The U.S. Army Corps of Engineers said as was the case with the previous two partial breaches, slough from the adjacent slopes filled the breach, minimizing flow over the levee in time for workers to close the gap.
The levee, located in Atchison County, Missouri, is in the Federal Program and is operated and maintained by the non-federal sponsor. It was constructed by the Corps.
The Corps said levees can be breached for a variety of reasons and at this point it is too early to determine what the cause or causes of these partial breaches may have been.
In reporting the latest breach the Corps also stressed how important it is for the public to stay off of the levees as it continues to assess the risk.
The Corps said it has contractors in place and are working expeditiously to raise Ditch 6 levee near Hamburg by an additional four feet to provide temporary flood protection for the community of Hamburg.
That work is 90-percent complete on the first of three segments. Work on segments two and three began Thursday. The contractor is trying to bring in additional resources to get the job done by June 14th.
The levee breach follows weeks of high flows and increasing releases from the main stem dams in Montana and the Dakotas. The Corps continues to aggressively monitor and evaluate the inundation areas.
Hundreds of people leaving flood-threatened homes on the rising Missouri River may not be able to return before late summer.
The river is set to reach peak flows within days, but won't get
back to normal until September as officials manage swollen reservoirs.
Hamburg officials are skeptical two levees protecting their town will withstand the onslaught and have ordered half the
town to evacuate. They warn any water that surges into Hamburg will be there to stay.
The timeline has even veteran river-town residents resigned. They're packing belongings to last a season and face weeks without an income.
One Hamburg business-owner who's already taken most merchandise out of his auto parts store said the precaution alone will cost him $35,000 in a month, even if the store remains dry.