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Details for Benchmark: JV1546

N 39° 34.283 W 076° 37.100 (NAD 83)

Altitude: 309.03

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

Location:
In BALTIMORE county, MD View Original Datasheet
Designation:
25 PRR
Marker Type:
bolt
Setting:
massive structures
Stability:
Probably hold position/elevation well.

Must Read!

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I liked this one.

Found and used while doing Land Surveying work in the area.

[Photos:]
photo25 PRR (JV1546)

Found as described in good condition.

[Photos:]
photoJV1546 mark: 25 PRR Corbett MD
Mark and GPSr showing chiseled "BM 25" near mark and square around mark.
photoJV1546 mark2: 25 PRR Corbett MD
Close up of mark and GPSr to capture coordinates
photoJV1546 area N: 25 PRR Corbett MD
View to the N; mark is lower right to the right of the parked bicycle, indicated by notebook.

Beautiful sunny day in April. Located the bridege that used to carry a railroad but now is a hike-bike trail called the North Central Railroad (NCRR)Trail. The benchmark was located on the Southeast corner of the bridge. Interestingly I had to watch out for a number of black snakes that were sunning themselves in the early spring weather. Unfortunately Turtle was not able to join me today.

[Photos:]
photo25 PRR
This benchmark is a copper bolt in a bridge and is marked with BM 25.

Documented History (by the NGS)

Unknown by PRR (MONUMENTED)
01/01/1935 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1935 AT CORBETT. AT CORBETT, BALTIMORE COUNTY, 0.3 MILE NORTH OF THE PENNSYLVANIA STATION, ABOUT 510 FEET SOUTH OF SIGNAL 22.6, IN THE TOP OF THE EAST END OF BRIDGE 22.41, AND 10 FEET EAST OF THE CENTERLINE OF THE EAST TRACK. A COPPER BOLT.

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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