If you have the time and energy, go to as many open houses as possible. Just for the experience in assessing homes. You will see all kinds of things, good and bad, that will make you a better judge of a house. Look at foundations, roofs, electrical panels and wiring if accessible, plumbing, windows, attics, yard slope, positives and negatives of the neighbourhood etc. Only then, turn your attention to the "sexy" parts of the house, like layout, decor and landscaping. Because without all of the former factors lining up in your favour, the latter don't matter.
I have a hydro easement at the back of my yard, with one of those diagonal wire thingies running about 10' onto my property. In the 30 years I've lived here, it's never needed to be touched, but I'm careful not to put anything that would break my heart to have to dig up near it. For a canal, maybe it might need to be dredged or otherwise maintained periodically (?) in which case you would have machinery on your property. Just don't put anything difficult to move in that area, and it likely won't be a problem.