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Details for Benchmark: HV3559

N 38° 55.275 W 077° 06.501 (NAD 83)

Altitude: 7

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

Location:
In ARLINGTON county, VA View Original Datasheet
Designation:
BIG
Marker Type:
survey disk
Setting:
in rock outcrop
Stability:

Reference Points

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Station found per description by BDT.
VA - DC Boundary Mark and corresponding Reference Mark found also.

[Photos:]
photoCloseup of Station - Disk Missing.
Cross cut in exposed shank.
photoDC - VA Boundary Witness Mark #2 - 1946.
Closeup of Disk.
photoCloseup of Reference Mark for Boundary Monument.
This disk is about 15 feet from the DC - VA Boundary Witness Mark on a small ledge about 6 feet above the station level. Marked D.C. No 2 - 1946.
photoLocation of Nearby Reference Mark.
As viewed from the trail. Mark is about 15 feet inland from DC - VA Boundary Witness Mark No 2.

This mark was found as described in the 1946 (RCB) description except that the mark is located on a ledge of bedrock, not a boulder.

The mark is mostly surrounded with the cement mounting for the original disk. It is located about 15 feet west of an almost vertical dropoff of about 15 feet to deep water. The distance from DC VA Witness Mark 2 is 12.51 feet as per the 1946 description, not 3.791 feet as per the 1947 description.

[Photos:]
photoAt station BIG in Arlington, Virginia
The yellow arrow points to the shank marked with a cross as described. Behind the mark is a dropoff to the Potomac River.
photoStation BIG in Arlington, Virginia
The disk shank marked with a cross as described.
photoAt DC Witness Mark 2 near station BIG
The location of the witness mark is between the two yellow arrows. The background is the Potomac River, looking upstream
photoDC Witness Mark 2 near station BIG
The disk 12.51 feet West of station BIG in Arlington, Virginia.

Documented History (by the NGS)

01/01/1925 by USE (MONUMENTED)
DESCRIBED BY US ENGINEERS 1925 (GLB) STATION IS SITUATED ON A PROMINENT ROCKY POINT, ABOUT 3/4 MILE SE OF CHAIN BRIDGE ON THE VIRGINIA SIDE OF THE POTOMAC RIVER. IT IS THE LAST PROMINENT POINT FROM WHICH THE W END OF CHAIN BRIDGE IS VISIBLE. SIX FEET FROM THE WATERS EDGE AND ABOUT 15 FEET ABOVE IT. THE TRAIL IS A FEW FEET INSHORE AND ABOUT 10 FEET ABOVE. MARKED BY A UNITED STATES ENGINEERS MARK SET WITH CEMENT IN A DRILL HOLE IN THE SOLID LEDGE. REFERENCE MARK NO. 1 IS A REGULAR REFERENCE MARK SET IN CEMENT IN A DEPRESSION IN THE SOLID LEDGE AND CLOSE TO TRAIL. WITNESS MARK NO. 1 IS AN ASH TREE ABOUT 1 FOOT IN DIAMETER AT THE SIDE OF THE TRAIL.
01/01/1935 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB) RECOVERED AS DESCRIBED EXCEPT THAT THE U.S.E. DISK HAS BEEN BROKEN OFF AND THE STATION IS NOW MARKED BY A COPPER PLUG, POSSIBLY THE SHANK OF THE STATION TABLET, ON THE TOP OF WHICH A CROSS (+) HAS BEEN CUT. NO REFERENCE MARKS WERE RECOVERED. THE FIGURES 37 ARE PAINTED ON A ROCK NEARBY.
01/01/1946 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN) REFERENCE MARK 1 NOT FOUND. WITNESS MARK 1 IS OUT. OTHERWISE, RECOVERY MADE AS DESCRIBED.
01/01/1946 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB) STATION WAS RECOVERED IN GOOD CONDITION EXCEPT THE DISK HAS BEEN BROKEN OFF THE SHANK AND A CROSS HAS BEEN CUT IN SHANK TO LOCATE THE STATION. REFERENCE MARKS WERE NOT SEARCHED FOR. A COMPLETE NEW DESCRIPTION FOLLOWS--THE STATION IS LOCATED ON THE VIRGINIA SIDE OF THE POTOMAC, ABOUT 300 YARDS N OF A SMALL STREAM WHICH IS 1/2 MILE S OF THE CHAIN BRIDGE. IT IS 12.51 FEET E OF D.C.-VA. BOUNDARY MARK NO. 2. THE MARK IS A CROSS CUT IN THE SHANK OF A DISK IN A DRILL HOLE IN A BOULDER NEAR THE WATERS EDGE.
01/01/1947 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (EAD) THE STATION WAS FOUND AS DESCRIBED. THE REFERENCE MARKS AND WITNESS MARKS IN THE 1925 AND 1935 DESCRIPTIONS WERE SEARCHED FOR BUT NOT FOUND. THE DESCRIPTION IN THE 1946 RECOVERY NOTE IS ADEQUATE. D.C.-VA. BOUNDARY MARK NO. 2 HAS BEEN RESTAMPED D.C.-VA. BOUNDARY WITNESS MARK NO. 2.
01/01/1947 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (RMB) STATION RECOVERED AS DESCRIBED. NONE OF THE ORIGINAL REFERENCE MARKS WERE FOUND. IT IS LOCATED ABOUT 500 FEET NE OF A SMALL CREEK KNOWN AS DONALDSON RUN. A NEW STATION MARKED BY A STANDARD TRAVERSE DISK AND STAMPED DC VA BOUNDARY WITNESS MARK NO 2 IS 3.791 FEET W OF THE STATION. NOTE--THE RECOVERY NOTE BY E.A.D., 1947 SHOULD BE DISREGARDED AS IT IS APPARENT THAT THIS PARTY RECOVERED THE WRONG STATION.

Control Text

  • 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.

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