Last year's historic U.S.
Currently, the EIA is forecast levels to rise in the near-term, but then fall back to its lows. And that could mean more trouble for trade.
From the EIA:
As a result of last year's drought, stretches of the Upper
Large stretches of the Upper Mississippi have seen low water levels, although for the most part the Lower Mississippi River Basin (after the confluence of the Ohio and Mississippi rivers, near the Missouri, Illinois, and Kentucky borders) has remained at normal water levels. When levels start to drop below certain points, barge traffic is slowed because of congestion in the narrower portion of the river that remains navigable.
Here's a chart from the EIA showing current levels and projected levels: