Details for Benchmark: HV4826
N 38° 57.104 W 077° 08.802 (NAD 83)
Coordinates may not be exact. Altitude is SCALED and location is ADJUSTED. (more info)
- In FAIRFAX county, VA View Original Datasheet
- LOOMIS PB AND PP 1930
- Marker Type:
- NGS Benchmark
- setting not listed - see description
- Mark of questionable or unknown stability.
Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.
||ArtMan posted a note for HV4826
Topozone places this right in the middle of the CIA campus. If it wasn't destroyed during construction at some point, it might as well have been, considering the likelihood that any of us will be able to get access to it.
||skintigh marked HV4826 as destroyed
Via www.ngs.noaa.gov destroyed marks database:
HV4826 HISTORY - 19840101 DESTROYED NGS
HV4826 STATION RECOVERY (1984)
HV4826'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984 (CLN)
HV4826'STATION BOWEN WAS ESTABLISHED TO REPLACE THIS STATION. THIS STATION
HV4826'WAS DESTROYED UPON COMPLETION OF POSITIONING OF STATION BOWEN.
Edit: paperwork for mark destruction filed 6/26/1984
This entry was edited by skintigh on Friday, 09 January 2015 at 20:48:46 UTC.
Documented History (by the NGS)
|01/01/1930 by PBPP (MONUMENTED)
|DESCRIBED BY PUB BLDGS AND PARKS 1930
STATION IS ON THE N (RIVER) SIDE OF THE CHAIN BRIDGE-LANGLEY ROAD. IT IS SITUATED ON THE FARM OF AND DIRECTLY BEHIND THE HOUSE OF M.J. LIGHTBOWN, AND IS ABOUT 0.6 MILE FROM THE ROAD ABOVE. IT IS ON A LARGE KNOLL JUST TO THE E OF A KNOLL OCCUPIED BY THE HOUSE OF D.C. LOOMIS. THE HOUSE OF M.J. LIGHTBOWN IS THE FIRST HOUSE ON THE N SIDE OF THE CHAIN BRIDGE-LANGLEY ROAD AFTER PASSING THE PRIVATE ROAD TO THE ESTATE OF JOSEPH LEITER.
STATION CONSISTS OF A STANDARD U.S.P.N. AND P.P. MARKER SET IN CONCRETE IN A 5-INCH IRON PIPE. UNDERGROUND MARK IS A SOFT DRINK BOTTLE WITH TOP ABOUT 3 FEET 10 INCHES BELOW SURFACE OF GROUND.
ENTRANCE TO THE STATION IS OBTAINED BY DRIVING IN LIGHTBOWNS ENTRANCE AND AROUND HIS BARN, FROM WHICH A STRAIGHT ROAD LEADS BACK TO THE LOOMIS HOME AND THE KNOLL ON WHICH STATION IS LOCATED.
|01/01/1956 by CGS (GOOD)
|RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956 (MLC)
THE STATION WAS RECOVERED AND FOUND TO BE IN GOOD CONDITION. THE MARK WAS FOUND FLUSH WITH THE GROUND, ABOUT 15 FT. N OF THE HIGH POINT AT THE S END OF THE KNOLL. IT IS 4 FT. NW OF A 4-IN. CEDAR TREE, 52 FT. W OF A 36-IN. OAK TREE (MAG. BEARING 265 DEG) ON THE E SIDE OF THE KNOLL, AND ABOUT 135 PACES E (MAG. BEARING 70 DEG) FROM A WHITE COLONIAL-TYPE HOUSE.
TO REACH THE STATION FROM THE JUNCTION OF STATE HIGHWAYS 193 AND 123 NEAR LANGLEY, GO E ON STATE HIGHWAY 123 FOR 0.4 MI. TO A PAVED ROAD AT THE ENTRANCE TO THE BUREAU OF PUBLIC ROADS, CONTINUE AHEAD ON STATE HIGHWAY 123 FOR 100 YD. TO A GATE IN A WHITE FENCE AND A GRAVEL ROAD N AT SIGN NAT GUARD AA BTRY ACROSS THE ROAD FROM A TWO-STORY BRICK HOUSE, TURN LEFT AND GO N FOR 0.4 MI. TO THE WHITE HOUSE MENTIONED ABOVE.
- The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in November 1994.
- The orthometric height was scaled from a topographic map.
- The Laplace correction was computed from DEFLEC99 derived deflections.
- The geoid height was determined by GEOID99.