A controlled blast will be conducted on the BNSF Rail Bridge over the Big Sioux River to demolish the bridge. During the blast, everyone within 1,000 ft is asked to remain indoors. The blast is scheduled for 7:00 a.m. on the morning of Friday, August 16. Remain indoors from 6:30- 7:30 a.m. All roads within this area will also be closed during the blast. Security will be at various checkpoints in…