Riley's Lock and lockhouse
Map of planned route.
Great Falls of the Potomac River
A boat on the canal, circa 1900-1924
Boat entering Riley's Lock
Canal boats waiting to be unloaded in Georgetown.
Charles Wood was Lock 24 keeper "L.K." in 1865
Low-angle bird's-eye view of central Washington toward the west and northwest with The Capitol in foreground. The Canal is visible running along the mall.
Canal boat on Seneca Aqueduct over Seneca Creek in 1882
C&O Canal in the Georgetown neighborhood of Washington, D.C.
Seneca Creek, Seneca Aqueduct, and Riley's lock house in 2012
Boat construction yard in Cumberland, MD
John and Roberta Riley gravestone at Darnestown Presbyterian Church
Map of Terminus in Cumberland in the mid 1890s. Yellow dots indicate modern highways as well as current (2013) location of Canal basin.
Riley's Lock and lock house in 2020 as viewed from walkway on the Seneca Aqueduct over Seneca Creek
Register of waybills in the Cumberland Office, in 1858. Each canal boat had to have a waybill, even if empty, for passage through the canal. Fines were levied for lack of a waybill.
5 and 10 dollar notes, from C&O Canal company
Floodwaters around Lock 6 in 1936
Great Falls feeder culvert (no longer used) indicated by yellow arrow(14.08 mi), and Lock 18 (R).
Boat at Big Slackwater
An informal overflow. The towpath dips, allowing water to flow over it. Note the boards in the background for people to walk on.
Paw Paw Tunnel
Remains of the inclined plane
Culvert #30 lets Muddy Branch under the canal
Repairs at Big Pool
Mules being fed.
A steamboat on the C&O Canal. Note the steering wheel and the smokestack on this boat
Children tethered to canal boat. This photo was probably taken in one of the Cumberland basins.
Model interior of a C&O Canal freight boat
Recent view of the 9 mile level (between 33 and 34 miles) where the ghosts were reported to haunt.
Monocacy aqueduct in 2011, where the ghost of a robber could allegedly be seen on moonless nights

Riley's Lock (Lock 24) and lock house are part of the 184.5-mile (296.9 km) Chesapeake and Ohio Canal (a.k.a. C&O Canal) that operated in the United States along the Potomac River from the 1830s through 1923.

- Riley's Lock

This unique structure is the only aqueduct made from Seneca red sandstone and is doubly unique for being the only aqueduct on the C&O that is also a lock (Lock 24, Riley's Lock).

- Chesapeake and Ohio Canal

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Aqueduct, with Riley's Lockhouse at upper right.

Seneca Aqueduct

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Aqueduct, with Riley's Lockhouse at upper right.

Seneca Aqueduct — or Aqueduct No. 1 — is a naviduct that carries the Chesapeake and Ohio Canal (C&O) over Seneca Creek in Montgomery County, Maryland.

Seneca Aqueduct is a unique structure, not only being the first built, but also the only red sandstone aqueduct on the C&O−and the only aqueduct that is also a lock (Lock 24, or Riley's Lock).