Nebraska Emergency Management Agency spokesman Mike Wight says officials are most concerned now about the recent levee break near the town, 25 miles south of Omaha.
Wight said crews are monitoring the levees are looking for water seepage, boils, or any other structural trouble signs.
Wight said officials were urging the public not to walk on levees anywhere along the river, in case they fall or if a flood barrier suddenly ruptures.
He said levee workers have not seen only a scattering of onlookers climbing on top.
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