605 ILCS 5/9-109

It is unlawful to construct any bridge or culvert upon any ravine, creek, drainage ditch or river upon a public highway in this State unless such bridge or culvert shall have the capacity of sustaining highway traffic with safety.

Any person who violates the provisions of this Section shall be guilty of a petty offense.

The fact that any such bridge or culvert does not conform with the specifications of the Department in effect at the time when the contract for such bridge or culvert is let, is prima facie evidence that the bridge or culvert does not have the capacity of sustaining highway traffic with safety.