Longford Harbour was an end point on a spur of the Royal Canal which was added to link Longford town to the canal network. Richmond Harbour at Clondra had been the main point until the spur was added c 1815. When Longford was connected to Dublin by rail, the canal went into rapid decline, and was eventually closed. The harbour was filled in and for many years it held the town swimming pool. Today it is a car park but there are still plans to re install the harbour, ... in the current economic climate this may have to wait.
Contact Martin Morris, County Archivist, Longford County Library, - he may be able to help with your enquiry regarding harbour masters & photos of the harbour.
The old harbour master's house is still in existence