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Details for Benchmark: JV2893

N 39° 08.983 W 077° 14.583 (NAD 83)

Altitude: 461.46

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

Location:
In MONTGOMERY county, MD View Original Datasheet
Designation:
3230 WSSC
Marker Type:
bolt
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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08:21 I had to displace couple inches of dirt, three worms and an angry millipede, but the witness post made it pretty easy to find.

Found It :) Although what I found does not look like the pictures cplcache took. I,ll upload mine too.
mrfixitman

[Photos:]
photoWSSC - 3230

BMWkids took me to my first benchmark. It was under lots of leaves but we found it. Very interesting.

[Photos:]
photoThe Benchmark

Found this while working with CplCache, her first benchmark. We had to remove alot of leaves to find it on the 3rd step from bottom on the righthand side. I will add pictures shortly.

N 39° 08.984 W 077° 14.568

Found as described in mostly-unuesed concrete steps in front of white-painted wooden St. Rose of Lima Roman Catholic church. Bolt is surrounded by a washer/collar stamped W.S.S.C. B.M. No. 3230

[Photos:]
photoCloseup WSSC 3230 (JV2893), Montgomery Co, MD
photoArea view with church, JV2893, Montgomery Co, MD
Arrow indicates location of station bolt on barely-visible concrete steps at left.

Documented History (by the NGS)

Unknown by WSSC (MONUMENTED)
01/01/1966 by WSSC (GOOD)
DESCRIBED BY WASH SUBURB SAN COMM 1966 0.5 MI S FROM DARNESTOWN. 2.5 MI. N.E. ALONG STATE HWY. 28 FROM ITS JUNCTION WITH STATE HWY. 112 AT DARNESTOWN, THENCE 0.75 MI. N.E. ALONG STATE HWY. 124, THENCE 1.5 MI. N. ALONG LONGDRAUGH ROAD, THENCE 0.3 MI. W. ALONG CLOPPER ROAD. IN THE THIRD CONCRETE STEP LEADING TO A WHITE FRAME CHURCH ABOUT 250 FT. E. OF A GAME PRESERVE ROAD. BENCH MARK MAY ALSO BE REACHED BY GOING 1.2 MI. ALONG STATE HWY. 124 FROM ITS INTERSECTION WITH STATE HWY. 355 AT GAITHERSBURG THENCE 1.3 MI. W. ALONG CLOPPER ROAD.

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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