River Thames Thames Estuary), the river is subject to tidal activity from the North Sea. Before the lock was installed, the river was tidal as far as Staines, about upstream. London, capital of Roman Britain, was established on two hills, now known as Cornhill and Ludgate Hill. These provided a firm base for a trading centre at the lowest possible point on the Thames. A river crossing was built at the site of London Bridge. London Bridge is now used as the basis for published tide tables giving the times of high tide. High tide reaches Putney about 30 minutes later than
Songo River Queen II 1981. The current vessel is located at the Route 302 Causeway in Naples, Maine. Both the original "Songo River Queen" and the "Songo River Queen II" were built by Frank C. Gerrish, Jr. The "Queen" has been an annual summer attraction on the Naples Causeway since 1970, making daily excursions on Long Lake as well as through the swing bridge onto Brandy Pond and through the twists and turns of the Songo River into the hand-operated Songo Locks. Songo River Queen II The Songo River Queen II is a diesel-powered stern paddle-wheeler, built as a replica of the steam-powered vessels