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Details for Benchmark: HV1326

N 38° 52.117 W 076° 59.800 (NAD 83)

Altitude: 10.67

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:
319 PBPP
Marker Type:
survey disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Was in the area geocaching and munzee'ing. Benchmark still

Found as described in good condition

[Photos:]
photoHV1326 mark 319 Washington, DC
Mark and GPSr
photoHV1326 area NW Washington DC
View to the NW, mark at right indicated by arrow. Washington Navy Yard across river in background with museum ship USS BARRY visible

found while out and about

Recovered in good condition

N 38° 52.135 W 076° 59.822

This survey disk was found as described.

[Photos:]
photoAt station 319 in Washington DC
The view is looking North across the Anacostia River toward the Washington Navy Yard. The disk is just in front of the black GPS unit on the right corner of the fancy sewer top.
photoAt station 319 in Washington DC
Eye level view of the station.
photoStation 319 in Washington DC
The disk.

Located just across the river from the Navy ship.

[Photos:]
photoview north
photoclose up

Documented History (by the NGS)

Unknown by PBPP (MONUMENTED)
01/01/1942 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1942 IN WASHINGTON. IN SOUTHEAST WASHINGTON, IN ANACOSTIA PARK, OPPOSITE THE NAVAL GUN FACTORY, AT THE THIRD SEWER OUTLET SOUTHWEST OF THE ELEVENTH STREET BRIDGE, IN THE TOP OF THE EAST CORNER OF THE CONCRETE HEADWALL, 11 INCHES NORTHWEST OF THE SOUTHEAST COPING, AND 10 INCHES SOUTHWEST OF THE NORTHEAST COPING. A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED 319.
01/01/1960 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 RECOVERED IN GOOD CONDITION.

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. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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