Here’s a handy link for anyone that is concerned with time or getting stuck behind a barge.
Any tow over 8 barges is a double at L&D #3 (that means 2.5 hour wait)
Mississippi Vessel Location<<<
Other things to consider are tows that are coming up a pool and stop short of locking through. Many stop in Red Wing after traveling up from L&D #4.
Disclaimer: Do not rely on my time accuracy. Flow rates, size and weight of tow’s should be considered.
Bottom line…it’s a best guess and your results my vary greatly!