I apologize for any confusion. The correct answer can depend on the specific context and the level of infrastructure in question.
In the United States, funding for maintaining bridges and highways typically comes from a combination of:
- Federal government: Through programs such as the Federal Highway Administration which allocates funds for national infrastructure.
- State government: Which is responsible for maintaining state highways and allocates its own resources for local infrastructure needs.
- Local government: Plays a role in the maintenance of local roads and smaller bridges.
If you are looking for a singular answer and based on common practice, the federal government is often the most recognized source for significant highway and bridge funding. If this was not what you were expecting, could you provide more context or clarify your question?