The contractor hired to rehabilitate a century-old bridge in Kingston, Ont., that was demolished after a failed repair job is suing the federal government and an engineering firm that investigated the incident for more than $8 million.

But the contractor, Landform Civil Infrastructures Inc. (LCI), is itself the target of several lawsuits as the parties involved in the project try to recoup costs and point fingers over who's to blame.

The company alleges the government is withholding payment and "im…