Cedar Falls residents Amanda Rose, left, Josh Bergeron, center, and Terry Williams, right, sand bag the Main Street Bridge along the Cedar River near downtown Cedar Falls, Iowa, Tuesday, June 10, 2008. The rising Cedar River was causing the most concern in Cedar Falls, where officials were preparing residents and downtown business owners to evacuate as the river threatened to spill over a levee that protects the area. (AP Photo/David K Purdy).