Sure we need some new bridges, and there are probably a thousand or so that actually need to be replaced. But our infrastructure is deficient in many more important ways. I just hope money needed for less sexy projects doesn't go to bridges. Her e are some of the things we need more than bridges:
Municipal water supplies. Flint wasn't just a case of local mismanagement, it was just the most visible. Local election reform is needed, but more importantly there are thousands of towns with aging, blocked-up pipes and waterworks. They don't get fixed until someone's house burns down because there wasn't enough mains pressure for the hydrant. Sewage overflows that cost millions to fix, inappropriate water savings programs, and high water taxes for businesses are just three of the symptoms of an aging water supply.
Research on longer-lasting roads. If we spend a billion on this now we'll save a billion per year from now on.
Better isolation and more intelligent routing for the high voltage mesh electrical network. We've spent a good deal on this, but shortcuts have been made. Sagging lines can cascade into regional failure. The most effective and least sexy way to deal with it is building more electrical transit capacity for cities that need it. A few places could definitely use municipal and larger power storage via hydroelectric, batteries, or whatever's clever.
And while we're talking about electricity it's time to reform municipal power to encourage user level solar power. Switch pricing to grid plus/minus usage with an instant rebate for the poor. I know that's not something the federal government regulates, but a study that strongly proves the economics should encourage local adoption of the plan. If it doesn't add in some bullshit grant to encourage it. After it's been working well and obviously saving money for a few dozen cities phase out the grants.
Nuclear power, and use the united house, congress, and prez to tell the NIMBY's to stuff it. Sell it politically by pointing out the fact that coal jobs are never coming back and jobs jobs jobs.
My 2 cents.