Yes, but all those (except maybe internet) are routine maintenance-level tasks, as opposed to megaprojects.
Tell that to the hyperloop guys and watch them despair.
Happily. Who needs hyperloop when airline tickets are this cheap?
There are places around the edges that need major work. Our population is expanding, that means we need new houses for the new people. Once in a while houses burn down or is otherwise destroyed. Likewise water treatment plants need maintenance and upgrades, and sometimes we need a new one; but for the most part people have perfectly safe water.
On the whole though there are a lot of perfectly good roads and houses that just need a little work to keep them up. It is better to not build more than we need. I could tear down my perfectly good 2000 sq ft house and build a 4000 square ft house - but my current house is big enough for my needs so I'd rather sit back and relax.
.... Kind of, and much of what we have could be upgraded. Some folks can't get clean water out of their taps (lead!), some folks have really crappy internet (dial-up or otherwise slow speeds). I'm pretty sure some areas could use an electrical grid upgrade. Railroad tracks laid long ago now block traffic and some crossings have a lot of accidents, and could be rerouted (some communities have done so, such as lafayette, Indiana). Many of our bridges are in disrepair.