Denver
There has been a sluice of one form or another at Denver since 1651. The sluices play a major role in drainage of the fens. It is here you can cross the tidal river Great Ouse to join the Middle Level Navigations.
A walk of about a mile will take you to the Blackstone Engine Bar and Violets Tea Room at the site of Denver Mill.
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Lock Keeper 01366 382340 for details of crossing times.