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Details for Benchmark: HV9832

N 38° 55.026 W 077° 01.906 (NAD 83)

Altitude: 101

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:
FOX GPS E809
Marker Type:
survey disk
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

Reference Points

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Mark found as described. Needed a walk at lunch and I got it.

Found at Event

Found in good condition

[Photos:]
photoHV9832

Benchmark is still there in good condition. Corner is now home to a Subway.

Found as described at 14th and U. The description doesn't give many hints as to its location at this corner, save that it is in the northeast quadrant. But the disk is prominent and easy to find, about halfway between the corner of the building and the corner of the curb. The building at this corner, as can be seen in the second photo, is vacant, and this neighborhood spent decades recovering from the riots that devastated the 14th Street corridor in 1968, but U street has become quite trendy in recent years, and the area is awash with restaurants and clubs and other development. (I lived for many years two blocks away, at 16th and U, but sold my apartment just before it would have surged in value. So it goes.)

[Photos:]
photoCloseup of Fox GPS E809, Washington, DC
photoNorthwest corner of 14th and U, NW, Washington, DC

Documented History (by the NGS)

01/01/1992 by DEWDAV (MONUMENTED)
DESCRIBED BY DEWBERRY DAVIS 1992 STATION IS LOCATED IN DOWNTOWN WASHINGTON, DISTRICT OF COLUMBIA. TO REACH STATION PROCEED TO INTERSECTION OF 14TH STREET NORTHWEST AND U STREET NORTHWEST. STATION IS STANDARD 2.5 INCH DIAMETER BRASS METRO DISK SET IN SIDEWALK IN NORTHEAST QUADRANT OF SAID INTERSECTION. STATION IS 343.622 FT (104.736 M) SOUTH 00-13-12 EAST OF METRO CONTROL POINT E903 ON 14TH STREET, 122.015 FT (37.190 M) NORTH OF REFERENCE DISK A, 897.00 FT (273.41 M) WEST OF REFERENCE DISK C AT 13TH STREET AND NORTH 89-52-29 WEST 1090.251 FT (332.309 M) FROM METRO CONTROL STATION HAGGINS E808.

Control Text

  • The horizontal coordinates were established by GPS observations 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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 X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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