Minneapolis Mayor R.T. Rybak says it's unclear when two bridges across the Mississippi will be reopened. The 10th Avenue and the Stone Arch bridges have been closed since Wednesday evening's collapse of the nearby 35W bridge. Both spans are within the investigation perimeter set up by law enforcement officials. Rybak said the downriver 10th Avenue bridge will need to stay off limits while the recovery efforts continue. But he says he would like see access restored to the Stone Arch bridge as early as next week.