Bench Mark "A"

Bench Mark "A" (HM3WJ)

Location: Hagerstown, MD 21740 Washington County
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Country: United States of America
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N 39° 38.57', W 77° 43.371'

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"In October 1877, Bench Mark "A" was cut on the water table of the recently rebuilt courthouse in Hagerstown, Maryland", reads the report of the coast and geodetic survey to President McKinley. This was the beginning point of a transcontinental level line which by way of Williamsport and then along the C&O Canal reached Hancock in one month but it was not until 1904 that the line extended from the Atlantic to Pacific Oceans.

Bench Mark "A" is not just of historical interest, but has been included in leveling surveys conducted in 1931, 1941, and 1979. It has remained very stable in relation to other nearby marks. This mark was chosen to be part of a releveling project completed in 1988.
HM NumberHM3WJ
Marker ConditionNo reports yet
Date Added Tuesday, October 21st, 2014 at 6:12am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)18S E 266355 N 4391659
Decimal Degrees39.64283333, -77.72285000
Degrees and Decimal MinutesN 39° 38.57', W 77° 43.371'
Degrees, Minutes and Seconds39° 38' 34.20" N, 77° 43' 22.26" W
Driving DirectionsGoogle Maps
Area Code(s)240, 301
Closest Postal AddressAt or near 2-24 US-40 ALT, Hagerstown MD 21740, US
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