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Details for Benchmark: JW0186

N 39° 17.667 W 078° 04.783 (NAD 83)

Altitude: 637.23

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

Location:
In FREDERICK county, VA View Original Datasheet
Designation:
A 336
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Benchmark in good condition. Coordinates took us to the wrong side of the road. Below description got us to the benchmark. Our coordinates were: N 39 17.677 W 078 04.791.

[Photos:]
photoJW0186
photoJW0186

Found in good condition

[Photos:]
photoJW0186

Recovered in good condition - mark is about 20 feet WSW of a telephone pole...

[Photos:]
photoA 336 (JW0186) disk - Frederick County, VA
photoA 336 (JW0186) setting - Frederick County, VA
photoA 336 (JW0186) area - view looking S

I'm fairly sure this benchmark is technically in West Virginia, if only by a few feet. It is on the opposite side of the driveway from the Winchester Auto Dealers Exchange sign and fairly easy to see. Notice the square concrete posts in the background along the road, I think this is the boarder, with West Virginia to the left, and Virginia to the right.

[Photos:]
photoA 336 - The Mark
photoThe Rock
The mark in the rock setting.
photoArea Shot
Mark in the forground rock, notice the leaning concrete post I believe marking the state line.

This BM is in front of Winchester Auto Dealers Exchange just south of a big lilac bush.

Documented History (by the NGS)

01/01/1957 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1957 2.7 MI N FROM CLEARBROOK. FROM THE POST OFFICE AT CLEARBROOK, GO NORTH ON U.S. HIGHWAY 11 FOR 2.7 MILES THE STATE LINE AND MARK ON LEFT. THE MARK IS 48 FEET WEST NORTHWEST OF THE CENTERLINE OF U.S. 11, 29.6 FEET WEST NORTHWEST OF THE STATE LINE MARKER POST, AND 7.5 FEET SOUTH SOUTHEAST OF A FIVE FOOT HIGH METAL POST WITH BRACE. SET IN A ROCK OUTCROP LEVEL WITH THE GROUND.
01/01/1978 by ALSTER (GOOD)
RECOVERY NOTE BY ALSTER AND ASSOCIATES ENGINEERS 1978 RECOVERED IN GOOD CONDITION.
02/28/1998 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1998 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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