River in PG Uber Scenario 4

[plloyd1010]

Question 1: When I see a river on the map, as it is the case with PG Uber Scenario 4, and the scenario sheet says nothing about it, should I assume it is a major or a minor river?

The river note is under the scenario start time. In this case it is minor.
 

Question 2: Is it correct that no units can cross a major river without the help of engineers?

That is correct.
 

Question 3: Is it correct that, in case of minor rivers, leg and track can cross them, albeit at a cost, while motorized units still need the help of engineers?

That is also correct.