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Details for Benchmark: HV0366

N 38° 55.498 W 077° 06.778 (NAD 83)

Altitude: 3

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

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

Reference Points

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Finally found the station. It is about 6 feet downhill from RM2.

(Original log from 3/13/07 below)
I [b][i]thought[/i][/b] I found the station, but after reviewing BDT notes, it appears that I found the RM2 instead.

RM3 found as described, a large iron bolt and bent into a loop. Witness Mark 1, a shallow drill hole was also noted. Distance and bearing from RM2 to RM3 is 16.5 feet and 290 degrees, (approx).

[This entry was edited by Difficult Run on Thursday, March 15, 2007 at 12:58:55 AM.]

[Photos:]
photoCloseup of RM2.
photoCloseup of Station - Disk Missing
Shank of disk is nearly flush with surface of rock. It's easy to miss.
photoOverview of Station.
Reference Mark 3 circled in yellow. Witness Mark 1 (Drill Hole) circled in green. Reference Mark 2 circled in blue. Station marked by red arrow just left of GPSR. 100 ft. measuring tape in photo also.

This mark was found.

Description change:
The disk is gone, but the shank remains. The azimuth to Reference Mark 2 is incorrect - 344 degrees should be 244 degrees.

Recovery notes:
Reference Mark 1 was not found. Reference Mark 2 disk is gone as per the 1946 report. Its stem is seen in an irregular man-made crater in the rock about 1 inch deep and 3 inches in diameter. Reference Mark 3 is very obvious; a bolt of 2-inch diameter iron bent into a loop. Witness Mark 1 was found - a 1/2-inch shallow drill hole. The mark is best found by measuring from Refernce Mark 2 and Witness Mark 1. It is in a direction toward the river from Reference Mark 2.

[Photos:]
photoAt station CREEK in Arlington County, Virginia
Reference Mark 3, an iron bolt, is indicated by an upward pointing red arrow. Witness Mark 1, a shallow drill hole with a small white rock put on it, is indicated by a right-pointing white arrow. Reference Mark 2, a former site of a disk, is indicated by a downward-pointing yellow arrow. In the top of the picture is the vertical part of the bluff.
photoAt station CREEK in Arlington County, Virginia
Witness Mark 1 is indicated by the left-pointing white arrow. Reference Mark 2 is indicated by the upward-pointing yellow arrow. The approximate position of station CREEK is indicated by the red arrow. (The black and white objects near it are my benchmark hunting pack and datasheet papers.) The view is toward the Potomac River.
photoThe remains of station CREEK in Arlington County,
The disk shank is seen with a small amount of cement near it. It is on smooth, flat, slanted bedrock.
photoRM 2 of station CREEK in Arlington County,
View looking down into the irregular man-made crater to see the shank of RM 2.
photoWM 1 of station CREEK in Arlington County, VA
The 1/2 inch diameter shallow drill hole.
photoRM 3 of station CREEK in Arlington County, VA
Reference Mark 3 of station CREEK, the large iron bolt.

This area is along the Potomac river, in Arlington, Virginia, across from Washington. The station was last reported as recovered in 1957. GPS reading and the description suggests the location seen in the accompanying picture: a mostly-solid rock ledge in front of a high rock wall. The ledge slopes gently, and there is a lot of debris on it: leaves, twigs, etc. I was unable to find evidence of the survey disk, but there were many square yards covered completely with debris, and because of the precarious footing among other reasons, I was not able to clear off all areas down to the rock. No sign of the painted numerals on the rock face as described in 1946 note. Very possibly still there, however.

[Photos:]
photoRock ledge where HV0366 is believed to be, possibly under debris or vegetation, Arlington, VA
There is a sharp fall-off just right of the tree. The white patch in the center, also just right of the tree, is the Potomac River.

Documented History (by the NGS)

01/01/1925 by USE (MONUMENTED)
DESCRIBED BY US ENGINEERS 1925 (GLB) STATION IS SITUATED ABOUT 1/3 MILE SE OF THE CHAIN BRIDGE ON THE VIRGINIA SIDE OF THE POTOMAC RIVER. IT IS ABOUT 100 METERS SE OF A SMALL CREEK WITH AN OLD POWERHOUSE IN A PROMINENT RAVINE. IT IS ON A PROMINENT HIGH LEDGE ABOUT 40 FEET BACK FROM THE RIVER AND 15 FEET ABOVE THE WATER. ABOUT 15 FEET FROM THE BASE OF THE BLUFF. STATION IS MARKED BY A UNITED STATES ENGINEERS MARK SET WITH CEMENT IN A DRILL HOLE IN THE SOLID ROCK. REFERENCE MARK NO. 1 IS A DRILL HOLE IN THE EDGE OF THE LEDGE. REFERENCE MARK NO. 2 IS A REGULAR REFERENCE MARK SET WITH CEMENT IN A DEPRESSION IN THE LEDGE. REFERENCE MARK NO. 3 IS A LARGE IRON BOLT SET IN A DRILL HOLE. WITNESS MARK NO. 1 IS A DRILL HOLE.
01/01/1935 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB) RECOVERED AS DESCRIBED.
01/01/1946 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN) AT SITE OF STATION, 40 IS PAINTED IN LARGE RED FIGURES ON FACE OF CLIFF. REFERENCE MARK 2 IS OUT, LEAVING PLUG OF MARK. OTHERWISE, AS DESCRIBED. DESCRIPTION ADEQUATE.
01/01/1957 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957 (JL) THE STATION WAS FOUND IN GOOD CONDITION AND PREVIOUS DESCRIPTION IS ADEQUATE.

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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