Guard lock No 6
Guard lock No 6 is on the Chesapeake and Ohio Canal near to Blackburn.
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.

| Fifteen Mile Creek Aqueduct | 7.25 miles | |
| Indigo Neck Lock No 57 | 5.48 miles | |
| Sideling Hill Creek Aqueduct | 2.64 miles | |
| Sideling Lock No 56 | 2.28 miles | |
| Long Hollow Lock No 55 | 0.01 miles | |
| Guard lock No 6 | ||
| Capacon Lock No 54 | 0.22 miles | |
| Irishman's Lock No 53 | 4.31 miles | |
| Tonoloway Creek Aqueduct | 10.05 miles | |
| Hancock 2 Lock No 52 | 10.09 miles | |
| Hancock 1 Lock No 51 | 10.37 miles | |
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Wikipedia has a page about Guard lock
A control lock, guard lock or stop lock differs from a normal canal lock in that its primary purpose is controlling variances in water level rather than raising or lowering vessels. A control lock may also be known as a tide lock where it is used to control seawater entering into a body of fresh water.
