HIGHWAY 146.
01/01/1987 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1987 (RMS) MARK NOT FOUND.
06/01/1987 by RIGS (GOOD)
RECOVERY NOTE BY RHODE ISLAND GEODETIC SURVEY 1987 RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1988 (RMS) MARK NOT FOUND.
08/25/1990 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1990 (RMS) 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.

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