What are the 4 bridges that cross Niagara River from Canada into US?

There are two bridges that cross the Niagara River from Canada into the US, not four:

* Rainbow Bridge: The most famous and busiest bridge, connecting Niagara Falls, Ontario to Niagara Falls, New York.

* Whirlpool Rapids Bridge: This bridge is further downriver, connecting Niagara-on-the-Lake, Ontario to Lewiston, New York.

While there are other bridges crossing the Niagara River, they are not between Canada and the US. For example, the Queenston-Lewiston Bridge is a pedestrian bridge connecting Niagara-on-the-Lake, Ontario to Lewiston, New York.