The Shannon, Tyrone, Boyne, and Maigue Navigations are maintained in good working order by ordinary repair.
Twenty-seventh Report from the Board of Public Works, Ireland: with the Appendices 1858 HMSO, Dublin 1859
That was all the Board had to say about its inland navigations.
Irish waterways history 
I do like these post Brian keep up the good work.
BTW I’ve done Lower Lough Erne on my map, now for the more difficult Upper Lough Erne.
Thank you. bjg