ELBA, Minn. — To avoid too much traffic on the County Road 37 backway between Elba and St. Charles, authorities have barricaded the road. The concern is that motorists might choose County Road 37 as an “unofficial detour” during bridge work on the main Elba-St. Charles highway. That would result in more wear and tear than 37 was built to handle, said county highway maintenance supervisor Tony Hohensee. The bridge project will continue into July. There are posted detours around the bridge project — but not the vulnerable 37.