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Details for Benchmark: LW1221

N 41° 59.333 W 071° 30.583 (NAD 83)

Altitude: 291.63

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

Location:
In PROVIDENCE county, RI View Original Datasheet
Designation:
E 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.

Lots of rocks to check out, but none with a clearly defined disk...perhaps it is overgrown with moss or dirt.

RicKNRoy Was Here

Documented History (by the NGS)

01/01/1969 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1969 AT WOONSOCKET. AT WOONSOCKET, ABOUT 1.1 MILES SOUTH ALONG PARK AVENUE FROM THE JUNCTION OF STATE HIGHWAY 122, THENCE 0.25 MILE EAST ALONG CARNATION STREET, THENCE ABOUT 75 YARDS NORTH ALONG KNIGHT STREET, 62 FEET SOUTH OF THE CENTER OF THE JUNCTION OF KNIGHT STREET, BERNARD AVENUE AND BROADWAY, SET IN THE TOP OF A ROCK LEDGE WHICH IS 6 FEET LONG AND 1 1/2 FEET HIGH AND IS AT THE NORTHEAST END OF A LARGE MASS OF ROCKS, 8 FEET SOUTHEAST OF THE SOUTHEAST CURB OF KNIGHT STREET, 1.6 FEET NORTH OF THE WEST CORNER OF A SURFACE BOULDER AND 1 1/2 FEET ABOVE THE LEVEL OF THE STREET.
01/01/1985 by LOCSUR (GOOD)
RECOVERY NOTE BY LOCAL SURVEYOR (INDIVIDUAL OR FIRM) 1985 RECOVERED IN GOOD CONDITION.
01/01/1985 by LOCSUR (GOOD)
RECOVERY NOTE BY LOCAL SURVEYOR (INDIVIDUAL OR FIRM) 1985 RECOVERED IN GOOD CONDITION.
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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