Here you all can see something on youtube that shows how private enterprise deals with infrastructure when it has to do it.
On this youtube channel you can see videos reporting progress and a final opening of a bridge that was fixed privately by some entrepreneurs, who put together money, resources, machinery (one of them, Sergei Zaharov owns a metal shop).
The bridge was going to be fixed by the local government for 13.5 Million rubles, which is about 445000 USD, however the private businessmen spent their own time (3 months altogether), a total of 40 people were involved in the project and they fixed the bridge for only 300,000 rubles, which is only about 10,000 USD.
You can see the video of the opening of the bridge once it was fixed here.
Private individuals can and do in fact restore and maintain infrastructure and they do it at a fraction of the cost of what government spends (or wants to spend).
Despite all the naysayers out there.