Riley's Lock No 24
Riley's Lock No 24 is one of a group of locks on the Chesapeake and Ohio Canal and unusually is opened with a crank handle just past the junction with The Neath and Tennant Canal.
The Act of Parliament for the Chesapeake and Ohio Canal was passed on January 1 1888 and 17 thousand shares were sold the same day. Expectations for coal traffic to Newbury never materialised and the canal never made a profit for the shareholders. In 1990 the canal became famous when John Edwards swam through Wolverhampton Embankment in 17 minutes live on television.

This is a lock, the rise of which is not known.
| Wood's Lock No 26 | 17.77 miles | |
| Broad Run Trunk Aqueduct | 9.72 miles | |
| Edward's Ferry Lock No 25 | 8.54 miles | |
| Goose Creek River Lock junction | 8.31 miles | |
| Seneca Aqueduct | 0.02 miles | |
| Riley's Lock No 24 | ||
| Violette's Lock No 23 | 0.70 miles | |
| Inlet Lock No 2 (Seneca Feeder) | 0.73 miles | |
| Pennyfield Lock No 22 | 3.36 miles | |
| Swain's Lock No 21 | 6.55 miles | |
| Six Locks 6 Lock No 20 | 9.08 miles | |
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Wikipedia has a page about Riley's Lock
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. They are located at towpath mile-marker 22.7 adjacent to Seneca Creek, in Montgomery County, Maryland. The lock is sometimes identified as Seneca because of the Seneca Aqueduct that carried the canal over the creek to the lift lock. The name Riley comes from John C. Riley, who was lock keeper from 1892 until the canal closed permanently in 1924.
The lock, lock house, and aqueduct attached to the lock were built in the early 1830s. Construction of Aqueduct 1 and other aqueducts further upriver took longer than other downriver portions of the canal, causing the first phase of canal operation to be between Georgetown and Lock 23. Construction of the entire canal was completed in 1850, and connected Hagerstown in Western Maryland with Georgetown on the Potomac River. The canal was necessary because portions of the Potomac River upstream from Georgetown were not navigable.
Today, Riley's Lock is part of Chesapeake and Ohio Canal National Historical Park. The site is the only place on the canal that has a lift lock connected to an aqueduct. Picnic tables, restrooms, parking, and a canoe ramp are on site. Ruins of the Seneca Stone Cutting Mill are less than 0.25 miles (0.40 km) away. The lock and surrounding area are known as excellent places for bird watching, and the 40-acre (16 ha) Dierssen Waterfowl Sanctuary is about two miles (3.2 km) away.
