Here are some pages about the Junction Navigation in the Ballinamore & Ballyconnell drainage district. It later became known as the Ballinamore & Ballyconnell Canal and later still as the Shannon–Erne Waterway.
The role of the cads and bounders of the Ulster Canal Company in getting a canal built at taxpayers’ expense
The construction of the Junction Navigation at Aghoo (Lock 4)
Lock gear old and new
And here’s a reminder of an old page about the Belturbet-built dredger used in constructing the navigation.
Irish waterways history 