Canada still owns both the Tunnel and the Blue Water Bridge.

Detroit and Windsor own the Tunnel - Detroit owns the U.S. side of the tunnel and Windsor the Canadian side. Syncora won a long-term lease to operate the tunnel during Detroit's bankruptcy. - Free Press

Blue Water Bridge:

The state of Michigan owns the U.S. portions of the spans, while a Canadian authority owns the Canadian section, according to the Michigan Department of Transportation - Detroit News

The Blue Water Bridges are jointly owned and maintained by Canada and the United States: Federal Bridge Corporation, a Crown corporation of the Government of Canada, is in charge of the Canadian side, while the Michigan Department of Transportation [[MDOT) is in charge of the US side. - Wikipedia

The Federal Bridge Corporation is a Crown Corporation owned by Canada and controlled by the Minister of Transport.