Protecting Cultural Resources

Protecting Cultural Resources (HMGP0)

Location: Clear Spring, MD 21722 Washington County
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Country: United States of America
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N 39° 36.42', W 77° 55.316'

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Floods occur at regular intervals in the Potomac Valley. Between 1829 and 1998 there have been 144 recorded floods or high water occurrences. repairing flood damage was a continuing battle for the C&O Canal Company and is still a problem for the National Park Service. During periods of low water, the remains of the original crib and rubble dam, destroyed by floods can be seen downstream from the present dam built in 1857.

In 1998, the guard lock and flume were filled with soil to halt the collapse of the stone walls. A section of the towpath that was collapsing was replaced with "Roller Compacted Concrete (RCC)" which is a concrete mix with a small amount of cement and a high amount of gravel. The stone for the aggregate was acquired locally to match the stone already used here. The RCC is spread and compacted by a roller and does not require formwork like conventional concrete. By filling the lock and bypass flume and reconstructing the towpath and guard dike, the National Park Service is trying to protect the historic structures from future flood damage.
HM NumberHMGP0
Placed ByChesapeake and Ohio Canal National Historic Park and U.S. Department of Interior, National Park Service
Marker ConditionNo reports yet
Date Added Tuesday, September 2nd, 2014 at 2:53am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)18S E 249140 N 4388219
Decimal Degrees39.60700000, -77.92193333
Degrees and Decimal MinutesN 39° 36.42', W 77° 55.316'
Degrees, Minutes and Seconds39° 36' 25.20" N, 77° 55' 18.96" W
Driving DirectionsGoogle Maps
Area Code(s)301
Closest Postal AddressAt or near 13107 Chesapeake and Ohio Canal Towpath, Clear Spring MD 21722, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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