A crew of U.S. Fish & Wildlife Service employees reinforce a levy to stop flood waters more than a mile away from the Missouri River in rural Missouri Valley, Iowa, June 17, 2011. The Missouri River, swollen by heavy rains and melted snow, has been flooding areas from Montana through Missouri.

Vehicles sit stranded in flood waters in rural Missouri Valley, Iowa June 17, 2011. Missouri River floodwaters have reached a levee built up this week to protect Hamburg, Iowa, after the main protection along the river failed, a county emergency official said on Thursday.

U.S. Fish & Wildlife Service employees reinforce a levy more than a mile away from the Missouri River in rural Missouri Valley, Iowa, June 17, 2011.

Steve Howerton ties a sandbag as U.S. Fish & Wildlife Service employees reinforce a levy to stop flood waters more than a mile away from the Missouri River in rural Missouri Valley, Iowa, June 17, 2011.

A pickup truck is submerged on an access road just east of Blair, Nebraska, June 12, 2011. Residents have been shoring up levees along the Missouri River from Montana through Missouri as federal officials widen flood gates to allow record, or near-record water releases to ease pressure on six major reservoirs swollen by heavy rains and melting snow.