The exact up-to-the-minute closures in Missouri are difficult to determine inasmuch as their DOT website is not following mouse commands to zoom in and out properly, but Iowa's "511" site seems up to date now. Bottom line:
Long segments of I-29 in the northwest corner of MO and the southwest corner of IA are currently affected by Missouri River flooding, including the entire segment between IA-2 (leading to NE-2, the shortcut to Lincoln, NE) and US 136 at Rock Port, MO, where Iowa DOT says closure will occur at any time, without further advance notice. Iowa now lists a number of segments of I-29 south from Council Bluffs to the Missouri line as closed in both directions as well as the I-680 crossing north of Omaha, where westbounders on I-80 bound for I-90 west would normally slant northwest. Iowa's website shows a detour for I-29 north traffic bound for I-80 and I-90 to take I-35 north out of Kansas City, MO to Des Moines, IA, where I-80 westbounders are directed to I-480 crossing to Omaha, NE, and I-90 westbounders are directed to remain on I-35 to Albert Lea, MN (!) reaching I-90 there and turning west, thereby avoiding crossing the Mighty Mo and avoiding its eastern shore floodplain entirely until Chamberlain, SD, where a high bridge carries I-90 over it.
This makes crossing at Kansas City, St Joseph, and possibly other MO to KS or MO to NE bridges of interest rather than the lengthy detours. That is, if the other crossings are elevated well above the floodplain, which is not the case in the southwest corner of Iowa. I'm working on what the alternatives may be, if any, for crossings between I-480 at Omaha and I-70