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Details for Benchmark: LW1217

N 41° 58.489 W 071° 31.744 (NAD 83)

Altitude: 255.74

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

Location:
In PROVIDENCE county, RI View Original Datasheet
Designation:
B 29
Marker Type:
bench mark disk
Setting:
surrounded by a mass of concrete
Stability:
Mark of questionable or unknown stability.

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Recovered in good condition, as described.

[Photos:]
photoDisk and quarter, North Smithfield RI

Documented History (by the NGS)

01/01/1969 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 4 MI SE FROM SLATERSVILLE. ABOUT 4.0 MILES SOUTHEAST ALONG STATE HIGHWAY 146 FROM THE CENTRAL STREET OVERPASS OVER THE HIGHWAY AT SLATERSVILLE, BETWEEN THE TWO LANES OF THE HIGHWAY, SET IN THE TOP OF THE NORTHWEST END OF THE HIGHWAY OVERPASS OVER STATE HIGHWAY 104, IN THE CONCRETE WALL BETWEEN THE TWO ABUTMENTS, 27 FEET SOUTHWEST OF THE CENTER LINE OF THE NORTHBOUND LANE OF THE HIGHWAY AND 1 FOOT ABOVE THE LEVEL OF THE HIGHWAY.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (RMS) RECOVERED IN GOOD CONDITION.
01/04/1989 by RIGS (GOOD)
RECOVERY NOTE BY RHODE ISLAND GEODETIC SURVEY 1989 THE STATION IS LOCATED ABOUT 6.4 KM (4.00 MI) SOUTHEAST OF SLATERSVILLE CENTER. OWNERSHIP--STATE RIGHT OF WAY. TO REACH FROM THE RHODE ISLAND/MASSACHUSETTS STATE LINE, GO SOUTHEAST FOR 6.4 KM (4.00 MI) ON STATE HIGHWAY 146 TO THE OVERPASS OVER STATE HIGHWAY 104 AND THE STATION ON THE LEFT. IT IS 8.2 M (26.9 FT) SOUTH SOUTHWEST FROM THE CENTERLINE OF THE NORTHBOUND TRAVEL LANES OF HIGHWAY 146, 3.05 M (10.0 FT) NORTHEAST FROM THE NORTHWEST CORNER OF A CONCRETE RAIL, 1.8 M (5.9 FT) SOUTHEAST FROM A FIBERGLASS WITNESS POST, 0.35 M (1.1 FT) SOUTHEAST FROM THE GRANITE CURB ON THE NORTH SIDE.
08/25/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (RMS) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in August 1998.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • 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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