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Details for Benchmark: HV8076

N 38° 53.333 W 077° 02.100 (NAD 83)

Altitude: 40.98

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

Location:
In DISTRICT OF COLUMBIA county, DC View Original Datasheet
Designation:
A 8
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Most reliable and expected to hold position/elevation well.

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In DC for a conference and mapped out an ambitious agenda for finding virtual, earth, multis, puzzles and regular caches, as well as some bench marks!
Walked all around the monument!
TFTC< ponil

found while touring the area doing the DC virtuals.

Walking around the monument, I spotted this one. Thanks for showing. :)

[Photos:]
photo13

Amazing how many benchmarks are in this area. I would have overlooked this one if I had not done some homework before visiting.

[Photos:]
photoHV8076

Found with shell1fish.

N 38° 53.372 W 077° 02.110

Found as described on the north face of the Washington Monument thanks to previous logs and photos. The stainless steel pipe capped by a plug is certainly a unique benchmark. It seems to be in excellent condition.

[Photos:]
photoClose-up of A 8 - HV8076 Benchmark
photoLocation of A 8 - HV8076 Benchmark Facing West

Recovered in good condition.

[Photos:]
photo20141129_211302

Found while walking the mall with friends from the UK.

[Photos:]
photoNE Side

Recovered as described. Another unusual type of mark.

[Photos:]
photoThe site of the mark
photoThe mark in the monument

Logging some benchmarks after a long time on my list. Sorry for the late logging.

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

Found in good condtion on the North face of the Washington Monument at N38 53.372 W077 02.110 with 21' accuracy.

[Photos:]
photoLocation
photoCloseup

other folks pictures helped with this one :)

Found it thanks to the research of others.

Found this benchmark whilst doing a rapid tourist trip around Washington. Nice easy find..photo to come.

[Photos:]
photoHV8076 close up

A walk around Washington Monument to find all the BMs.

[Photos:]
photoHV8076

Found this one today while walking around - sharing the monument area with thousands of my best friend here looking at the cherry blossoms!

[Photos:]
photoBenchmark HV8076
photoHV8076 general location - looking east

In DC for the week to attend a Geographic Conference, got out of class early so I decided to head to the mall for a few markers.
Got there at 4:30, National Christmas Tree lighting at 5:00 PM so I could not get a few I wanted.

[Photos:]
photoHV8076

saw this one as I walked around the monument. Thanks for the Iphone I can at least look for these dang things while away from my computer.

Found while in D.C. with the family geocaching and vacationing!

Found this one while in the area.

[Photos:]
photoHV8076

found while caching and on vacation

Quite unique little mark.

Iv'e never seen one like this before

[Photos:]
photoP5010013

Found as described, in good condition.

[Photos:]
photoHV8076 mark: A 8 Washington DC
Mark and a truly handheld GPSr
photoHV8076 area W: A 8 Washington DC
View to the W, mark at lower left on wall above notebook. Lincoln Memorial in background. Note the flags flying straight out - this photo was taken just before a gust of wind about 40 mph blew the note book about 50 feet to the E...

Recovered in good condition..

[Photos:]
photoA 8 (HV8076) plug - Washington, DC
photoA 8 (HV8076) area - looking ESE

Found on a beautiful day in DC

Found on a virtual / benchmark run in the mall.

:}

Went back today and found this one. I missed it during my first visit.

[Photos:]
photoHV8076 Wall Marker

We found this one while at the Washington Monument.

[Photos:]
photoHV8076

Spotted this one today after ascending and descending the monument.

Grabbed this one along with the corner markers for the monument.

Found the wall marker while visiting the monument.

[Photos:]
photoWall Marker - HV8076

Got it.

Visiting WM

An easy to find Benchmark at the Washington Monument

[Photos:]
photoHV8076

Easy to find. Camera still malfunctioning, so no picture.

Unable to search for this one due to security fencing at the Washington Monument.

The Washington Monument is surrounded by security/construction fence for some distance on all sides. Approach is limited to ticket holders on the tour. Unable to search for this mark.

