The Ohio has pretty extensive locks and dams, though apparently the big historical choke point was at Louisville just to the east of Ft Knox. It's more naturally navigable west towards the Mississippi, though extensively controlled in the direction as well.
If you can make it 600 km downriver, though, you're right at Cairo, IL, at the confluence of the Ohio and Mississippi, where 194th set up cantonment. And from there, you're on the Mississippi and navigable south to Memphis where 197th brigade is set up -- basically in the middle of one of MilGov's stronger held areas.
The Missouri is also accessible from the Mississippi and navigable for quite a ways out onto the Great Plains and Mountain states, but if Wikipedia is to be believed, it's likely lack of human intervention will rapidly make it unusable by large craft even with shallow drafts. And the fact that it flows through Omaha, Nebraska and the CivGov cantonment there means it is not going to be a highway for MilGov.
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