A semi trailer overturned in St Paul late this morning, spilling scrap metal and forcing lane closures. It happened as the truck was making an exit from the Lafayette bridge onto westbound Interstate 94. The accident prompted the closing of the northbound US 52 ramp onto westbound 94 while the site is cleaned up. In addition, traffic on westbound 94 was reduced to one lane. The accident occurred around 10:40 this morning and the Minnesota State Patrol anticipated the closings would be in effect for several hours. At least one person was injured in the crash.