Found with Charlie.

Along with the Base Marks.

[Photos:]
photoA8 and Peace Medal
Keeping the Medal moving.

Found this quickly with the desc and help from seventhings' photo. Might not have considered this as being the mark for a while otherwise.

Found as described.

[Photos:]
photoHV8076 - the Mark

I'll have to be satisfied with this exterior recovery. I don't think the park rangers would have been too pleased to see me unscrewing the cap as described in the 1992 recovery note.

[last edit: 8/1/2003 6:13:28 PM PST]

[Photos:]
photoCloseup of A8, Washington Monument, DC

Found this benchmark while visiting the Washington Monument while in DC on a business trip.

Found this while visiting with a class trip.

[Photos:]
photoA 8 in the base of the Washington Monument

Documented History (by the NGS)

01/01/1984 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1984 IN WASHINGTON DC. THE MARK IS 0.2 M ABOVE THE GROUND. AT THE WASHINGTON MONUMENT, SET IN THE WALL OF THE MONUMENT 0.9 METER (3.0 FT) WEST OF THE NORTHEAST CORNER AND 0.2 METER (0.6 FT) ABOVE THE GROUND. THE MARK CONSIST OF A 1-INCH DIAMETER BY 3.5 INCHES LONG STAINLESS STEEL PIPE SET IN THE WALL, AND A STAINLESS STEEL SCREW PLUG, SCREWED INTO THE PIPE AND FLUSH WITH THE WALL. THE POINT FOR WHICH THE ELEVATION IS GIVEN IS EQUIDISTANCE FROM THE TOP OF THE PIPE AND THE TOP OF THE PLUG. (A HORIZONTAL LINE BETWEEN THE TOPS OF THE TWO VISIBLE CIRCLES.) FOR PRECISE LEVELING SURVEYS, THE PLUG IS UNSCREWED AND A SPECIAL STAINLESS STEEL BOLT IS INSERTED IN THE PIPE FOR THE REFERENCE POINT.
05/12/1992 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992 IN WASHINGTON, D.C., A 1-INCH STAINLESS STEEL PLUG SCREWED INTO A 1-INCH DIAMETER BY 3.5-INCHES LONG STAINLESS STEEL PIPE SET VERTICALLY NEAR THE NORTHEAST CORNER OF THE WASHINGTON MONUMENT, 0.9 M (3.0 FT) WEST OF THE NORTHEAST CORNER OF THE MONUMENT, AND 0.2 M (0.7 FT) ABOVE THE GROUND SURFACE. NOTE--FOR PRECISE LEVELING SURVEYS, THE PLUG IS REMOVED AND A SPECIAL STAINLESS STEEL BOLT IS INSERTED INTO THE PIPE FOR THE DATUM POINT.
06/15/1992 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992 IN WASHINGTON, D.C., SET IN THE WALL OF THE WASHINGTON MONUMENT, 0.9 M (3.0 FT) WEST OF THE NORTHEAST CORNER OF THE MONUMENT, AND 0.2 M (0.7 FT) ABOVE THE GROUND SURFACE. THE MARK CONSISTS OF A 1-INCH DIAMETER BY 3.5-INCH LONG STAINLESS STEEL PIPE SET IN THE WALL, A STAINLESS STEEL PLUG SCREWED INTO THE PIPE THAT IS FLUSH WITH THE WALL. THE POINT FOR WHICH THE ELEVATION IS GIVEN IS EQUIDISTANT FROM THE TOP OF THE PIPE AND THE TOP OF THE PLUG (A HORIZONTAL LINE BETWEEN THE TOPS OF THE TWO VISIBLE CIRCLES.) NOTE--FOR PRECISE LEVELING SURVEYS, THE PLUG IS UNSCREWED AND A SPECIAL STAINLESS STEEL BOLT IS INSERTED IN THE PIPE FOR THE REFERENCE POINT.
09/28/1998 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA) RECOVERED AS DESCRIBED.
11/22/1999 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1999 (RWA) RECOVERED AS DESCRIBED.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in April 2000.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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