After many long days, I have finished the pages for the Rockville Navigation. The material is spread across three pages, the second of which has lots of photos. You can access the pages from the sidebar on the right or from the Lost Irish waterways page (see above for the link).
I haven’t really finished it, though, because there are many gaps in my knowledge. If you can help to fill any of them, or if you find I’ve got anything wrong, please leave a comment.