A trailer that floated down the Rio Grande, driven by dam releases upstream and rain-swollen tributaries following last week's Hurricane Alex, is secured to the bank, Friday, July 9, 2010, in Nuevo Laredo, Mexico. The river has crested, but is not expected to drop for several days. (AP Photo/Eric Gay)

Photo by: Eric Gay

A trailer that floated down the Rio Grande, driven by dam releases upstream and rain-swollen tributaries following last week's Hurricane Alex, is secured to the bank, Friday, July 9, 2010, in Nuevo Laredo, Mexico. The river has crested, but is not expected to drop for several days. (AP Photo/Eric Gay)