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Details for Benchmark: HV1839

N 38° 53.517 W 077° 02.000 (NAD 83)

Altitude: 8.13

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:
RV VENT
Marker Type:
rivet
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Did not see rivet today. Mark may be under the cover; didn't remove cover to check. Description seems to indicate coaming is outside of the cover.. didn't see such a coaming on this cover.. also, cover seemed relatively new.

No luck here either..

Found the grill and its coaming has lots of nicks and scratches and rust spots, but no rivet.

Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1956 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1956 AT WASHINGTON. AT WASHINGTON, D.C., NEAR THE SE QUADRANT OF THE INTERSECTION OF CONSTITUTION AVENUE AND 15TH STREET NW, 71 FT S OF THE GATE POST AT THE CORNER, 8.3 FT E OF THE E CURB ALONG 15TH STREET, IN THE SE CORNER OF THE COAMING AROUND A 4-FT SQUARE GRILL.

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 June 1991.
  • 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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