An act of god is an inevitable, unpredictable, and unreasonably severe event caused by natural forces without any human interference, and over which an insured party has no control, such as an earthquake, flood, hurricane, lightning, snowstorm. Acts of God are insurable accidents and valid excuses for non-performance of a contract.
The reeve of the RM of Clayton, Duane Hicks is obviously not an attorney and obviously confused.
On the one hand, he claims that it was an act of god, which if true would take the Contractor off the hook. The next minute, he claims that the bridge is under warranty and the Contractor will repair/replace at no cost to the community. Both of these statements can't be true.
An attorney would probably advise him to stop speaking about the Contract.
The final outcome of this incident will depend on whatever is in the Contract. Based on the comments made so far by the reeve, one would not have much confidence in his ability to prepare a proper construction contract.