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Details for Benchmark: NB0774

N 42° 54.683 W 077° 25.050 (NAD 83)

Altitude: 847.79

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

Location:
In ONTARIO county, NY View Original Datasheet
Designation:
L 146
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Pretty easy to find. Though the description is very accurate, it should be noted to remember to check both sides of the road. We were searching with no GPS unit and working from memory and notes we took before heading out and wasted a minute looking at the wrong side by accident.

This entry was edited by Adventure-tron on Saturday, 26 May 2012 at 00:04:53 UTC.

[Photos:]
photoClose-Up

Easy Find. Just as discribed.

[Photos:]
photoNB0774

Right where it should be, easy to find.

[Photos:]
photoCloseup of disk

Documented History (by the NGS)

01/01/1942 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1942 0.7 MI N FROM HOLCOMB. TO REACH FROM THE NEW YORK CENTRAL RAILROAD STATION AT HOLCOMB, PROCEED NORTH ON PAVED ROAD AND GO 0.7 MILE TO A LARGE CONCRETE CULVERT AND SITE OF BENCH MARK. BENCH MARK IS SET HORIZONTALLY ON TOP OF THE SOUTH END OF THE WEST HEADWALL OF THE CONCRETE CULVERT, 24 FEET WEST OF AND ABOUT THE SAME ELEVATION AS THE CENTER LINE OF THE ROAD.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (JMR) RECOVERED IN GOOD CONDITION.
10/24/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (RHS) 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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