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Details for Benchmark: LW1220

N 41° 58.817 W 071° 30.817 (NAD 83)

Altitude: 314.93

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

Location:
In PROVIDENCE county, RI View Original Datasheet
Designation:
D 29
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Tried looking for this today but was unable to find.

These buildings might still be there with different names, ie the candy store might be the real estate office, but the bedrock eluded me. The coords put it on the median, and I'd bet the road has been improved since the description was written.

Documented History (by the NGS)

01/01/1969 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 1.6 MI SE FROM WOONSOCKET. ABOUT 1.4 MILES SOUTH ALONG PARK AVENUE FROM THE JUNCTION OF STATE HIGHWAY 122 AT WOONSOCKET, THENCE ABOUT 0.2 MILE SOUTHEAST ALONG STATE HIGHWAY 146A, AT PARK SQUARE MEDICAL CENTER, ABOUT 50 YARDS SOUTHEAST OF THE OLD STONE BANK BUILDING WHICH IS A COMPLEX OF THE MEDICAL CENTER, 58.5 FEET WEST OF THE WEST CURB LINE FOR THE SOUTHBOUND LANE OF THE HIGHWAY, 40.3 FEET SOUTH OF THE SOUTHEAST CORNER OF THE OAK KNOLL CANDY SHOP, SET IN TOP OF AN 18-FOOT-LONG BY 10-FOOT-WIDE EXPOSED BEDROCK WHICH IN TURN IS AMONG OTHER HUGE MOUNDS OF ROCK, AND IS ABOUT 3 FEET ABOVE THE LEVEL OF THE HIGHWAY.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (RMS) RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (RMS) RECOVERED IN GOOD CONDITION.

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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