Seneca in Montgomery County, Maryland — The American Northeast (Mid-Atlantic)
Seneca
Chesapeake and Ohio Canal National Historical Park
| | National Park Service, U.S. Department of the Interior | |
Photographed by Don Morfe, July 23, 2016
1. Seneca Marker
Eleven aqueducts were built from Georgetown to Cumberland to carry water over water. The aqueducts, literally water bridges, carried the canal over large streams and rivers flowing into the Potomac River. This aqueduct enters directly into the lock, the only one on the canal to do so.
The Seneca Creek Aqueduct, or Aqueduct Number One, Lock 24, and the lockhouse were built of Seneca Red Stone quarried nearby. This same distinctive sandstone was used to construct the Smithsonian Castle on the Washington Mall.
[Captions:]
The Riley name is forever linked to Lock 24. The Riley family (right) lived in the lockhouse for many years. After John Riley (on left in photo) died, Mrs. Riley took over duties as lockkeeper and had over 45 years of service here.
A canal boat entering Seneca Aqueduct is carried over the Seneca Creek.
Erected by National Park Service, U.S. Department of the Interior.
Topics and series. This historical marker is listed in this topic list: Waterways & Vessels. In addition, it is included in the Chesapeake and Ohio (C&O) Canal series list.
Location. 39° 4.127′ N, 77° 20.449′ W. Marker is in Seneca, Maryland, in Montgomery
this page online
Regionally, this marker is in the Washington Metropolitan Area. It is also in the American Mid-Atlantic. Globally, it is in the North Atlantic Region, North America, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once one of the original Thirteen Colonies and also the Antebellum South.
Other nearby markers. At least 8 other markers are within walking distance of this marker: Rowsers Ford (a few steps from this marker); Seneca: Average Mans Resort (approx. 0.2 miles away); Seneca Creek: A Raging River (approx. 0.2 miles away); A Veterans Life in Montgomery County (approx. Ύ mile away); Seneca Mills During the Civil War (approx. Ύ mile away); Seneca Store (approx. Ύ mile away); Seneca Mill (approx. Ύ mile away); a different marker also named Seneca Store (approx. Ύ mile away). Touch for a list and map of all markers in Seneca.
Other markers no longer nearby. The Seneca Aqueduct (was a few steps from this marker but has been confirmed missing); Watering the Canal (was approx. 0.7 miles away but has been confirmed missing); a different marker also named Seneca (was approx. 0.7 miles away but has been confirmed missing).
Related marker. Click here for another marker that is related to this marker. This links to the original wayside at the site, "The Seneca Aqueduct".
Photographed by Don Morfe, July 23, 2016
2. Seneca Marker
Photographed by Don Morfe, July 23, 2016
3. Seneca Creek-Riley's Lock #24
Photographed by Don Morfe, July 23, 2016
4. Seneca Creek Aqueduct
Photographed by Don Morfe, July 23, 2016
5. Seneca Creek-Riley's Lock #24
Photographed by Don Morfe, July 23, 2016
6. Seneca Creek tow path.
Photographed by Allen C. Browne, September 4, 2016
7. The Seneca Aqueduct
Photographed by Allen C. Browne, September 4, 2016
8. The Riley Family
The Riley name is forever linked to Lock 24. The Riley family lived in the lockhouse for many years. After John Riley (on the left of the photo) died, Mrs. Riley took over duties as lockkeeper and had over 45 years service here.Close-up of photo on marker
Photographed by Allen C. Browne, September 4, 2016
9. Riley's Lockhouse
Credits. This page was last revised on March 20, 2026. It was originally submitted on July 25, 2016, by Don Morfe of Baltimore, Maryland. This page has been viewed 696 times since then and 18 times this year. Photos: 1, 2, 3, 4, 5, 6. submitted on July 25, 2016, by Don Morfe of Baltimore, Maryland. 7, 8, 9. submitted on September 5, 2016, by Allen C. Browne of Silver Spring, Maryland. • Bill Pfingsten was the editor who published this page.
