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Details for Benchmark: HV1700

N 38° 53.917 W 077° 04.000 (NAD 83)

Altitude: 2.8

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

Location:
In ARLINGTON county, VA View Original Datasheet
Designation:
326 PBPP
Marker Type:
survey disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Note: this benchmark is "SET IN TOP OF LARGE ROCK OUTCROP WHICH IS ON THE RIVER EDGE."
The photos of a benchmark set in concrete in the woods are of some other marker.

On my way to an earth cache I nearly stumbled upon this one.
Good condition.

[Photos:]
photo
N 38° 53.917 W 077° 04.000

First outing with the family we found it just as described on Roosevelt Island.

[Photos:]
photoFound it
Found our first one
photoRest of us
Jack and Caroline find their first benchmark.

accidental find walking along with trail fun

[Photos:]
photo1407075733828
photo1407075733828

Found a nearby geocache and then came looking for this. I couldn't get closer without getting wet. But that is definately it!

[Photos:]
photoHV1700
N 38° 53.918 W 077° 03.989

Found as described. Upon reaching Roosevelt Island by way of the foot bridge, turn hard left (NNW) and follow the path closest to the Little River. The mark is set in the top of a boulder in the first multi-boulder outcrop north of the footbridge, and about four feet off-shore.

[Photos:]
photoHV1700 - the Mark
photoHV1700 on Roosevelt Island, Washington, DC
Looking west at the rock outcropping from the shore. Mark is in the top of the farthest rock, center.

Yippie, Yahoo I found it.
Crew member in area running around.
Nice area
Found as described,
Easy find thanks to photos & description from previous finder
ELECTRIC SHAVERS

OK, I have to admit, I'm proud I found this one. The description is pretty vague, and the coordinates were scaled from a map with just 6 second accuracy, so it was a bit of a hunting expedition, but it was a gorgeous afternoon and maybe, after some morning benchmarking failures, my luck would improve.

The island once named Analostan is now Theodore Roosevelt Island, and in addition to nature trails and such, it has an impressive memorial to the Rough Rider.

The benchmark disk is not stamped with the station number. It just has the standard wording Public Buildings & Public Parks / Write the Director for Information / Bench Mark / $250 Fine for Disturbing. I'm not an expert, but I'd say the metal is bronze. My GPS gave coordinates around 38°53'54.8-55.0 and 077°03'49.2-59.9

My directions: after crossing the pedestrian bridge, turn left and walk nearly to the end of the island to an information sign on the left about the causeway. Backtrack about 60 paces, and the station is atop a good size boulder at the water's edge.

[Photos:]
photoCloseup of HV1700, Washington, DC
photoStation disk, bottom center, and Potomac River, looking upstream, with Key Bridge and Georgetown University in distance

Documented History (by the NGS)

01/01/1932 by PBPP (MONUMENTED)
01/01/1935 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1935 AT ANALOSTAN ISLAND. SET IN TOP OF LARGE ROCK OUTCROP WHICH IS ON THE RIVER EDGE AND WE SIDE OF ANALOSTAN ISLAND, APPROX. 300 FT SOUTH FROM THE NORTHWEST POINT OF THE ISLAND, 130 FT SOUTH FROM THE RUINS OF OLD CAUSEWAY RUNNING EAST AND WEST BETWEEN THE ISLAND AND ROSSLYN, VA.
01/01/1946 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The geoid height was determined by GEOID99.

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