The Seneca Aqueduct

The Seneca Aqueduct (HM4PC)

Location: Poolesville, MD 20837 Montgomery County
Buy Maryland State flags at!
Country: United States of America
Buy United States of America flags at!

N 39° 4.132', W 77° 20.453'

  • 0 check ins
  • 0 favorites
Canal engineers build aqueducts to bridge canal boats over rivers and large stream such as Seneca Creek. Eleven aqueducts were needed between here and the canal's western terminus at Cumberland, Maryland; all required skilled quarrymen and stonemasons, and large outlays of scarce capital.

Seneca Aqueduct opened to traffic in 1833, and along with through-boats from the west, carried a substantial local traffic in lime, grain, fertilizer and sandstone to and from farms and industries around Seneca. Made of red sandstone from nearby bluffs, it has long been one of the most admired canal structures.

Freshets and flooding on Seneca Creek have always caused problems, and finally in September, 1971, almost 50 years after the canal closed, a violent local flood swept away one of the arches.

The last locktender at Seneca was Johnny Riley, whose former lock and lockhouse are at the east end of the aqueduct. "I don't care what hour of the night it was," recalled a former boatman, "any hour of the night you boat to his lock and holler . . . there was his lantern waving you ahead."
HM NumberHM4PC
Series This marker is part of the Chesapeake and Ohio Canal series
Marker ConditionNo reports yet
Date Added Sunday, September 7th, 2014 at 2:52pm PDT -07:00
Sorry, but we don't have a picture of this historical marker yet. If you have a picture, please share it with us. It's simple to do. 1) Become a member. 2) Adopt this historical marker listing. 3) Upload the picture.
Locationbig map
UTM (WGS84 Datum)18S E 297483 N 4327027
Decimal Degrees39.06886667, -77.34088333
Degrees and Decimal MinutesN 39° 4.132', W 77° 20.453'
Degrees, Minutes and Seconds39° 4' 7.92" N, 77° 20' 27.18" W
Driving DirectionsGoogle Maps
Area Code(s)301, 240
Closest Postal AddressAt or near 31 Chesapeake and Ohio Canal Towpath, Poolesville MD 20837, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

Is this marker missing? Are the coordinates wrong? Do you have additional information that you would like to share with us? If so, check in.

Nearby Markersshow on map
Check Ins  check in   |    all

Have you seen this marker? If so, check in and tell us about it.

Comments 0 comments

Maintenance Issues
  1. What historical period does the marker represent?
  2. What historical place does the marker represent?
  3. What type of marker is it?
  4. What class is the marker?
  5. What style is the marker?
  6. Does the marker have a number?
  7. What year was the marker erected?
  8. Who or what organization placed the marker?
  9. This marker needs at least one picture.
  10. Can this marker be seen from the road?
  11. Is the marker in the median?