The proposed highway was to run from Illinois Route 80 near Port Byron , Illinois , which ran along the eastern bank of the Mississippi River , over a new bridge into Iowa , to the South Omaha Bridge where US 275 crossed the Missouri River .
The proposed highway was to run from Illinois Route 80 near Port Byron , Illinois , which ran along the eastern bank of the Mississippi River , over a new bridge into Iowa . 
 It would then span across the state to the South Omaha Bridge where US 275 crossed the Missouri River .