Workers add sandbags to a levee being built to protect Cargill’s corn milling facility from Missouri River flood waters, in Blair, Neb., Wednesday, June 8, 2011. Nebraska Gov. Dave Heineman said the state is preparing for the worst as the Missouri River continues to rise. (Nati Harnik / AP)

UNION, Neb. (AP) – Crews along the Missouri River say they are keeping a cautious eye on Nebraska’s man-made flood barriers, with a focus on the southeast community of Lake Waconda.

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.