Engineers with the Missouri Department of Transportation admit it’s impossible to know, but they say they are trying to insure bridges in the state could withstand an earthquake. Highway officials and researchers have broached the subject during the National Earthquake Conference being held in downtown St. Louis. Scientists say there’s at least a 1-in-10 chance a strong earthquake will hit southeast Missouri in the next 50 years. MoDOT officials say they are well aware of the predictions. A MoDOT spokesman says it’s impossible to know if bridges in the region can survive a major earthquake, adding bridges can’t be made earthquake-proof, they can just be made to withstand some of the effects.