This video explains that Shell Creek is a problem. The levees along the river have been recently rebuilt and are expected to hold.
(new window) I could not find a date for this video. But I accessed it before 3/16/19.
The video's comments include: "Meanwhile, Ericson Dam in north-central Nebraska is at high risk of failing as the Cedar River continues to rise, according to a report by the National Weather Service."
The video also mentioned that a farmer was killed. I've read that he was driving to save several stranded cars, but a bridge collapsed when he drove his tractor over it.
Spencer Dam is never going to generate hydro power again. And the 10' or 12', depending on source, wall of water unleashed by the broken dam took out a popular trail bridge.
The video also mentioned that the release of the Gavins Dam was quadrupled to 90,000 cfs.