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Details for Benchmark: JV3222

N 39° 36.417 W 077° 55.300 (NAD 83)

Altitude: 371.2

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

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

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I love how old this one is

Found while out enjoying canal history with the family. Sis had found previously and shared with us, so old.

[Photos:]
photoIMG_1116
photo2012-9-11-williamsport 030

We actually found this one last year. Oldest one to date. This BM is near Two Locks and at Dam 5.
There is also a U.S.G.S Benchmark at the Licking Creek Aqueduct , same chiseled square, same 1878 date, but not on benchmark list for Geocaching.com

[Photos:]
photoJV3222
photoBenchmark at Licking Creek

The oldest mark I have yet to log.

[Photos:]
photoJV3222, Four Locks, MD
photoJV3222 in context, Four Locks, MD
Panoramic view of the lock, C&O towpath, dam, power plant and a wasp that happened to fly into frame when I was taking one of the dozen pictures spliced together to make this panorama. See the full size image at http://flickr.com/photos/kordite/1313900921/

For having been exposed to the elements since 1878, it appears to be in remarkably good condition.

Recovered in good condition as described by previous loggers - nice area...

[Photos:]
photoC (JV3222) chiseled square - Washington County, MD
photoC (JV3222) area - view looking SW

found as described although the edges of the square have eroded some, possibly from freeze and thaw. so glad i came today as the river is very high and the water is thundering over the dam, amazing sight! julia51:)

[This entry was edited by julia51:) on Friday, February 03, 2006 at 10:20:30 AM.]

N 39° 36.420 W 077° 55.324

I'm pretty sure this is the mark, although the spot I take to be the "chisled square" is not what I would have expected...so I have a little uncertainty. The surrounding chisled "C" (as well as BM and USCS) seem to confirm the find, though.

I took a bike ride up the C&O towpath with my family today; it was about a 6 mile ride from Williamsport (although one can drive to a parking lot 30 yards away). The dam is of historical interest: it was constructed to provide a water supply for the canal. Markers describe how Stonewall Jackson attacked the dam in an attempt to disrupt canal and rail supply lines for the Union during the Civil War. Union forces were able to defend the site, and minor repairs brought restored operation in short order.

[Photos:]
photoC JV322, Hagerstown, MD mark
I take this squarish depression (between the B and M of next photo) to be the chisled square.
photoC JV322, Hagerstown, MD wider view
From a few feet away, the prior photo close-up of the believed "chisled square" can be seen between the B and M. The designation "C" is above; USCS stands for the United States Coast Survey, some of the earlier explorers of the country. The agency is now a part of the National Ocean Service. The date "1878" suggests when this was probably monumented.
photoC JV322, Hagerstown, MD surroundings
This view to the southwest shows original rubble dam below the existing dam. A small hydroelectric plant is on the West Virginia side of the Potomac River. GPS in foreground lies upon the benchmark.

Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1941 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1941 7 MI W FROM WILLIAMSPORT. 11.2 MILES SOUTHWEST ALONG THE WESTERN MARYLAND RAILROAD FROM THE STATION AT HAGERSTOWN, THENCE, 2.4 MILES SOUTHWEST ALONG A COUNTY ROAD, IN THE NORTHEAST WALL OF DAM NO. 5, 12.7 FEET NORTHWEST OF A POINT IN LINE WITH THE DAM, 3.4 FEET SOUTHWEST OF THE NORTHEAST EDGE, 1.7 FEET NORTHEAST OF THE SOUTHWEST EDGE.
01/01/1967 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1967 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The geoid height was determined by GEOID99.

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