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Details for Benchmark: HV4500

N 38° 53.550 W 077° 00.744 (NAD 83)

Altitude: 15.8

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

Location:
In DISTRICT OF COLUMBIA county, DC View Original Datasheet
Designation:
1 LA
Marker Type:
survey disk
Setting:
setting not listed - see description
Stability:

Reference Points

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found while walking around DC

Eine interessante Variante von Geocaching, die ich so bisher noch nicht kannte. Und wenn man schon mal über den großen Teich gereist ist, muss man dies natürlich auch mal testen! Der Benchmark befindet sich wie angegeben in gutem Zustand am bekannten Ort!! Vielen Dank fürs Zeigen!!

[Photos:]
photoHV4500

Found it with my dad (Dukemartin) and my mom.

Found in good condition at N38 53 547 W077 00.746 with 19' accuracy.

[Photos:]
photoLocation
photoCloseup

Found it

After the Ikebana exhibit this morning at the National Arboretum, we spent the afternoon geocaching and benchmarking around the National Mall. Recovered this one in good shape. PADC disc at First St. and Louisiana Ave.

[Photos:]
photoPADC mark
photoMark in foreground sidewalk

Recovered in good condition in a triangle bounded by Louisiana Ave NW, First Street NW and Constitution Ave NW.
Did not look for the 2 reference objects due to lack of time.

[Photos:]
photoHV4500 - Disk – Washington D.C.
photoHV4500 - Eye level view.
Looking north-northeast. Mark is in the yellow circle.
photoHV4500 with Capitol in background.
Looking southeast. Arrow points to the location of the mark.

Last year we looked for several of these and did not find a single one. This time, we were luckier! Found on a great day to walk the National Mall in DC.

Walked a few today in this order.

HV4165
HV1827
HV4500
HV2188
HV1973

[Photos:]
photoRub of Benchmark
Nothing but a green pencil and some paper.

Found in good condition. Took two tries; serves me right for hunting in the dark...

[Photos:]
photoHV4500 mark
HV4500 mark with GPS
photoHV4500 area SE
Looking SE near HV4500. Mark is lower right just to the left of the bullet-shaped thermos; Capitol is in the center-left background.

Found as described. Cute.

Grabbed this one on the way to the capitol. Interesting BM.

During the first pass, there was a policeman guarding the benchmark. Came an our later, and took a picture.

This benchmark is still here in good condition. It doesn't look like other benchmarks that I am used to. I spent some time looking around to make sure this was te correct disc. If I would have read the comments it would have been easier, but hey that is part of the fun right?

[Photos:]
photosurvey disc.jpg
N 38° 53.554 W 077° 00.741

Bench Mark 1 LA was recovered as described, in good condition.

[Photos:]
photoBench Mark 1 LA w/GPSr
photoBench Mark 1 LA
photoNorth at Bench Mark 1 LA
photoEast at Bench Mark 1 LA

Mark was found on location in good condition.

[Photos:]
photoMark

This unusual survey disc near the Capitol includes the letters PADC, for Pennsylvania Avenue Development Corporation, the entity which oversaw redevelopment of America's Main Street, mainly in the 1970s and '80. (I'm not sure if it still exists or not.) The blocks between the White House and the Capitol have been transformed during the couple of decades or so that I've been in Washington. The Federal Triangle buildings, classical structures all of a piece erected on the south side of the street in the 1930s, are now complemented across the way by the good (the very, very good Canadian embassy), the bad (the very, very bad J. Edgar Hoover FBI Building - how apt!) and the ugly (did I mention the FBI Building?). And it's still a work in progress; the Freedom Forum and its Newseum, which had been located across the river in Arlington, Virginia, and which calls itself the world's first interactive museum of news, is building a new home here. The street down which the inaugural parade marches every four years is a hell of a lot better looking now, even if the then-stylish PADC logo hasn't weathered quite so well.

[Photos:]
photoCloseup of HV4500, Washington, DC
photoView of disc (arrow) looking NE toward Louisiana Ave. & 1st St., NW

Documented History (by the NGS)

01/01/1981 by CANDA (MONUMENTED)
DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC) THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER C IN A 3-1/2 INCH DIAMETER BRASS DISK. STATION IS LOCATED IN THE CONCRETE SIDEWALK ON THE SOUTHWEST CORNER OF FIRST STREET N.W. AND LOUISIANA AVE. N.W. STATION IS 35.39 FT. WNW OF X ON NORTH RIM OF PEPCO M.H. IN SIDEWALK ON FIRST STREET N.W. STATION IS 36.81 FT. W OF SIGNAL POST BASE. STATION IS 14.33 FT. E OF NAIL AND WASHER IN 12 INCH OAK.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in November 1994.
  • 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 Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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