Not positive on this but I think the school is more or less in charge of the street when it owns property on both sides of it.
Not accurate. The city owns the street and the university owns the land on each side. The university maintains the grass on each side but it is actually city property. A bridge would not change this fact unless the city council changes the open container ordinance. This is why you see Ames PD people at the intersection and not ISU PD. ISU PD would not enforce city ordinances.