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Details for Benchmark: HV1814

N 38° 56.667 W 077° 06.950 (NAD 83)

Altitude: 165.94

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

Location:
In MONTGOMERY county, MD View Original Datasheet
Designation:
109 WSSC
Marker Type:
chiseled square
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Looked at area from previous pictures - believe this one to be gone - looks like the cement work was redone.

Found as described, along the Capital Crescent Trail, just North of the Dalecarlia Tunnel.

[Photos:]
photoHV1814
Looking down from the corner of the bridge.
photoBridge 14.
Approaching HV1814 from the South.
N 38° 56.682 W 077° 06.957

This chiseled square was found. It is a 2-inch chiseled square at the the top of the Northeast corner of the Southeast retaining wall. The railroad bridge is now a bike path bridge.

[This entry was edited by Black Dog Trackers on Saturday, November 05, 2005 at 6:13:19 PM.]

[Photos:]
photoAt 109 WSSC in Montgomery County, MD
The white arrow points to the location of the chiseled square. The view is looking North.
photo109 WSSC in Montgomery County, MD
The chiseled square.

Documented History (by the NGS)

Unknown by WSSC (MONUMENTED)
01/01/1933 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1933 AT BROOKMONT. AT BROOKMONT, MONTGOMERY COUNTY, ON THE GEORGETOWN BRANCH OF THE BALTIMORE AND OHIO RAILRAOD, 270 FEET NORTH OF THE NORTH PORTAL OF DALECARLIA TUNNEL, 40 FEET WEST OF THE INTAKE LOCKS OF DALECARLIA RESERVOIR, AT STEEL BRIDGE NO. 14, ON THE NORTHEAST END OF THE SOUTHEAST RETAINING WALL, 9.5 FEET EAST OF THE CENTERLINE OF THE TRACK, AND ABOUT 1 FOOT BELOW THE TOP OF THE RAIL. A CHISELED SQUARE.
01/01/1953 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 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.
  • 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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