Details for Benchmark: HV1555
N 38° 54.714 W 077° 06.465 (NAD 83)
Coordinates may not be exact. Altitude is SCALED and location is ADJUSTED. (more info)
- In ARLINGTON county, VA View Original Datasheet
- MITCHELL 2 PB AND PP 1931
- Marker Type:
- gravity station disk
- setting not listed - see description
- Mark of questionable or unknown stability.
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||ArtMan found HV1555
I am a little abashed about logging this, since Difficult Run did all the work, and even discretely flagged the site. I ventured out this morning amid a light dusting of snow to add just one small bit of value - an area photo.
The site is actually a few yards north of the area where I had previously looked for this mark, although I believe the coordinates indicated by the green arrow in the Google Maps image may be a bit farther to the north than the actual location.
[Photos:]Closeup, MITCHELL 2 (HV1555), Arlington, VA
Area view, MITCHELL 2 (HV1555), Arlington, VA
Yellow box highlights location of disk. Photo taken from near pipe gate at entrance to driveway to nature center. Visible in the top right of photo is the overhang from the sign at the trailhead.
Annotated map, MITCHELL 2 (HV1555), Arlington, VA
Green arrow indicates location of disk computed by Google Maps. (I think the disk is actually a bit south of the arrow.)
||Difficult Run found HV1555
N 38° 52.715 W 077° 06.462
Found in good condition, as monumented in the 1931 report.
Station is set in a native stone, flush with ground level, and UNSTAMPED. The 1937, 1938 and 1946 recovery reports are in error, as this mark IS NOT set in a terra cotta pipe. The station initially appears set in a concrete mass, but upon further inspection of the closeup photograph, the concrete is simply the mortar holding the disk in place.
Perhaps the later reports were erroneously tied to a nearby reference mark, none of which show up in the "box score".
Special thanks go to Martin Ogle, Chief Naturalist for the Potomac Overlook Regional Park who gave verbal permission for the brief use of a metal detector and witnessed the recovery.
Note the station is set in a native stone, not a concrete mass or terra cotta pipe.
||Difficult Run couldn't find HV1555
The area was recently cleared, however I was unable to locate the mark.
Adding two photos which might be helpful.
~ Mitch ~
[Photos:]Photo of Area
1956 USGS Map
Note the cemetery about 630 feet NNE of the station.
||Black Dog Trackers couldn't find HV1555
This gravity station disk was not found. Its location is in extremely dense undergrowth at this time of year and possibly under some old logs as well.
The location description requires updating as the area is now the Potomac Overlook Regional Park and all the landmarks in the description are gone.
The designation is also ambiguous because of contradictory recovery notes.
[Photos:]Area of unfound HV1555 in Arlington, VA
The adjusted location seems to be about 10 feet past the woodchip area into the wild rose and vine undergrowth which is 5 to 7 feet high.
Documented History (by the NGS)
|01/01/1931 by PBPP (MONUMENTED)
|DESCRIBED BY PUB BLDGS AND PARKS 1931
STATION IS LOCATED ON VIRGINIA SHORE OF POTOMAC RIVER IN ARLINGTON COUNTY ON TOP OF SMALL KNOLL OF GROUND ON PROPERTY OF MR. G.D. MITCHELL ABOUT 1 MILE N OF CHERRYDALE, VIRGINIA.
THE SURFACE MARKER IS A STANDARD P.B. AND P.P. DISK SET IN A NATIVE GRANITE STONE ABOUT 8 INCHES SQUARE AT THE TOP, LARGER AT THE BOTTOM, AND ABOUT 2 FEET LONG.
THE AZIMUTH STATION IS MARKED BY A STANDARD DISK SET IN A BLOCK OF CONCRETE ABOUT 12 INCHES IN DIAMETER.
ENTRANCE TO STATION IS GAINED BY TURNING OFF (EAST) MILITARY ROAD 0.8 MILE ABOVE CHERRYDALE AND PROCEEDING THROUGH SETTLEMENT KNOWN AS MARCYTOWN. THE STATION IS ONE SIDE OF DIRT ROAD ABOUT 100 YARDS PAST HOUSE OF MR. ADDY HORSEMAN.
|01/01/1937 by PBPP (SEE DESCRIPTION)
|RECOVERY NOTE BY PUB BLDGS AND PARKS 1937
STATION IS LOCATED IN A SMALL OPEN SPOT ON TOP OF KNOLL ON PROPERTY OF MR. MITCHELL ABOUT 100 FEET E OF DONALDSON FAMILY BURYING GROUND.
STATION IS STANDARD BRONZE DISK IN 6-INCH TERRA COTTA PIPE, STAMPED MITCHELL NO. 7 SET FLUSH WITH THE GROUND. THE SUBSURFACE MARKER IS ALSO A BRONZE DISK SET IN A PINT MILK BOTTLE FILLED WITH AND SURROUNDED BY CONCRETE.
ENTRANCE TO STATION IS THROUGH SETTLEMENT KNOWN AS MARCEYTOWN, OFF OF MILITARY ROAD ABOUT 1 MILE N OF CHERRYDALE.
NOTE--THIS STATION HAS BEEN RE-NAMED GRAVEYARD.
|01/01/1938 by CGS (GOOD)
|RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
STATION RECOVERED. AZIMUTH MARK NOT SEARCHED FOR.
|01/01/1946 by CGS (GOOD)
|RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
STATION RECOVERED AND FOUND IN GOOD CONDITION. THE FOLLOWING EXCEPTIONS AND ADDITIONS SHOULD BE MADE TO THE DESCRIPTION. STATION IS 77.72 FEET E OF A 14-INCH WILD CHERRY TREE ONE EDGE OF SMALL GRAVEYARD, 14.8 FEET FROM A THREE-PRONGED STOOL OF SMALL WILD CHERRY TREES, AND 45.0 FEET FROM A 12-INCH LOCUST. STATION MARK IS STAMPED MITCHELL NO 1 NOT MITCHELL NO 7. STATION RENAMED GRAVEYARD IN 1931.
- 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.