セントクレア川
Marysville is home to a U.S. Customs and Border Protection station, established in 1960. The station, originally located in Port Huron, was moved south to River Road in Marysville, along the St. Clair River. In October 2007 a new facility opened at 2600 Wills St. The Marysville station is responsible for the United States-Canada border from Lake St. Clair, the St. Clair River and southern Lake Huron up into Michigan's Thumb. This territory includes the nearby international Blue Water Bridge crossing and St. Clair Tunnel.