Officials hope temporary levee will save Iowa town

HAMBURG, Iowa — A temporary earthen levee is the only barrier standing between Hamburg and the floodwaters of the Missouri River, and officials hope efforts to beef it up will be enough to keep the small southwestern Iowa town from filling up like a bathtub.

Crews working for the Army Corps of Engineers hope to pile at least three feet of extra dirt atop the levee before Wednesday evening. The stakes are high: If it fails, parts of the town could be covered by as much as 10 feet of water within days. And high water could linger for months.

The hurriedly constructed levee became Hamburg's last line of defense after the river punched through another levee downstream in northwest Missouri that provided the town's primary protection. That failure left water gushing through a large gap on a path to inundate the town of 1,100 — unless the other levee can be made taller.

"I feel good about it," Fire Chief Dan Sturm said. "But we can't guarantee anything. We've never really had to cope with anything of this magnitude."

Even though the levee breach was downstream, the floodwaters were flowing north to fill the area around Hamburg because the town sits in a valley. The fire chief compared the geography to a slowly filling bathtub.

The corps doesn't expect the flooding to reach the new levee until sometime Wednesday.

A gazebo stands in the strong current of the Missouri River, in South Sioux City, Neb., Tuesday.

"You can see the water coming," said Col. Bob Ruch, commander of the corps' Omaha district.

The river has been rising steadily for weeks as the corps increases the amount of water released from its dams to clear out heavy spring rain and snowmelt.

Releases at Gavins Point Dam in South Dakota hit the maximum planned amount of 150,000 cubic feet of water per second on Tuesday. So officials downstream in Nebraska, Iowa and Missouri were sure to be watching for more levee problems.

The dam releases are expected to raise the Missouri River 5 to 7 feet above flood stage in most of Nebraska and Iowa. In Missouri, the river may climb 10 feet above flood stage in some places and spill over the top of several rural levees.

Parts of Montana, North Dakota and South Dakota have already seen some flooding, and a section of Interstate 680 that connects Omaha, Neb., and Iowa has been closed because water has crept onto the roadway. Officials predict the problems will linger through the summer because of the large volume of water already in the river and the larger-than-usual Rocky Mountain snowpack.

The corps does not expect to reduce the amount of water released from the dams until at least August.

So far, the floodwaters have covered mostly corn and soybean fields with few structures. But it's an unwelcome development for farmers because grain supplies are at historically low levels and demand is strong for every bushel of corn and soybeans.

Still, the loss of the crops is unlikely to affect overall U.S. production because the areas underwater are relatively small.

Mike Nenneman, a farmer from Sidney, is waiting for the floo line of tractor-trailers carrying dirt to the levee stretched for more than a quarter-mile Tuesday morning. Once the trucks reached the work area, tractors and other earth-moving equipment carried and pushed it to the levee.