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Details for Benchmark: HV4630

N 38° 47.433 W 077° 02.374 (NAD 83)

Altitude: 7

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

Location:
In C OF ALEXANDRIA county, VA View Original Datasheet
Designation:
750
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

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Not going to last here much longer with the erosion to the shore line

[Photos:]
photoIMAG1098

mark found as described

Not sure how much longer this will last.

[Photos:]
photoHV4630

Found without issue.

[Photos:]
photoHV4630
photoHV4630_view

We had to refer to the logs to make sure this was actually the benchmark since the cap is missing. The stone was covered with a thick layer of dirt which we cleared off to see the marks on the stone.

[Photos:]
photoHv4630

Found with little trouble. Nice view of the Potomac River and the new Wilson bridge too.

Found this one easily. My coordinates were N 38*47.434 by W 077*02.374.

Still there; no reportable change to its condition.

No change since previous log entries, just more progress made to the bridge.

Jeff & Alissa

Found this one easily. The clue here will help you find HV4591. Canuman, Greer, SC.

This mark was found in very poor condition. The letters USED are readable on the 15-inch diameter base. The iron pipe cap marked 750 is gone but the iron pipe itself remains, cut off at the level of the 15-inch diameter concrete base. The tower (HV4638) is gone, but its 4 corner posts remain.

[Photos:]
photoAt HV4630 in Alexandria, Virginia
The mark is in the center of a 15-inch diameter concrete base. The yellow arrow points to the upper-right edge of the base. The view is Northeast across the Potomac River. The mark was directly below the center of the navigation light tower HV4638. One of the tower's concrete bases is in the foreground, and another is opposite the 15-inch concrete base.
photoAt HV4630 in Alexandria, Virginia - eye level
The eye-level view of HV4630. The letters SED are clearly visible surrounding the remains of the iron pipe.
photoAt HV4630 in Alexandria, Virginia
Closeup of the remains of the iron pipe.

Documented History (by the NGS)

01/01/1957 by USE (MONUMENTED)
DESCRIBED BY US ENGINEERS 1957 (FAR) STATION IS APPROXIMATELY 2 MILES SOUTHEAST OF THE GEORGE WASHINGTON MASONIC MEMORIAL IN ALEXANDRIA, AT THE EXTREME END OF JONES POINT, ON PROPERTY OF THE U.S. NAVAL RESERVE TRAINING CENTER AND IN THE APPROXIMATE CENTER OF THE JONES POINT LIGHT TOWER. THE LIGHT ON THIS TOWER IS TRIANGULATION STATION JONES 1928. A TRAVERSE CONNECTION WAS MADE TO TRIANGULATION STATION JONES 2, DISTANCE BEING 49.99 FEET (15.237 METERS) EAST-NORTHEAST OF STATION JONES 2. THE MARK, A U.S. ENGINEERS DEPARTMENT STATION MARK, STAMPED 750, IS A IRON CAP SET IN CONCRETE 15 INCHES IN DIAMETER WHICH IS FLUSH WITH THE SURFACE OF THE GROUND.
09/13/1996 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1996 MARK NOT FOUND.

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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