There's just so much wrong with that idea that I decided to make a list. Note that this doesn't even *approach* being a comprehensive list.
1. Enormous things get built by private enterprise all the time. On spec. Even with our enormous bloated government draining the economy. So money is not the problem.
2. If there is money to be made but not enough for your grandiose bridge project, private enterprise will come up with SOME kind of solution. Maybe not as scenic.
3. The government (via tons of building and environmental regulations, among other things) is generally the force *preventing* huge undertakings from going forward. See: nuclear power or gas pipelines or oil drilling. So looking to government "leadership" probably means that you didn't want that bridge built in the first place.
4. Said government "leadership" has no incentive to provide infrastructure that is actually well-designed and well-placed. As such it is generally inefficient and wastes most of the money it uses.
5. Government money is taken by force from the very people you claim can't make enough profits to do this on their own. Huh, I wonder if a crushing tax burden coupled with rising inflation has anything to do with that.