The impact of the bridge collapse on river traffic should be minimal. King at SCSU Scholars has a post on the subject. According to the Mn/DOT river guide, there are only three terminals upstream from the collapse, and none of them handle grain. Most of the grain is loaded on the Minnesota River which joins the Mississippi further downstream.
The good news that I have to report today is that as of 6am, the river elevation below the Upper St. Anthony Lock (the next one up) is up over 9 feet from yesterday. The elevation above Lock and Dam #1 (the next one down) is down almost 3 feet since yesterday. This means that the river level around the collapse site should be falling enough to aid the recovery effort.
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