<P> In Oregon, an estimated one million people were expected to arrive that the Oregon National Guard was called in to help manage traffic in Madras along US 26 and US 97 . Madras Municipal Airport received more than 400 mostly personal planes that queued for hours while waiting to leave after the eclipse . </P> <P> Officials in Idaho, where the totality path crossed the center of the state, began planning for the eclipse a year in advance . The state Transportation Department suspended construction projects along Interstate 15, which traverses Eastern Idaho, from August 18--22 in order to have all lanes open; their counterparts in neighboring Utah, where many were expected to travel the 220 miles (350 km) north via the highway from the Salt Lake City metropolitan area, did the same . On the morning of the eclipse, many drivers left before dawn, creating traffic volume along I - 15 normally not seen until morning rush hour; northbound traffic on the interstate in Box Elder County north of Salt Lake City slowed to 10--15 miles per hour (16--24 km / h). The Idaho State Police (ISP) stationed a patrol car along I - 15 every 15 miles (24 km) between Shelley and the Utah border . </P> <P> After the eclipse, traffic more than doubled along I - 15 southbound, with extensive traffic jams continuing for eight hours as viewers who had traveled north into the totality path from Utah returned there and to points south . The ISP tweeted a picture of bumper - to - bumper traffic stalled on the interstate just south of Idaho Falls . Motorists reported to local news outlets that it was taking them two hours to travel the 47 miles (76 km) from that city to Pocatello to the south, a journey that normally takes 45 minutes . Others reported that it took three hours to travel from Idaho Falls to the closer city of Blackfoot, 30 miles (48 km) farther north of Pocatello . </P> <P> In the rest of the state the impact was less severe . Traffic nearly doubled on US 93, and was up 55 percent on US 20 . </P>

When does the eclipse occur on the east coast