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Details for Benchmark: NB0775

N 42° 55.433 W 077° 24.950 (NAD 83)

Altitude: 980.57

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

Location:
In ONTARIO county, NY View Original Datasheet
Designation:
M 146
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Another easy find.

[Photos:]
photoNB0775 or AKA: M146
photoYES it is an M

This is one of few surviving benchmarks on route 444. Most of them were destroyed when the road was improved many years ago. Someone has tried to protect this one by placing four large stones around it, probably a good idea, since it's more or less in the middle of a tractor path.

Improved description: 26 feet west from the center of route 444, 116.5' north of power pole #58. Handheld coordinates are 42.92391N 77.41596W.

[Photos:]
photoCloseup of disk
photoView from the road

Documented History (by the NGS)

01/01/1942 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1942 1.6 MI N FROM HOLCOMB. TO REACH FROM THE NEW YORK CENTRAL RAILROAD STATION AT HOLCOMB, PROCEED NORTH ON PAVED ROAD AND GO 1.6 MILES TO TOP OF A SMALL HILL AND SITE OF BENCH MARK. BENCH MARK IS DIRECTLY ACROSS THE ROAD FROM THE INTERSECTION OF A PRIVATE DRIVEWAY, 30 FEET WEST OF AND ABOUT THE SAME ELEVATION AS THE CENTER LINE OF THE ROAD, 25 FEET SOUTH OF THE SOUTH END OF A LARGE PILE OF ROCKS, 18 FEET SOUTH OF A FENCE CORNER, 3 FEET NORTH OF A 4 BY 4 INCH WOODEN MARKER POST AND ONE FOOT EAST OF THE RIGHT OF WAY FENCE, MONUMENT PROJECTS 0.5 FEET.
01/01/1971 by USGS (MARK NOT FOUND)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1971 MARK NOT FOUND.
05/11/1997 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1997 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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